The MAX6314 low-power CMOS microprocessor (µP) supervisory circuit is designed to monitor power supplies in µP and digital systems. The MAX6314's active-low RESET output is bidirectional, allowing it to be directly connected to µPs with bidirectional reset inputs, such as the 68HC11. It provides excellent circuit reliability and low cost by eliminating external components and adjustments. The MAX6314 also provides a debounced manual reset input.This device performs a single function: it asserts a reset signal whenever the VCC supply voltage falls below a preset threshold or whenever manual reset is asserted. Reset remains asserted for an internally programmed interval (reset timeout period) after VCC has risen above the reset threshold or manual reset is deasserted.The MAX6314 comes with factory-trimmed reset threshold voltages in 100mV increments from 2.5V to 5V. Preset timeout periods of 1ms, 20ms, 140ms, and 1120ms (minimum) are also available. The device comes in a SOT143 package.For a µP supervisor with an open-drain reset pin, see the MAX6315 data sheet.ApplicationsComputers: Desktop, Workstation, ServerControllersCritical µP and µC Power MonitoringIntelligent InstrumentsPortable Battery-Powered Equipment

The MAX5949A/MAX5949B are hot-swap controllers that allow a circuit card to be safely hot plugged into a live backplane. The MAX5949A/MAX5949B operate from -20V to -80V and are well-suited for -48V power systems. These devices are pin and function compatible with the LT4250 and pin compatible with the LT1640.The MAX5949A/MAX5949B provide a controlled turn-on to circuit cards preventing glitches on the power-supply rail and damage to board connectors and components. The MAX5949A/MAX5949B provide undervoltage, overvoltage, and overcurrent protection. These devices ensure the input voltage is stable and within tolerance before applying power to the load.Both the MAX5949A and MAX5949B protect a system against overcurrent and short-circuit conditions by turning off the external MOSFET in the event of a fault condition. The MAX5949A/MAX5949B also provide protection against input voltage steps. During an input voltage step, the MAX5949A/MAX5949B limit the current drawn by the load to a safe level without turning off power to the load.Both devices feature an open-drain power-good status output (PWRGD-bar for the MAX5949A or PWRGD for the MAX5949B) that can be used to enable downstream converters.The MAX5949A/MAX5949B are available in an 8-pin SO package. Both devices are specified for the extended -40°C to +85°C temperature range.Applications-48V Distributed Power SystemsBase-Station Line CardsCentral-Office Line CardsCentral-Office SwitchingNegative Power-Supply ControlsNetwork Routers and SwitchesServer Line CardsTelecom Line Cards

The MAX6173–MAX6177 are low-noise, high-precision voltage references. The devices feature a proprietary temperature-coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/°C temperature coefficient and excellent ±0.06% initial accuracy. The MAX6173–MAX6177 provide a TEMP output where the output voltage is proportional to the die temperature, making the devices suitable for a wide variety of temperature-sensing applications. The devices also provide a TRIM input, allowing fine trimming of the output voltage with a resistive divider network. Low temperature drift and low noise make the devices ideal for use with high-resolution A/D or D/A converters.The MAX6173–MAX6177 provide accurate preset +2.5V, +3.3V, +4.096V, +5.0V, and +10V reference voltages and accept input voltages up to +40V. The devices draw 320µA (typ) of supply current and source 30mA or sink 2mA of load current. The MAX6173–MAX6177 use bandgap technology for low-noise performance and excellent accuracy. The MAX6173–MAX6177 do not require an output bypass capacitor for stability, and are stable with capacitive loads up to 100µF. Eliminating the output bypass capacitor saves valuable board area in space-critical applications.The MAX6173–MAX6177 are available in an 8-pin SO package and operate over the automotive (-40°C to +125°C) temperature range.ApplicationsADCsAutomotiveDACsDigital VoltmetersThreshold DetectorsVoltage Regulators

The MAX6173–MAX6177 are low-noise, high-precision voltage references. The devices feature a proprietary temperature-coefficient curvature-correction circuit and laser-trimmed thin-film resistors that result in a very low 3ppm/°C temperature coefficient and excellent ±0.06% initial accuracy. The MAX6173–MAX6177 provide a TEMP output where the output voltage is proportional to the die temperature, making the devices suitable for a wide variety of temperature-sensing applications. The devices also provide a TRIM input, allowing fine trimming of the output voltage with a resistive divider network. Low temperature drift and low noise make the devices ideal for use with high-resolution A/D or D/A converters.The MAX6173–MAX6177 provide accurate preset +2.5V, +3.3V, +4.096V, +5.0V, and +10V reference voltages and accept input voltages up to +40V. The devices draw 320µA (typ) of supply current and source 30mA or sink 2mA of load current. The MAX6173–MAX6177 use bandgap technology for low-noise performance and excellent accuracy. The MAX6173–MAX6177 do not require an output bypass capacitor for stability, and are stable with capacitive loads up to 100µF. Eliminating the output bypass capacitor saves valuable board area in space-critical applications.The MAX6173–MAX6177 are available in an 8-pin SO package and operate over the automotive (-40°C to +125°C) temperature range.ApplicationsADCsAutomotiveDACsDigital VoltmetersThreshold DetectorsVoltage Regulators

The MAX6887/MAX6888 multivoltage supply supervisors provide several voltage-detector inputs, one watchdog input, and three outputs. Each voltage-detectorinput offers a factory-set undervoltage and overvoltage threshold. Manual reset and margin disable inputs offer additional flexibility.The MAX6887 offers six voltage-detector inputs, while the MAX6888 offers four inputs. Output active-low RESET asserts when any input voltage drops below its respective undervoltage threshold or manual reset active-low MR is asserted. Output active-low OV asserts when any input voltage exceeds its respective overvoltage threshold. Monitor standard supply voltages listed in the Selector Guide in the full datasheet.The MAX6887/MAX6888 offer a watchdog timer with an initial and normal timeout periods of 102.4s and 1.6s, respectively. Watchdog output active-low WDO asserts when the watchdog timer expires. Connect active-low WDO to manual reset input active-low MR to generate resets when the watchdog timer expires. RESET, OV, and WDO are active-low, open-drain outputs.The MAX6887/MAX6888 are available in a 5mm x 5mm x 0.8mm, 16-pin thin QFN package and operate over the extended -40°C to +85°C temperature range.ApplicationsMultivoltage SystemsNetworkingServers/Workstations/Storage SystemsTelecom

The MAX6966/MAX6967 serial-interfaced peripheralsprovide microprocessors with 10 I/O ports rated to 7V.Each port can be individually configured as either: A 20mA constant-current LED driver (static or pulsewidthmodulated (PWM)). A 10mA constant-current LED driver (static or PWM). An open-drain logic output. An overvoltage-protected Schmitt logic input.Analog and switching LED intensity control is built in: Individual 8-bit PWM control per output. Individual 1-bit analog control (half/full) per output. Global 3-bit analog control applies to all LED outputs.PWM timing of the 10 port outputs may be optionallystaggered, consecutively phased in 45° increments.This spreads the PWM load currents over time in eightsteps, helping to even out the power-supply currentand reduce the RMS current.The MAX6966/MAX6967 can be configured to awakefrom shutdown on receipt of a minimum 3ms pulse onthe active-low CS input. This hardware-wakeup feature allows apower-management controller or similar ASIC to enablethe MAX6966/MAX6967 with preconfigured LED intensitysettings.Shutdown can be programmed to wait up to 4s, fadedown the sink currents to zero for a period of 1/16s to4s, and then shut down. A similar ramp-up from shutdowncan be programmed for 1/16s to 4s.The MAX6966/MAX6967 support hot insertion. All portpins remain high impedance in power-down (V+ = 0V)with up to 8V asserted on them.The DOUT/OSC pin can be configured as either theserial interface data output or optional PWM clockinput. The MAX6966 powers up defaulting as DOUToutput. The MAX6967 defaults as OSC input.For a similar part without the constant-current controls,refer to the MAX7317 data sheet.ApplicationsCell PhonesKeypad BacklightsLCD BacklightsLED Status IndicationPortable EquipmentRGB LED Drivers

The MAX6971 serial-interfaced LED driver provides 16 open-drain, constant-current-sinking LED driver outputs rated at 36V. The MAX6971 operates from a 3V to 5.5V supply. The MAX6971 supply and the LEDs' supply or supplies can power up in any order. The constant-current outputs are programmed together to up to 55mA using a single external resistor. The MAX6971 operates with a 25Mb, industry-standard, 4-wire serial interface.The MAX6971 uses the industry-standard, shift-register-plus-latch-type serial interface. The driver accepts data shifted into a 16-bit shift register using data input DIN and clock input CLK. Input data appears at the DOUT output 16 clock cycles later to allow cascading of multiple MAX6971s. The latch-enable input, LE, loads the 16 bits of shift register data into a 16-bit output latch to set which LEDs are on and which are off. The active-low output-enable, OE, gates all 16 outputs on and off, and is fast enough to be used as a PWM input for LED intensity control.For applications requiring LED fault detection, refer to the MAX6983, which automatically detects open-circuit LEDs.For safety-related applications requiring a watchdog timer, refer to the MAX6983, which includes a fail-safe feature that blanks the display if the serial interface becomes inactive for more than 1s.The MAX6971 is one of a family of 12 shift-register-plus-latch-type LED drivers. The family includes 8-port and 16-port types, with 5.5V- or 36V-rated LED outputs, with and without open-circuit LED detection and watchdog. All versions operate from a 3V to 5.5V supply, and are specified over the -40°C to +125°C temperature range.ApplicationsArchitectural LightingGaming FeaturesMarquee DisplaysPoint-of-Order SignsTraffic SignsVariable Message Signs

The MAX6979 serial-interfaced LED driver provides 16open-drain, constant-current-sinking LED driver outputsrated at 5.5V. The MAX6979 operates from a 3V to 5.5Vsupply. The MAX6979 supply and the LEDs' supply canpower up in any order. The constant-current outputsare programmed together to up to 55mA using a singleexternal resistor. The MAX6979 operates with a 25Mb,industry-standard, 4-wire serial interface.The MAX6979 includes circuitry that automaticallydetects open-circuit LEDs. Fault status is loaded into theserial-interface shift register when LE goes high and isautomatically shifted out on DOUT when the next datatransmission is shifted in.The MAX6979 includes a fail-safe feature for safety-relatedapplications, which blanks the display if the serialinterface fails. If the serial interface becomesinactive for more than 1s, all driver output latches areautomatically cleared. This turns off all LEDs connectedto the outputs. The shift register data is not disturbed.The outputs remain off until the driver output latches areupdated with data turning them on, so recovery is automaticif the transmission failure is temporary. Thewatchdog function requires no software change to theapplication driving the MAX6979.The MAX6979 uses the industry-standard shift-register-plus-latch-type serial interface. The driver accepts datashifted into a 16-bit shift register using data input DINand clock input CLK. Input data appears at the outputDOUT 16 clock cycles later to allow cascading of multipleMAX6979s. The latch-enable input, LE, loads the 16bits of shift-register data into a 16-bit output latch to setwhich LEDs are on and which are off. The output-enableinput, OE-bar, gates all 16 outputs on and off, and isfast enough to be used as a PWM input for LED intensitycontrol.The MAX6979 is one of a family of 12 shift-register-plus-latch-type LED drivers. The family includes 8-port and16-port types, with 5.5V- or 36V-rated LED outputs, withand without open-circuit LED detection and watchdog.All versions operate from a 3V to 5.5V supply, and arespecified over the -40°C to +125°C temperature range.ApplicationsArchitectural LightingGaming FeaturesMarquee DisplaysPoint-of-Order SignsTraffic SignsVariable Message Signs

The MAX7321 2-wire serial-interfaced peripheral features eight open-drain I/O ports with selectable internal pullups and transition detection. Any port may be used as a logic input or an open-drain output. Ports are overvoltage protected to +6V independent of supply voltage.All I/O ports configured as inputs are continuously monitored for state changes (transition detection). State changes are indicated by the open-drain, active-low INT output. The interrupt is latched, allowing detection of transient changes. When the MAX7321 is subsequently accessed through the serial interface, any pending interrupt is cleared.The open-drain outputs are rated to sink 20mA and are capable of driving LEDs.The +6V tolerant active-low RST input clears the serial interface, terminating any I2C communication to or from the MAX7321.The MAX7321 uses two address inputs with four-level logic to allow 16 I2C slave addresses. The slave address also determines the power-up logic state for the I/O ports, and enables or disables internal 40kΩ pullups in groups of four ports.The MAX7321 is one device in a family of pin-compatible port expanders with a choice of input ports, open-drain I/O ports, and push-pull output ports.The MAX7321 is available in 16-pin QSOP and TQFN packages, and is specified over the automotive temperature range (-40°C to +125°C).ApplicationsCell PhonesNotebooksSAN/NASSatellite RadioServers

The MAX9725A–MAX9725D fixed-gain, stereo headphone amplifiers are ideal for portable equipment where board space is at a premium. The MAX9725E offers the flexibility to adjust the gain with external input and feedback resistors. The MAX9725A–MAX9725E use a unique DirectDrive® architecture to produce a ground-referenced output from a single supply, eliminating the need for large DC-blocking capacitors, saving cost, board space, and component height. Fixed gains of -2V/V (MAX9725A), -1.5V/V (MAX9725B), -1V/V (MAX9725C), and -4V/V (MAX9725D) further reduce external component count. The adjustable gain of the MAX9725E DirectDrive headphone amplifier allows for any gain down to -1V/V using external resistors.The MAX9725 delivers up to 20mW per channel into a 32Ω load and achieves 0.006% THD+N. An 80dB at 1kHz power-supply rejection ratio (PSRR) allows the MAX9725 to operate from noisy digital supplies without an additional linear regulator. The MAX9725 includes ±8kV ESD protection on the headphone output. Comprehensive click-and-pop circuitry suppresses audible clicks and pops at startup and shutdown. A low-power shutdown mode reduces supply current to 0.6µA (typ).The MAX9725 operates from a single 0.9V to 1.8V supply, allowing the device to be powered directly from a single AA or AAA battery. The MAX9725 consumes only 2.1mA of supply current, provides short-circuit protection, and is specified over the extended -40°C to +85°C temperature range. The MAX9725 is available in a tiny (1.54mm x 2.02mm x 0.6mm) 12-bump chip-scale package (UCSP™) and a 12-pin thin QFN package (4mm x 4mm x 0.8mm).ApplicationsCell PhonesMP3 PlayersPDAsPortable Audio EquipmentSmartphones

The MAX9996 high-linearity downconversion mixer provides8.3dB gain, +26.5dBm IIP3, and 9.7dB NF for1700MHz to 2200MHz UMTS/W-CDMA, DCS, and PCSbase-station receiver applications. With a 1900MHz to2400MHz LO frequency range, this particular mixer isideal for high-side LO injection receiver architectures.Low-side LO injection is supported by the MAX9994,which is pin-for-pin and functionally compatible with theMAX9996.In addition to offering excellent linearity and noise performance,the MAX9996 also yields a high level of componentintegration. This device includes a double-balancedpassive mixer core, an IF amplifier, a dual-inputLO selectable switch, and an LO buffer. On-chipbaluns are also integrated to allow for single-ended RFand LO inputs. The MAX9996 requires a nominal LOdrive of 0dBm, and supply current is guaranteed to bebelow 240mA.The MAX9994/MAX9996 are pin compatible with theMAX9984/MAX9986 815MHz to 995MHz mixers, makingthis entire family of downconverters ideal for applicationswhere a common PC board layout is used forboth frequency bands. The MAX9996 is also functionallycompatible with the MAX9993.The MAX9996 is available in a compact, 20-pin, TQFN package (5mm x 5mm) with an exposed paddle.Electrical performance is guaranteed over the extended-40°C to +85°C temperature range.ApplicationscdmaOne™ and cdma2000® Base StationsDCS1800/PCS1900 EDGE Base StationsDigital and Spread-Spectrum Communication SystemsFixed Broadband Wireless AccessMicrowave LinksMilitary SystemsPHS/PAS Base Stations Predistortion ReceiversPrivate Mobile Radios (PMRs)UMTS/WCDMA Base StationsWireless Local Loop (WLL)

The DS1077L is a dual-output, programmable, fixed-frequency oscillator requiring no externalcomponents for operation. The DS1077L can be used as a processor-controlled frequency synthesizer oras a stand-alone oscillator. The two synchronous output operating frequencies are user-adjustable insubmultiples of the master frequency through the use of two on-chip programmable prescalers anddividers. The specific output frequencies chosen are stored in nonvolatile (EEPROM) memory. TheDS1077L defaults to these values upon power-up.The DS1077L features a 2-wire serial interface that allows in-circuit on-the-fly programming of theprogrammable prescalers (P0 & P1) and divider (N) with the desired values being stored in nonvolatile(EEPROM) memory. Design changes can be accommodated in-circuit, on-the-fly by simply programmingdifferent values into the device (or reprogramming previously programmed devices). Alternatively, forfixed-frequency applications previously programmed devices can be used and no connection to the serialinterface is required. Preprogrammed devices can be ordered in customer-requested frequencies.The DS1077L is available in SO or µSOP packages, allowing the generation of a clock signal easily,economically, and using minimal board area. Chip-scale packaging is also available on request.ApplicationsCable ModemsCell PhonesComputer PeripheralsCopiersPCsPrinters

The DS1077L is a dual-output, programmable, fixed-frequency oscillator requiring no externalcomponents for operation. The DS1077L can be used as a processor-controlled frequency synthesizer oras a stand-alone oscillator. The two synchronous output operating frequencies are user-adjustable insubmultiples of the master frequency through the use of two on-chip programmable prescalers anddividers. The specific output frequencies chosen are stored in nonvolatile (EEPROM) memory. TheDS1077L defaults to these values upon power-up.The DS1077L features a 2-wire serial interface that allows in-circuit on-the-fly programming of theprogrammable prescalers (P0 & P1) and divider (N) with the desired values being stored in nonvolatile(EEPROM) memory. Design changes can be accommodated in-circuit, on-the-fly by simply programmingdifferent values into the device (or reprogramming previously programmed devices). Alternatively, forfixed-frequency applications previously programmed devices can be used and no connection to the serialinterface is required. Preprogrammed devices can be ordered in customer-requested frequencies.The DS1077L is available in SO or µSOP packages, allowing the generation of a clock signal easily,economically, and using minimal board area. Chip-scale packaging is also available on request.ApplicationsCable ModemsCell PhonesComputer PeripheralsCopiersPCsPrinters

The DS1099 is a low-cost, low-power, low-frequency silicon oscillator that generates two square-wave outputs with frequencies between 0.25Hz and 1.048MHz. Individual output enables allow both outputs to be enabled/disabled independently. Both outputs are capable of sinking 16mA, allowing them to directly interface to light-emitting diodes (LEDs) as well as other external circuitry. The DS1099 operates over a wide supply voltage, making it suitable for both 3V and 5V systems. The device is shipped from the factory custom programmed and calibrated, ready to be inserted into the end application.Contact the factory for custom frequencies or requirements.ApplicationsConsumer AppliancesFlashing LED Status IndicatorsPrintersServersSwitch-Mode Power Supplies

The DS1220AB and DS1220AD 16k Nonvolatile (NV) SRAMs are 16,384-bit, fully static, NV SRAMs organized as 2048 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry that constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. The NV SRAMs can be used in place of existing 2k x 8 SRAMs directly conforming to the popular bytewide 24-pin DIP standard. The devices also match the pinout of the 2716 EPROM and the 2816 EEPROM, allowing direct substitution while enhancing performance. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.

The ADuM3223/ADuM4223 are 4 A isolated, half-bridge gatedrivers that employ the Analog Devices, Inc., iCoupler® technology to provide independent and isolated high-side and low-sideoutputs. The ADuM3223 provides 3000 V rms isolation in thenarrow body, 16-lead SOIC package, and the ADuM4223 provides 5000 V rms isolation in the wide body, 16-lead SOIC package.Combining high speed CMOS and monolithic transformer technology, these isolation components provide outstanding performance characteristics superior to the alternatives, such as the combination of pulse transformers and gate drivers. The ADuM3223/ADuM4223 isolators each provide two independent isolated channels. They operate with an inputsupply ranging from 3.0 V to 5.5 V, providing compatibility with lower voltage systems. In comparison to gate drivers employinghigh voltage level translation methodologies, the ADuM3223/ADuM4223 offer the benefit of true, galvanic isolation between the input and each output. Each output may be continuously operated up to 537 V peak relative to the input, thereby supporting low-side switching to negative voltages. The differential voltagebetween the high-side and low-side may be as high as 800 V peak.As a result, the ADuM3223/ADuM4223 provide reliable controlover the switching characteristics of IGBT/MOSFET configurations over a wide range of positive or negative switching voltages.Applications Switching power supplies Isolated IGBT/MOSFET gate drives Industrial inverters Automotive

The DS1308 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV RAM. Address and data are transferred serially through an I²C interface. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The end of the month date is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either the 24-hour or 12-hour format with an AM/PM indicator. The DS1308 has a built-in power-sense circuit that detects power failures and automatically switches to the backup supply, maintaining time and date operation.ApplicationsConsumer Electronics (Set-Top Box, Digital Recording, Network Appliance)Handhelds (GPS, POS Terminal)Medical (Glucometer, Medicine Dispenser)Office Equipment (Fax/Printer, Copier)Other (Utility Meter, Vending Machine, Thermostat, Modem)Telecommunications (Router, Switcher, Server)

The DS1343/DS1344 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, permitting longer life from a backup supply source. The devices also support high-ESR crystals, broadening the pool of usable crystals for the devices. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format with an active-low AM/PM indicator.Address and data are transferred serially through an SPI™ or 3-wire interface. Two programmable time-of-day alarms are provided. Each alarm can generate an interrupt on a combination of seconds, minutes, hours, and day. Don't-care states can be inserted into one or more fields if it is desired for them to be ignored for the alarm condition. The time-of-day alarms can be programmed to assert two different interrupt outputs, or they can be combined to assert one common interrupt output. Both interrupt outputs operate when the device is powered by either VCC or VBAT.The devices are available in a lead-free/RoHS-compliant, 20-pin TSSOP or 14-pin TDFN package, and support a -40°C to +85°C extended industrial temperature range.ApplicationsEmbedded TimestampingHandheld DevicesMedicalTelematics

The DS1343/DS1344 low-current real-time clocks (RTCs) are timekeeping devices that provide an extremely low standby current, permitting longer life from a backup supply source. The devices also support high-ESR crystals, broadening the pool of usable crystals for the devices. The clock/calendar provides seconds, minutes, hours, day, date, month, and year information. The date at the end of the month is automatically adjusted for months with fewer than 31 days, including corrections for leap year. The clock operates in either 24-hour or 12-hour format with an active-low AM/PM indicator.Address and data are transferred serially through an SPI™ or 3-wire interface. Two programmable time-of-day alarms are provided. Each alarm can generate an interrupt on a combination of seconds, minutes, hours, and day. Don't-care states can be inserted into one or more fields if it is desired for them to be ignored for the alarm condition. The time-of-day alarms can be programmed to assert two different interrupt outputs, or they can be combined to assert one common interrupt output. Both interrupt outputs operate when the device is powered by either VCC or VBAT.The devices are available in a lead-free/RoHS-compliant, 20-pin TSSOP or 14-pin TDFN package, and support a -40°C to +85°C extended industrial temperature range.ApplicationsEmbedded TimestampingHandheld DevicesMedicalTelematics

The DS1225AB and DS1225AD are 65,536-bit, fully static, nonvolatile (NV) SRAMs organized as 8192 words by 8 bits. Each NV SRAM has a self-contained lithium energy source and control circuitry which constantly monitors VCC for an out-of-tolerance condition. When such a condition occurs, the lithium energy source is automatically switched on and write protection is unconditionally enabled to prevent data corruption. The NV SRAMs can be used in place of existing 8k x 8 SRAMs directly conforming to the popular bytewide 28-pin DIP standard. The devices also match the pinout of the 2764 EPROM and the 2864 EEPROM, allowing direct substitution while enhancing performance. There is no limit on the number of write cycles that can be executed and no additional support circuitry is required for microprocessor interfacing.