The M48T08/18/08Y TIMEKEEPER® RAM is an 8 K x 8 non-volatile static RAM and real-time clock that is pin and function compatible with the DS1643.

This monolithic chip is offered in two specialized packages, delivering a highly integrated solution for battery-backed memory and real-time clock functionality.

The M48T08/18/08Y serves as a non-volatile equivalent in pin and function to any JEDEC standard 8 K x 8 SRAM.

It seamlessly fits into various ROM, EPROM, and EEPROM sockets, offering the non-volatility of PROMs without necessitating special WRITE timing or imposing limitations on the number of WRITEs that can be executed.

The 28-pin, 600 mil DIP CAPHAT encapsulates the M48T08/18/08Y silicon along with a quartz crystal and a long-lasting lithium button cell within a single package.

The 28-pin, 330 mil SOIC features sockets with gold-plated contacts at both ends, allowing for direct connection to a separate SNAPHAT® housing that contains the battery and crystal.

This innovative design permits the SNAPHAT® battery package to be mounted atop the SOIC package following the completion of the surface mount process.

Inserting the SNAPHAT® housing after reflow mitigates the risk of potential damage to the battery and crystal due to the elevated temperatures required for surface-mounting the device.

The SNAPHAT® housing is designed with a key to prevent reverse insertion.

The SOIC and battery/crystal packages are supplied separately in plastic anti-static tubes or in tape & reel format.

For the 28-lead SOIC, the part number for the battery/crystal package (e.g., SNAPHAT®) is “M4T28-BR12SH” or “M4T32-BR12SH.”

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Features:

• Guaranteed Zero Reading for 0V Input on All Scales
• True Polarity at Zero for Precise Null Detection
• 1pA Typical Input Current
• True Differential Input and Reference, Direct Display Drive- LCD ICL7106, LED lCL7107
• Low Noise – Less Than 15μVP-P
• On Chip Clock and Reference
• Low Power Dissipation – Typically Less Than 10mW
• No Additional Active Circuits Required
• Enhanced Display Stability
• Pb-Free Plus Anneal Available (RoHS Compliant.

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SAR ADC

• 12-Bit (C8051F020/1)
• 10-Bit (C8051F022/3)
• ± 1 LSB INL
• Programmable Throughput reaching up to 100 ksps
• Supports up to 8 External Inputs; Configurable as Single-Ended or Differential
• Programmable Amplifier Gain options: 16, 8, 4, 2, 1, 0.5
• Data-Dependent Windowed Interrupt Generator
• Integrated Temperature Sensor (± 3°C) – 8-bit ADC
• Programmable Throughput reaching up to 500 ksps
• 8 External Inputs
• Programmable Amplifier Gain options: 4, 2, 1, 0.5 – Two 12-bit DACs
• Capable of Synchronizing Outputs to Timers for Jitter-Free Waveform Generation – Two Analog Comparators – Voltage Reference – Precision VDD Monitor/Brown-Out Detector

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The AT89C2051 is a high-performance, low-voltage CMOS 8-bit microcomputer featuring 2K bytes of Flash programmable and erasable read-only memory (PEROM). This device is produced using Atmel’s advanced nonvolatile memory technology and is compatible with the widely-used MCS-51 instruction set. By integrating a flexible 8-bit CPU with Flash memory on a single chip, the Atmel AT89C2051 offers a robust microcomputer that delivers a highly adaptable and economical solution for numerous embedded control applications.

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Analog Peripherals – 24 or 16-Bit ADC

• No missing codes
• 0.0015% nonlinearity
• Programmable conversion rates up to 1 ksps
• 8-Input multiplexer
• 1x to 128x PGA
• Built-in temperature sensor
  – Two 8-Bit Current Output DACs
  – Comparator
• Programmable hysteresis and response time
• Configurable as interrupt or reset source
• Low current (0.4 µA)

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• Analog Peripherals – 10 or 12-bit SAR ADC
• ± 1 LSB INL
• Programmable throughput reaching up to 100 ksps
• Supports up to 8 external inputs, configurable as single-ended or differential
• Programmable amplifier gain options: 16, 8, 4, 2, 1, 0.5
• Data-dependent windowed interrupt generator
• Integrated temperature sensor

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The DS1220Y 16k Nonvolatile SRAM is a fully static, nonvolatile RAM with a capacity of 16,384 bits, organized into 2048 words of 8 bits each.

Each NV SRAM features a self-contained lithium energy source along with control circuitry that continuously monitors VCC for any out-of-tolerance conditions. In the event of such a condition, the lithium energy source is automatically activated, and write protection is unconditionally enabled to safeguard against data corruption.

This NV SRAM can directly replace existing 2k x 8 SRAMs that conform to the widely used bytewide 24-pin DIP standard. Additionally, the DS1220Y is compatible with the pinout of the 2716 EPROM or the 2816 EEPROM, facilitating direct substitution while improving performance.

There are no restrictions on the number of write cycles that can be performed, and no extra support circuitry is necessary for interfacing with microprocessors.

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Peripheral Features:

• High current sink/source I/O pins: 25 mA/25 mA
• Three 16-bit timers/counters; optionally pair up 16-bit timers into 32-bit timer modules
• Four 16-bit capture input functions
• Two 16-bit compare/PWM output functions – Dual Compare mode available
• 3-wire SPI modules (supports 4 Frame modes)
• I2CTM module supports Multi-Master/Slave mode and 7-bit/10-bit addressing
• Addressable UART modules with FIFO buffers.

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Peripheral Features:

• High-current sink/source I/O pins: 25 mA/25 mA
• Timer module with programmable prescaler: – Five 16-bit timers/counters; optionally pair 16-bit timers into 32-bit timer modules
• 16-bit Capture input functions
• 16-bit Compare/PWM output functions
• 3-wire SPI modules (supports 4 Frame modes)
• I2CTM module supports Multi-Master/Slave mode and 7-bit/10-bit addressing
• Two UART modules with FIFO Buffers
• Two CAN modules, 2.0B compliant (dsPIC306010A)
• One CAN module, 2.0B compliant (dsPIC306015).

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Peripheral Features:

• High-current sink/source I/O pins: 25 mA/25 mA
• Timer module with programmable prescaler: – Five 16-bit timers/counters; optionally pair 16-bit timers into 32-bit timer modules
• 16-bit Capture input functions
• 16-bit Compare/PWM output functions
• 3-wire SPI modules (supports 4 Frame modes)
• I2C module supports Multi-Master/Slave mode and 7-bit/10-bit addressing
• 2 UART modules with FIFO Buffers
• 1 CAN module, 2.0B compliant.

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