DS1386 View Datasheet(PDF) - Dallas Semiconductor -> Maxim Integrated

Part Name

Description

Manufacturer

DS1386

RAMified Watchdog Timekeeper

Dallas Semiconductor -> Maxim Integrated 

ORDERING INFORMATION

DS1386

XX-120

32-pin DIP Module

DS1386/DS1386P

*DS1386P

XX-120

08

8k x 8 NV SRAM

32

32k x 8 NV SRAM

34-pin PowerCap® Module Board

08

8k x 8 NV SRAM

32

32k x 8 NV SRAM

*DS9034PCX PowerCap required

(must be ordered separately)

PIN DESCRIPTION

INTA

- Interrupt Output A (open drain)

INTB (INTB) - Interrupt Output B (open drain)

A0-A14

- Address Inputs

DQ0-DQ7 - Data Input/Output

CE

- Chip Enable

OE

- Output Enable

WE

VCC

GND

SQW

NC

X1, X2

VBAT

- Write Enable

- +5V

- Ground

- Square Wave Output

- No Connection

- Crystal Connection

- Battery Connection

DESCRIPTION

The DS1386 is a nonvolatile static RAM with a full-function Real Time Clock (RTC), alarm, watchdog

timer, and interval timer which are all accessible in a byte-wide format. The DS1386 contains a lithium

energy source and a quartz crystal, which eliminates the need for any external circuitry. Data contained

within 8k or 32k by 8-bit memory and the timekeeping registers can be read or written in the same

manner as bytewide static RAM. The timekeeping registers are located in the first 14 bytes of memory

space. Data is maintained in the RAMified Timekeeper by intelligent control circuitry, which detects the

status of VCC and write protects memory when VCC is out of tolerance. The lithium energy source can

maintain data and real time for over ten years in the absence of VCC. Timekeeper information includes

hundredths of seconds, seconds, minutes, hours, day, date, month, and year. The date at the end of the

month is automatically adjusted for months with less than 31 days, including correction for leap year.

The RAMified Timekeeper operates in either 24-hour or 12-hour format with an AM/PM indicator. The

watchdog timer provides alarm interrupts and interval timing between 0.01seconds and 99.99 seconds.

The real time alarm provides for preset times of up to one week. Interrupts for both watchdog and RTC

will operate when system is powered down. Either can provide system “wake-up” signals.

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