DS1318 Datasheet PDF | Maxim Integrated

Maxim Integrated DS1318

The DS1318 parallel-interface elapsed time counter (ETC) is a 44-bit counter that maintains the amount of time that the device operates from main and/or backup power or during an external event. The internal frequency of the counter clock is 4.096kHz, which provides a 244µs resolution and a maximum count of over 136 years. The DS1318 is accessed through a bytewide parallel interface, and operates over the industrial temperature range.

Part No.	DS1318
Datasheet	DS1318 Download
Manufacturer	Maxim Integrated
Description	Parallel-Interface Elapsed Time Counter
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GENERAL DESCRIPTION

A built-in power-sense circuit detects power failures, automatically switches to the backup supply, and controls the timer. If an external event timer is desired, the control input EXT can control the counter operation. An open-drain output provides an interrupt, and a square-wave output provides a programmable square wave. Power Meters Industrial Controls Servers

APPLICATIONS

Typical Operating Circuit VCC RPU VCC SQW IRQ WE EXT OE CPU CE DS1318 VBAT A3–A0 X1 DQ–DQ7 GND X2 - 0.1μF EXTERNAL COUNTER ENABLE (EVENT TIMER)

FEATURES

♦ Byte-Wide Parallel Interface ♦ 44-Bit Binary Counter Provides Timer with 244µs Resolution ♦ Automatic Power-Fail Detect and Switch Circuitry Selects Power Source from the Primary Power and the Battery, and Write Protects the Internal Registers ♦ Internal Power-Fail Circuit Allows Timer to Provide Primary or Battery Operation Times ♦ Timer can Alternately Provide an Event Timer of Either an Active-High or Active-Low Pulse ♦ Interrupt Output G...