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. 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. The DS1318 is accessed through a byte-wide parallel interface, and operates over the industrial temperature range.
Key Features
Applications/Uses
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 Generated Periodically or When the Upper 32 Bits of the Counter Match an Alarm Register
Square-Wave Output with 16 Selectable Frequencies from 32.768kHz to 0.5Hz
* Some packages have variations, listed on the drawing. "PkgCode/Variation" tells which variation the product uses. Note that "+", "#", "-" in the part number suffix describes RoHS status. Package drawings may show a different suffix character.
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DS1318
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TYPE PINS FOOTPRINT
DRAWING CODE/VAR *
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RoHS/Lead-Free? Materials Analysis
DS1318E+
Active
TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24+2*
-40°C to +85°C
See data sheet
DS1318
Active
TSSOP;24 pin;52 mm²
Outline Drawing: 21-0066 (PDF)
Land Pattern: 90-0118 (PDF)
Use pkgcode/variation: U24-2*
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