DS1644 - Nonvolatile Timekeeping RAM

Maxim Integrated

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Datasheet Details

Part number	DS1644
Manufacturer	Maxim Integrated
File Size	209.95 KB
Description	Nonvolatile Timekeeping RAM
Datasheet	DS1644-MaximIntegrated.pdf

DS1644 Product details

Description

PIN PDIP PowerCap NAME 1 32 A14 2 30 A12 3 25 A7 4 24 A6 5 23 A5 6 22 A4 7 21 A3 8 20 A2 9 19 A1 10 18 A0 11 16 DQ0 12 15 DQ1 13 14 DQ2 14 17 GND 15 13 DQ3 16 12 DQ4 17 11 DQ5 18 10 DQ6 19 9 DQ7 20 8 CE 21 28 A10 22 7 OE 23 29 A11 24 27 A9 25 26 A8 26 31 27 6 A13 WE 28 5 -4 VCC RST - 1-3,33,34 NC - X1, X2, VBAT Address Input FUNCTION Data Input/Output Ground Data Input/Output Active Low Chip-Enable Input Address Input Active Low Outp

Features

Integrated NV SRAM, Real-Time Clock, Crystal, Power-Fail Control Circuit and Lithium Energy Source.
Clock Registers are Accessed Identically to the Static RAM. These Registers are Resident in the Eight Top RAM Locations.
Totally Nonvolatile with Over 10 Years of Operation in the Absence of Power.
BCD-Coded Year, Month, Date, Day, Hours, Minutes, and Seconds with Leap Year Compensation Valid Up to 2100.
Power-Fail Write Protection Allows for ±10% VCC Power Supply Tolera.

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Published: Mar 27, 2020 |