DS1556 Datasheet - Dallas Semiconducotr

DS1556 Y2K-Compliant Timekeeping RAM

A0 *A16 - Address Input DQ0 *DQ7 IRQ/FT RST CE OE WE - Data Input/Outputs - Interrupt, Frequency Test Output (Open Drain) - Power-On Reset Output (Open Drain) - Chip Enable - Output Enable - Write Enable VCC - Power Supply Input GND - Ground N.C. - No Connection X1, X2 VBAT .

DS1556 Features

* Integrated NV SRAM, Real-Time Clock (RTC), Crystal, Power-Fail Control Circuit, and Lithium Energy Source

* Clock Registers are Accessed Identically to the Static RAM; These Registers Reside in the 16 Top RAM Locations

* Century Byte Register (i.e., Y2K Compliant)

* Totally Nonvola

DS1556_DallasSemiconducotr.pdf