DS1554 Datasheet (Dallas Semiconducotr) - 256K NV Y2KC Timekeeping RAM

DS1554, 256K NV Y2KC Timekeeping RAM

A0 *A14 - Address Inputs DQ0 *DQ7 IRQ/FT RST - Data Input/Outputs - Interrupt, Frequency Test Output (Open Drain) - Power-On Reset Output (Open Drain) CE - Chip Enable OE - Output Enable WE - Write Enable VCC - Power-Supply Input GND - Ground N.C.

- No Connection X1, X2

DS1554 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