M48T128Y Datasheet, PDF (1/22 Pages) STMicroelectronics – 3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM

M48T128Y
M48T128V*
5.0 or 3.3V, 1 Mbit (128 Kb x 8) TIMEKEEPER^® SRAM
FEATURES SUMMARY
■ INTEGRATED, ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL
CONTROL CIRCUIT, BATTERY, AND
CRYSTAL
■ BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES, AND SECONDS
■ AUTOMATIC POWER-FAIL CHIP
DESELECT AND WRITE PROTECTION
■ WRITE PROTECT VOLTAGES
(V_PFD = Power-fail Deselect Voltage):
– M48T128Y: V_CC = 4.5 to 5.5V
4.1V ≤ V_PFD ≤ 4.5V
– M48T128V*: V_CC = 3.0 to 3.6V
2.7V ≤ V_PFD ≤ 3.0V
■ CONVENTIONAL SRAM OPERATION;
UNLIMITED WRITE CYCLES
■ SOFTWARE CONTROLLED CLOCK
CALIBRATION FOR HIGH ACCURACY
APPLICATIONS
■ 10 YEARS OF DATA RETENTION AND
CLOCK OPERATION IN THE ABSENCE OF
POWER
■ SELF-CONTAINED BATTERY AND
CRYSTAL IN THE DIP PACKAGE
■ PIN AND FUNCTION COMPATIBLE WITH
JEDEC STANDARD 128K x 8 SRAMs
Figure 1. 32-pin PMDIP Module
32
1
PMDIP32 (PM)
Module
* Contact local ST sales office for availability of 3.3V version.
February 2005
1/22