M48T08 Datasheet, PDF (1/27 Pages) STMicroelectronics – CMOS 8K x 8 TIMEKEEPER SRAM

M48T08
M48T08Y, M48T18
5V, 64 Kbit (8 Kb x8) TIMEKEEPER^® SRAM
FEATURES SUMMARY
■ INTEGRATED ULTRA LOW POWER SRAM,
REAL TIME CLOCK, POWER-FAIL
CONTROL CIRCUIT, AND BATTERY
■ BYTEWIDE™ RAM-LIKE CLOCK ACCESS
■ BCD CODED YEAR, MONTH, DAY, DATE,
HOURS, MINUTES, and SECONDS
■ TYPICAL CLOCK ACCURACY OF ±1
MINUTE A MONTH, AT 25°C
■ AUTOMATIC POWER-FAIL CHIP
DESELECT AND WRITE PROTECTION
■ WRITE PROTECT VOLTAGES
(V_PFD = Power-fail Deselect Voltage):
– M48T08: V_CC = 4.75 to 5.5V
4.5V ≤ V_PFD ≤ 4.75V
– M48T18/T08Y: V_CC = 4.5 to 5.5V
4.2V ≤ V_PFD ≤ 4.5V
■ SOFTWARE CONTROLLED CLOCK
CALIBRATION FOR HIGH ACCURACY
APPLICATIONS
■ SELF-CONTAINED BATTERY AND
CRYSTAL IN THE CAPHAT™ DIP
PACKAGE
■ PACKAGING INCLUDES A 28-LEAD SOIC
AND SNAPHAT^® TOP (to be ordered
separately)
■ SOIC PACKAGE PROVIDES DIRECT
CONNECTION FOR A SNAPHAT TOP
WHICH CONTAINS THE BATTERY AND
CRYSTAL
■ PIN AND FUNCTION COMPATIBLE WITH
DS1643 and JEDEC STANDARD 8K x8
SRAMs
■ RoHS COMPLIANCE
Lead-free components are compliant with the
RoHS Directive.
Figure 1. 28-pin PCDIP, CAPHAT™ Package
28
1
PCDIP28 (PC)
Battery/Crystal
CAPHAT
Figure 2. 28-pin SOIC Package
SNAPHAT (SH)
Battery/Crystal
28
1
SOH28 (MH)
December 2005
Rev 7.0
1/27