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