M48T129Y_10 Datasheet, PDF (1/28 Pages) STMicroelectronics – 5.0 or 3.3 V, 1 Mbit (128 Kbit x 8) TIMEKEEPER® SRAM

M48T129Y
M48T129V
5.0 or 3.3 V, 1 Mbit (128 Kbit x 8) TIMEKEEPER^® SRAM
Features
■ Integrated, ultra low power SRAM, real-time
clock, power-fail control circuit, battery, and
crystal
■ BCD coded century, year, month, day, date,
hours, minutes, and seconds
■ Battery low warning flag
■ Automatic power-fail chip deselect and WRITE
protection
■ Two WRITE protect voltages:
(V_PFD = power-fail deselect voltage)
– M48T129Y: V_CC = 4.5 to 5.5 V
4.2 V ≤ V_PFD ≤ 4.5 V
– M48T129V: V_CC = 3.0 to 3.6 V
2.7 V ≤ V_PFD ≤ 3.0 V
■ 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 DIP
package
■ Microprocessor power-on reset
(valid even during battery backup mode)
■ Programmable alarm output active in battery
backup mode
■ RoHS compliant
– Lead-free second level interconnect
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PMDIP32 module (PM)
June 2010
Doc ID 5710 Rev 4
1/28
www.st.com
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