M48T129Y datasheet(1/22 Pages) STMICROELECTRONICS

Part #	M48T129Y

Description	3.3V-5V 1 Mbit 128Kb x8 TIMEKEEPER SRAM

PDF	22 Pages

Scroll/Zoom	100%

Manufacturer	STMICROELECTRONICS [STMicroelectronics]

Direct Link	http://www.st.com

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April 2000

M48T129Y

M48T129V

3.3V-5V 1 Mbit (128Kb x8) TIMEKEEPER® SRAM

s

INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL CONTROL

CIRCUIT, BATTERY AND CRYSTAL

s

YEAR 2000 COMPLIANT

s

BCD CODED CENTURY, YEAR, MONTH,

DAY, DATE, HOURS, MINUTES, and

SECONDS

s

BATTERY LOW WARNING FLAG

s

AUTOMATIC POWER-FAIL CHIP DESELECT

and WRITE PROTECTION

s

TWO WRITE PROTECT VOLTAGES:

(VPFD = Power-fail Deselect Voltage)

– M48T129Y: 4.2V

≤ VPFD ≤ 4.5V

– M48T129V: 2.7V

≤ VPFD ≤ 3.0V

s

CONVENTIONAL SRAM OPERATION;

UNLIMITED WRITE CYCLES

s

SOFTWARE CONTROLLED CLOCK

CALIBRATION for HIGH ACCURACY

APPLICATIONS

s

10 YEARS of DATA RETENTION and CLOCK

OPERATION in the ABSENCE of POWER

s

SELF CONTAINED BATTERY and CRYSTAL

in DIP PACKAGE

s

MICROPROCESSOR POWER-ON RESET

(Valid even during battery back-up mode)

s

PROGRAMMABLE ALARM OUTPUT ACTIVE

in BATTERY BACK-UP MODE

s

SURFACE MOUNT CHIP SET PACKAGING

INCLUDES a 44-PIN SOIC and a 32-LEAD

TSOP (SNAPHAT TOP TO BE ORDERED

SEPARATELY)

s

SOIC PACKAGE PROVIDES DIRECT

CONNECTION for a SNAPHAT TOP WHICH

CONTAINS the BATTERY and CRYSTAL

s

SNAPHAT® HOUSING (BATTERY/CRYSTAL)

IS REPLACEABLE

Figure 1. Logic Diagram

AI02260

17

A0-A16

DQ0-DQ7

VCC

M48T129Y

M48T129V

G

VSS

8

E

W

RST

IRQ/FT

32

1

SOH44

Surface Mount Chip Set Solution (CS)

SNAPHAT (SH)

Battery

PMDIP32 (PM)

Module

TSOP32

(8 x 20mm)

Similar Part No. - M48T129Y

Manufacturer	Part #	Datasheet	Description
STMicroelectronics	M48T129Y	481Kb / 30P	5.0 or 3.3V, 1 Mbit (128 Kbit x 8) TIMEKEEPER SRAM Feb-2005
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