M48T35AV-70PC6 datasheet(1/19 Pages) STMICROELECTRONICS

Part #	M48T35AV-70PC6

Description	256 Kbit 32Kb x8 TIMEKEEPER SRAM

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Manufacturer	STMICROELECTRONICS [STMicroelectronics]

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May 2000

M48T35AY

M48T35AV

256 Kbit (32Kb x8) TIMEKEEPER® SRAM

s

INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK, POWER-FAIL CONTROL

CIRCUIT and BATTERY

s

BYTEWIDE™ RAM-LIKE CLOCK ACCESS

s

BCD CODED YEAR, MONTH, DAY, DATE,

HOURS, MINUTES and SECONDS

s

BATTERY LOW FLAG (BOK)

s

FREQUENCY TEST OUTPUT for REAL TIME

CLOCK

s

AUTOMATIC POWER-FAIL CHIP DESELECT

and WRITE PROTECTION

s

WRITE PROTECT VOLTAGES

(VPFD = Power-fail Deselect Voltage):

– M48T35AY: 4.2V

≤ VPFD ≤ 4.5V

– M48T35AV: 2.7V

≤ VPFD ≤ 3.0V

s

SELF-CONTAINED BATTERY and CRYSTAL

in the CAPHAT DIP PACKAGE

s

SOIC PACKAGE PROVIDES DIRECT

CONNECTION for a SNAPHAT HOUSING

CONTAINING the BATTERY and CRYSTAL

s

SNAPHAT® HOUSING (BATTERY and

CRYSTAL) is REPLACEABLE

s

PIN and FUNCTION COMPATIBLE with

JEDEC STANDARD 32Kb x8 SRAMs

DESCRIPTION

The M48T35AY/35AV TIMEKEEPER® RAM is a

32Kb x8 non-volatile static RAM and real time

clock. The monolithic chip is available in two spe-

cial packages to provide a highly integrated bat-

tery backed-up memory and real time clock

solution.

The M48T35AY/35AV is a non-volatile pin and

function equivalent to any JEDEC standard 32Kb

x8 SRAM. It also easily fits into many ROM,

EPROM, and EEPROM sockets, providing the

non-volatility of PROMs without any requirement

for special write timing or limitations on the number

of writes that can be performed.

Figure 1. Logic Diagram

AI02797B

15

A0-A14

W

DQ0-DQ7

VCC

M48T35AY

M48T35AV

G

VSS

8

E

28

1

28

1

SOH28 (MH)

SNAPHAT (SH)

Battery/Crystal

PCDIP28 (PC)

Battery/Crystal

CAPHAT

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M48T35AV-70PC6 Datasheet(PDF) 1 Page - STMicroelectronics

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