M48T02

M48T12

November 1998

1/15

INTEGRATED ULTRA LOW POWER SRAM,

REAL TIME CLOCK and POWER-FAIL

CONTROL CIRCUIT

BYTEWIDE

™ RAM-LIKECLOCK ACCESS

BCD CODED YEAR, MONTH, DAY, DATE,

HOURS, MINUTES and SECONDS

TYPICAL CLOCK ACCURACY of

± 1 MINUTE

a MONTH, AT 25

°C

SOFTWARE CONTROLLED CLOCK

CALIBRATION for HIGH ACCURACY

APPLICATIONS

AUTOMATIC POWER-FAILCHIP DESELECTand

WRITE PROTECTION

WRITE PROTECT VOLTAGES

– M48T02: 4.5V

– M48T12: 4.2V

SELF-CONTAINED BATTERY and CRYSTAL

in the CAPHAT DIP PACKAGE

PIN and FUNCTION COMPATIBLE with

JEDEC STANDARD 2Kb x8 SRAMs

DESCRIPTION

non-volatile static RAM and real time clock which

is pin and functional compatible with the DS1642.

A special 24 pin 600mil DIP CAPHAT

™ package

houses the M48T02/12 silicon with a quartz crystal

and a long life lithium button cell to form a highly

integratedbatterybacked-upmemory and real time

clock solution.

AI01027

11

A0-A10

W

DQ0-DQ7

VCC

M48T02

M48T12

G

VSS

8

E

Figure 1. Logic Diagram

A0-A10

Address Inputs

DQ0-DQ7

Data Inputs / Outputs

E

Chip Enable

G

Output Enable

W

Write Enable

Supply Voltage

Ground

Table 1. Signal Names

24

1

PCDIP24 (PC)

Battery/Crystal CAPHAT