Symbol

Parameter

Value

Unit

Ambient Operating Temperature

0 to 70

°C

–40 to 85

°C

(2)

Lead Solder Temperature for 10 seconds

260

°C

Input or Output Voltages

–0.3 to 7

V

Supply Voltage

–0.3 to 7

V

Output Current

20

mA

Power Dissipation

1

W

Notes: 1. Stresses greater than those listed under ”Absolute Maximum Ratings” may cause permanent damage to the device. This is a

stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational

section of this specification is not implied. Exposure to the absolute maximum rating conditions for extended periods of time may

affect reliability.

2. Soldering temperature not to exceed 260

°C for 10 seconds (total thermal budget not to exceed 150°C for longer than 30 seconds).

CAUTION: Negative undershoots below –0.3 volts are not allowed on any pin while in the Battery Back-up mode.

Mode

E

G

W

DQ0-DQ7

Power

Deselect

4.75V to 5.5V

or

4.5V to 5.5V

X

X

High Z

Standby

Write

Active

Read

Active

Read

High Z

Active

Deselect

X

X

X

High Z

CMOS Standby

Deselect

X

X

X

High Z

Battery Back-up Mode

Table 3. Operating Modes

A1

A0

DQ0

A7

A4

A3

A2

A6

A5

A10

A8

A9

DQ7

W

G

E

DQ5

DQ1

DQ2

DQ3

VSS

DQ4

DQ6

VCC

AI01028

M48T02

M48T12

8

1

2

3

4

5

6

7

9

10

11

12

16

15

24

23

22

21

20

19

18

17

14

13

Figure 2. DIP Pin Connections

The M48T02/12 button cell has sufficient capacity

and storagelife to maintain data and clockfunction-

ality for an accumulated time period of at least 10

years in the absence of power over the operating

temperature range.

The M48T02/12 is a non-volatile pin and function

equivalent to any JEDEC standard 2Kb 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.

As Figure 3 shows, the staticmemory array and the

quartz controlled clock oscillator of the M48T02/12

are integrated on one silicon chip. The two circuits

are interconnected at the upper eight memory lo-

cations to provide user accessible BYTEWIDE

clock information in the bytes with addresses7F8h-

7FFh. The clock locations contain the year, month,

date, day, hour, minute, and secondin 24 hour BCD

format. Corrections for 28, 29 (leap year), 30, and

31 day months are made automatically.

DESCRIPTION (cont’d)

2/15

M48T02, M48T12