Symbol

Parameter

Value

Unit

Ambient Operating Temperature

0 to 70

°C

–40 to 85

°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

Note: 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 ratings conditions for extended periods of time may affect reliability.

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

Table 2. Absolute Maximum Ratings

Mode

E1

E2

G

W

DQ0-DQ7

Power

Deselect

4.75V to 5.5V

or

4.5V to 5.5V

X

X

X

High Z

Standby

Deselect

X

X

X

High Z

Standby

Write

Active

Read

Active

Read

High Z

Active

Deselect

X

X

X

X

High Z

CMOS Standby

Deselect

X

X

X

X

High Z

Battery Back-up Mode

Table 3. Operating Modes

A1

A0

DQ0

A7

A4

A3

A2

A6

A5

E2

A10

A8

A9

DQ7

W

A11

G

E1

DQ5

DQ1

DQ2

DQ3

VSS

DQ4

DQ6

A12

INT

VCC

AI01185

M48Z09

M49Z19

8

1

2

3

4

5

6

7

9

10

11

12

13

14

16

15

28

27

26

25

24

23

22

21

20

19

18

17

Figure 2A. DIP Pin Connections

The M48Z09,19 button cell has sufficient capacity

and storage life to maintain data for an accumu-

lated time period of at least 11 years in the absence

of power over the operating temperature range.

The M48Z09,19 is a non-volatile pin and function

equivalent to any JEDEC standard 8K x 8 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.

The M48Z09,19 also has its own Power-fail Detect

circuit. The control circuitry constantly monitors the

single 5V supply for an out of tolerance condition.

protects the SRAM, providing a high degree of data

security in the midst of unpredictable system opera-

approximately 3V, the control circuitry connects the

battery which maintains data and clock operation

until valid power returns.

DESCRIPTION (cont’d)

2/13

M48Z09, M48Z19