M48Z512A, M48Z512AY

2/17

Figure 2. DIP Connections

A1

A0

DQ0

A7

A4

A3

A2

A6

A5

A13

A10

A8

A9

DQ7

A15

A11

G

E

DQ5

DQ1

DQ2

DQ3

VSS

DQ4

DQ6

A16

A18

VCC

AI02044

M48Z512A

M48Z512AY

10

1

2

5

6

7

8

9

11

12

13

14

15

16

30

29

26

25

24

23

22

21

20

19

18

17

A12

A14

W

A17

3

4

28

27

32

31

Note: 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 –0.3V are not allowed on any pin while in the Battery Back-up mode.

Table 3. Operating Modes

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

0 to 70

°C

–40 to 70

°C

Temperature Under Bias

–40 to 70

°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

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

DESCRIPTION

non-volatile 4,194,304 bit Static RAM organized

as 524,288 words by 8 bits. The device combines

an internal lithium battery, a CMOS SRAM and a

control circuit in a plastic 32 pin DIP Module.

For surface mount environments ST provides a

Chip Set solution consisting of a 28 pin 330mil

SOIC NVRAM Supervisor (M40Z300) and a 32 pin

TSOP Type II (10 x 20mm) LPSRAM (M68Z512)

packages.

The unique design allows the SNAPHAT battery

package to be mounted on top of the SOIC pack-

age after the completion of the surface mount pro-

cess. Insertion of the SNAPHAT housing after

reflow prevents potential battery damage due to

the high temperatures required for device surface-

mounting. The SNAPHAT housing is keyed to pre-

vent reverse insertion.

The SNAPHAT battery package is shipped sepa-

rately in plastic anti-static tubes or in Tape & Reel

form. The part number is ”M4Zxx-BR00SH1”.