Symbol

Parameter

Value

Unit

Ambient Operating Temperature

0 to 70

°C

–40 to 85

°C

Temperature Under Bias

–40 to 85

°C

(2)

Lead Soldering Temperature for 10 seconds

260

°C

Input or Output Voltages

–0.3 to 7

V

Supply Voltage

–0.3 to 7

V

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

VSS

VCC

AI02049

M48Z2M1

M48Z2M1Y

10

1

2

5

6

7

8

9

11

12

13

16

17

18

30

29

26

25

24

23

22

21

20

19

3

4

28

27

32

31

14

15

34

33

36

35

A1

A0

DQ0

A7

A4

A3

A2

A6

A5

A13

A10

A8

A9

DQ7

A15

A11

G

E

DQ5

DQ1

DQ2

DQ3

DQ4

DQ6

A16

A18

A12

A14

W

A17

A20

NC

NC

A19

Figure 2. DIP Pin Connections

The M48Z2M1/2M1Y 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 op-

approximately 3V, the control circuitry connects the

batteries which sustain data until valid power re-

turns.

READ MODE

The M48Z2M1/2M1Y is in the Read Mode when-

ever W (Write Enable) is high and E (Chip Enable)

is low. The device architecture allows ripple-

through access of data from eight of 16,777,216

locations in the static storage array. Thus, the

unique address specified by the 21 Address Inputs

defines which one of the 2,097,152 bytes of data is

to be accessed. Valid data will be available at the

after the last address input signal is stable, provid-

ing that the E (Chip Enable) and G (Output Enable)

access times are also satisfied. If the E and G

access times are not met, valid data will be avail-

DESCRIPTION (cont’d)

Warning: NC = Not Connected.

2/12

M48Z2M1, M48Z2M1Y