Q2

VSS

A3

A0

Q0

Q1

A2

A1

G

Q5

A10

E

Q3

A11

Q7

Q6

Q4

A13

P

A12

A4

VPP

VCC

A7

AI00770

M27128A

8

1

2

3

4

5

6

7

9

10

11

12

13

14

20

19

18

17

16

15

A6

A5

A9

A8

28

27

26

25

24

23

22

21

Figure 2. DIP Pin Connections

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

grade 1

grade 6

0 to 70

–40 to 85

°C

Temperature Under Bias

grade 1

grade 6

–10 to 80

–50 to 95

°C

Storage Temperature

–65 to 125

°C

Input or Output Voltages

–0.6 to 6.25

V

Supply Voltage

–0.6 to 6.25

V

A9 Voltage

–0.6 to 13.5

V

Program Supply

–0.6 to 14

V

Note: Except for the rating "Operating Temperature Range", stresses above those listed in the Table "Absolute Maximum Ratings" may cause

permanent damage to the device. These are stress ratings only and operation of the device at these or any other conditions above those

indicated in the Operating sections of this specification is not implied. Exposure to Absolute Maximum Rating conditions for extended periods

may affect device reliability. Refer also to the SGS-THOMSON SURE Program and other relevant quality documents.

Table 2. Absolute Maximum Ratings

DEVICE OPERATION

The seven modes of operation of the M27128A are

listed in the Operating Modes table. A single 5V

power supply is required in the read mode. All

for Electronic Signature.

Read Mode

The M27128A has two control functions, both of

which must be logically satisfied in order to obtain

data at the outputs. Chip Enable (E) is the power

control and should be used for device selection.

Output Enable (G) is the output control and should

be used to gate data to the output pins, inde-

pendent of device selection.

Assuming that the addresses are stable, address

the falling edge of G, assuming that E has been low

and the addresses have been stable for at least

Standby Mode

The M27128A has a standby mode which reduces

the maximum active power current from 85mA to

40mA. The M27128A is placed in the standby mode

by applying a TTL high signal to the E input. When

in the standby mode, the outputs are in a high

impedance state, independent of the G input.

Two Line Output Control

Because EPROMs are usually used in larger mem-

ory arrays, this product features a 2 line control

function which accommodates the use of multiple

memory connection. The two line control function

allows:

a. the lowest possible memory power dissipation,

b. complete assurance that output bus contention

will not occur.

2/10

M27128A