A1

A0

Q0

A7

A4

A3

A2

A6

A5

A13

A10

A8

A9

Q7

A14

A11

G

E

Q5

Q1

Q2

Q3

VSS

Q4

Q6

A12

ASVPP

VCC

AI00929

M87C257

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

Warning: NC = Not Connected, DU = Dont’t Use.

AI00930

A8

A10

17

A0

NC

Q0

A6

A3

A2

A1

A5

A4

9

A9

1

A11

Q6

Q7

32

M87C257

NC

G

E

25

Figure 2B. LCC Pin Connections

DEVICE OPERATION

The modes of operation of the M87C257 are listed

in the Operating Modes. A single power supply is

required in the read mode. All inputs are TTL levels

ture.

Read Mode

The M87C257 has two control functions, both of

which must be logically active 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

Symbol

Parameter

Value

Unit

Ambient Operating Temperature

–40 to 125

°C

Temperature Under Bias

–50 to 125

°C

Storage Temperature

–65 to 150

°C

(2)

Input or Output Voltages (except A9)

–2 to 7

V

Supply Voltage

–2 to 7

V

(2)

A9 Voltage

–2 to 13.5

V

Program Supply Voltage

–2 to 14

V

Notes: 1. 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.

2. Minimum DC voltage on Input or Output is –0.5V with possible undershoot to –2.0V for a period less than 20ns. Maximum DC

2/13

M87C257