M48T251V-70PM1 View Datasheet(PDF) - STMicroelectronics

Part Name

Description

Manufacturer

M48T251V-70PM1

5.0 or 3.3V, 4096K TIMEKEEPER® SRAM with PHANTOM

STMicroelectronics 

Figure 3. DIP Connections

A18/RST

A16

A14

A12

A7

A6

A5

A4

A3

A2

A1

A0

DQ0

DQ1

DQ2

VSS

1

32

2

31

3

30

4

29

5

28

6

27

7

26

8

M48T251Y

M48T251V

25

9

24

10

23

11

22

12

21

13

20

14

19

15

18

16

17

VCC

A15

A17

WE

A13

A8

A9

A11

OE

A10

CE

DQ7

DQ6

DQ5

DQ4

DQ3

AI04239

M48T251Y, M48T251V

Figure 4. Block Diagram

CE

OE

WE

RST

32.768 Hz

CRYSTAL

CONTROL

LOGIC

READ

WRITE

POWER

FAIL

XO

CLOCK/CALENDAR

LOGIC

XI

UPDATE

TIMEKEEPER

REGISTER

SRAM

ACCESS

ENABLE

SEQUENCE

DETECTOR

COMPARISON

REGISTER

A0–A16

DQ0–DQ7

DQ0

I/O

BUFFERS

VCC

DATA

POWER-FAIL

DETECT

LOGIC

INTERNAL VCC

VBAT

AI04238

5/24

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