DS1746W-120 查看數據表（PDF） - Dallas Semiconductor -> Maxim Integrated

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DS1746W-120

Y2KC Nonvolatile Timekeeping RAM

Dallas Semiconductor -> Maxim Integrated 

DS1746/DS1746P

Y2KC Nonvolatile Timekeeping RAM

www.dalsemi.com

FEATURES

Integrated NV SRAM, real time clock,

crystal, power-fail control circuit and lithium

energy source

Clock registers are accessed identical to the

static RAM. These registers are resident in the

eight top RAM locations.

Century byte register; ie., Y2K compliant

Totally nonvolatile with over 10 years of

operation in the absence of power

BCD coded century, year, month, date, day,

hours, minutes, and seconds with automatic

leap year compensation valid up to the year

2100

Battery voltage level indicator flag

Power-fail write protection allows for ±10%

VCC power supply tolerance

Lithium energy source is electrically

disconnected to retain freshness until power is

applied for the first time

DIP Module only

- Standard JEDEC bytewide 128k x 8 static

RAM pinout

PowerCap Module Board only

- Surface mountable package for direct

connection to PowerCap containing

battery and crystal

- Replaceable battery (PowerCap)

- Power-On Reset Output

- Pin for pin compatible with other densities

of DS174XP Timekeeping RAM

PIN ASSIGNMENT

NC 1

A16 2

A14 3

A12 4

A7 5

A6 6

A5 7

A4 8

A3 9

A2 10

A1 11

A0 12

DQ0 13

DQ1 14

DQ2 15

GND 16

32

VCC

31 A15

30 NC

29 WE

28

A13

27 A8

26

A9

25 A11

24

OE

23 A10

22

CE

21

DQ7

20 DQ6

19

DQ5

18 DQ4

17 DQ3

32-Pin Encapsulated Package

NC 1

34

NC

A15 2

33

NC

A16 3

RST 4

VCC

WE

5

6

32

A14

31

A13

30

A12

29

A11

OE 7

CE

DQ7

8

9

28

A10

27

A9

26

A8

DQ6 10

25

A7

DQ5 11

DQ4 12

24

A6

23

A5

DQ3 13

22

A4

DQ2

DQ1

DQ0

14

21

15

16

X1 GND VBAT X2

20

19

A3

A2

A1

GND 17

18

A0

34-Pin PowerCap Module Board

(Uses DS9034PCX PowerCap)

1 of 18

022101

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