X24645

2

ICmic E

2

PROMs are designed and tested for applications

requiring extended endurance. Inherent data

retention is greater than 100 years.

PIN DESCRIPTIONS

Serial Clock (SCL)

The SCL input is used to clock all data into and out of the

device.

Serial Data (SDA)

SDA is a bidirectional pin used to transfer data into and

out of the device. It is an open drain output and

may be wire-ORed with any number of open drain or

open collector outputs.

An open drain output requires the use of a pull-up

resistor. For selecting typical values, refer to the Pull-

up resistor selection graph at the end of this data

sheet.

and second bits of the 8-bit slave address. This

allows up to four X24645 devices to share a common bus.

These inputs can be static or actively driven. If

appropriate. If actively driven, they must be driven with

Write Protect (WP)

The write protect input controls the hardware write

protect feature. When held LOW, hardware write

protection is disabled and the X24645 can be written

normally. When this input is held HIGH, and the WPEN

bit in the write protect register is set HIGH, write

protection is enabled, and nonvolatile writes are

disabled to the selected blocks as well as the write

protect register itself.

PIN NAMES

2783 FRM T01.1

Symbol

Description

Device Select Inputs

SDA

Serial Data

SCL

Serial Clock

WP

Write Protect

Ground

Supply Voltage

NC

No Connect

PIN CONFIGURATIONS

V

CC

WP

SCL

SDA

NC

S

1

S

2

V

SS

1

2

3

4

8

7

6

5

X24645

8-LEAD DIP & SOIC

NC

NC

NC

S

1

S

2

V

SS

NC

1

2

3

4

5

6

7

14

13

12

11

10

9

8

NC

NC

V

CC

WP

SCL

SDA

NC

X24645

14-LEAD SOIC

NC

V

CC

WP

NC

NC

NC

SCL

SDA

NC

NC

2783 ILL F02.4

NC

NC

S

1

NC

NC

NC

S

2

V

SS

NC

NC

1

2

3

4

5

6

7

8

9

10

20

19

18

17

16

15

14

13

12

11

X24645

20-LEAD TSSOP