X40626

REV 1.1.15 2/11/04

Characteristics subject to change without notice.

2 of 23

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operating level and stabilizes. Four industry standard Vtrip

thresholds are available. However, Xicor’s unique circuits

allow the threshold to be reprogrammed to meet custom

requirements or to fine-tune the threshold for applications

requiring higher precision.

The memory portion of the device is a CMOS Serial

array is internally organized as 64 bytes per page. The

device features an 2-wire interface and software protocol

providing a minimum endurance of 100,000 page write

cycles and a minimum data retention of 100 years.

PIN CONFIGURATION

V2MON

WP

3

2

4

1

12

13

11

14

14 Pin SOIC/TSSOP

NC

RESET

6

5

7

9

10

8

NC

SDA

SCL

V2FAIL

NC

NC

PIN FUNCTION

Pin

Name

Function

1, 4, 6, 13

NC

No Internal Connections

Device Select Input

Device Select Input

5

RESET

enabled and SDA remains either HIGH or LOW longer than the selectable Watchdog time-

out period. A falling edge on SDA, while SCL is HIGH, resets the Watchdog Timer. RESET

goes active on power up and remains active for typically 200ms after the power supply

stabilizes.

Ground

8

SDA

Serial Data. SDA is a bidirectional pin used to transfer data into and out of the device. It has

an open drain output and may be wire ORed with other open drain or open collector outputs.

This pin requires a pull up resistor and the input buffer is always active (not gated).

Watchdog Input. A HIGH to LOW transition on the SDA (while SCL is HIGH) restarts the

Watchdog timer. The absence of a HIGH to LOW transition within the watchdog time-out

period results in RESET going active.

9

SCL

Serial Clock. The Serial Clock controls the serial bus timing for data input and output.

10

V2FAIL

V2 Voltage Fail Output. This open drain output goes LOW when V2MON is less than

switch circuits. Connect V2FAIL to VSS when not used.

11

V2MON

goes LOW. This input can monitor an unregulated power supply with an external resistor

divider or can monitor a second power supply with no external components. Connect

circuits.

12

WP

Write Protect. WP HIGH used in conjunction with WPEN bit prevents writes to the control

register.

14

Supply Voltage