CAT1162WI25GT3 datasheet(6/13 Pages) ONSEMI

Part #	CAT1162WI25GT3

Description	Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller

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Manufacturer	ONSEMI [ON Semiconductor]

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CAT1161, CAT1162

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Hardware Data Protection

The CAT1161/2 is designed with the following hardware

data protection features to provide a high degree of data

integrity.

1. The CAT1161/2 features a WP pin. When the WP

pin is tied high the entire memory array becomes

write protected (read only).

2. The VCC sense provides write protection when

VCC falls below the reset threshold value (VTH).

The VCC lock out inhibits writes to the serial

EEPROM whenever VCC falls below (power

down) VTH or until VCC reaches the reset threshold

(power up) VTH. Any attempt to access the

internal EEPROM is not recognized and an ACK

will not be sent on the SDA line when RESET or

RESET is active.

Reset Threshold Voltage

The CAT1161/2 is offered with five reset threshold

voltage ranges. They are 4.50

÷ 4.75 V, 4.25 ÷ 4.50 V,

3.00

÷ 3.15 V, 2.85 ÷ 3.00 V and 2.55 ÷ 2.70 V.

Figure 2. Bus Timing

tHIGH

SCL

SDA IN

SDA OUT

tLOW

tF

tLOW

tR

tBUF

tSU:STO

tSU:DAT

tHD:DAT

tHD:STA

tSU:STA

tAA

tDH

Figure 3. Write Cycle Timing

tWR

STOP

CONDITION

START

CONDITION

ADDRESS

ACK

8TH BIT

BYTE n

SCL

SDA

Figure 4. Start/Stop Timing

START BIT

A

SD

STOP BIT

SCL

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CAT1162WI25GT3 Datasheet(PDF) 6 Page - ON Semiconductor

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