CAT1161 datasheet(6/13 Pages) ONSEMI

部品番号	CAT1161

部品情報	Supervisory Circuits withI2C Serial CMOS EEPROM,

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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

同様の部品番号 - CAT1161

メーカー	部品番号	データシート	部品情報
Catalyst Semiconductor	CAT1161	69Kb / 12P	Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
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