CAT1163 查看數據表（PDF） - Catalyst Semiconductor => Onsemi

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CAT1163

Supervisory Circuit with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer

Catalyst Semiconductor => Onsemi 

CAT1163

Hardware Data Protection

The CAT1163 is designed with the following hardware

data protection features to provide a high degree of data

integrity.

(1) The CAT1163 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 CAT1163 is offered with five reset threshold voltage

ranges. They are 4.50-4.75V, 4.25-4.50V, 3.00-3.15V,

2.85-3.00V and 2.55-2.70V.

Figure 2. Bus Timing

tF

tHIGH

tR

tLOW

tLOW

SCL

tSU:STA

tHD:DAT

tHD:STA

tSU:DAT

SDA IN

SDA OUT

tAA

tDH

tSU:STO

tBUF

Figure 3. Write Cycle Timing

SCL

SDA

8TH BIT

BYTE n

ACK

Figure 4. Start/Stop Timing

tWR

STOP

CONDITION

START

CONDITION

ADDRESS

SDA

SCL

START BIT

STOP BIT

Doc. No. 3003, Rev. C

6

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