CAT1163LI-42 datasheet(6/14 Pages) CATALYST

Teilenummer	CAT1163LI-42

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

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Hersteller	CATALYST [Catalyst Semiconductor]

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CAT1163

6

Doc. No. 3003 Rev. E

Characteristics subject to change without notice

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

Figure 3. Write Cycle Timing

Figure 4. Start/Stop Timing

tHIGH

SCL

SDA IN

SDA OUT

tLOW

tF

tLOW

tR

tBUF

tSU:STO

tSU:DAT

tHD:DAT

tHD:STA

tSU:STA

tAA

tDH

tWR

STOP

CONDITION

START

CONDITION

ADDRESS

ACK

8TH BIT

BYTE n

SCL

SDA

START BIT

SDA

STOP BIT

SCL

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