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CAT1161 Datasheet(PDF) 6 Page - Catalyst Semiconductor

Part No. CAT1161
Description  Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
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Maker  CATALYST [Catalyst Semiconductor]
Homepage  http://www.catalyst-semiconductor.com
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CAT1161 Datasheet(HTML) 6 Page - Catalyst Semiconductor

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CAT1161/2
Doc. No. 3002, Rev. D
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 4.50-4.75V, 4.25-4.50V, 3.00-
3.15V, 2.85-3.00V and 2.55-2.70V.
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
tHIGH
SCL
SDA IN
SDA OUT
tLOW
tF
tLOW
tR
tBUF
tSU:STO
tSU:DAT
tHD:DAT
tHD:STA
tSU:STA
tAA
tDH
Figure 2. Bus Timing
tWR
STOP
CONDITION
START
CONDITION
ADDRESS
ACK
8TH BIT
BYTE n
SCL
SDA
Figure 3. Write Cycle Timing
START BIT
SDA
STOP BIT
SCL
Figure 4. Start/Stop Timing


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