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CAT1161LI-45-G Datasheet(PDF) 6 Page - ON Semiconductor

Part # CAT1161LI-45-G
Description  Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer (16K)
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

CAT1161LI-45-G Datasheet(HTML) 6 Page - ON Semiconductor

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CAT1161, CAT1162
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6
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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