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CAT1163 Datasheet(PDF) 6 Page - Catalyst Semiconductor

Part No. CAT1163
Description  Supervisory Circuits with I2C Serial 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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CAT1163 Datasheet(HTML) 6 Page - Catalyst Semiconductor

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CAT1163
© 2007 Catalyst Semiconductor, Inc.
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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