CAT1161LI-30T2 CATALYST [Catalyst Semiconductor], CAT1161LI-30T2 Datasheet - Page 6

• Manufacturer Part Number: CAT1161LI-30T2
• Description: Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer
• Manufacturer: CATALYST [Catalyst Semiconductor]

CAT1161, CAT1162
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
(2) The V
Figure 2. Bus Timing
Figure 3. Write Cycle Timing
Figure 4. Start/Stop Timing
© 2007 Catalyst Semiconductor, Inc.
Characteristics subject to change without notice
pin is tied high the entire memory array becomes
write protected (read only).
falls below the reset threshold value (V
V
whenever V
CC
lock out inhibits writes to the serial EEPROM
CC
SCL
SDA
sense provides write protection when V
SDA OUT
CC
SDA IN
SCL
falls below (power down) V
SDA
SCL
t SU:STA
8TH BIT
BYTE n
START BIT
t F
t HD:STA
t LOW
ACK
t AA
TH
t HD:DAT
). The
t HIGH
TH
CC
or
STOP
CONDITION
6
t LOW
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.
t DH
until V
V
is not recognized and an ACK will not be sent on
the SDA line when RESET or RESET
t SU:DAT
t R
TH
. Any attempt to access the internal EEPROM
t WR
CC
reaches the reset threshold (power up)
STOP BIT
START
CONDITION
t SU:STO
t BUF
¯¯¯¯¯¯ is active.
ADDRESS
Doc. No. 3002 Rev. F