CAT1161LI-25-GT3 CATALYST [Catalyst Semiconductor], CAT1161LI-25-GT3 Datasheet - Page 6

• Manufacturer Part Number: CAT1161LI-25-GT3
• Description: Supervisory Circuits with I2C Serial CMOS EEPROM, Precision Reset Controller and Watchdog Timer (16K)
• 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
© 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
CC
SCL
SDA
sense provides write protection when V
SDA OUT
SDA IN
SCL
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
CC
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
V
whenever V
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
CC
TH
. Any attempt to access the internal EEPROM
t WR
lock out inhibits writes to the serial EEPROM
CC
reaches the reset threshold (power up)
CC
STOP BIT
START
CONDITION
falls below (power down) V
t SU:STO
t BUF
¯¯¯¯¯¯ is active.
ADDRESS
Doc. No. MD-3002 Rev. G
TH
or