CAT1163 Catalyst Semiconductor, CAT1163 Datasheet - Page 6

• Manufacturer Part Number: CAT1163
• Description: Supervisory Circuit with I2C Serial CMOS EEPROM/ Precision Reset Controller and Watchdog Timer
• Manufacturer: Catalyst Semiconductor

Figure 2. Bus Timing
CAT1163
Doc. No. 3003, Rev. C
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 V
falls below the reset threshold value (VTH). The V
out inhibits writes to the serial EEPROM whenever V
falls below (power down) VTH or until V
reset threshold (power up) V
Figure 3. Write Cycle Timing
Figure 4. Start/Stop Timing
SCL
SDA
CC
SDA OUT
SDA IN
sense provides write protection when V
SCL
SDA
SCL
t SU:STA
8TH BIT
BYTE n
TH
.
t F
START BIT
t HD:STA
t LOW
ACK
CC
reaches the
t AA
t HD:DAT
t HIGH
CC
lock
CC
CC
STOP
CONDITION
t LOW
6
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.
t DH
t SU:DAT
t R
t WR
STOP BIT
START
CONDITION
t SU:STO
t BUF
ADDRESS