Preliminary Information
Write Cycle Timing
SCL
X1288
SDA
8th Bit of Last Byte
ACK
t
WC
Stop
Condition
Start
Condition
Power Up Timing
Symbol
t
PUR
(1)
t
PUW
(1)
Parameter
Time from Power Up to Read
Time from Power Up to Write
Min.
Typ.
(2)
Max.
1
5
Units
ms
ms
Notes:
(1) Delays are measured from the time V
CC
is stable until the specified operation can be initiated. These parameters are not 100%
tested. V
CC
slew rate should be between 0.2mV/µsec and 50mV/µsec.
(2) Typical values are for T
A
= 25°C and V
CC
= 5.0V
Nonvolatile Write Cycle Timing
Symbol
t
WC
(1)
Note:
Parameter
Write Cycle Time
Min.
Typ.
(1)
5
Max.
10
Units
ms
(1) t
WC
is the time from a valid stop condition at the end of a write sequence to the end of the self-timed internal nonvolatile write cycle.
It is the minimum cycle time to be allowed for any nonvolatile write by the user, unless Acknowledge Polling is used.
WATCHDOG TIMER/LOW VOLTAGE RESET OPERATING CHARACTERISTICS
Watchdog/Low Voltage Reset Parameters (See Figures 3 and 4)
Symbols
V
PTRIP
Parameters
Programmed Reset Trip Voltage
X1288-4.5A
X1288
X1288-2.7A
X1288-2.7
V
CC
Detect to RESET LOW
Power Up Reset Time-out Delay
V
CC
Fall Time
V
CC
Rise Time
Watchdog Timer Period (Crystal=32.768kHz):
WD1=0, WD0=0, (default)
WD1=0, WD0=1
WD1=1, WD0=0
Watchdog Reset Time-out Delay (Crystal=32.768kHz)
2-Wire interface
Reset Valid V
CC
Min.
4.50
4.25
2.75
2.55
100
10
10
1.7
725
225
225
1
1.0
Typ.
4.63
4.38
2.85
2.65
250
Max.
4.75
4.50
2.95
2.75
500
400
Unit
V
t
RPD
t
PURST
t
F
t
R
t
WDO
ns
ms
µs
µs
1.75
750
250
250
1.8
775
275
275
s
ms
ms
ms
µs
V
t
RST
t
RSP
V
RVALID
REV 1.1.30 3/24/04
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