X1288 Datasheet, PDF (7/27 Pages) Xicor Inc. – 2-Wire RTC Real Time Clock/Calendar/CPU Supervisor with EEPROM

X1288
Power-up Timing
Symbol
Parameter
Min.
Typ.⁽²⁾
Max.
Units
t_PUR(1)
t_PUW(1)
Time from Power-up to Read
Time from Power-up to Write
1
ms
5
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
Parameter
Min.
Typ.⁽¹⁾
Max.
Units
t_WC(1)
Write Cycle Time
5
10
ms
Note: (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
Parameters
Min.
Typ.
V_PTRIP
t_RPD
t_PURST
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
4.50
4.63
4.25
4.38
2.75
2.85
2.55
2.65
100
250
Max.
4.75
4.50
2.95
2.75
500
400
Unit
V
ns
ms
t_F
t_R
t_WDO
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
10
µs
10
µs
1.7
1.75
1.8
s
725
750
775
ms
225
250
275
ms
t_RST
Watchdog Reset Time-out Delay (Crystal=32.768kHz)
225
250
275
ms
t_RSP
2-Wire interface
1
µs
V_RVALID
Reset Valid V_CC
1.0
V
7
FN8102.3
April 14, 2006