X25643 Datasheet, PDF (12/16 Pages) Xicor Inc. – Programmable Watchdog Timer & V CC Supervisory Circuit w/Serial E 2 PROM

X25643/45
X25323/25
X25163/65
Power-Up and Power-Down Timing
VCC
V_TRIP
0 Volts
t_R
RESET (X25643)
t_PURST
t_PURST
RESET (X25645)
V _TRIP
t_F
t_RPD
RESET Output Timing
Symbol
V_TRIP
t_PURST
t_RPD⁽⁵⁾
t_F⁽⁵⁾
t_R⁽⁵⁾
V_RVALID
Parameter
Reset Trip Point Voltage, 5V Device
Reset Trip Point Voltage, 2.7V Device
Reset Trip Point Voltage, 1.8V Device
Power-up Reset Timeout
V_CC Detect to Reset/Output
V_CC Fall Time
V_CC Rise Time
Reset Valid V_CC
Notes: (5) This parameter is periodically sampled and not 100% tested.
CS vs. RESET/RESET Timing
Min.
4.25
2.55
1.7
100
0.1
0.1
1
CS
RESET
t _CST
t _WDO
t_RST
t_WDO
Typ.
200
t _RST
RESET
RESET/RESET Output Timing
Symbol
t_WDO
t_CST
t_RST
Parameter
Watchdog Timeout Period,
WD1 = 1, WD0 = 0
WD1 = 0, WD0 = 1
WD1 = 0, WD0 = 0
CS Pulse Width to Reset the Watchdog
Reset Timeout
Min.
100
450
1
400
100
Typ.
200
600
1.4
200
12
Max.
4.5
2.7
1.8
280
500
Units
V
V
V
ms
ns
ns
ns
V
7036 FRM T15
Max.
300
800
2
300
Units
ms
ms
sec
ns
ms
7036 FRM T16