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CAT823_08 Datasheet, PDF (5/14 Pages) Catalyst Semiconductor – System Supervisory Voltage Reset with Watchdog and Manual Reset
CAT823, CAT824, CAT825
ELECTRICAL OPERATING CHARACTERISTICS (continued)
DC Characteristics: VCC = 3.0V to 5.5V for L/M versions; VCC = 2.0V to 3.6V for the R/S/T/Y/Z version,
-40ºC ≤ TA ≤ +85ºC unless otherwise noted. Typical Values at TA = 25ºC and VCC = 5V for L/M versions;
VCC = 3.3V for the T/S versions; VCC = 3.0V for the R version; and VCC = 2.5V for the Y/Z versions.
Symbol Parameter
WATCHDOG INPUT (CAT823 & CAT824)
tWD Watchdog Timeout Period
tWDI WDI Pulse Width
VIL
WDI Input Voltage(3)
VIH
WDI Input Current(4)
Conditions
VIL = 0.4V, VIH = 0.8 x VCC
WDI = VCC, Time Average
WDI = 0V, Time Average
Min Typ Max Units
1.12 1.60 3.20
s
50
ns
0.7 x VCC
0.3 x VCC V
120
160
µA
-20 -15
MANUAL RESET INPUT(CAT823 & CAT825)
VIL
VIH
tPB
tPDLY
¯M¯R¯ Input Voltage
¯M¯R¯ Pulse Width
¯M¯R¯ low to Reset Delay
¯M¯R¯ Noise Immunity
0.7 x VCC
1
0.3 x VCC V
µs
5
µs
Pulse Width with No Reset
100
ns
¯M¯R¯ Pullup Resistance (internal)
35
52
75
kΩ
Notes:
(3) WDI is internally serviced within the watchdog period if WDI is left open.
(4) The WDI input current is specified as an average input current when the WDI input is driven high or low. The WDI input if connected to a
three-stated output device can be disabled in the tristate mode as long as the leakage current is less than 10µA and a maximum
capacitance of less than 200pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200µA
when active.
© Catalyst Semiconductor, Inc.
5
Characteristics subject to change without notice
Doc. No. MD-3027, Rev. B