CAT823 Datasheet, PDF (5/15 Pages) Catalyst Semiconductor – System Supervisory Voltage Reset with Watchdog and Manual Reset

CAT823, CAT824, CAT825
ELECTRICAL OPERATING CHARACTERISTICS (continued)
DC Characteristics: V_CC = 3.0V to 5.5V for L/M versions; V_CC = 2.0V to 3.6V for the R/S/T/Y/Z version,
-40ºC ≤ T _A ≤ +85ºC unless otherwise noted. Typical Values at T_A = 25ºC and V_CC = 5V for L/M versions;
V_CC = 3.3V for the T/S versions; V_CC = 3.0V for the R version; and V_CC = 2.5V for the Y/Z versions.
Symbol Parameter
Conditions
WATCHDOG INPUT (CAT823 & CAT824)
t_WD Watchdog Timeout Period
t_WDI WDI Pulse Width
V_IL
WDI Input Voltage⁽³⁾
V_IH
WDI Input Current⁽⁴⁾
V_IL = 0.4V, V_IH = 0.8 x V_CC
WDI = V_CC, Time Average
WDI = 0V, Time Average
MANUAL RESET INPUT(CAT823 & CAT825)
V_IL
V_IH
t_PB
t_PDLY
¯M¯R¯ Input Voltage
¯M¯R¯ Pulse Width
¯M¯R¯ low to Reset Delay
¯M¯R¯ Noise Immunity
Pulse Width with No Reset
¯M¯R¯ Pullup Resistance (internal)
Min Typ
1.12 1.60
50
0.7 x V_CC
120
-20 -15
0.7 x V_CC
1
100
35
52
Max Units
3.20
s
ns
0.3 x V_CC
V
160
µA
0.3 x V_CC
V
µs
5
µs
ns
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.
© 2010 SCILLC. All rights reserved.
5
Characteristics subject to change without notice
Doc. No. MD-3027, Rev. D