CAT824_12 Datasheet, PDF (4/12 Pages) ON Semiconductor – System Supervisory Voltage Reset

CAT823, CAT824, CAT825
Table 3. ELECTRICAL OPERATING CHARACTERISTICS (DC Characteristics: V_CC = 3.0 V to 5.5 V for L/M versions;
V_CC = 2.0 V to 3.6 V for the R/S/T/U/Y/Z version, −40°C ≤ T_A ≤ +85°C unless otherwise noted. Typical Values at T_A = 25°C and V_CC = 5 V
for L/M versions; V_CC = 3.3 V for the T/S versions; V_CC = 3.0 V for the R version; and V_CC = 2.5 V for the U/Y/Z versions.) (Note 1)
Symbol
Parameter
Conditions
Min
Typ
Max
Units
WATCHDOG INPUT (CAT823 & CAT824)
t_WD
Watchdog Timeout Period
t_WDI
WDI Pulse Width
V_IL = 0.4 V, V_IH = 0.8 x V_CC
V_IL
WDI Input Voltage (Note 3)
V_IH
WDI Input Current (Note 4) WDI = V_CC, Time Average
WDI = 0 V, Time Average
1.12
50
0.7 x V_CC
−20
1.60
3.20
s
ns
0.3 x V_CC
V
120
160
mA
−15
MANUAL RESET INPUT (CAT823 & CAT825)
V_IL
V_IH
t_PB
t_PDLY
MR Input Voltage
MR Pulse Width
MR low to Reset Delay
MR Noise Immunity
Pulse Width with No Reset
0.7 x V_CC
1
0.3 x V_CC
V
ms
5
ms
100
ns
MR Pullup Resistance
(internal)
35
52
75
kW
1. Over−temperature limits are guaranteed by design and not production tested.
2. The RESET short−circuit current is the maximum pull−up current when reset is driven low by a bidirectional output.
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 10 mA and a maximum capacitance
of less than 200 pF. To clock the WDI input in the active mode the drive device must be able to source or sink at least 200 mA when active.
TYPICAL ELECTRICAL OPERATING CHARACTERISTICS
9
8
7
6
5
4
3
2
1
−40 −20 0 20 40 60 80 100 120
TEMPERATURE (°C)
Figure 2. V_CC Supply Current vs. Temperature
1.06
1.04
1.02
1.00
0.98
0.96
0.94
−40 −20
0
20 40
60 80 100
TEMPERATURE (°C)
Figure 3. Normalized Reset Threshold Voltage
vs. Temperature
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