MAX6301 Datasheet, PDF (3/12 Pages) Maxim Integrated Products – +5V, Low-Power uP Supervisory Circuits with Adjustable Reset/Watchdog

+5V, Low-Power µP Supervisory Circuits
with Adjustable Reset/Watchdog
ELECTRICAL CHARACTERISTICS (continued)
(V_CC = +2V to +5.5V, T_A = T_MIN to T_MAX, unless otherwise noted. Typical values are at V_CC = +5V and T_A = +25°C.)
PARAMETER
WATCHDOG TIMER
WDI, WDS Input Threshold
WDI Pulse Width
WDI, WDS Leakage Current
SYMBOL
CONDITIONS
V_IH
V_IL
t_WP
V_CC = 4.5V to 5.5V
V_CC = 2V to 4.5V
Extended mode disabled
MIN TYP MAX UNITS
0.7V_CC
30
60
V
0.3V_CC
ns
±1
µA
WDI Sink/Source Current
(Note 4)
Extended mode enabled
±70
µA
Watchdog Timeout Period
(Note 3)
t_WD
WDS = GND, C_SWT = 1500pF
WDS = V_CC, C_SWT = 1500pF
2.8
4.0
5.2
ms
1.4
2.0
2.6
sec
Note 1: Reset is guaranteed valid from the selected reset threshold voltage down to the minimum V_CC.
Note 2: VDS = V_CC, WDI unconnected.
Note 3: Precision timing currents of 500nA are present at both the SRT and SWT pins. Timing capacitors connected to these nodes
must have low leakage consistent with these currents to prevent timing errors.
Note 4: The sink/source is supplied through a resistor, and is proportional to V_CC (Figure 8). At V_CC = 2V, it is typically ±24µA.
__________________________________________Typical Operating Characteristics
(C_SWT = C_SRT = 1500pF, T_A = +25°C, unless otherwise noted.)
10,000
RESET TIMEOUT PERIOD
vs. C_SRT
V_CC = 5V
1000
10,000
EXTENDED-MODE
WATCHDOG TIMEOUT PERIOD vs. C_SWT
(WDS = V_CC)
V_CC = 5V
1000
10,000
NORMAL-MODE
WATCHDOG TIMEOUT PERIOD vs. C_SWT
(WDS = GND)
V_CC = 5V
1000
100
100
100
10
10
10
1
1
1
0
0.001 0.01
0.1 1 10
C_SRT (nF)
100 1000
0
0.001 0.01
0.1 1 10
C_SWT (nF)
100 1000
0.1
0.001 0.01
0.1 1 10
C_SWT (nF)
100 1000
_______________________________________________________________________________________ 3