Datasheet
MAX6316–MAX6322
5-Pin µP Supervisory Circuits with
Watchdog and Manual Reset
3
Maxim Integrated
Note 4: This is the minimum time RESET must be held low by an external pulldown source to set the active pullup flip-flop.
Note 5: Measured from RESET V
OL
to (0.8 x V
CC
), R
LOAD
= ∞.
Note 6: WDI is internally serviced within the watchdog period if WDI is left unconnected.
Note 7: The WDI input current is specified as the average input current when the WDI input is driven high or low. The WDI input is
designed for a three-stated-output device with a 10µA maximum leakage current and capable of driving a maximum capac-
itive load of 200pF. The three-state device must be able to source and sink at least 200µA when active.
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 2.5V to 5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
BIDIRECTIONAL RESET OUTPUT (MAX6316M/MAX6318MH/MAX6319MH)
Transitional Flip-Flop Setup Time t
S
(Note 4) 400 ns
V
CC
= 3.0V, C
L
= 120pF 333
V
CC
= 5.0V, C
L
= 200pF 333
V
CC
= 3.0V, C
L
= 250pF 666
RESET Output Rise Time
(Note 5)
t
R
V
CC
= 5.0V, C
L
= 400pF 666
ns
Active Pullup Enable Threshold V
PTH
V
CC
= 5.0V 0.4 0.65 V
RESET Active Pullup Current
V
CC
= 5.0V 20 mA
T
A
= -40°C to +85°C 4.2 4.7 5.2
RESET Pullup Resistance
T
A
= -40°C to +125°C 3.6 4.7 5.8
kΩ
OPEN-DRAIN RESET OUTPUT (MAX6320P/MAX6321HP/MAX6322HP)
V
CC
> 1.0V, I
SINK
= 50µA 0.3
V
CC
> 1.2V, I
SINK
= 100µA 0.3
V
CC
> 2.7V, I
SINK
= 1.2mA 0.3
RESET Output Voltage V
OL
V
CC
> 4.5V, I
SINK
= 3.2mA 0.4
V
Open-Drain Reset Output
Leakage Current
I
LKG
1.0 µA
WATCHDOG INPUT (MAX6316/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP)
MAX63_ _ _W-T 4.3 6.3 9.3
MAX63_ _ _X-T 71 102 153
ms
MAX63_ _ _Y-T 1.12 1.6 2.4
Watchdog Timeout Period t
WD
MAX63_ _ _Z-T 17.9 25.6 38.4
s
WDI Pulse Width t
WDI
V
IL
= 0.3 x V
CC,
V
IH
= 0.7 x V
CC
50 ns
V
IL
0.3 x V
CC
WDI Input Threshold
V
IH
(Note 6)
0.7 x V
CC
V
WDI = V
CC
, time average 120 160
WDI Input Current
(Note 7)
I
WDI
V
WDI
= 0V, time average -20 -15
µA
MANUAL RESET INPUT (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP)
V
IL
0.8
V
IH
V
TH
> 4.0V
2.0
V
IL
0.3 x V
CC
MR Input Threshold
V
IH
V
TH
< 4.0V
0.7 x V
CC
V
T
A
= -40°C to +85°C 1
MR Input Pulse Width
T
A
= -40°C to +125°C 1.5
µs
MR Glitch Rejection 100 ns
MR Pullup Resistance 35 52 75 kΩ
MR to Reset Delay V
CC
= 5V 230 ns