MAX6316–MAX6322
General Description
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Benefits and Features
● Integrated Configuration Enables Flexible Designs
• Available in 26 Reset-Threshold Voltages
- 2.5V to 5V, in 100mV Increments
•
Four Reset Timeout Periods
- 1ms, 20ms, 140ms, or 1.12s (min)
•
Four Watchdog Timeout Periods
- 6.3ms, 102ms, 1.6s, or 25.6s (typ)
•
Four Reset Output Stages
- Active-High, Push/Pull
- Active-Low, Push/Pull
- Active-Low, Open-Drain
- Active-Low, Bidirectional
● Integrated Features Increase Robustness
• Guaranteed Reset Valid to V
CC
= 1V
• Immune to Short-Negative V
CC
Transients
● Saves Board Space
•
No External Components
•
Small 5-Pin SOT23 Package
•
AEC-Q100 Qualified
The MAX6316–MAX6322 family of microprocessor (μP)
supervisory circuits monitors power supplies and micro-
processor activity in digital systems. It offers several com-
binations of push/pull, open-drain, and bidirectional (such
as Motorola 68HC11) reset outputs, along with watchdog
and manual reset features. The
Selector Guide
below lists
the specific functions available from each device.
These devices are available in 26 factory-trimmed reset
threshold voltages (from 2.5V to 5V, in 100mV increments),
featuring four minimum power-on reset timeout periods
(from 1ms to 1.12s), and four watchdog timeout periods
(from 6.3ms to 25.6s). Thirteen standard versions are
available with an order increment requirement of 2500
pieces (see
Standard Versions
table); contact the factory
for availability of other versions, which have an order
increment requirement of 10,000 pieces.
The MAX6316–MAX6322 are offered in a miniature 5-pin
SOT23 package.
Applications
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Ordering Information
PART
MAX6316LUK____-T
MAX6316LUK____/V+T
MAX6316MUK____-T
MAX6317HUK____-T
MAX6318HUK____-T
MAX6318MHUK____-T
TEMP RANGE
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
-40°C to +125°C
PIN-PACKAGE
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
5 SOT23
Portable Computers
Computers
Controllers
Intelligent Instruments
Portable/Battery-Powered Equipment
Embedded Control Systems
Typical Operating Circuit
and
Pin Configurations
appears at
end of data sheet.
Devices are available in both leaded and lead(Pb)-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
/V Denotes an automotive-qualified part.
Ordering Information
appears at end of data sheet.
RESET OUTPUTS*
Selector Guide
PART
MAX6316L
MAX6316M
MAX6317H
MAX6318LH
MAX6318MH
MAX6319LH
MAX6319MH
MAX6320P
MAX6321HP
MAX6322HP
WATCHDOG
INPUT
✔
✔
✔
✔
✔
—
—
✔
✔
—
MANUAL
RESET
INPUT
✔
✔
✔
—
—
✔
✔
✔
—
✔
ACTIVE-LOW
PUSH/PULL
✔
—
—
✔
—
✔
—
—
—
—
ACTIVE-HIGH
PUSH/PULL
—
—
✔
✔
✔
✔
✔
—
✔
✔
ACTIVE-LOW
BIDIRECTIONAL
—
✔
—
—
✔
—
✔
—
—
—
ACTIVE-LOW
OPEN-DRAIN
—
—
—
—
—
—
—
✔
✔
✔
*The MAX6318/MAX6319/MAX6321/MAX6322 feature two types of reset output on each device.
19-0496; Rev 13; 5/17
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Absolute Maximum Ratings
Voltage (with respect to GND)
V
CC
......................................................................-0.3V to +6V
RESET
(MAX6320/MAX6321/MAX6322 only)
....-0.3V to +6V
All Other Pins........................................
-0.3V to (V
CC
+ 0.3V)
Input/Output Current, All Pins
.............................................20mA
Continuous Power Dissipation (T
A
= +70°C)
SOT23 (derate 7.1mW/°C above +70°C)
....................571mW
Operating Temperature Range ......................... -40°C to +125°C
Junction Temperature ......................................................+150°C
Storage Temperature Range ............................ -65°C to +160°C
Lead Temperature (soldering, 10s)
................................. +300°C
Soldering Temperature (reflow)
Leaded Package
..........................................................+240°C
Lead-Free Package
.....................................................+260°C
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these
or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect
device reliability.
Electrical Characteristics
PARAMETER
Operating Voltage Range
Supply Current
(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)
SYMBOL
V
CC
I
CC
CONDITIONS
T
A
= -40°C to +125°C
MAX6316/MAX6317/MAX
6318/MAX6320/MAX6321
MAX6319/MAX6322:
MR
unconnected
V
CC
= 5.5V
V
CC
= 3.6V
V
CC
= 5.5V
V
CC
= 3.6V
MIN
1.0
10
5
3
3
40
T
A
= +25°C
T
A
= -40°C to +125°C
MAX63_ _ A_-T
Reset Active Timeout Period
V
CC
to
RESET
Delay
t
RP
t
RD
MAX63_ _ B_-T
MAX63_ _ C_-T
MAX63_ _ D_-T
V
CC
falling at 1mV/µs
V
TH
- 1.5%
V
TH
- 2.5%
1
20
140
1120
V
TH
V
TH
3
1.4
28
200
1600
40
0.3
0.3
0.3
0.4
0.8 x V
CC
V
CC
- 1.5
5
25
0.3
0.4
0.8 x V
CC
0.8 x V
CC
V
CC
- 1.5
V
ns
V
V
TH
+ 1.5%
V
TH
+ 2.5%
2
40
280
2240
µs
ms
TYP
MAX
5.5
20
12
12
8
ppm/°C
V
mV
µA
UNITS
V
Reset Threshold Temperature
Coefficient
Reset Threshold (Note 2)
Reset Threshold Hysteresis
DV
TH
/°C
V
RST
PUSH/PULL RESET OUTPUT (MAX6316L/MAX6317H/MAX6318_H/MAX6319_H/MAX6321HP/MAX6322HP)
V
CC
≥ 1.0V, I
SINK
= 50µA
V
OL
V
CC
≥ 1.2V, I
SINK
= 100µA
V
CC
≥ 2.7V, I
SINK
= 1.2mA
V
CC
≥ 4.5V, I
SINK
= 3.2mA
V
OH
RESET
Output Voltage
V
CC
≥ 2.7V, I
SOURCE
= 500µA
V
CC
≥ 4.5V, I
SOURCE
= 800µA
Rise time is measured from 10% to 90%
of V
CC
; C
L
= 5pF, V
CC
= 3.3V (Note 3)
V
CC
≥ 2.7V, I
SINK
= 1.2mA
V
CC
≥ 4.5V, I
SINK
= 3.2mA
V
CC
≥ 1.8V, I
SOURCE
= 150µA
V
CC
≥ 2.7V, I
SOURCE
= 500µA
V
CC
≥ 4.5V, I
SOURCE
= 800µA
RESET
Rise Time (MAX6316L,
MAX6318LH, MAX6319LH)
t
R
V
OL
RESET Output Voltage
V
OH
Note 1:
Overtemperature limits are guaranteed by design, not production tested.
Note 2:
A factory-trimmed voltage divider programs the nominal reset threshold (V
TH
). Factory-trimmed reset thresholds are avail-
able in 100mV increments from 2.5V to 5V (see Table 1 at end of data sheet).
Note 3:
Guaranteed by design.
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Maxim Integrated │
2
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Electrical Characteristics (continued)
PARAMETER
SYMBOL
t
S
t
R
V
PTH
(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)
BIDIRECTIONAL
RESET
OUTPUT (MAX6316M/MAX6318MH/MAX6319MH)
Transitional Flip-Flop Setup Time
RESET
Output Rise Time
(Note 5)
Active Pullup Enable Threshold
RESET
Active Pullup Current
RESET
Pullup Resistance
(Note 4)
V
CC
= 3.0V, C
L
= 120pF
V
CC
= 5.0V, C
L
= 200pF
V
CC
= 3.0V, C
L
= 250pF
V
CC
= 5.0V, C
L
= 400pF
V
CC
= 5.0V
V
CC
= 5.0V
0.4
4.2
3.6
0.65
20
4.7
4.7
5.2
5.8
0.3
0.3
0.3
0.4
1.0
MAX63_ _ _W-T
Watchdog Timeout Period
WDI Pulse Width
WDI Input Threshold
WDI Input Current
(Note 7)
t
WD
t
WDI
V
IH
I
WDI
V
IL
V
IL
V
IL
MAX63_ _ _X-T
MAX63_ _ _Y-T
MAX63_ _ _Z-T
V
IL
= 0.3 x V
CC,
V
IH
= 0.7 x V
CC
(Note 6)
WDI = V
CC
, time average
V
WDI
= 0V, time average
V
TH
> 4.0V
V
TH
< 4.0V
T
A
= -40°C to +85°C
T
A
= -40°C to +125°C
4.3
71
1.12
17.9
50
0.3 x V
CC
120
-20
0.8
2.0
0.3 x V
CC
1
1.5
100
35
V
CC
= 5V
52
230
75
0.7 x V
CC
µs
ns
kΩ
ns
V
-15
0.7 x V
CC
160
6.3
102
1.6
25.6
9.3
153
2.4
38.4
µA
V
CONDITIONS
MIN
TYP
400
333
333
666
666
V
mA
kΩ
ns
MAX
UNITS
ns
T
A
= -40°C to +85°C
OPEN-DRAIN
RESET
OUTPUT (MAX6320P/MAX6321HP/MAX6322HP)
V
CC
> 1.0V, I
SINK
= 50µA
RESET
Output Voltage
V
OL
V
CC
> 1.2V, I
SINK
= 100µA
V
CC
> 2.7V, I
SINK
= 1.2mA
V
CC
> 4.5V, I
SINK
= 3.2mA
Open-Drain Reset Output
Leakage Current
I
LKG
T
A
= -40°C to +125°C
WATCHDOG INPUT (MAX6316/MAX6317H/MAX6318_H/MAX6320P/MAX6321HP)
ms
s
ns
V
µA
MANUAL RESET INPUT (MAX6316_/MAX6317H/MAX6319_H/MAX6320P/MAX6322HP)
MR
Input Threshold
V
IH
V
IH
MR
Input Pulse Width
MR
Glitch Rejection
MR
Pullup Resistance
MR
to Reset Delay
Note
Note
Note
Note
4:
5:
6:
7:
This is the minimum time
RESET
must be held low by an external pulldown source to set the active pullup flip-flop.
Measured from
RESET
V
OL
to (0.8 x V
CC
), R
LOAD
= ∞.
WDI is internally serviced within the watchdog period if WDI is left unconnected.
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 capaci-
tive load of 200pF. The three-state device must be able to source and sink at least 200μA when active.
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Maxim Integrated │
3
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Typical Operating Characteristics
T
A
= +25°C, unless otherwise noted.)
MAX6316/MAX6317/MAX6318/MAX6320/MAX6321
SUPPLY CURRENT vs. TEMPERATURE
MAX6316toc01
V
CC
FALLING TO RESET PROPAGATION
DELAY vs. TEMPERATURE
RESET PROPAGATION DELAY (µs)
90
80
70
60
50
40
30
20
10
0
-40
-20
0
20
40
60
80
100
V
CC
FALLING AT 1mV/µs
V
RST
- V
CC
= 100mV
MAX6316toc02
9
SUPPLY CURRENT (µA)
8
7
6
5
4
3
2
1
0
-40
V
CC
= 5V
300
PROPAGATION DELAY (ns)
280
260
240
220
200
180
160
140
-40
V
CC
= 5V
V
CC
= 3V
V
CC
= 1V
-20
0
20
40
60
80
100
TEMPERATURE (°C)
TEMPERATURE (°C)
-20
0
20
40
60
80
100
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT
PERIOD vs. TEMPERATURE
NORMALIZED WATCHDOG TIMEOUT PERIOD
NORMALIZED RESET TIMEOUT PERIOD
MAX6316toc04
MAX6316/MAX6317/MAX6318/MAX6320/MAX6321
NORMALIZED WATCHDOG TIMEOUT
PERIOD vs. TEMPERATURE
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40
-20
0
20
40
60
80
100
MAX6316toc05
1.05
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
0.95
-40
-20
0
20
40
60
80
1.05
100
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX6316toc06
80
70
TRANSIENT DURATION (µs)
60
50
40
30
20
10
0
MAXIMUM V
CC
TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
RESET OCCURS ABOVE LINES
V
RST
= 3.3V
V
RST
= 4.63V
V
RST
= 2.63V
MAX6316M/6318MH/6319MH
BIDIRECTIONAL
PULLUP CHARACTERISTICS
+5V
74HC05
INPUT
4.7kΩ
100pF
MAX6316toc07
PASSIVE
4.7k
Ω
PULLUP
2V/div
RESET,
ACTIVE
PULLUP
2V/div
RESET
INPUT
5V/div
INPUT
74HC05
100pF
+5V
V
CC
RESET
MR GND
10
100
1000
200ns/div
RESET THRESHOLD OVERDRIVE (mV) V
RST
- V
CC
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Maxim Integrated │
4
MAX6316toc03
10
100
320
MAX6316/MAX6317/MAX6319/MAX6320/MAX6322
MANUAL RESET TO RESET
PROPAGATION DELAY vs. TEMPERATURE
MAX6316–MAX6322
5-Pin μP Supervisory Circuits with
Watchdog and Manual Reset
Pin Description
PIN
MAX6316L
MAX6316M
MAX6320P
MAX6317H
MAX6318LH
MAX6318MH
MAX6321HP
MAX6319LH
MAX6319MH
MAX6322HP
NAME
FUNCTION
MAX6316L/MAX6318LH/MAX6319LH: Active-
Low, Reset Output. CMOS push/pull output
(sources and sinks current).
MAX6316M/MAX6318MH/MAX6319MH:
Bidirectional,
Active-Low, Reset Output.
Intended to interface directly to microprocessors
with bidirectional resets such as the Motorola
68HC11.
MAX6320P/MAX6321HP/MAX6322HP:
Open-Drain, Active-Low,
Reset Output. NMOS out-
put (sinks current only). Connect a pullup resistor
from
RESET
to any supply voltage up to 6V.
—
2
1
2
3
2
3
2
RESET
GND
Active-High, Reset Output. CMOS push/pull output
(sources and sinks current). Inverse of
RESET.
Ground
Active-Low, Manual Reset Input.
Pull
low to force
a reset. Reset remains asserted for the duration
of the
Reset Timeout Period after
MR
transitions
from low to high. Leave unconnected or connected
to V
CC
if not used.
Watchdog Input. Triggers a reset if it remains either
high or low for the duration of the watchdog timeout
period. The internal watchdog timer clears
whenever a reset asserts or
whenever WDI
sees a
rising or falling edge. To disable the watchdog
fea- ture, leave
WDI
unconnected or three-state the
dri- ver connected to
WDI.
Supply Voltage. Reset is asserted when V
CC
drops below the Reset Threshold Voltage (V
RST
).
Reset remains asserted until V
CC
rises above
V
RST
and for the duration of the Reset Timeout
Period (t
RP
) once V
CC
rises above V
RST
.
1
—
1
1
RESET
3
3
—
4
MR
4
4
4
—
WDI
5
5
5
5
V
CC
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5
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