19-1508; Rev 5; 2/03
Dual/Triple-Voltage
µP Supervisory Circuits
General Description
The MAX6351–MAX6360 microprocessor (µP) supervi-
sors with multiple reset voltages significantly improve sys-
tem reliability and accuracy compared to separate ICs or
discrete components. If any input supply voltage drops
below its associated preset threshold, all reset outputs
are asserted. In addition, the outputs are valid as long as
either input supply voltage remains greater than +1.0V.
All devices in this series have an active-low debounced
manual reset input. In addition, the MAX6358/MAX6359/
MAX6360 offer a watchdog-timer input with a 46.4s start-
up timeout period and a 2.9s timeout period. The
MAX6355/MAX6356/MAX6357 offer an additional voltage
monitor input to monitor a third voltage.
The MAX6351 features two active-low, push-pull reset
outputs, one is referenced to V
CC
1 and the other is refer-
enced to V
CC
2. The MAX6353/MAX6356/MAX6359 offer
an active-low, push-pull reset output referenced to V
CC
1.
The MAX6354/MAX6357/MAX6360 offer an active-low,
push-pull reset output referenced to V
CC
2.
All these devices are offered with a wide variety of voltage
threshold levels, as shown in the
Voltage Threshold
Levels
table. They are available in 5- and 6-pin SOT23
packages and operate over the extended (-40°C to
+85°C) temperature range.
Features
o
Precision Monitoring of Multiple +1.8V, +2.5V,
+3.0V, +3.3V, and +5V Power-Supply Voltages
o
Precision Factory-Set Power-Supply
Reset Thresholds
o
20µA Supply Current
o
100ms min Power-On Reset Pulse Width
o
Debounced TTL/CMOS-Compatible
Manual-Reset Input
o
Watchdog Timer
46.4s Startup Timeout
2.9s Normal Timeout
o
Fully Guaranteed Over Temperature
o
Guaranteed
RESET
Valid to V
CC
1 = 1V or
V
CC
2 = 1V
o
Power-Supply Transient Immunity
o
No External Components for Dual-Voltage
Systems
o
Small 5- and 6-Pin SOT23 Packages
o
Low Cost
MAX6351–MAX6360
__________Voltage Threshold Levels
PART NO.
SUFFIX
(_ _)
LT
LS
LR
MT
MS
MR
TZ
TY
TW
TV
SZ
SY
SW
SV
UW
UV
RW
V
CC
1 NOMINAL
VOLTAGE
THRESHOLD (V)
4.63
4.63
4.63
4.38
4.38
4.38
3.08
3.08
3.08
3.08
2.93
2.93
2.93
2.93
2.78
2.78
2.63
V
CC
2 NOMINAL
VOLTAGE
THRESHOLD (V)
3.08
2.93
2.63
3.08
2.93
2.63
2.32
2.19
1.67
1.58
2.32
2.19
1.67
1.58
1.67
1.58
1.67
Applications
Computers
Controllers
Portable/Battery-Powered
Equipment
Intelligent Instruments
Multivoltage Systems
Ordering Information
PART*
MAX6351_
_UT-T
MAX6352_
_UK-T
MAX6353_
_UK-T
MAX6354_
_UK-T
MAX6355_
_UT-T
MAX6356_
_UT-T
MAX6357_
_UT-T
MAX6358_
_UT-T
MAX6359_
_UT-T
MAX6360_
_UT-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
6 SOT23-6
5 SOT23-5
5 SOT23-5
5 SOT23-5
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
6 SOT23-6
RV
2.63
1.58
Note:
Standard versions are shown in bold. Sample stock is gen-
erally held on the standard versions only. Contact factory for avail-
ability.
*The
_ _ are placeholders for the threshold voltage levels of the
devices. Substitute the part number suffix in the Voltage Thres-
hold Levels table for the desired voltage level. All devices are
available in tape-and-reel only. There is a 2500 piece minimum
order increment for the SOT package.
Pin Configurations appear at end of data sheet.
Selector Guide appears at end of data sheet.
1
________________________________________________________________
Maxim Integrated Products
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
Dual/Triple-Voltage
µP Supervisory Circuits
MAX6351–MAX6360
ABSOLUTE MAXIMUM RATINGS
V
CC
1, V
CC
2 to GND .................................................-0.3V to +6V
RST
(MAX6352/MAX6355/MAX6358)...................... -0.3V to +6V
RST, MR,
WDI,
RST1,
RSTIN (MAX6351/MAX6353/
MAX6356/MAX6359) ..............................-0.3V to (V
CC
1 + 0.3V)
RST, RST2
(MAX6351/MAX6354/
MAX6357/MAX6360) ..............................-0.3V to (V
CC
2 + 0.3V)
Input/Output Current, All Pins .............................................20mA
Continuous Power Dissipation (T
A
= +70°C)
5-Pin SOT23 (derate 7.1mW/°C above +70°C)............571mW
6-Pin SOT23 (derate 8.7mW/°C above +70°C)............695mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature .....................................................+150°C
Storage Temperature Range .............................-65°C to +150°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
(V
CC
1 = V
CC
2 = +1.2V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Supply Voltage
Supply Current
SYMBOL
V
CC
1,
V
CC
2
I
CC
1 +
I
CC
2
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
V
CC
1 = 5.5V, V
CC
2 = 3.6V, all I/O pins open
MAX63_ _L_
MAX63_ _M_
MAX63_ _T_
V
CC
1 Threshold (Note 3)
V
TH
1
MAX63_ _S_
MAX63_ _U_
MAX63_ _R_
MAX63_ _ _T
MAX63_ _ _S
MAX63_ _ _R
V
CC
2 Threshold (Note 3)
V
TH
2
MAX63_ _ _Z
MAX63_ _ _Y
MAX63_ _ _W
MAX63_ _ _V
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
T
A
= +25°C
T
A
= -40°C to +85°C
4.54
4.5
4.3
4.25
3.03
3.00
2.88
2.85
2.74
2.70
2.58
2.55
3.03
3.00
2.88
2.85
2.58
2.55
2.28
2.25
2.16
2.13
1.64
1.62
1.55
1.53
1.58
1.67
2.19
2.32
2.63
2.93
3.08
2.63
2.78
2.93
3.08
4.38
MIN
1.0
1.2
20
4.63
TYP
MAX
5.5
5.5
50
4.72
4.75
4.46
4.50
3.14
3.15
2.98
3.00
2.82
2.85
2.68
2.70
3.14
3.15
2.98
3.00
2.68
2.70
2.35
2.38
2.22
2.25
1.70
1.71
1.61
1.62
V
V
UNITS
V
µA
2
_______________________________________________________________________________________
Dual/Triple-Voltage
µP Supervisory Circuits
MAX6351–MAX6360
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
1 = V
CC
2 = +1.2V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
Reset Threshold Tempco
Reset Threshold Hysteresis
V
CC
to Reset Delay
Reset Timeout Period
t
RP
100mV overdrive
V
CC
1 > V
TH
1
(MAX)
, V
CC
2 > V
TH
2
(MAX)
V
CC
1 or V
CC
2
≥
2.7V, I
SINK
= 1.2mA
V
CC
1 or V
CC
2
≥
4.5V, I
SINK
= 3.2mA
RESET
Output Voltage Low
V
OL
V
CC
1 or V
CC
2
≥
1V, I
SINK
= 50µA,
T
A
= 0°C to +70°C
V
CC
1 or V
CC
2
≥
1.2V, I
SINK
= 50µA;
T
A
= -40°C to +85°C
(_W, _V versions only),
I
SOURCE
= 350µA
V
CC
1 > V
TH
1
(MAX)
,
V
CC
2 > V
TH
2
(MAX)
V
OH
(_Y versions only),
V
CC
1 > V
TH
1
(MAX)
,
V
CC
2 > V
TH
2
(MAX)
I
SOURCE
= 500µA
0.8
×
V
CC
100
SYMBOL
∆V
TH
/°C
CONDITIONS
MIN
TYP
20
V
TH
/500
20
180
280
0.3
0.4
0.3
0.3
V
MAX
UNITS
ppm/°C
V
µs
ms
RESET
Output Voltage High
(MAX6351/MAX6353/MAX6354/
MAX6356/MAX6357/MAX6359/
MAX6360 only)
0.8
×
V
CC
V
(_T, _S, _R versions only),
I
SOURCE
= 800µA
V
CC
1 > V
TH
1
(MAX)
,
V
CC
2 > V
TH
2
(MAX)
WATCHDOG INPUT (MAX6358/MAX6359/MAX6360)
Watchdog Timeout Period
WDI Pulse Width (Note 4)
WDI Input Voltage (Note 5)
WDI Input Current (Note 6)
MANUAL RESET INPUT
V
IL
MR
Input Voltage
V
IH
V
IL
V
IH
MAX63_ _L_, MAX63_ _M_, V
CC
1 > V
TH
1
(MAX)
MAX63_ _L_, MAX63_ _M_, V
CC
1 > V
TH
1
(MAX)
MAX63_ _ _Y, V
CC
1 > V
TH
1
(MAX)
MAX63_ _ _Y, V
CC
1 > V
TH
1
(MAX)
t
WD
t
WDI
V
IL
V
IH
First timeout period after reset
After first WDI falling edge
V
IL
= 0.4V, V
IH
= 0.8 x V
CC
V
CC
1 = 5V
V
WDI
= V
CC
V
WDI
= 0
V
CC
- 1.5
25.6
1.6
50
46.4
2.9
72.0
4.5
0.3 x V
CC
s
ns
V
µA
0.7 x V
CC
120
-20
-15
0.8
2.3
0.3 x V
CC
0.7 x V
CC
160
V
_______________________________________________________________________________________
3
Dual/Triple-Voltage
µP Supervisory Circuits
MAX6351–MAX6360
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
1 = V
CC
2 = +1.2V to +5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.) (Note 1)
PARAMETER
MR
Pullup Resistance
MR
Minimum Pulse Width
MR
Glitch Rejection
MR
to Reset Delay
t
MD
V
CC
1 > V
TH
1
(MAX)
,
V
CC
2 > V
TH
2
(MAX)
T
A
= +25°C
T
A
= -40°C to +85°C
1.20
1.19
-25
2.5
ADJUSTABLE RESET COMPARATOR INPUT (MAX6355/MAX6356/MAX6357)
RSTIN Input Threshold
RSTIN Input Current
RSTIN Hysteresis
V
RSTIN
I
RSTIN
1.22
1.24
1.25
25
V
nA
mV
t
RP
SYMBOL
CONDITIONS
MIN
32
1
100
0.1
TYP
63.5
MAX
100
UNITS
kΩ
µs
ns
µs
0 < V
RSTIN
< V
CC
1 - 0.3V
Note 1:
Overtemperature limits are guaranteed by design and not production tested.
Note 2:
The reset output is guaranteed to be in the correct state if either V
CC
1 or V
CC
2 is within its specified region of operation.
Note 3:
The reset output(s) is asserted if either V
CC
1 or V
CC
2 drops below its associated trip point.
Note 4:
Guaranteed by design. Not production tested.
Note 5:
WDI is internally serviced within the watchdog timeout period if WDI is left unconnected.
Note 6:
The WDI input current is specified as the average input current when the WDI input is driven high or low.
Typical Operating Characteristics
(V
CC
1 = +5V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6351/60-01
RESET vs. V
CC
1 (V
CC
2 > V
TH
2)
MAX6351/60-02
RESET vs. V
CC
1 (V
CC
2 = GND)
4.5
4.0
3.5
RESET (V)
MAX6351/60-03
20
I
CC
1 (V
CC
1 = 5.0V, V
CC
2 = 3.3V)
SUPPLY CURRENT (µA)
15
I
CC
1 (V
CC
1 = 3.3V, V
CC
2 = 2.5V)
10
5.0
4.5
4.0
3.5
RESET (V)
3.0
2.5
2.0
1.5
1.0
V
TH
5.0
3.0
2.5
2.0
1.5
1.0
5
I
CC
2 (V
CC
1 = 5.0V, V
CC
2 = 3.3V)
I
CC
2 (V
CC
1 = 3.3V, V
CC
2 = 2.5V)
0.5
0
MAX6356L_
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
CC
1 (V)
85
0.5
0
0
0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0
V
CC
1 (V)
0
-40
-15
10
35
60
TEMPERATURE (°C)
4
_______________________________________________________________________________________
Dual/Triple-Voltage
µP Supervisory Circuits
Typical Operating Characteristics (continued)
(V
CC
1 = +5V, T
A
= +25°C, unless otherwise noted.)
NORMALIZED RESET/WATCHDOG
PERIOD vs. TEMPERATURE
MAX6351/60-04
MAX6351–MAX6360
MAXIMUM V
CC
TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE
MAX6351/60-05
RESET DELAY vs.
RESET THRESHOLD OVERDRIVE
MAX6351/60-06
1.20
1.15
NORMALIZED PERIOD
1.10
1.05
1.00
0.95
0.90
0.85
0.80
-60
-40
-20
0
20
40
60
80
300
RESET OCCURS ABOVE LINE
250
TRANSIENT DURATION (µs)
200
150
100
50
0
250
200
RESET DELAY (µs)
150
100
DELAY FROM FALL OF V
CC
2
50
DELAY FROM FALL OF V
CC
1
0
100
0.01
0.1
1
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
RESET THRESHOLD OVERDRIVE, V
RST
- V
CC
(V)
TEMPERATURE (°C)
RESET THRESHOLD OVERDRIVE, V
RST
- V
CC
(V)
PULLUP CHARACTERISTICS
MAX6351/60-07
MANUAL RESET INPUT TO
OUTPUT DELAY
MAX6351/60-08
5V
0
RST1 PUSH-PULL
OUTPUT
5V
MR
0
5V
OPEN-DRAIN
OUTPUT
R
PULLUP
= 100kΩ
C
LOAD
= 10pF
RST2 PUSH-PULL
OUTPUT
400ns/div
0
3V
0
OPEN-DRAIN
OUTPUT
R
PULLUP
= 100kΩ
C
LOAD
= 10pF
5V
0
RST2 PUSH-PULL
OUTPUT
RST1 PUSH-PULL
OUTPUT
40ns/div
5V
0
5V
0
_______________________________________________________________________________________
5
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