General Description
The MAX6736MAX6745 are low-power dual-/triple-
voltage microprocessor (P) supervisors. These
devices assert a reset if any monitored supply falls
below its factory-trimmed or adjustable threshold and
maintain reset for a minimum timeout period after all
supplies rise above their thresholds. The integrated
dual/triple supervisory circuits significantly reduce size
and power compared to separate ICs or discrete com-
ponents. The low supply current of 6A makes these
devices ideal for portable equipment.
The MAX6736/MAX6737 are dual fixed-voltage P
supervisors with a manual reset input. The MAX6738/
MAX6739 have one fixed and one adjustable reset
threshold and a manual reset input. The MAX6740/
MAX6743 are triple-voltage P supervisors with two
fixed and one user-adjustable reset threshold inputs.
The MAX6741/MAX6744 are dual-voltage P supervi-
sors with a power-OK (POK) output ideal for power-
supply sequencing. The MAX6742/MAX6745 monitor
the primary V
CC
supply and have an independent
power-fail comparator.
The MAX6736MAX6745 monitor I/O supply voltages
(V
CC
1) from 1.8V to 5.0V and core supply voltages
(V
CC
2) from 0.9V to 3.3V with factory-trimmed reset
threshold voltage options (Table 1). An external
adjustable RSTIN input option allows monitoring volt-
ages down to 0.5V.
A variety of push-pull or open-drain reset outputs along
with manual reset input and power-fail input/output fea-
tures are available (see the Selector Guide). The
MAX6736MAX6745 are offered in a space-saving 5-pin
SC70 package and operate over the -40C to +85C
temperature range.
Applications
Features
o Dual-/Triple-Supply Reset Voltage Monitors
o Precision Factory-Set Reset Thresholds for
Monitoring from 0.9V to 5.0V
o Adjustable Reset Input Down to 0.488V
o 150ms and 1200ms (min) Reset Timeout Period
Options
o V
CC
1 Power-OK Output for Power-Supply
Sequencing Applications (MAX6741/MAX6744)
o Power-Fail Input/Power-Fail Output
(MAX6742/MAX6745)
o 6A Supply Current
o Tiny SC70 Package
MAX6736MAX6745
Low-Power Dual-/Triple-Voltage SC70 P
Supervisory Circuits
________________________________________________________________ Maxim Integrated Products
1
PART
VOLTAGE
MONITORS
OPEN-DRAIN
RESET
PUSH-PULL
RESET
MANUAL
RESET
POWER-FAIL
INPUT/
OUTPUT
POK
OUTPUT
RSTIN
INPUT
MAX6736
2 fixed
X
--
X
--
--
--
MAX6737
2 fixed
--
X
X
--
--
--
MAX6738
1 fixed, 1 adj
X
--
X
--
--
X
Selector Guide
Ordering Information
19-2531; Rev 1; 4/03
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.
PART
TEMP RANGE
PIN-PACKAGE
MAX6736XK_ _D_-T
-40C to +85C
5 SC70-5
MAX6737XK_ _D_-T
-40C to +85C
5 SC70-5
Note: The first "_ _" or "_" are placeholders for the threshold
voltage levels of the devices. Desired threshold levels are set
by the part number suffix found in Tables 1 and 2. The "_" after
the D is a placeholder for the reset timeout period suffix found
in Table 3. For example, the MAX6736XKLTD3-T is a dual-volt-
age supervisor V
TH
1 = 4.625V, V
TH
2 = 3.075V, and a 150ms
minimum reset timeout period. All devices are available in
tape-and-reel only. There is a 2500-piece minimum order
increment for standard versions (see Table 1). Sample stock is
typically held on standard versions only. Nonstandard versions
require a minimum order increment of 10,000 pieces. Contact
factory for availability.
Portable/Battery-
Powered Equipment
Multivoltage Systems
Notebook Computers
Controllers
PDAs
GPS Equipment
POS Equipment
Ordering Information continued at end of data sheet.
Selector Guide continued at end of data sheet.
Pin Configurations appear at end of data sheet.
Typical Application Circuits appear at end of data sheet.
Functional Diagram appears at end of data sheet.
*Manual reset detect on
RESET output.
MAX6736MAX6745
Low-Power Dual-/Triple-Voltage SC70 P
Supervisory Circuits
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.2V to 5.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25
C.) (Note 1)
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.
V
CC
1
,
V
CC
2, POK1 to GND ......................................-0.3V to +6V
Open-Drain
RESET, PFO to GND.............................-0.3V to +6V
Push-Pull
RESET to GND..........................-0.3V to (V
CC
1 + 0.3V)
MR, RSTIN, PFI to GND............................-0.3V to (V
CC
1 + 0.3V)
Input/Output Current, All Pins .............................................20mA
Continuous Power Dissipation (T
A
= +70C)
5-Pin SC70 (derate 3.1mW/
C above +70C)..............247mW
Operating Temperature Range ...........................-40C to +85C
Junction Temperature ......................................................+150C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10s) .................................+300C
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= -40C to 0C
1.2
5.5
Operating Voltage Range
V
CC
1,
V
CC
2
T
A
= 0C to +85C
1.0
5.5
V
V
CC
1 = 3.3V, V
CC
1 > V
CC
2, no load, reset
not asserted
5
10
V
CC
1 Supply Current
I
CC
1
V
CC
1 = 1.8V, V
CC
1 < V
CC
2, no load, reset
not asserted
5
10
A
V
CC
2 = 1.8V, V
CC
2
< V
CC
1, no load, reset
not asserted
1
2
V
CC
2 Supply Current
I
CC
2
V
CC
2 = 3.3V, V
CC
2 > V
CC
1, no load, reset
not asserted
10
20
A
T
A
= 0C to +85C
4.500
4.625
4.750
MAX67_ _L
T
A
= -40C to +85C
4.425
4.825
T
A
= 0C to +85C
4.250
4.375
4.500
MAX67_ _M
T
A
= -40C to +85C
4.175
4.575
T
A
= 0C to +85C
3.000
3.075
3.150
MAX67_ _T
T
A
= -40C to +85C
2.950
3.200
T
A
= 0C to +85C
2.850
2.925
3.000
MAX67_ _S
T
A
= -40C to +85C
2.800
3.050
T
A
= 0C to +85C
2.550
2.625
2.700
MAX67_ _R
T
A
= -40C to +85C
2.505
2.745
T
A
= 0C to +85C
2.250
2.313
2.375
MAX67_ _Z
T
A
= -40C to +85C
2.213
2.413
T
A
= 0C to +85C
2.125
2.188
2.250
MAX67_ _Y
T
A
= -40C to +85C
2.088
2.288
T
A
= 0C to +85C
1.620
1.665
1.710
MAX67_ _W
T
A
= -40C to +85C
1.593
1.737
T
A
= 0C to +85C
1.530
1.575
1.620
Reset Threshold for V
CC
1
V
TH
1
MAX67_ _V
T
A
= -40C to +85C
1.503
1.647
V
MAX6736MAX6745
Low-Power Dual-/Triple-Voltage SC70 P
Supervisory Circuits
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.2V to 5.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25
C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
T
A
= 0C to +85C
3.000
3.075
3.150
MAX67_ _T
T
A
= -40C to +85C
2.905
3.050
T
A
= 0C to +85C
2.850
2.925
3.000
MAX67_ _S
T
A
= -40C to +85C
2.800
3.050
T
A
= 0C to +85C
2.550
2.625
2.700
MAX67_ _R
T
A
= -40C to +85C
2.505
2.745
T
A
= 0C to +85C
2.250
2.313
2.375
MAX67_ _Z
T
A
= -40C to +85C
2.213
2.413
T
A
= 0C to +85C
2.125
2.188
2.250
MAX67_ _Y
T
A
= -40C to +85C
2.088
2.288
T
A
= 0C to +85C
1.620
1.665
1.710
MAX67_ _W
T
A
= -40C to +85C
1.593
1.737
T
A
= 0C to +85C
1.530
1.575
1.620
MAX67_ _V
T
A
= -40C to +85C
1.503
1.647
T
A
= 0C to +85C
1.350
1.388
1.425
MAX67_ _I
T
A
= -40C to +85C
1.328
1.448
T
A
= 0C to +85C
1.275
1.313
1.350
MAX67_ _H
T
A
= -40C to +85C
1.253
1.373
T
A
= 0C to +85C
1.080
1.110
1.140
MAX67_ _G
T
A
= -40C to +85C
1.062
1.158
T
A
= 0C to +85C
1.020
1.050
1.080
MAX67_ _F
T
A
= -40C to +85C
1.002
1.098
T
A
= 0C to +85C
0.810
0.833
0.855
MAX67_ _E
T
A
= -40C to +85C
0.797
0.869
T
A
= 0C to + 85C
0.765
0.788
0.810
Reset Threshold for V
CC
2
V
TH
2
MAX67_ _D
T
A
= -40C to +85C
0.752
0.824
V
T
A
= 0C to +85C
0.476
0.488
0.500
RSTIN Threshold (MAX6738/
MAX6739/MAX6740/MAX6743)
V
TH-RSTIN
T
A
= -40C to +85C
0.468
0.507
V
RSTIN Input Current
V
RSTIN
0.1V (Note 2)
-10
+10
nA
Reset Threshold Hysteresis
V
TH
1, V
TH
2, RSTIN, PFI
0.5
%
V
CC
1
1.0V, I
SINK
= 50A, T
A
= 0C to
+85C
0.3
V
CC
1
1.2V, I
SINK
= 100A
0.3
V
CC
1
2.13V, I
SINK
= 1.2mA
0.3
RESET, POK1 Output Low
V
OL
V
CC
1
4.25V, I
SINK
= 3.2mA,
0.4
V
V
CC
1
2.38V, I
SOURCE
= 500A, output
deasserted
0.8
V
CC
RESET Output High (Push-Pull)
V
OH
V
CC
1
4.75V, I
SOURCE
= 800A, output
deasserted
0.8
V
CC
V
MAX6736MAX6745
Low-Power Dual-/Triple-Voltage SC70 P
Supervisory Circuits
4
_______________________________________________________________________________________
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.2V to 5.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25
C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
RESET Output Open-Drain
Leakage Current
(MAX6736/MAX6738)
I
LKG
Output not asserted low (Note 2)
500
nA
POK1 Output Open-Drain
Leakage
Output not asserted low (Note 2)
500
nA
V
CC
Reset Delay
t
RD
V
CC
1, V
CC
2, or RSTIN falling at 10mV/s
from V
TH
+ 100mV to V
TH
- 100mV
35
s
MAX67_ _ _ _ XK_ _D3
150
225
300
V
CC
Reset Timeout Period
(Note 3)
t
RP
MAX67_ _ _ _ XK_ _ D7
1200
1800
2400
ms
MANUAL RESET (MAX6736MAX6739 only)
MR to V
CC
1 Internal Pullup
Impedance
0.75
1.5
3.00
k
MR Timeout Period
t
MRP
Both D3 and D7 timing options
150
225
300
ms
MR Minimum Input Pulse Width
t
MPW
1
s
MR Glitch Rejection
100
ns
V
IL
0.3
V
CC
1
MR Input Voltage
V
IH
0.8
V
CC
1
V
MR to RESET Delay
300
ns
V
CC
1 POWER-OK OUTPUT (MAX6741/MAX6744 only)
POK1 Timeout Period
t
POKP
37.5
56.25
75.0
ms
PUSHBUTTON RESET (MAX6740/MAX6741/MAX6742 only)
RESET to V
CC
1 Internal Pullup
Impedance
25
50
100
k
Manual Reset Detect Debounce
Period
t
DEB
(Note 4)
37.5
56.25
75.0
ms
MAX67_ _ _ _ XK_ _D3
150
225
300
Manual Reset Timeout
Period (Note 3)
t
MRP
MAX67_ _ _ _ XK_ _ D7
1200
1800
2400
ms
Manual Reset Minimum Input
Pulse Width
t
MPW
(Note 4)
1
s
Manual Reset Release Detect
Threshold
(Note 4)
0.5
V
CC
1
V
Manual Reset Glitch Rejection
(Note 4)
100
ns
Manual Reset to
RESET Delay
300
ns
MAX6736MAX6745
Low-Power Dual-/Triple-Voltage SC70 P
Supervisory Circuits
_______________________________________________________________________________________
5
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.2V to 5.5V, T
A
= -40C to +85C, unless otherwise noted. Typical values are at T
A
= +25
C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
POWER-FAIL COMPARATOR (MAX6742/MAX6745 only)
T
A
= 0C to +85C
0.476
0.488
0.500
Power Fail In Threshold (Note 5)
V
TH-PFI
T
A
= -40C to +85C
0.468
0.507
V
Power Fail In Current
I
PFI
V
PFI
0.1V (Note 2)
-10
+10
nA
V
CC
1
1.53V, I
SINK
= 500A
0.3
V
CC
1
2.03V, I
SINK
= 1.2mA
0.3
PFO Output Low
V
OL
V
CC
1
4.25V, I
SINK
= 3.2mA
0.4
V
PFI to
PFO Propagation Delay
t
P
PFI falling at 10mV/s from V
TH-PFI
+
100mV to V
TH-PFI
- 100mV or rising at
10mV/s from V
TH-PFI
- 100mV to V
TH-PFI
+
100mV (Note 5)
35
s
PFO Startup Delay
To output valid (Note 5)
5
ms
Note 1: All devices are 100% tested at T
A
= +25C. All temperature limits are guaranteed by design.
Note 2: Guaranteed by design.
Note 3: t
RD
timeout period begins after POK1 timeout period (t
POKP
) and V
CC
2
V
TH
2 (max) (MAX6741/MAX6744).
Note 4: Refers to the manual reset function obtained by forcing the RESET output low.
Note 5: V
CC
1
1.6V.
Typical Operating Characteristics
(T
A
= +25C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6736-45 toc01
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
40
20
0
-20
1
2
3
4
5
6
7
8
9
10
0
-40
80
V
CC
1 = 3.3V, V
CC
2 = 2.5V
TOTAL
I
CC
1
I
CC
2
SUPPLY CURRENT vs. TEMPERATURE
MAX6736-45 toc02
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
40
20
0
-20
1
2
3
4
5
6
7
8
9
10
0
-40
80
V
CC
1 = 2.5V, V
CC
2 = 1.8V
TOTAL
I
CC
1
I
CC
2
SUPPLY CURRENT vs. TEMPERATURE
MAX6736-45 toc03
TEMPERATURE (
C)
SUPPLY CURRENT (
A)
60
40
20
0
-20
1
2
3
4
5
6
7
8
9
10
0
-40
80
V
CC
1 = 1.8V, V
CC
2 = 1.2V
TOTAL
I
CC
1
I
CC
2
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