19-2531; Rev 2; 12/05
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
General Description
The MAX6736–MAX6745 are low-power dual-/triple-
voltage microprocessor (µP) 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 6µA makes these
devices ideal for portable equipment.
The MAX6736/MAX6737 are dual fixed-voltage µP
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 µP supervisors with two
fixed and one user-adjustable reset threshold inputs.
The MAX6741/MAX6744 are dual-voltage µP 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 MAX6736–MAX6745 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
MAX6736–MAX6745 are offered in a space-saving 5-pin
SC70 package and operate over the -40°C to +85°C
temperature range.
Features
♦
Dual-/Triple-Supply Reset Voltage Monitors
♦
Precision Factory-Set Reset Thresholds for
Monitoring from 0.9V to 5.0V
♦
Adjustable Reset Input Down to 0.488V
♦
150ms and 1200ms (min) Reset Timeout Period
Options
♦
V
CC
1 Power-OK Output for Power-Supply
Sequencing Applications (MAX6741/MAX6744)
♦
Power-Fail Input/Power-Fail Output
(MAX6742/MAX6745)
♦
6µA Supply Current
♦
Tiny SC70 Package
MAX6736–MAX6745
Ordering Information
PART
MAX6736XK_
_D_-T
MAX6737XK_
_D_-T
TEMP RANGE
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
5 SC70-5
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.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
Ordering Information and Selector Guide continued at end
of data sheet.
Pin Configurations, Typical Application Circuits, and
Functional Diagram appear at end of data sheet.
Applications
Portable/Battery-
Powered Equipment
Multivoltage Systems
Notebook Computers
Controllers
PDAs
GPS Equipment
POS Equipment
Selector Guide
PART
MAX6736
MAX6737
MAX6738
VOLTAGE
MONITORS
2 fixed
2 fixed
1 fixed, 1 adj
OPEN-DRAIN
RESET
X
—
X
PUSH-PULL
RESET
—
X
—
MANUAL
RESET
X
X
X
POWER-FAIL
INPUT/
OUTPUT
—
—
—
POK
OUTPUT
—
—
—
RSTIN
INPUT
—
—
X
*Manual
reset detect on
RESET
output.
________________________________________________________________
Maxim Integrated Products
1
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.
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
MAX6736–MAX6745
ABSOLUTE MAXIMUM RATINGS
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
= +70°C)
5-Pin SC70 (derate 3.1mW/°C above +70°C) ..............247mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°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
= 1.2V to 5.5V, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C.)
(Note 1)
PARAMETER
Operating Voltage Range
SYMBOL
V
CC
1,
V
CC
2
CONDITIONS
T
A
= -40°C to 0°C
T
A
= 0°C to +85°C
V
CC
1 = 3.3V, V
CC
1 > V
CC
2, no load, reset
not asserted
V
CC
1 Supply Current
I
CC
1
V
CC
1 = 1.8V, V
CC
1 < V
CC
2, no load, reset
not asserted
V
CC
2 = 1.8V, V
CC
2 < V
CC
1, no load, reset
not asserted
V
CC
2 Supply Current
I
CC
2
V
CC
2 = 3.3V, V
CC
2 > V
CC
1, no load, reset
not asserted
MAX67_ _L
MAX67_ _M
MAX67_ _T
MAX67_ _S
Reset Threshold for V
CC
1
V
TH
1
MAX67_ _R
MAX67_ _Z
MAX67_ _Y
MAX67_ _W
MAX67_ _V
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
4.500
4.425
4.250
4.175
3.000
2.950
2.850
2.800
2.550
2.505
2.250
2.213
2.125
2.088
1.620
1.593
1.530
1.503
1.575
1.665
2.188
2.313
2.625
2.925
3.075
4.375
MIN
1.2
1.0
5
5
1
10
4.625
TYP
MAX
5.5
5.5
10
µA
10
2
µA
20
4.750
4.825
4.500
4.575
3.150
3.200
3.000
3.050
2.700
2.745
2.375
2.413
2.250
2.288
1.710
1.737
1.620
1.647
V
UNITS
V
2
_______________________________________________________________________________________
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
MAX6736–MAX6745
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 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
Output Open-Drain
Leakage Current
(MAX6736/MAX6738)
POK1 Output Open-Drain
Leakage
V
CC
Reset Delay
V
CC
Reset Timeout Period
(Note 3)
MR
to V
CC
1 Internal Pullup
Impedance
MR
Timeout Period
MR
Minimum Input Pulse Width
MR
Glitch Rejection
V
IL
MR
Input Voltage
V
IH
MR
to
RESET
Delay
V
CC
1 POWER-OK OUTPUT (MAX6741/MAX6744 only)
POK1 Timeout Period
RESET
to V
CC
1 Internal Pullup
Impedance
Manual Reset Detect Debounce
Period
Manual Reset Timeout
Period (Note 3)
Manual Reset Minimum Input
Pulse Width
Manual Reset Release Detect
Threshold
Manual Reset Glitch Rejection
Manual Reset to
RESET
Delay
t
DEB
t
MRP
t
MPW
(Note 4)
MAX67_ _ _ _ XK_ _D3
MAX67_ _ _ _ XK_ _ D7
(Note 4)
(Note 4)
(Note 4)
t
POKP
37.5
56.25
75.0
ms
PUSHBUTTON RESET (MAX6740/MAX6741/MAX6742 only)
25
37.5
150
1200
1
0.5
×
V
CC
1
100
300
50
56.25
225
1800
100
75.0
300
2400
kΩ
ms
ms
µs
V
ns
ns
0.8
×
V
CC
1
300
t
MRP
t
MPW
Both D3 and D7 timing options
t
RD
t
RP
SYMBOL
I
LKG
CONDITIONS
Output not asserted low (Note 2)
MIN
TYP
MAX
500
UNITS
nA
Output not asserted low (Note 2)
V
CC
1, V
CC
2, or RSTIN falling at 10mV/µs
from V
TH
+ 100mV to V
TH
- 100mV
MAX67_ _ _ _ XK_ _D3
MAX67_ _ _ _ XK_ _ D7
150
1200
35
225
1800
500
nA
µs
300
2400
ms
MANUAL RESET (MAX6736–MAX6739 only)
0.75
150
1
100
0.3
×
V
CC
1
1.5
225
3.00
300
kΩ
ms
µs
ns
V
ns
4
_______________________________________________________________________________________
Low-Power Dual-/Triple-Voltage SC70 µP
Supervisory Circuits
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 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
SYMBOL
CONDITIONS
T
A
= 0°C to +85°C
T
A
= -40°C to +85°C
V
PFI
≥
0.1V (Note 2)
V
CC
1
≥
1.53V, I
SINK
= 500µA
PFO
Output Low
V
OL
V
CC
1
≥
2.03V, I
SINK
= 1.2mA
V
CC
1
≥
4.25V, I
SINK
= 3.2mA
PFI falling at 10mV/µs from V
TH-PFI
+
100mV to V
TH-PFI
- 100mV or rising at
10mV/µs from V
TH-PFI
- 100mV to V
TH-PFI
+
100mV (Note 5)
To output valid (Note 5)
MIN
0.476
0.468
-10
TYP
0.488
MAX
0.500
0.507
+10
0.3
0.3
0.4
V
UNITS
POWER-FAIL COMPARATOR (MAX6742/MAX6745 only)
Power Fail In Threshold (Note 5)
Power Fail In Current
V
TH-PFI
I
PFI
V
nA
MAX6736–MAX6745
PFI to
PFO
Propagation Delay
t
P
35
µs
PFO
Startup Delay
5
ms
Note 1:
Note 2:
Note 3:
Note 4:
Note 5:
All devices are 100% tested at T
A
= +25°C. All temperature limits are guaranteed by design.
Guaranteed by design.
t
RD
timeout period begins after POK1 timeout period (t
POKP
) and V
CC
2
≥
V
TH
2 (max) (MAX6741/MAX6744).
Refers to the manual reset function obtained by forcing the RESET output low.
V
CC
1
≥
1.6V.
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. TEMPERATURE
MAX6736-45 toc01
SUPPLY CURRENT vs. TEMPERATURE
MAX6736-45 toc02
SUPPLY CURRENT vs. TEMPERATURE
9
8
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
I
CC
2
I
CC
1
TOTAL
V
CC
1 = 1.8V, V
CC
2 = 1.2V
MAX6736-45 toc03
10
9
8
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
I
CC
2
TOTAL
I
CC
1
V
CC
1 = 3.3V, V
CC
2 = 2.5V
10
9
8
SUPPLY CURRENT (µA)
7
6
5
4
3
2
1
0
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
I
CC
2
TOTAL
I
CC
1
V
CC
1 = 2.5V, V
CC
2 = 1.8V
10
-40
-20
0
20
40
60
80
TEMPERATURE (°C)
_______________________________________________________________________________________
5
Analog electronics
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