MAXIM MAX6453, MAX6456 Technical data
General Description
The MAX6453–MAX6456 are low-power, dual-voltage
µP supervisors featuring separate VCCreset and manual reset outputs. The dual outputs support both softsystem reset (interrupt) and hard-system reset (reboot)
functions. The reset output asserts when any of the
monitored voltages falls below its specified threshold
and remains asserted for the reset timeout (140ms min)
after all voltages exceed their respective reset thresholds. All devices are offered with nine factory-fixed
reset thresholds for monitoring primary system voltages
(VCC) from 1.8V to 5V and an adjustable reset input for
monitoring a secondary system voltage down to 0.63V.
Each device has a manual reset input, a VCCreset output, and a manual reset output. The MAX6453/
MAX6454 manual reset output asserts when the manual
reset input is low. It remains asserted for the manual
reset timeout period (140ms min) after the manual reset
input transitions high. The MAX6453/MAX6354 manual
reset input controls only the manual reset output and
does not affect the VCCreset output.
The manual reset input of the MAX6455/MAX6456 controls both the manual reset and VCCreset outputs. When
the manual reset input is low for less than 3.3s (typ), only
the manual reset output asserts and remains asserted for
the manual reset timeout period (140ms min) after the
manual reset input transitions high. If the manual reset
input is low for at least 3.3s (typ), the reset output also
asserts and remains asserted for the reset timeout period (140ms min) after the manual reset input transitions
high. This enhanced feature allows the implementation of
a soft/hard-system reset combination.
The MAX6453/MAX6455 have active-low push-pull
reset and manual reset outputs, and the MAX6454/
MAX6456 have active-low open-drain reset and manual
reset outputs. All devices are available in small SOT236 packages and are fully specified over the extended
temperature range (-40°C to +85°C).
Applications
Set-Top Boxes
Consumer Electronics
DVD Players
Modems
MP3 Players
Industrial Equipment
Automotive
Medical Devices
Features
♦ Precision Factory-Set Reset Thresholds From
1.6V to 4.6V
♦ Adjustable Threshold to Monitor Voltages Down
to 0.63V
♦ Manual Reset Input with Extended 3.36s Setup
Period
♦ Immune to Short Voltage Transients
♦ Low 6µA Supply Current
♦ Guaranteed Valid Reset Down to V
CC
= 1.0V
♦ Active-Low RESET (Push-Pull or Open-Drain)
Outputs
♦ 140ms (min) Reset Timeout Period
♦ Small SOT Package
MAX6453–MAX6456
µP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
________________________________________________________________ Maxim Integrated Products 1
Pin Configurations
Ordering Information
19-2637; 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.
Note: The “_” is a placeholder for the threshold voltage level of
the devices. A desired threshold level is set by the part number suffix found in Table 1. All devices are available in tapeand-reel only. There is a 2500-piece minimum order increment
for standard versions (Table 2). Sample stock is typically held
on standard versions only. Nonstandard versions require a
minimum order increment of 10,000 pieces. Contact factory for
availability.
Selector Guide appears at end of data sheet.
PART TEMP RANGE PIN-PACKAGE
MAX6453UT_ _S-T -40°C to +85°C 6 SOT23-6
MAX6454UT_ _S-T -40°C to +85°C 6 SOT23-6
MAX6455UT_ _S-T -40°C to +85°C 6 SOT23-6
MAX6456UT_ _S-T -40°C to +85°C 6 SOT23-6
TOP VIEW
RESET
GND
MROUT
16MR
MAX6453
2
MAX6454
34
SOT23-6
5 RSTIN
V
CC
16MR
RESET
GND
2
34
MROUT
MAX6455
MAX6456
SOT23-6
5 RSTIN
V
CC
MAX6453–MAX6456
µP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
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.
(All voltages referenced to GND)
V
CC
..........................................................................-0.3V to +6V
Open-Drain RESET, MROUT ....................................-0.3V to +6V
Push-Pull RESET, MROUT..........................-0.3V to (V
CC
+ 0.3V)
MR, RSTIN ...............................................................-0.3V to +6V
Input Current, All Pins.......................................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C).............696mW
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
ELECTRICAL CHARACTERISTICS
(VCC= 1.0V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
Operating Voltage Range V
VCC Supply Current I
VCC Reset Threshold V
Reset Threshold Tempco 60 ppm/°C
Reset Threshold Hysteresis 2 × V
RSTIN Threshold V
RSTIN Threshold Hysteresis V
RSTIN Input Current I
RSTIN to Reset Output Delay V
Reset Timeout Period t
VCC to RESET Output Delay t
MR Minimum Setup Period
(Pulse Width)
MR Minimum Input Pulse RESET asserted, MAX6455/MAX6456 2.24 3.36 4.48 s
MR Glitch Rejection 100 ns
MR to MROUT Delay 200 ns
Manual Reset Timeout Period t
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
CC
CC
TH
TH-RSTIN
HYST
RSTIN
RP
RD
t
MR
MRP
VCC = 5.5V, no load 7 20
VCC = 3.6V, no load 6 16
46 4.50 4.63 4.75
44 4.25 4.38 4.50
31 3.00 3.08 3.15
29 2.85 2.93 3.00
26 2.55 2.63 2.70
23 2.25 2.32 2.38
22 2.12 2.19 2.25
17 1.62 1.67 1.71
16 1.52 1.58 1.62
TA = 0°C to +85°C 0.615 0.630 0.645
TA = -40°C to +85°C 0.610 0.650
falling at 1mV/µs 15 µs
RSTIN
VCC falling at 1mV/µs 20 µs
MR to MROUT 1µs
1.0 5.5 V
TH
2.5 mV
-25 +25 nA
140 210 280 ms
140 210 280 ms
µA
V
mV
V
MAX6453–MAX6456
µP Supervisors with Separate V
CC
Reset and
Manual Reset Outputs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(VCC= 1.0V to 5.5V, TA= -40°C to +85°C, unless otherwise specified. Typical values are at TA= +25°C.) (Note 1)
Note 1: Devices production tested at 25°C. Overtemperature limits are guaranteed by design.
MR to VCC Pullup Impedance 25 50 75 kΩ
RESET, MROUT Output Low
(Open Drain or Push-Pull)
RESET, MROUT Output High
(Push-Pull)
RESET, MROUT Output
Open-Drain Leakage Current
MR Input Low Voltage V
MR Input High Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
V
V
I
LKG
OL
OH
IL
IH
VCC ≥ 1.00V, I
asserted
VCC ≥ 1.20V, I
asserted
VCC ≥ 2.55V, I
asserted
VCC ≥ 4.25V, I
asserted
VCC ≥ 1.80V, I
outputs deasserted
VCC ≥ 3.15V, I
outputs deasserted
VCC ≥ 4.75V, I
outputs deasserted
Outputs deasserted 1 µA
= 50µA, outputs
SINK
= 100µA, outputs
SINK
= 1.2mA, outputs
SINK
= 3.2mA, outputs
SINK
= 200µA,
SOURCE
= 500µA,
SOURCE
= 800µA,
SOURCE
0.8 × V
0.8 × V
0.8 × V
0.7 × V
CC
CC
CC
CC
0.3
0.3
0.3
0.4
0.3 × V
CC
V
V
V
V
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