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MAX6392KA17+T

P1-P3P4-P6P7-P9
General Description
The MAX6391/MAX6392 microprocessor (µP) supervisory
circuits provide sequenced logic reset outputs for multi-
component or dual-voltage systems. Each device can
monitor two supply voltages and time-sequence two reset
outputs to control the order in which system components
are turned on and off. The MAX6391/MAX6392 increase
system reliability and reduce circuit complexity and cost
compared to separate ICs or discrete components.
The MAX6391/MAX6392 monitor V
CC
as the master
reset supply. Both RESET1 and RESET2 are asserted
whenever V
CC
drops below the selected factory-fixed
reset threshold voltage. RESET1 remains asserted as
long as V
CC
is below the threshold and deasserts
140ms (min) after V
CC
exceeds the thresholds.
RESET IN2 is monitored as the secondary reset supply
and is adjustable with an external resistive-divider net-
work. RESET2 is asserted whenever either V
CC
or
RESET IN2 is below the selected thresholds. RESET2
remains asserted 140ms (min) or a capacitor-
adjustable time period after V
CC
and RESET IN2
exceed their thresholds. RESET2 is always deasserted
after RESET1 during system power-up and is always
asserted before RESET1 during power-down.
The MAX6391 includes two internal pullup resistors for
RESET1 and RESET2 (the open-drain outputs can be
externally connected to the desired pullup voltages).
The MAX6392 includes an active-low manual reset
input (MR) that asserts both RESET1 (push-pull) and
RESET2 (open drain).
The MAX6391/MAX6392 are available in small 8-pin
SOT23 packages and are specified over the -40°C to
+85°C extended temperature range.
Applications
Computers
Controllers
Critical µP Power Monitoring
Set-Top Boxes
Printers
Servers/Workstations
Industrial Equipment
Multivoltage Monitoring
Features
♦ Preset V
CC
Reset Threshold Voltages from 1.58V
to 4.63V (master supply)
♦ Customer-Adjustable RESET IN2 to Monitor
Voltages Down to 625mV (secondary supply)
♦ Fixed (140ms min) RREESSEETT11 Timeout
♦ Fixed (140ms min) or Customer-Adjustable
RREESSEETT22 Timeout Period
♦ Guaranteed Reset Valid to V
CC
= 1V
♦ Active-Low Open-Drain Outputs or Push-
Pull/Open-Drain Combination
♦ Internal Open-Drain Pullup Resistors (for external
V
OH
voltage connections)
♦ Manual Reset Input (MAX6392 only)
♦ Immune to Short Negative V
CC
Transients
♦ 15µA Typical Supply Current
♦ Few External Components
♦ Small 8-Pin SOT23 Package
MAX6391/MAX6392
Dual-Voltage µP Supervisory Circuits
with Sequenced Reset Outputs
________________________________________________________________ Maxim Integrated Products 1
R2
RESET2GND
1
2
8
7
R1
RESET1V
CC
CSRT
RESET IN2
SOT23-8
TOP VIEW
3
4
6
5
MAX6391
Pin Configurations
Ordering Information
19-2210; Rev 2; 12/05
*Insert the desired suffix (see Selector Guide) into the blanks to
complete the part number. The MAX6391/MAX6392 require a
2.5k minimum order increment and are available in tape-and-
reel only. Samples are typically available for standard versions
(see Selector Guide for standard versions). Contact factory for
availability.
Devices are available in both leaded and lead-free packaging.
Specify lead-free by replacing “-T” with “+T” when ordering.
PART*
TEMP RANGE
PIN-PACKAGE
MAX6391KA_ _-T -40°C to +85°C
SOT23-8
MAX6392KA_ _-T -40°C to +85°C
SOT23-8
Pin Configurations continued at end of data sheet.
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.
Typical Operating Circuit appears at end of data sheet.
MAX6391/MAX6392
Dual-Voltage µP Supervisory Circuits
with Sequenced Reset Outputs
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= 1.2V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are at V
CC
= +5V and 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
to GND...........................................................-0.3V to +6.0V
RESET1 (MAX6392), RESET IN2, CSRT,
MR to GND ..............................................-0.3V to (V
CC
+ 0.3V)
RESET1 (MAX6391), RESET2, R1, R2 to GND......-0.3V to +6.0V
Input Current (V
CC
, GND, CSRT, R1, R2, MR) .................±20mA
Output Current (RESET1, RESET2) ..................................±20mA
Continuous Power Dissipation (T
A
= +70°C)
8-Pin SOT23 (derate 5.26mW/°C above +70°C)...........421mW
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
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX
UNITS
T
A
= 0°C to +85°C 1.0 5.5
V
CC
Range
T
A
= -40°C to +85°C 1.2 5.5
V
Supply Current I
CC
No load 15 25 µA
MAX639_UA46
4.50 4.63 4.75
MAX639_UA44
4.25 4.38 4.50
MAX639_UA31
3.00 3.08 3.15
MAX639_UA29
2.85 2.93 3.00
MAX639_UA26
2.55 2.63 2.70
MAX639_UA23
2.25 2.32 2.38
MAX639_UA22
2.12 2.19 2.25
MAX639_UA17
1.62 1.67 1.71
V
CC
Reset Threshold V
TH1
MAX639_UA16
1.54 1.58 1.61
V
RESET IN2 Threshold V
TH2
V
CC
= 5V
610 625 640
mV
RESET IN2 Input Current 50 nA
V
CC
to RESET1 Delay t
RD1
20
V
CC
or RESET IN2 to RESET2
Delay
t
RD2
V
CC
falling at 1mV/µs (Note 2)
10
µs
MAX6391/MAX6392
Dual-Voltage µP Supervisory Circuits
with Sequenced Reset Outputs
_______________________________________________________________________________________ 3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= 1.2V to 5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise specified. Typical values are at V
CC
= +5V and T
A
= +25°C.) (Note 1)
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
UNITS
RESET1 Timeout Period t
RP1
140 200 280
ms
C
CSRT
= 1500pF
2.2 3.1 4.0
RESET2 Timeout Period (Note 3)
t
RP2
C
CSRT
= V
CC
140 200 280
ms
V
CC
≥ 1.0V,
T
A
= 0°C to +85°C
0.3
I
SINK
= 50µA,
reset asserted
V
CC
≥ 1.2V,
T
A
= -40°C to +85°C
0.3
I
SINK
= 1.2mA, reset asserted, V
CC
≥ 2.5V 0.3
RESET_ Output Voltage Low V
OL
I
SINK
= 3.2mA, reset asserted, V
CC
≥ 4.25V 0.4
V
Open-Drain RESET Output
Leakage Current
I
LKG
V
CC
≥ V
TH1
, V
RESET IN2
≥ V
TH2
,
reset not asserted
1.0 µA
V
CC
≥ 2.25V, I
SOURCE
= 500µA,
reset not asserted
Push-Pull RESET1 Output
Voltage High (MAX6392 only)
V
OH
V
CC
≥ 4.5V, I
SOURCE
= 800µA, reset not
asserted
0.8 x
V
CC
V
V
IL
0.8
V
IH
V
CC
> 4.0V
2.4
V
IL
0.3 x
V
CC
MR Input
V
IH
V
CC
< 4.0V
0.7 x
V
CC
V
MR Minimum Pulse Width 50 µs
MR Glitch Rejection
100
ns
MR to RESET1 Delay t
MR1
10 µs
MR to RESET2 Delay t
MR2
100
ns
t
MR
Skew t
MR1
- t
MR2
10 µs
MR Pullup Resistance Pullup to V
CC
35 47 60 kΩ
Reset Pullup Resistance RESET1 to R1 or RESET2 to R2 35 47 60 kΩ
Note 1: Overtemperature limits are guaranteed by design and not production tested. Devices tested at +25°C only.
Note 2: RESET2 asserts before RESET1 when V
CC
goes below the threshold for all supply voltage and temperature ranges.
Note 3: CSRT must be connected to either V
CC
(for fixed RESET2 timeout period) or an external capacitor (for user-
adjustable RESET2 timeout period).
P1-P3P4-P6P7-P9

MAX6392KA17+T

Mfr. #:
Buy MAX6392KA17+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Dual uPower Reset Circuit
Lifecycle:
New from this manufacturer.
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