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MAX6315US26D1+T

P1-P3P4-P6P7-P7
MAX6315
Open-Drain SOT µP Reset Circuit
General Description
The MAX6315 low-power CMOS microprocessor (µP)
supervisory circuit is designed to monitor power sup-
plies in µP and digital systems. It provides excellent cir-
cuit reliability and low cost by eliminating external
components and adjustments. The MAX6315 also pro-
vides a debounced manual reset input.
This device performs a single function: it asserts a reset
signal whenever the V
CC
supply voltage falls below a
preset threshold or whenever manual reset is asserted.
Reset remains asserted for an internally programmed
interval (reset timeout period) after V
CC
has risen above
the reset threshold or manual reset is deasserted. The
MAX6315’s open-drain RESET output can be pulled up
to a voltage higher than V
CC
.
The MAX6315 comes with factory-trimmed reset thresh-
old voltages in 100mV increments from 2.5V to 5V.
Preset timeout periods of 1ms, 20ms, 140ms, and
1120ms (min) are also available. The device comes in a
SOT143 package.
For microcontrollers (µCs) and µPs with bidirectional
reset pins, see the MAX6314 data sheet.
Applications
Computers
Controllers
Intelligent Instruments
Critical µP and µC Power Monitoring
Portable/Battery-Powered Equipment
Benefits and Features
• Supervisory Circuit Ensures Reliable System
Operation with Minimal Power Consumption
• Precision, Factory-Set V
CC
Reset Thresholds:
100mV Increments from 2.5V to 5V
• Four Reset Timeout Periods Available:
1ms, 20ms, 140ms, or 1120ms (min)
• Immune to Short V
CC
Transients
• Open-Drain RESET Output Can Exceed V
CC
•
Guaranteed Over Temperature
• 5µA Supply Current
• Pin Compatible with MAX811
• Saves Space
• 4-Pin SOT143 Package
1
2
4
3
V
CC
MRRESET
GND
MAX6315
SOT143
TOP VIEW
Pin Configuration
MAX6315
V
CC
V
CC
GND
RESET
μP
RESET
MR
LASER-
TRIMMED
RESISTORS
RESET
CIRCUITRY
Typical Operating Circuit
Ordering Information continued at end of data sheet.
PART
†
NOMINAL
V
TH
(V)
MIN t
RP
(ms)
TOP
MARK
††
MAX6315US50D1-T 5.00 1 FX_ _
Ordering Information
†
The MAX6315 is available in a SOT143 package, -40°C to
+125°C temperature range.
††
The first two letters in the package top mark identify the part,
while the remaining two letters are the lot tracking code.
Devices are available in both leaded and lead-free packaging.
Specify lead(Pb)-free by replacing “-T” with “+T” when ordering.
Note: All devices available in tape-and-reel only. Contact
factory for availability.
19-2000; Rev 4; 4/15
MAX6315
Open-Drain SOT µP Reset Circuit
Maxim Integrated | 2www.maximintegrated.com
Absolute Maximum Ratings
Electrical Characteristics
(V
CC
= +2.5V to +5.5V, T
A
= -40°C to +125°C, unless otherwise noted. Typical values are at T
A
= +25°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.
Note 1: The MAX6315 monitors V
CC
through an internal factory-trimmed voltage-divider that programs the nominal reset threshold.
Factory-trimmed reset thresholds are available in 100mV increments from 2.5V to 5V (see the
Ordering Information
).
V
CC
........................................................................-0.3V to +6.0V
RESET....................................................................-0.3V to +6.0V
All Other Pins..............................................-0.3V to (V
CC
+ 0.3V)
Input Current (V
CC
).............................................................20mA
Output Current (RESET)......................................................20mA
Rate of Rise (V
CC
) ...........................................................100V/µs
Continuous Power Dissipation (T
A
= +70°C)
SOT143 (derate 4mW/°C above +70°C)........................320mW
Operating Temperature Range .........................-40°C to +125°C
Storage Temperature Range .............................-65°C to +160°C
Lead Temperature (soldering, 10s) .................................+300°C
MAX6315US_ _D2-T (-40°C to +85°C)
MAX6315US_ _D1-T (-40°C to +125°C)
MAX6315US_ _D2-T (-40°C to +125°C)
T
A
= +25°C
V
CC
> 1.2V, I
SINK
= 0.5mA
V
CC
= 3.6V, no load (-40°C to +85°C)
V
CC
= 5.5V, no load (-40°C to +85°C)
15
T
A
= -40°C to +85°C
V
TH
- 2.5% V
TH
+ 2.5%
16 48
20 28 40
0.8 2.4
V
CC
> V
TH
, RESET deasserted
V
TH
> 4.0V
V
CC
= falling at 1mV/µs
MAX6315US_ _D1-T (-40°C to +85°C)
V
CC
> 4.25V, I
SINK
= 3.2mA
CONDITIONS
V
CC
> 2.5V, I
SINK
= 1.2mA
V
CC
> 1.0V, I
SINK
= 80µA
0.3 x V
CC
2.4
0.7 x V
CC
0.3
0.3
0.3
V
12
T
A
= -40°C to +125°C
410
MAX6315US_ _D4-T (-40°C to +85°C)
MAX6315US_ _D3-T (-40°C to +125°C)
V
CC
= 3.6V, no load (-40°C to +125°C)
V
TH
- 3.5% V
TH
+ 3.5%
MAX6315US_ _D4-T (-40°C to +125°C) 896 2688
1120 1570 2240
112 336
MAX6315US_ _D3-T (-40°C to +85°C) 140 200 280
µA1
RESET Output Leakage Current
V
0.4
V
OL
RESET Output Voltage
kΩ32 63 100
MR Pullup Resistance
V
TH
- 1.8% V
TH
V
TH
+ 1.8%
V
TH
Reset Threshold (Note 1)
µA
512
I
CC
V1.0 5.5V
CC
Operating Voltage Range
V
CC
Supply Current
ns500
MR to Reset Delay
ns100
MR Glitch Rejection
µs1
MR Minimum Input Pulse
V
0.8
V
IL
MR Input Threshold
ppm/°C60ΔV
TH
/°CReset Threshold Tempco
µs35V
CC
to Reset Delay
ms
1 1.4 2
t
RP
Reset Timeout Period
UNITSMIN TYP MAXSYMBOLPARAMETER
V
IL
V
IH
V
IH
V
CC
= 5.5V, no load (-40°C to +125°C)
T
A
= -40°C to +85°C
V
TH
< 4.0V
MANUAL RESET INPUT
6
0
-50 -30 30 90
2
1
5
MAX6315-01
TEMPERATURE (°C)
SUPPLY CURRENT (μA)
-10 10 50
3
4
70
V
CC
= 5V
V
CC
= 3V
V
CC
= 1V
SUPPLY CURRENT vs. TEMPERATURE
6
0
0
1
35
SUPPLY CURRENT
vs. SUPPLY VOLTAGE
2
1
5
MAX6315-02
SUPPLY VOLTAGE (V)
SUPPLY CURRENT (μA)
2
3
4
4
T
A
= -40
°
C
T
A
= +25
°
C
T
A
= +85
°
C
50
0
-50 -30 10 90
POWER-DOWN RESET DELAY
vs. TEMPERATURE
10
40
MAX6315-03
TEMPERATURE (°C)
POWER-DOWN RESET DELAY (μs)
-10
20
30
30 50 70
V
CC
FALLING AT 1mV/μs
V
TH
= 4.63V
V
TH
= 3.00V
1.04
0.96
-50 -30 10 90
NORMALIZED RESET TIMEOUT PERIOD
vs. TEMPERATURE (V
CC
RISING)
0.97
0.98
1.02
1.00
1.03
MAX6315-04
TEMPERATURE (°C)
NORMALIZED RESET TIMEOUT PERIOD
-10
0.99
1.01
30 50 70
1.006
0.994
-50 -30 10 90
NORMALIZED RESET THRESHOLD
vs. TEMPERATURE (V
CC
FALLING)
0.996
0.998
1.004
1.000
MAX6315-05
TEMPERATURE (°C)
NORMALIZED RESET THRESHOLD
-10
1.002
30 50 70
100
0
10 100 1000
MAXIMUM TRANSIENT DURATION
vs. RESET COMPARATOR OVERDRIVE
20
MAX6315-06
RESET COMP. OVERDRIVE, V
TH
- V
CC
(mV)
MAXIMUM TRANSIENT DURATION (μs)
40
60
80
T
A
= +25
°
C
RESET OCCURS
ABOVE CURVE
V
TH
= 4.63V
V
T
= 3.00V
MAX6315
Open-Drain SOT µP Reset Circuit
Maxim Integrated | 3www.maximintegrated.com
Pin Description
NAME FUNCTION
1 GND Ground
2
RESET
Active-Low Open-Drain Output. Connect to an external pullup resistor. Can be pulled up to a voltage
higher than V
CC
, but less than 6V.
PIN
3
MR
Manual Reset Input. A logic-low on MR asserts reset. Reset remains asserted as long as MR is low, and
for the reset timeout period (t
RP
) after the reset conditions are terminated. Connect to V
CC
if not used.
4 V
CC
Supply Voltage and Reset Threshold Monitor Input
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
P1-P3P4-P6P7-P7

MAX6315US26D1+T

Mfr. #:
Buy MAX6315US26D1+T
Manufacturer:
Maxim Integrated
Description:
Supervisory Circuits Open-Drain uPower Reset Circuit
Lifecycle:
New from this manufacturer.
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