Maxim MAX6326R31-T 3-pin, ultra-low-power sc70/sot î¼p reset circuit Datasheet

19-1294; Rev 3; 1/00
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
These circuits perform a single function: they assert a
reset signal whenever the VCC supply voltage declines
below a preset threshold, keeping it asserted for at least
100ms after VCC has risen above the reset threshold.
The only difference between the devices is their output.
The MAX6326/MAX6346 (push-pull) and MAX6328/
MAX6348 (open-drain) have an active-low reset output.
The MAX6327/MAX6347 have an active-high push-pull
reset output. All of these parts are guaranteed to be in
the correct state for VCC down to 1V. The reset comparator is designed to ignore fast transients on VCC. Reset
thresholds are factory-trimmable between 2.2V and
4.63V, in approximately 100mV increments. Twenty-one
standard versions are available. Contact the factory for
availability of nonstandard versions.
Ultra-low supply currents (1µA max for the MAX6326/
MAX6327/MAX6328) make these parts ideal for use in
portable equipment. All six devices are available in
space-saving SOT23 and SC70 packages.
Applications
Computers
Intelligent Instruments
Controllers
Automotive
Critical µP and µC
Power Monitoring
Portable/Battery-Powered
Equipment
Pin Configuration
TOP VIEW
GND
1
MAX6326
MAX6327
MAX6328
MAX6346
MAX6347
MAX6348
(RESET) RESET
3
VCC
Features
♦ Ultra-Low 1µA (max) Supply Current
(MAX6326/MAX6327/MAX6328)
♦ Precision Monitoring of 2.5V, 3V, 3.3V, and 5V
Power-Supply Voltages
♦ Reset Thresholds Available from 2.2V to 4.63V
♦ Fully Specified Over Temperature
♦ 100ms (min) Power-On Reset Pulse Width
♦ Low Cost
♦ Available in Three Versions: Push-Pull RESET,
Push-Pull RESET, and Open-Drain RESET
♦
♦
♦
♦
Power-Supply Transient Immunity
No External Components
3-Pin SC70/SOT23 Packages
Pin Compatible with MAX803/MAX809/MAX810
Ordering Information
PART†
TEMP. RANGE
PIN-PACKAGE
MAX6326XR_ _-T
-40°C to +85°C
3 SC70-3
MAX6326UR_ _-T
-40°C to +85°C
3 SOT23-3
MAX6327XR_ _-T
-40°C to +85°C
3 SC70-3
MAX6327UR_ _-T
MAX6328XR_ _-T
MAX6328UR_ _-T
MAX6346XR_ _-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
3 SOT23-3
3 SC70-3
3 SOT23-3
3 SC70-3
MAX6346UR_ _-T
-40°C to +85°C
3 SOT23-3
MAX6347XR_ _-T
-40°C to +85°C
3 SC70-3
MAX6347UR_ _-T
MAX6348XR_ _-T
MAX6348UR_ _-T
-40°C to +85°C
-40°C to +85°C
-40°C to +85°C
3 SOT23-3
3 SC70-3
3 SOT23-3
†The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/
MAX6348 are available in factory-set VCC reset thresholds from
2.2V to 4.63V, in approximately 0.1V increments. Choose the
desired reset-threshold suffix from Table 1 and insert it in the
blank spaces following “R.” There are 21 standard versions with
a required order increment of 2500 pieces. Sample stock is generally held on the standard versions only (see the Selector
Guide). Required order increment is 10,000 pieces for nonstandard versions (Table 2). Contact factory for availability. All
devices available in tape-and-reel only.
Selector Guide appears at end of data sheet.
2
SOT23-3/SC70-3
( ) ARE FOR THE MAX6327/MAX6347.
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
General Description
The MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/
MAX6348 microprocessor (µP) supervisory circuits monitor the power supplies in µP and digital systems. These
devices provide excellent circuit reliability and low cost
by eliminating external components and adjustments
when used with 2.5V, 3V, 3.3V, and 5V powered circuits.
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
ABSOLUTE MAXIMUM RATINGS
Terminal Voltage (with respect to GND)
VCC ...........................................................................-0.3V to +6V
RESET, RESET (push-pull) .........................-0.3V to (VCC + 0.3V)
RESET (open drain)..................................................-0.3V to +6V
Input Current (VCC) .............................................................20mA
Output Current (RESET, RESET).........................................20mA
Rate of Rise (VCC) ...........................................................100V/µs
Continuous Power Dissipation (TA = +70°C)
3-Pin SC70 (derate 2.7mW/°C above +70°C) ...............174mW
3-Pin SOT23 (derate 4mW/°C above +70°C)................320mW
Operating Temperature Range ...........................-40°C to +85°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
(VCC = full range, TA = -40°C to +85°C, unless otherwise noted. Typical values are at TA = +25°C and VCC = 3V.) (Note 1)
PARAMETER
SYMBOL
VCC Range
Supply Current
Reset Threshold
Reset Threshold Tempco
ICC
VTH
CONDITIONS
1.0
5.5
1.2
5.5
MAX632_ only, VCC = 3.0V for VTH ≤ 2.93V,
VCC = 3.2V for VTH > 2.93V, no load
0.5
1.0
VCC = 5.5V, no load
1.0
1.75
TA = +25°C
VTH 1.5%
VTH
VTH +
1.5%
TA = -40°C to +85°C
VTH 2.5%
VTH
VTH +
2.5%
Table 1
Reset Active Timeout Period
RESET Output Voltage
(MAX6326/MAX6346)
100
VOH
VOH
RESET Output Voltage
(MAX6327/MAX6347)
VOL
RESET Threshold
Hysteresis
UNITS
V
µA
V
40
ppm/°C
20
µs
185
280
ISINK = 1.6mA, VCC > 2.1V, reset asserted
0.3
ISINK = 100µA, VCC ≥ 1.2V, reset asserted
0.4
ms
V
ISOURCE = 500µA, VCC = 3.2V, MAX6326 only
0.8 · VCC
ISOURCE = 800µA, VCC = 4.5V, VTH ≤ 4.38V
0.8 · VCC
ISOURCE = 800µA, VCC = VTH(MAX), VTH ≥ 4.5V
0.8 · VCC
ISOURCE = 500µA, VCC ≥ 2.1V, reset asserted
0.8 · VCC
ISOURCE = 50µA, VCC ≥ 1.2V, reset asserted
0.8 · VCC
V
ISINK = 1.2mA, VCC ≥ 3.2V, reset not asserted,
MAX6327 only
0.3
ISINK = 3.2mA, VCC ≥ 4.5V, reset not asserted,
VTH ≤ 4.38V
0.4
ISINK = 3.2mA, VCC = VTH(MAX), VTH ≥ 4.5V
0.4
MAX6326/MAX6327/MAX6328
6.3
MAX6346/MAX6347/MAX6348
9.5
Open-Drain RESET Output
Leakage Current
Note 1: Overtemperature limits are guaranteed by design and not production tested.
2
MAX
TA = 0°C to +70°C
VCC = VTH to (VTH - 100mV)
VOL
TYP
TA = -40°C to +85°C
∆VTH/°C
VCC to Reset Delay
RESET Output Voltage
(MAX6326/MAX6328/
MAX6346/MAX6348)
MIN
_______________________________________________________________________________________
V
mV
0.1
µA
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MAX6326-01
1.0
0.9
MAX6326-02
SUPPLY CURRENT vs. TEMPERATURE
200
VCC = 5V
0.7
RESET DELAY (µs)
0.6
VCC = 3.3V
0.5
0.4
100
VOD = 20mV
VOD = 10mV
0.3
50
0.2
0.1
VOD = 100mV
VCC = 1.2V
VOD = 200mV
0
0
-20
0
20
40
60
-40
80
-20
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE (SC70)
MAX6326-03
210
200
190
180
170
160
150
140
500
MAXIMUM TRANSIENT DURATION (µs)
-40
POWER-UP RESET TIMEOUT (ms)
150
MAX6326-04
SUPPLY CURRENT (µA)
0.8
400
300
200
100
0
130
-40
-20
0
20
40
60
1
80
TEMPERATURE (°C)
10
100
1000
RESET THRESHOLD OVERDRIVE,
VTH - VCC (mV)
______________________________________________________________Pin Description
PIN
PIN
MAX6326/MAX6346
MAX6328/MAX6348
MAX6327
MAX6347
NAME
1
1
GND
FUNCTION
Ground
2
—
RESET
Active-Low Reset Output. RESET remains low while VCC is below the reset
threshold and for at least 100ms after VCC rises above the reset threshold.
RESET is open-drain on the MAX6328/MAX6348 and push-pull on the
MAX6326/MAX6346.
—
2
RESET
Active-High Reset Output. RESET remains high while VCC is below the reset
threshold and for at least 100ms after VCC rises above the reset threshold.
3
3
VCC
Supply Voltage
_______________________________________________________________________________________
3
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
__________________________________________Typical Operating Characteristics
(TA = +25°C, unless otherwise noted.)
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
____________ Applications Information
Interfacing to µPs with
Bidirectional Reset Pins
Since the RESET output on the MAX6328/MAX6348 is
open drain, these devices interface easily with microprocessors (µPs) that have bidirectional reset pins,
such as the Motorola 68HC11. Connecting the µP
supervisor’s RESET output directly to the microcontroller’s (µC’s) RESET pin with a single pull-up resistor
allows either device to assert reset (Figure 1).
VCC
VCC
VCC
MAX6328
MAX6348
µP
RESET
INPUT
RESET
MOTOROLA
68HCXX
Negative-Going VCC Transients
In addition to issuing a reset to the µP during power-up,
power-down, and brownout conditions, these devices
are relatively immune to short-duration, negative-going
VCC transients (glitches).
The Typical Operating Characteristics show the Maximum Transient Duration vs. Reset Threshold Overdrive
graph, for which reset pulses are not generated. The
graph shows the maximum pulse width that a negativegoing VCC transient may typically have when issuing a
reset signal. As the amplitude of the transient increases, the maximum allowable pulse width decreases.
GND
GND
Figure 1. Interfacing to µPs with Bidirectional Reset Pins
Table 1. Factory-Trimmed Reset Thresholds‡
RESET THRESHOLD VOLTAGE, VTH (V)
PART
SUFFIX
TA = +25°C
TA = -40°C to +85°C
MIN
TYP
MAX
MIN
MAX
MAX632_ _R
22
2.167
2.200
2.233
2.145
2.250
MAX632_ _R
23
2.285
2.320
2.355
2.262
2.375
MAX632_ _R
24
2.364
2.400
2.436
2.340
2.460
MAX632_ _R
25
2.462
2.500
2.537
2.437
2.562
MAX632_ _R
26
2.591
2.630
2.669
2.564
2.696
MAX632_ _R
27
2.660
2.700
2.741
2.633
2.768
MAX632_ _R
28
2.758
2.800
2.842
2.730
2.870
MAX632_ _R
29
2.886
2.930
2.974
2.857
3.000
MAX632_ _R
30
2.955
3.000
3.045
2.925
3.075
MAX632_ _R
31
3.034
3.080
3.126
3.003
3.150
MAX634_ _R
33
3.250
3.300
3.350
3.217
3.383
MAX634_ _R
34
3.349
3.400
3.451
3.315
3.485
MAX634_ _R
35
3.447
3.500
3.552
3.412
3.587
MAX634_ _R
36
3.546
3.600
3.654
3.510
3.690
MAX634_ _R
37
3.644
3.700
3.755
3.607
3.792
MAX634_ _R
38
3.743
3.800
3.857
3.705
3.895
‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.
4
_______________________________________________________________________________________
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
RESET THRESHOLD VOLTAGE, VTH (V)
PART
SUFFIX
TA = +25°C
TA = -40°C to +85°C
MIN
TYP
MAX
MIN
MAX
MAX634_ _R
39
3.841
3.900
3.958
3.802
3.997
MAX634_ _R
40
3.940
4.000
4.060
3.900
4.100
MAX634_ _R
41
4.038
4.100
4.161
3.997
4.202
MAX634_ _R
42
4.137
4.200
4.263
4.095
4.305
MAX634_ _R
43
4.235
4.300
4.364
4.192
4.407
MAX634_ _R
44
4.314
4.380
4.446
4.270
4.489
MAX634_ _R
45
4.432
4.500
4.567
4.387
4.612
MAX634_ _R
46
4.560
4.630
4.699
4.514
4.746
‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.
Table 2. Device Marking Codes and Minimum Order Increments
SOT23
SC70
ORDER
INCREMENT
(k)
FZBI
ACO
2.5
MAX6347_R46-T
TOP MARK
PART
MAX6346_R46-T
SOT23
SC70
ORDER
INCREMENT
(k)
FZBW
ACF
2.5
TOP MARK
PART
MAX6346_R45-T
FZBH
–
10
MAX6347_R45-T
FZBV
–
10
MAX6346_R44-T
FZBG
ACK
2.5
MAX6347_R44-T
FZBU
ACL
2.5
MAX6346_R43-T
FZBF
–
10
MAX6347_R43-T
FZBT
–
10
MAX6346_R42-T
FZBE
–
10
MAX6347_R42-T
FZBS
–
10
MAX6346_R41-T
FZBD
–
10
MAX6347_R41-T
FZBR
–
10
MAX6346_R40-T
FZBC
–
10
MAX6347_R40-T
FZBQ
–
10
MAX6346_R39-T
FZBB
–
10
MAX6347_R39-T
FZBP
–
10
MAX6346_R38-T
FZBA
–
10
MAX6347_R38-T
FZBO
–
10
MAX6346_R37-T
FZAZ
–
10
MAX6347_R37-T
FZBN
–
10
MAX6346_R36-T
FZAY
–
10
MAX6347_R36-T
FZBM
–
10
MAX6346_R35-T
FZAX
–
10
MAX6347_R35-T
FZBL
–
10
MAX6346_R34-T
FZAW
–
10
MAX6347_R34-T
FZBK
–
10
MAX6346_R33-T
FZAV
–
10
MAX6347_R33-T
FZBJ
–
10
MAX6326_R31-T
FDAA
ACE
2.5
MAX6327_R31-T
FMAA
ACT
2.5
MAX6326_R30-T
FEAA
–
10
MAX6327_R30-T
FNAA
–
10
MAX6326_R29-T
FCAA
ACP
2.5
MAX6327_R29-T
FLAA
ACS
2.5
MAX6326_R28-T
FBAA
–
10
MAX6327_R28-T
FKAA
–
10
MAX6326_R27-T
FAAA
–
10
MAX6327_R27-T
FJAA
–
10
MAX6326_R26-T
EZAA
ACI
2.5
MAX6327_R26-T
FIAA
ACR
2.5
MAX6326_R25-T
EYAA
–
10
MAX6327_R25-T
FHAA
–
10
MAX6326_R24-T
EXAA
–
10
MAX6327_R24-T
FGAA
–
10
MAX6326_R23-T
EWAA
ACH
2.5
MAX6327_R23-T
FFAA
ACQ
2.5
MAX6326_R22-T
EHAA
AAH
2.5
MAX6327_R22-T
EIAA
AAI
2.5
_______________________________________________________________________________________
5
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
Table 1. Factory-Trimmed Reset Thresholds‡ (continued)
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
Table 2. Device Marking Codes and Minimum Order Increments (continued)
SOT23
SC70
ORDER
INCREMENT
(k)
SOT23
SC70
ORDER
INCREMENT
(k)
MAX6348_R46-T
FZCK
ACN
2.5
MAX6348_R45-T
FZCJ
–
10
MAX6348_R34-T
FZBY
–
10
MAX6348_R33-T
FZBX
–
MAX6348_R44-T
FZCI
ACM
10
2.5
MAX6328_R31-T
FVAA
ACW
2.5
MAX6348_R43-T
FZCH
MAX6348_R42-T
FZCG
–
10
MAX6328_R30-T
FWAA
–
10
–
10
MAX6328_R29-T
FUAA
ACV
2.5
MAX6348_R41-T
MAX6348_R40-T
FZCF
–
10
MAX6328_R28-T
FTAA
–
10
FZCE
–
10
MAX6328_R27-T
FSAA
–
MAX6348_R39-T
10
FZCD
–
10
MAX6328_R26-T
FRAA
ACJ
2.5
MAX6348_R38-T
FZCC
–
10
MAX6328_R25-T
FQAA
–
10
MAX6348_R37-T
FZCB
–
10
MAX6328_R24-T
FPAA
–
10
MAX6348_R36-T
FZCA
–
10
MAX6328_R23-T
FOAA
ACU
2.5
MAX6348_R35-T
FZBZ
–
10
MAX6328_R22-T
EJAA
AAJ
2.5
TOP MARK
PART
Selector Guide
(standard versions*)
PART
TOP MARK
PART
___________________Chip Information
TRANSISTOR COUNT: 419
NOMINAL VTH
(V)
MAX634_ _R46-T
4.63
MAX634_ _R44-T
4.38
MAX632_ _R31-T
3.08
MAX632_ _R29-T
2.93
MAX632_ _R26-T
2.63
MAX632_ _R23-T
2.32
MAX632_ _R22-T
2.20
*Sample stock is generally held on all standard versions.
6
_______________________________________________________________________________________
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
SOTPO3L.EPS
_______________________________________________________________________________________
7
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
________________________________________________________Package Information
Package Information (continued)
SC70, 3L.EPS
MAX6326/MAX6327/MAX6328/MAX6346/MAX6347/MAX6348
3-Pin, Ultra-Low-Power SC70/SOT
µP Reset Circuits
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2000 Maxim Integrated Products
Printed USA
is a registered trademark of Maxim Integrated Products.
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