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
(V
CC
= full range, T
A
= -40°C to +85°C, unless otherwise noted. Typical values are at T
A
= +25°C and V
CC
= 3V.) (Note 1)
PARAMETER
V
CC
Range
SYMBOL
CONDITIONS
T
A
= 0°C to +70°C
T
A
= -40°C to +85°C
I
CC
MAX632_ only, V
CC
= 3.0V for V
TH
≤ 2.93V,
V
CC
= 3.2V for V
TH
> 2.93V, no load
V
CC
= 5.5V, no load
Table 1
T
A
= +25°C
T
A
= -40°C to +85°C
V
CC
= V
TH
to (V
TH
- 100mV)
100
V
OL
I
SINK
= 1.6mA, V
CC
> 2.1V, reset asserted
I
SINK
= 100µA, V
CC
≥ 1.2V, reset asserted
I
SOURCE
= 500µA, V
CC
= 3.2V, MAX6326 only
V
OH
V
OH
RESET Output Voltage
(MAX6327/MAX6347)
I
SOURCE
= 800µA, V
CC
= 4.5V, V
TH
≤ 4.38V
I
SOURCE
= 800µA, V
CC
= V
TH(MAX),
V
TH
≥ 4.5V
I
SOURCE
= 500µA, V
CC
≥ 2.1V, reset asserted
I
SOURCE
= 50µA, V
CC
≥ 1.2V, reset asserted
I
SINK
= 1.2mA, V
CC
≥ 3.2V, reset not asserted,
MAX6327 only
V
OL
I
SINK
= 3.2mA, V
CC
≥ 4.5V, reset not asserted,
V
TH
≤ 4.38V
I
SINK
= 3.2mA, V
CC
= V
TH(MAX)
, V
TH
≥ 4.5V
RESET Threshold
Hysteresis
Open-Drain
RESET
Output Leakage Current
Note 1:
Overtemperature limits are guaranteed by design and not production tested.
MAX6326/MAX6327/MAX6328
MAX6346/MAX6347/MAX6348
6.3
9.5
0.1
0.8 · V
CC
0.8 · V
CC
0.8 · V
CC
0.8 · V
CC
0.8 · V
CC
0.3
0.4
0.4
mV
µA
V
V
V
TH
-
1.5%
V
TH
-
2.5%
MIN
1.0
1.2
0.5
1.0
V
TH
V
TH
40
20
185
280
0.3
0.4
TYP
MAX
5.5
5.5
1.0
1.75
V
TH
+
1.5%
V
TH
+
2.5%
UNITS
V
Supply Current
µA
Reset Threshold
Reset Threshold Tempco
V
CC
to Reset Delay
Reset Active Timeout Period
RESET
Output Voltage
(MAX6326/MAX6328/
MAX6346/MAX6348)
RESET
Output Voltage
(MAX6326/MAX6346)
V
TH
∆V
TH
/°C
V
ppm/°C
µs
ms
V
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MAX6326/MAX6327/
MAX6328/MAX6346/
MAX6347/MAX6348
Typical Operating Characteristics
(T
A
= +25°C, unless otherwise noted.)
3-Pin, Ultra-Low-Power SC70/SOT
μP Reset Circuits
MAX6326 toc01
1.0
0.9
SUPPLY CURRENT (µA)
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0
SUPPLY CURRENT vs. TEMPERATURE
200
RESET DELAY (µs)
150
POWER-DOWN RESET DELAY
vs. TEMPERATURE
MAX6326 toc02
V
CC
= 5V
V
CC
= 3.3V
100
V
OD
= 20mV
V
OD
= 10mV
50
V
CC
= 1.2V
-40
-20
0
20
40
60
80
0
-40
-20
V
OD
= 100mV
V
OD
= 200mV
0
20
40
60
80
TEMPERATURE (°C)
TEMPERATURE (°C)
MAX6326 toc03
POWER-UP RESET TIMEOUT (ms)
200
190
180
170
160
150
140
130
-40
-20
0
20
40
60
80
MAXIMUM TRANSIENT DURATION (µs)
400
300
200
100
0
TEMPERATURE (°C)
1
10
100
1000
RESET THRESHOLD OVERDRIVE,
V
TH
- V
CC
(mV)
Pin Description
PIN
MAX6326/MAX6346
MAX6328/MAX6348
1
MAX6327
MAX6347
1
NAME
GND
FUNCTION
Ground
Active-Low Reset Output.
RESET
remains low while V
CC
is below the reset
threshold and for at least 100ms after V
CC
rises above the reset threshold.
RESET
is open-drain on the MAX6328/MAX6348 and push-pull on the
MAX6326/MAX6346.
Active-High Reset Output. RESET remains high while V
CC
is below the reset
threshold and for at least 100ms after V
CC
rises above the reset threshold.
Supply Voltage
2
—
RESET
—
3
2
3
RESET
V
CC
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MAX6326 toc04
210
POWER-UP RESET TIMEOUT
vs. TEMPERATURE
500
MAXIMUM TRANSIENT DURATION
vs. RESET THRESHOLD OVERDRIVE (SC70)
MAX6326/MAX6327/
MAX6328/MAX6346/
MAX6347/MAX6348
Applications Information
Interfacing to µPs with
Bidirectional Reset Pins
V
CC
3-Pin, Ultra-Low-Power SC70/SOT
μP Reset Circuits
Since the
RESET
output on the MAX6328/MAX6348 is
open drain, these devices interface easily with micropro-
cessors (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).
V
CC
V
CC
MAX6328
MAX6348
RESET
µP
MOTOROLA
68HCXX
RESET
INPUT
Negative-Going V
CC
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 V
CC
transients (glitches).
The
Typical Operating Characteristics
show the Maxi-
mum Transient Duration vs. Reset Threshold Overdrive
graph, for which reset pulses are not generated. The
graph shows the maximum pulse width that a negative-
going V
CC
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‡
PART
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX632_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
SUFFIX
MIN
22
23
24
25
26
27
28
29
30
31
33
34
35
36
37
38
2.167
2.285
2.364
2.462
2.591
2.660
2.758
2.886
2.955
3.034
3.250
3.349
3.447
3.546
3.644
3.743
TA = +25°C
TYP
2.200
2.320
2.400
2.500
2.630
2.700
2.800
2.930
3.000
3.080
3.300
3.400
3.500
3.600
3.700
3.800
RESET THRESHOLD VOLTAGE, V
TH
(V)
MAX
2.233
2.355
2.436
2.537
2.669
2.741
2.842
2.974
3.045
3.126
3.350
3.451
3.552
3.654
3.755
3.857
TA = -40°C to +85°C
MIN
MAX
2.250
2.375
2.460
2.562
2.696
2.768
2.870
3.000
3.075
3.150
3.383
3.485
3.587
3.690
3.792
3.895
2.145
2.262
2.340
2.437
2.564
2.633
2.730
2.857
2.925
3.003
3.217
3.315
3.412
3.510
3.607
3.705
‡Factory-trimmed reset thresholds are available in approximately 100mV increments with a 1.5% room-temperature variance.
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MAX6326/MAX6327/
MAX6328/MAX6346/
MAX6347/MAX6348
3-Pin, Ultra-Low-Power SC70/SOT
μP Reset Circuits
Table 1. Factory-Trimmed
Reset Thresholds‡ (continued)
PART
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
MAX634_ _R
SUFFIX
MIN
39
40
41
42
43
44
45
46
3.841
3.940
4.038
4.137
4.235
4.314
4.432
4.560
T
A
= +25°C
TYP
3.900
4.000
4.100
4.200
4.300
4.380
4.500
4.630
RESET THRESHOLD VOLTAGE, V
TH
(V)
MAX
3.958
4.060
4.161
4.263
4.364
4.446
4.567
4.699
T
A
= -40°C to +85°C
MIN
MAX
3.802
3.900
3.997
4.095
4.192
4.270
4.387
4.514
3.997
4.100
4.202
4.305
4.407
4.489
4.612
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
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