INTEGRATED CIRCUITS
MAX6326/MAX6327/MAX6328/
MAX6346/MAX6347/MAX6348
3-pin ultra-low power SC70/SOT
microprocessor reset circuit
Product data
Supersedes data of 2003 Apr 30
2003 Aug 05
Philips
Semiconductors
Philips Semiconductors
Product data
3-pin ultra-low power SC70/SOT
microprocessor reset circuit
MAX632x/MAX634x
DESCRIPTION
The MAX6326/MAX6327//MAX6328/MAX6346/MAX6347/MAX6348
microprocessor (µP) reset circuits monitor power supplies in
µP
and
digital systems. These devices eliminate external components and
adjustments while providing excellent circuit reliability and low cost
solution. They are used to monitor 2.5 V, 3 V, 3.3 V and 5 V power
supplies.
They assert a reset signal when the V
DD
supply voltage falls below a
preset reset threshold voltage. The reset signal remains asserted for
at least 100 ms after the V
DD
rises above the reset threshold. The
reset threshold are factory trimmable from 2.2 V to 4.63 V in
approximately 100 mV increments. All these parts are guaranteed to
assert a reset for V
DD
down to 1 V. They have excellent immunity to
fast transients on V
DD
.
The devices vary in their output configuration. The
MAX6326/MAX6346 have push-pull, active-LOW reset output; while
the MAX6328/MAX6348 have open drain, active-LOW reset output.
The MAX6327/MAX6347 have push-pull, active HIGH reset output.
The lower threshold MAX6326/MAX6327/MAX6328 have ultra-low
supply current of typically 0.5
µA
making them ideal for battery
powered applications. All six devices are available in both the 3-pin
SOT23 and SC70 packages.
FEATURES
•
Ultra-low 1
µA
(max) supply current
•
Precision monitoring of 2.5 V, 3 V, 3.3 V, and 5 V power supply
voltages
•
Reset thresholds available from 2.2 V to 4.63 V
•
Fully specified over temperature –40
°C
to +85
°C
•
100 ms (min) power-on-reset delay time
•
Power transient immunity
•
Available in three versions: Push-Pull RESET, Push-Pull RESET,
and Open-Drain RESET
•
Pin compatible with MAX803/MAX809/MAX810
•
Small, low cost, 3-pin SC70/SOT23 packages
APPLICATIONS
•
Computers and controllers
•
Power monitoring
•
Portable/battery powered equipment
•
Industrial equipment
SIMPLIFIED SYSTEM DIAGRAM
V
DD
V
DD
R
PU
V
DD
RESET
RESET
MOTOROLA
68HCXX
MAX6328/
MAX6348
GND
GND
SL01835
Figure 1. MAX6328/6348 simplified system diagram.
2003 Aug 05
2
Philips Semiconductors
Product data
3-pin ultra-low power SC70/SOT
microprocessor reset circuit
MAX632x/MAX634x
ORDERING INFORMATION
MAX632x
TYPE
NUMBER
MAX6326-XXD
MAX6326-XXW
MAX6327-XXD
MAX6327-XXW
MAX6328-XXD
MAX6328-XXW
PACKAGE
NAME
SOT23-3
SC70-3
SOT23-3
SC70-3
SOT23-3
SC70-3
DESCRIPTION
Plastic small outline package; 3 leads; body width 1.5 mm
Plastic small outline package; 3 leads; body width 1.15 mm
Plastic small outline package; 3 leads; body width 1.5 mm
Plastic small outline package; 3 leads; body width 1.15 mm
Plastic small outline package; 3 leads; body width 1.5 mm
Plastic small outline package; 3 leads; body width 1.15 mm
TEMPERATURE
RANGE
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
RESET
push-pull
push-pull
push-pull
push-pull
open-drain
open-drain
Active-LOW
reset output
Active-LOW
reset output
Active-HIGH
reset output
Active-HIGH
reset output
Active-LOW
reset output
Active-LOW
reset output
NOTE:
The device has five standard voltage output options, indicated by the XX on the “Type Number”.
Additional voltage output options may be available (see Table 1).
XX (type number suffix)
22
23
26
29
31
Voltage (Typical)
2.2 V
2.3 V
2.6 V
2.9 V
3.1 V
MAX634x
TYPE
NUMBER
MAX6346-XXD
MAX6346-XXW
MAX6347-XXD
MAX6347-XXW
MAX6348-XXD
MAX6348-XXW
PACKAGE
NAME
SOT23-3
SC70-3
SOT23-3
SC70-3
SOT23-3
SC70-3
DESCRIPTION
Plastic small outline package; 3 leads; body width 1.5 mm
Plastic small outline package; 3 leads; body width 1.15 mm
Plastic small outline package; 3 leads; body width 1.5 mm
Plastic small outline package; 3 leads; body width 1.15 mm
Plastic small outline package; 3 leads; body width 1.5 mm
Plastic small outline package; 3 leads; body width 1.15 mm
TEMPERATURE
RANGE
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
–40
°C
to +85
°C
RESET
push-pull
push-pull
push-pull
push-pull
open-drain
open-drain
Active-LOW
reset output
Active-LOW
reset output
Active-HIGH
reset output
Active-HIGH
reset output
Active-LOW
reset output
Active-LOW
reset output
NOTE:
The device has two standard voltage output options, indicated by the XX on the “Type Number”.
Additional voltage output options may be available (see Table 1).
XX (type number suffix)
44
46
Voltage (Typical)
4.4 V
4.6 V
2003 Aug 05
3
Philips Semiconductors
Product data
3-pin ultra-low power SC70/SOT
microprocessor reset circuit
MAX632x/MAX634x
PINNING
MAX6326/MAX6346, MAX6328/MAX6348 pin
description
GND
1
PIN
1
MAX632x/
MAX634x
3
V
DD
SYMBOL
GND
RESET
Device ground
DESCRIPTION
Active-LOW Reset Output. RESET remains
LOW while V
DD
is below the reset threshold
and for a reset delay time of at least 100 ms
after V
DD
rises above the reset threshold.
MAX6328/MAX6348 have open-drain output
and the MAX6326/MAX6346 are Push-Pull
output.
Positive supply voltage
2
RESET
or RESET
2
SL01839
Figure 2. Pin configuration.
3
V
DD
MAX6327/MAX6347 pin description
PIN
1
2
SYMBOL
GND
RESET
Device ground
Active-HIGH Reset Output. RESET remains
high while V
DD
is below the reset threshold
and remains HIGH for at least 100 ms after
V
DD
rises above the reset threshold.
Positive supply voltage
DESCRIPTION
3
V
DD
MAXIMUM RATINGS
SYMBOL
V
DD
V
i(RESET)
PARAMETER
Supply voltage
Input voltage at RESET pin
(MAX6326/MAX6346,
MAX6328/MAX6348)
Input current at V
DD
pin
Output current (RESET pin)
Power dissipation
3-pin SOT23 (derate 4 mW/°C above T
amb
= 70
°C)
3-pin SC70 (derate 2.7 mW/°C above T
amb
= 70
°C)
T
opr
T
stg
Operating temperature
Storage temperature
CONDITIONS
MIN.
–0.3
–0.3
MAX.
6.0
6.0
UNIT
V
V
I
i(VDD)
I
o
P
–
–
–
–
–40
–65
20
20
320
174
+85
+150
mA
mA
mW
°C
°C
2003 Aug 05
4
Philips Semiconductors
Product data
3-pin ultra-low power SC70/SOT
microprocessor reset circuit
MAX632x/MAX634x
ELECTRICAL CHARACTERISTICS
V
DD
= full range (T
amb
= –40
°C
to +85
°C)
unless otherwise noted; typical values are at T
amb
= +25
°C,
and V
DD
= 3 V (Note 1).
SYMBOL
PARAMETER
V
DD
range
CONDITIONS
T
amb
= 0
°C
to +70
°C
T
amb
= –40
°C
to +85
°C
I
DD
Supply current
MAX632x only, V
DD
= 3.0 V for V
th
≤
2.93 V,
V
DD
= 3.2 V for V
th
> 2.93 V, no load
V
DD
= 5.5 V, no load
V
th
∆V
th
/°C
t
RD
t
RP
V
OL(RESET)
Reset threshold
(Table 1)
Reset threshold temperature
coefficient
V
CC
to Reset release delay
Reset active timeout period
RESET output voltage
(reset asserted)
RESET output voltage
(reset released)
I
SINK
= 1.6 mA, V
DD
> 2.1 V
I
SINK
= 100 mA, V
DD
≥
1.2 V
I
SOURCE
= 500 mA, V
DD
= 3.2 V, MAX6326 only
I
SOURCE
= 800
µA,
V
DD
= 4.5 V, V
th
≤
4.38 V
I
SOURCE
= 800
µA,
V
DD
= V
th(MAX)
, V
th
≥
4.5 V
V
OH(RESET)
RESET output voltage
(reset asserted)
(
)
(MAX6327/MAX6347)
V
OL(RESET)
RESET output voltage
(reset released)
(MAX6327/MAX6347)
V
hys
RESET threshold hysteresis
I
SOURCE
= 500
µA,
V
DD
≥
2.1 V
I
SOURCE
= 50
µA,
V
DD
≥
1.2 V
I
SINK
= 1.2 mA, V
DD
≥
3.2 V (MAX6327 only)
I
SINK
= 3.2 mA, V
DD
≥
3.2 V, V
th
≤
4.38 V
I
SINK
= 3.2 mA, V
DD
= V
th(MAX)
, V
th
≥
4.5 V
MAX6326/MAX6327/MAX6328
MAX6346/MAX6347/MAX6348
Open-drain RESET output
leakage current
NOTE:
1. Over-temperature limits are guaranteed by design and are not production tested.
V
DD
= V
th
to (V
th
– 100 mV)
T
amb
= +25
°C
T
amb
= –40
°C
to +85
°C
MIN
1.0
1.2
TYP
MAX
5.5
5.5
0.5
1.0
V
th
V
th
40
20
185
1.0
1.75
V
th
+ 1.5%
V
th
+ 2.5%
UNIT
V
V
µA
µA
V
V
ppm/°C
µs
ms
V
V
V
V
V
V
V
V
V
V
mV
mV
µA
–
–
V
th
– 1.5%
V
th
– 2.5%
–
–
100
–
–
280
0.3
0.4
–
–
0.8
×
V
CC
0.8
×
V
CC
0.8
×
V
CC
0.8
×
V
CC
0.8
×
V
CC
V
OH(RESET)
–
–
–
–
–
0.3
0.4
0.4
6.3
9.5
–
–
–
–
–
–
–
–
0.1
2003 Aug 05
5
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