MAX6332 and MAX6333
Vishay Semiconductor
3 Pin, Low-Power,
µP
Reset Circuits
Pin Configuration
SOT-23 (Top View)
GND
1
3
Reset/
Reset
2
V
cc
Description
• The MAX6333 and 6332 are system supervisor
circuits designed to monitor V
CC
in digital systems
and provide a reset signal to the host processor
when necessary. No external components are
required.
• When the processor power supply voltage drops
below the reset threshold, the reset output is driven
active, in less than 40µs (T
D1
). Reset is main-
tained active for a time period (T
D2
), after the V
cc
rises above the threshold voltage.
• To prevent jitter, the reset threshold voltage has a
built-in hysteresis of 0.4% of V
TH
.
• The MAX6333 has an active-low reset output,
while the MAX6332 has an active-high reset
output. Both devices have push/pull output drives.
Fig. 1 – Typical Application Diagram
V
CC
V
CC
V
CC
MAX6332
MAX6333
RESET
(RESET)
GND
RESET
INPUT
µP
• The reset signal is guaranteed valid, down to
V
cc
= 1.0V.
• Low supply current of 3µA makes these devices
well suited for battery powered applications. They
are designed to reject fast transients from causing
false resets.
• Both devices are available in a space-saving
SOT-23 package.
GND
Applications
•
•
•
•
Computers
Critical
µP/µC
power monitoring
Battery powered equipment
Automotive electronics
Features
• Tight reset voltage tolerances ± 1.8%
• Low supply current: < 3µA
• Precision monitoring of 1.8V and 2.5V
powersupply voltages
• Other threshold voltage options available from
1.5V to 2.5V in approximately 100mV increments
• Three reset active time-out period options:
typical 1.5mS, 30mS, 150mS
• Reset output guaranteed down to 1.0V
• V
cc
transient immunity
• No external components
Document Number #####
27-Nov-01
www.vishay.com
1
MAX6332 and MAX6333
Vishay Semiconductor
Ordering Information
Reset Active High
MAX6332URxxDx
MAX6333URxxDx
Reset Active Low
Reset Timeout Period (Typical)
1: 1.5mS
2: 30mS
3: 150mS (Standard)
Reset Voltage Options (Typical)
15: 1.5V
16: 1.6V (Standard)
18: 1.8V (Standard)
19: 1.9V
20: 2.0V (Standard)
21: 2.1V
22: 2.2V (Standard)
23: 2.3V (Standard)
24: 2.4V
25: 2.5V
Sample stock is generally available on standard parts.
Contact our local sales office for availability of non standard versions (minimum order quantity is 10,000 pcs).
Marking Information
XX X XX
Threshold Voltage
(No Period)
Reset Timeout Period
Active Low
Active High
1.5mS
A
L
30mS
D
Q
150mS
E
R
First Two Digits of the Part Number
Example:
MAX6332
MAX6333
1.8V
1.8V
150mS
150mS
Timeout Period
Timeout Period
63R18
63E18
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2
Document Number #####
27-Nov-01
MAX6332 and MAX6333
Vishay Semiconductor
Absolute Maximum Ratings
(1)
Parameter
Supply Voltage
Reset/Reset
Input Current, V
cc
Output Current, Reset/Reset
dV/dT (V
cc
)
Operating Temperature Range
Storage Temperature Range
Power Dissipation (T
A
≤
70°C)
SOT-23 (Derate 4mW/°C above 70°C)
T
A
T
stg
P
D
Symbol
V
cc
Value
6.0
–0.3 to (V
cc
+ 0.3)
20
20
100
–40 to +125
–65 to +150
260
Unit
V
V
mA
mA
V/µS
°C
°C
mW
Note:
(1) Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device.
Electrical Characteristics
Parameter
T
A
= –40°C to 125°C unless otherwise noted. Typical values are at T
A
= 25°C
Symbol
Test Conditions
T
A
= 25°C
Min
1
1
1.2
–
–
V
TH
–1.8%
V
TH
–3%
Typ
–
–
–
–
–
V
TH
V
TH
0.4
Max
5.5
5.5
5.5
7.0
3.0
V
TH
+1.8%
V
TH
+3%
Unit
V
cc
Range
V
RANGE
T
A
= –40 to +85°C
T
A
= –40 to +125°C
V
Supply Current
(No Load)
Reset Threshold
Threshold Hysteresis
I
CC
Vcc = 3.0V
T
A
= 25°C
µA
V
TH
V
TH HIST
T
A
= 25°C
T
A
= –40 to +125°C
V
%V
TH
Reset Output Voltage Low
V
OL
MAX6332 V
CC
> V
TH
MAX6333 V
CC
< V
TH
I
SINK
= 50µA, V
CC
≥1.0V
I
SINK
= 500µA, V
CC
≥1.8V
MAX6332 V
CC
< V
TH
MAX6333 V
CC
> V
TH
I
SOURCE
= 200µA, V
CC
≥1.8V
I
SOURCE
= 500µA, V
CC
≥2.7V
V
CC
to V
TH
– 100mV
MAX633xUR−D1
MAX633xUR−D2
MAX633xUR−D3
–
–
0.4
0.3
V
Reset Output Voltage High
V
OH
0.8V
CC
0.8V
CC
–
1
20
100
–
–
V
µS
mS
V
CC
Falling Reset Delay
Reset Timeout Period
T
D1
T
D2
–
1.5
30
150
40
2
40
200
Document Number #####
27-Nov-01
www.vishay.com
3
MAX6332 and MAX6333
Vishay Semiconductor
Ratings and
Characteristic Curves
(T
Fig. 2 – Timing Diagram
A
= 25°C unless otherwise noted)
V
TH
V
TH
V
CC
T
D2
Reset
50%
T
D1
50%
T
D2
Reset
50%
T
D1
50%
Fig. 3 – Transient Rejection
Supply (V
CC
) Transients
Transient Duration (µS)
140
120
100
80
60
40
20
0
0.01
These devices have a certain immunity to fast negative
going transients. The graph titled “Transient Rejection”
shows the maximum allowable transient amplitude and
duration to avoid triggering an unintended reset. As
shown in the graph shorter transients can have larger
amplitudes without triggering resets.
0.1
1
Transient Amplitude (V)
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4
Document Number #####
27-Nov-01
MAX6332 and MAX6333
Vishay Semiconductor
Ratings and
Characteristic Curves
(T
A
= 25°C unless otherwise noted)
Fig. 4 – Reset Time vs. Temperature
170
2.35
Fig. 5 – I
CC
vs. Temperature
165
160
155
MAX6333UR25D3
Supply Current @5V (µA)
2.30
Reset Time (mS)
2.25
MAX6333UR25D3
2.20
150
145
2.15
140
--50
--20
10
40
70
100
130
2.10
--50
--20
10
40
70
100
130
Temperature (°C)
Temperature (°C)
Fig. 6 – Reset V
th
vs. Temperature
2.506
2.504
2.502
2.500
1.6
85°C
2
Fig. 7 – I
CC
vs. V
CC
Reset V
th
(V)
40°C
2.496
2.494
2.492
2.490
2.488
2.486
--50
--20
MAX6333UR25D3
I
CC
(µA)
2.498
1.2
0°C
0.8
0.4
0
10
40
70
100
130
0
1
2
3
4
5
Temperature (°C)
V
CC
(V)
Fig. 8 – TD1 Delay vs. Temperature
43
42
TD1 Delay (µS)
41
40
39
38
37
--40
--20
0
20
40
60
80
100
Temperature (°C)
Document Number #####
27-Nov-01
www.vishay.com
5
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