MAX6332 and MAX6333
Vishay Semiconductor
Document Number ##### www.vishay.com
27-Nov-01 1
3 Pin, Low-Power, µP Reset Circuits
Description
• The MAX6333 and 6332 are system super visor
circuits designed to monitor VCC in digital systems
and provide a reset signal to the host processor
when necessar y. No exter nal components are
required.
• When the processor power supply voltage drops
below the reset threshold, the reset output is driven
active, in less than 40µs (TD1). Reset is main-
tained active for a time per iod (TD2), after the Vcc
rises above the threshold voltage.
• To prevent jitter, the reset threshold voltage has a
built-in hysteresis of 0.4% of VTH.
• The MAX6333 has an active-low reset output,
while the MAX6332 has an active-high reset
output. Both devices have push/pull output drives.
• The reset signal is guaranteed valid, down to
Vcc = 1.0V.
• Low supply current of 3µA makes these devices
well suited for batter y powered applications.They
are designed to reject fast transients from causing
false resets.
• Both devices are available in a space-saving
SOT-23 package.
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
• Vcc transient immunity
• No exter nal components
Fig. 1 – Typical Application Diagram
Pin Configuration
SOT-23 (Top View)
Applications
• Computers
• Critical µP/µC power monitoring
• Batter y powered equipment
• Automotive electronics
1
2
3
GND
Reset/
Reset
Vcc
VCC
VCC
RESET RESET
INPUT
GND
VCC
GND
µP
(RESET)
MAX6332
MAX6333
MAX6332 and MAX6333
Vishay Semiconductor
www.vishay.com Document Number #####
227-Nov-01
Ordering Information
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
Reset Active High
MAX6332URxxDx
MAX6333URxxDx
Sample stock is generally available on standard par ts.
Contact our local sales office for availability of non standard versions (minimum order quantity is 10,000 pcs).
Marking Information
XX X XX
Example:
MAX6332 1.8V 150mS Timeout Per iod 63R18
MAX6333 1.8V 150mS Timeout Per iod 63E18
Threshold Voltage
(No Per iod)
Reset Timeout Period
Active LowActive High
1.5mS A L
30mS D Q
150mS E R
First Two Digits of the Par t Number
MAX6332 and MAX6333
Vishay Semiconductor
Document Number ##### www.vishay.com
27-Nov-01 3
Absolute Maximum Ratings(1)
Parameter Symbol Value Unit
Supply Voltage Vcc 6.0 V
Reset/Reset –0.3 to (Vcc + 0.3) V
Input Current, Vcc 20 mA
Output Current, Reset/Reset 20 mA
dV/dT (Vcc)100 V/µS
Operating Temperature Range TA–40 to +125 °C
Storage Temperature Range Tstg –65 to +150 °C
Power Dissipation (TA≤70°C) PD260 mW
SOT-23 (Derate 4mW/°C above 70°C)
Note: (1) Stresses beyond those listed under “Absolute Maximum Ratings”may cause permanent damage to the device.
Electrical Characteristics TA= –40°C to 125°C unless otherwise noted.Typical values are at TA= 25°C
Parameter Symbol Test Conditions Min Typ Max Unit
TA= 25°C1–5.5
Vcc Range VRANGE TA= –40 to +85°C1 –5.5 V
TA= –40 to +125°C 1.2 –5.5
Supply Current ICC Vcc = 3.0V ––7.0 µA
(No Load) TA= 25°C––3.0
Reset Threshold VTH TA= 25°CVTH –1.8% VTH VTH+1.8% V
TA= –40 to +125°CVTH –3% VTH VTH+3%
Threshold Hysteresis VTH HIST 0.4 %VTH
MAX6332 VCC > VTH
Reset Output Voltage Low VOL MAX6333 VCC < VTH –– V
ISINK = 50µA, VCC ≥1.0V 0.4
ISINK = 500µA, VCC ≥1.8V 0.3
MAX6332 VCC < VTH
Reset Output Voltage High VOH MAX6333 VCC > VTH ––V
ISOURCE = 200µA, VCC≥1.8V 0.8VCC
ISOURCE = 500µA, VCC≥2.7V 0.8VCC
VCC Falling Reset Delay TD1 VCC to VTH – 100mV ––40 µS
MAX633xUR−D1 1 1.5 2
Reset Timeout Period TD2 MAX633xUR−D2 20 30 40 mS
MAX633xUR−D3 100 150 200
MAX6332 and MAX6333
Vishay Semiconductor
www.vishay.com Document Number #####
427-Nov-01
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
TD2
VTH
TD2 50%
50%
50%
50%
VCC
Reset
Reset
0.01 0.1
0
20
40
60
80
100
120
140
1
Fig. 3 – Transient Rejection
Transient Duration (µS)
T ransient Amplitude (V)
Fig. 2 – Timing Diagram
VTH
TD1
TD1
Supply (VCC) Transients
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 shor ter transients can have larger
amplitudes without trigger ing resets.
MAX6332 and MAX6333
Vishay Semiconductor
Document Number ##### www.vishay.com
27-Nov-01 5
140
145
150
155
165
170
40--20 10 70--50 130100
40--20 10 70--50 130100
160
Fig. 4 – Reset Time vs. Temperature
Reset T ime (mS)
Temperature (°C)
0
0.4
0.8
1.6
2
012345
1.2
Fig. 7 – ICC vs. VCC
ICC (µA) Supply Current @5V (µA)
VCC (V)
37
38
39
40
42
43
020--20 40--40 60 80 100
41
Fig. 8 – TD1 Delay vs. Temperature
TD1 Delay (µS)
Temperature (°C)
Fig. 6 – Reset Vth vs. Temperature
Reset Vth (V)
Temperature (°C)
2.10
2.15
2.20
2.25
2.30
2.35 Fig. 5 – ICC vs. Temperature
Temperature (°C)
2.486
2.488
2.490
2.492
2.494
2.496
2.498
2.500
2.502
2.504
2.506
40--20 10 70--50 130100
MAX6333UR25D3
MAX6333UR25D3
MAX6333UR25D3
85°C
40°C
0°C
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
MAX6332 and MAX6333
Vishay Semiconductor
www.vishay.com Document Number #####
627-Nov-01
40--20 10 70--50 130100
0
0.1
0.2
0.4
0.5
020--20 40--40 60 80 100
0.3
Fig. 9 – Threshold Hysteresis
vs. Temperature
Hysteresis (% of VTH)
Temperature (°C)
Fig. 10 – Reset VOL vs. Temperature
Reset VOL @0.8mA (V)
Temperature (°C)
0.220
0.225
0.230
0.235
0.240
0.245
0.250
0.255
0.260
0.265
MAX6333URxxDx
Ratings and
Characteristic Curves(TA= 25°C unless otherwise noted)
0.15
12
3Top View
3.10
2.70
3.00
2.60
1.80
1.40
1.25
0.70
1.90
(TYP.)
0.25
0.10
0.50
0.35
1.40
1.00
θ1 9°
1°
0.55
0.35
SOT-23 Case Outline
Dimensions in millimeters
0.079 (2.0)
0.037 (0.95)
0.035 (0.9)
0.031 (0.8)
0.037 (0.95)
Mounting Pad Layout
