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IMP6303
POWER MANAGEMENT
3-Pin Microcontroller Power Supply Supervisor
The IMP6303 is a 4.0V power supply supervisor circuits optimized for lowpower microprocessor (P), microcontroller (C) and digital systems. A reset signal is issued if the power supply voltage drops below a preset reset threshold and is asserted for at least 140ms after the supply has risen above the reset threshold. The IMP6303 has an active-low RESET output that is guaranteed to be in the correct state for VCC down to 1.1V. The reset comparator is designed to ignore fast transients on VCC. Low supply current makes the IMP6303 ideal for use in portable and battery operated equipment. The IMP6303 is available in a compact 3-pin SOT23, TO-92 and 5 pin SOT23-5 packages.
Key Features
N Monitor 4.0V supply N 140ms min. reset pulse width N Active-low reset valid with 1.1V supply N Small 3-pin SOT-23 package N Small 3-pin TO-92 package N Small 5-pin SOT-23-5 package N No external components N Specified over full temperature range -- - 40C to 105C
Applications
N N N N N Embedded controllers Battery operated systems Intelligent instruments Wireless communication systems PDAs and handheld equipment
Block Diagrams
VCC VCC
IMP6303
RESET (RESET) GND RESET Input
VCC P
GND
6303_01.eps
(c) 2001 IMP, Inc.
408-432-9100/www.impweb.com
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IMP6303
Pin Configuration
SOT-23
(RESET) RESET 1 IMP6303 3 GND
TO-92
SOT-23-5
IMP6303 1 2 3 NC GND NC 1 IMP6303 2 3 4 RESET (RESET)
6303_07.eps 6303_06.eps
5
VCC
VCC 2
6303_02.eps
VCC
GND
RESET (RESET)
Ordering Information
1
Part Number Reset Threshold (V) IMP6303 Active LOW Reset
IMP6303JEUR-T 4.00
Temperature Range
- 40C to +105C
Pin-Package
3-SOT23
Package Marking2 (XX Lot Code)
CWXX
Notes:
1. Tape and Reel packaging is indicated by the -T designation. 2. Devices may also be marked with full part number: 6303L, 6303M etc. XX refers to lot.
Related Products
IM6303
Max. Supply Current Package Pins Package Type Active-LOW RESET output 15A 3 SOT-23 I
IMP6303
15A 3 TO-92 I
IMP6303
15A 5 SOT-23-5 I
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(c) 2001 IMP, Inc.
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IMP6303
Absolute Maximum Ratings
Pin Terminal Voltage with Respect to Ground VCC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to 6.0V RESET, RESET . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V) Input Current at VCC . . . . . . . . . . . . . . . . . . . 20mA Output Current: RESET, RESET . . . . . . . . . 20mA Rate of Rise at VCC . . . . . . . . . . . . . . . . . . . . 100V/s These are stress ratings only and functional operation is not implied. Exposure to absolute maximum ratings for prolonged time periods may affect device reliability Power Dissipation (TA = 70C) . . . . . . . . . . 320mW (Derate 4mW/C above 70C) Operating Temperature Range . . . . . . . . . . -40C to 105C Storage Temperature Range . . . . . . . . . . . . . -65C to 160C Lead Temperature (soldering, 10 sec) . . . . . 300C
Electrical Characteristics
Unless otherwise noted VCC is over the full voltage range, TA = -40C to 105C. Typical values at TA = 25C, VCC = 5V for L/M/J devices.
Parameter
Input Voltage (VCC) Range Supply Current Reset Threshold
Symbol Conditions
VCC ICC VTH TA = 0C to 70C TA = - 40C to 105C TA = - 40C to 85C VCC < 4.0V TA = 25C TA = - 40C to 85C TA = 85C to 105C
Min
1.1 1.2 3.93 3.89 3.80
Typ
9 4.00
Max
5.5 5.5 15 4.06 4.10 4.20
Units
V A
Reset Threshold Stability VCC to Reset Delay Reset Active Timeout Period Low RESET Output Voltage
VOL VOL
High RESET Output Voltage Notes:
VOH
VCC = VTH to VTH - 100mV TA = - 40C to 85C TA = 85C to 105C VCC = VTH min., ISINK = 1.2mA VCC = VTH min., ISINK = 3.2mA VCC > 1.1V, ISINK = 50A VCC > VTH max., ISOURCE = 500A VCC > VTH max., ISOURCE = 800A
140 100
30 20 240 0.3
560 840 V 0.4 0.3
ppm/C s ms
0.8VCC VCC -1.5
V
1. Production testing done at TA = 25C. Over-temperature specifications guaranteed by design only. 2. RESET output is active LOW for the IMP6303.
(c) 2001 IMP, Inc.
Microprocessor Supervisor
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IMP6303
Pin Descriptions
Name
GND RESET VCC
Function
Ground RESET is asserted LOW if VCC falls below the reset threshold and remains LOW for the 240ms typical reset timeout period (140ms minimum) after VCC exceeds the threshold. Power supply input voltage.
Detailed Descriptions
Reset Timing
The reset signal is asserted-LOW when the VCC signal falls below the threshold trip voltage and remains asserted for 140ms minimum after the VCC has risen above the threshold.
5V VCC 0V
VTH Active Reset Timeout Period 140ms minimum IMP6303
5V RESET 0V
6303_03.eps
Figure 1. Reset Timing Diagram
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(c) 2001 IMP, Inc.
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IMP6303
Application Information
Negative VCC Transients
The IMP6303 protect Ps from brownouts and low VCC. Short duration transients of 100mV amplitude and 20s or less duration typically do not cause a false RESET.
Valid Reset with VCC under 1.1V
To ensure logic inputs connected to the IMP6303 RESET pin are in a known state when VCC is under 1.1V, a 100k pull-down resistor at RESET is needed. The value is not critical.
Bi-directional Reset Pin Interfacing
The IMP6303 can interface with P/C bi-directional reset pins by connecting a 4.7k resistor in series with the IMP6303 reset output and the P/C bi-directional reset pin.
BUF Buffered RESET
VCC
VCC
Power Supply
IMP6303
RESET GND 100k
Power Supply
IMP6303
4.7k RESET GND
C or P RESET Input GND
Bi-directional I/O Pin (Example: 68HC11)
6303_06.eps
6303_04.eps
Figure 2. RESET Valid with VCC Under 1.1V
Figure 3. Bi-directional Reset Pin Interfacing
(c) 2001 IMP, Inc.
Microprocessor Supervisor
5
IMP6303
Package Dimensions
Plastic SOT-23 (3-Pin)
b
Inches Min
A A1 A2 b c D E E1 e e1 L L1 o A B C D E F G H I J K L M A A1 A2 b c D E E1 e e1 L L1
Millimeters Max Min
0.89 0.01 0.88 0.30 0.08 2.80 2.10 1.20 0.95 BSC 1.90 BSC 0.40 0.54 REF 0 4.45 4.32 12.70 0.406 2.41 1.14 1.14 2.16 3.30 0.35 2.36 45 3.00 0.95 0.05 0.90 0.30 0.08 2.80 2.60 1.50 0.95 BSC 1.90 BSC 0.35 0.60 REF 0 8
1811_t04.eps
Max
1.12 0.10 1.02 0.50 0.20 3.04 2.64 1.40
Plastic SOT-23* (3-Pin)
0.035 0.044 0.0004 0.004 0.035 0.040 0.012 0.020 0.003 0.008 0.110 0.120 0.083 0.104 0.047 0.055 0.37 BSC 0.07 BSC 0.016 0.024 0.021 REF 0 8
E1
E
e D
A A2
C
0.60 8 4.95 4.96 15.49 0.559 2.67 1.52 1.52 2.41 3.94 0.51 2.92 60
A1
e1
L L1
SOT-23 (3-Pin).eps
Plastic TO-92 (3-Pin)
A
TO-92 (3-Pin)
0.175 0.170 0.500 0.016 0.095 0.045 0.45 0.085 0.130 0.014 0.093 45 0.195 0.192 0.610 0.022 0.105 0.60 0.060 0.095 0.155 0.020 0.115 60
B M
L
Section A-A C D J Section A-A E K
D
0.118 Typical
F
Plastic SOT-23** (5-Pin)
0.037 0.057 0.001 0.005 0.035 0.050 0.011 0.019 0.003 0.007 0.109 0.117 0.101 0.117 0.058 0.066 0.037 BSC 0.074 BSC 0.013 0.021 0.002 REF 0 8 1.45 0.15 1.30 0.50 0.20 3.00 3.00 1.70
G 1 H 2 3 I Bottom View
TO-92.eps
Plastic SOT-23 (5-Pin)
D e1
E1
E
0.55
e
b
A A2
C
A1
L L1
SOT-23 (5-Pin).eps
6
408-432-9100/www.impweb.com
(c) 2001 IMP, Inc.
S
IMP6303
(c) 2001 IMP, Inc.
Microprocessor Supervisor
7
IMP6303
IMP, Inc. Corporate Headquarters 2830 N. First Street San Jose, CA 95134-2071 Tel: 408-432-9100 Fax: 408-434-5904 e-mail: info@impinc.com http://www.impweb.com
The IMP logo is a registered trademark of IMP, Inc. All other company and product names are trademarks of their respective owners.
(c) 2001 IMP, Inc. Printed in USA Publication #: 1023 Revision: A Issue Date: 10/26/01 Type: Preliminary

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