ALSC ASM1811R

ASM1811
February 2005
rev 1.4
Low Power 5V µP Reset Active LOW, Open - Drain Output
General Description
Applications
The ASM1811 is a voltage supervisory device with a low-power,
•
Set-top boxes
5V µP Reset, active LOW, open-drain output. Maximum supply
•
Cellular phones
current over temperature is a low 20µA.
•
PDAs
•
Energy management systems
The ASM1811 generates an active LOW reset signal whenever
•
Embedded control systems
the monitored supply is out of tolerance. A precision reference
•
Printers
and comparator circuit monitor power supply (VCC) level.
Tolerance level options are 5%, 10% and 15%. When an out-of-
•
Single board computers
tolerance condition is detected, an internal power-fail signal is
Typical Operating Circuit
generated which forces an active LOW reset signal. After VCC
returns to an in-tolerance condition, the reset signal remains
VCC
active for 150ms to allow the power supply and system
microprocessor to stabilize.
ASM1811
The ASM1811 is designed with a open-drain output stage and
Microprocessor
operates over the extended industrial temperature range.
Devices are available in low cost TO-92 and compact surface
RESET
mount SOT-23 packages.
Other low power products in this family include the ASM1810/
RESET
GND
12/15/16/17, ASM1233D and ASM1233M.
Block Diagram
Key Features
•
Low Supply Current
VCC
•20 µA maximum (5.5 V)
•
Automatically restarts a microprocessor after power failure
•
150ms reset delay after VCC returns to an in-tolerance con-
•
Active LOW power-up reset
•
Precision temperature-compensated voltage reference and
dition
2
Eliminates external components
•
Low cost TO-92 and compact surface mount SOT-23 pack-
•
Operating temperature -40°C to +85°C
5.5KΩ
1
+
-
comparator
•
ASM1811
Supply
Tolerance
Bias
Delay
150ms
Typical
Reference
ages
3
GND
Alliance Semiconductor
2575 Augustine Drive . Santa Clara, CA 95054 . Tel: 408.855.4900 . Fax: 408.855.4999 . www.alsc.com
Notice: The information in this document is subject to change without notice
RESET
ASM1811
February 2005
rev 1.4
Pin Configuration
TO-92
SOT-23
ASM1811
RESET
1
ASM1811-R 3
VCC
GND
2
1
2
3
Pin Description
SOT-23
TO-92
Pin #
Pin #
1
Pin Name
Description
1
RESET
Active LOW reset output
2
2
VCC
Power supply input
3
3
GND
Ground
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
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ASM1811
February 2005
rev 1.4
Application Information
Operation - Power Monitor
The
ASM1811
detects
out-of-tolerance
power
supply
conditions. It resets a processor during power-up, power-
tF
VCC
VCCTP (MAX)
down and issues a reset to the system processor when the
VCCTP
monitored power supply voltage is below the reset threshold.
VCCTP (MIN)
When an out-of-tolerance VCC voltage is detected, the
voltage has reached the selected tolerance. This allows the
RESET
tRPD
~
~
RESET signal is asserted. On power-up, RESET is kept
active (LOW) for approximately 150ms after the power supply
power supply and microprocessor to stabilize before RESET
is released.
VOL
tR
VCCTP (MAX)
VCCTP (MIN)
~
VCC
Figure 2: Timing Diagram: Power-Down
VCCTP
tRPU
VOH
~
RESET
Figure 1: Timing Diagram: Power-Up
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
3 of 9
ASM1811
February 2005
rev 1.4
Absolute Maximum Ratings
Parameter
Min
Max
Unit
Voltage on VCC
-0.5
7
V
Voltage on RESET
-0.5
VCC + 0.5
V
Operating Temperature Range
-40
85
°C
260
°C
125
°C
2
200
KV
V
Soldering Temperature (for 10 sec)
Storage Temperature
-55
ESD rating
HBM
MM
NOTE: These are stress ratings only and functional use is not implied. Exposure to absolute maximum ratings for prolonged
periods of time may affect device reliability.
Electrical Characteristics
Unless otherwise noted, VCC = 1.2V to 5.5V and specifications are over the operating temperature range of -40°C to +85°C. All voltages are
referenced to ground
Parameter
Symbol
Supply Voltage
VCC
Operating Current
ICC
Conditions
Min
Typ
Max
Unit
5.5
V
8
20
µA
1.2
VCC < 5.5V, RESET output open
VCC Trip Point (ASM1811R-5)
VCCTP
4.50
4.62
4.75
V
VCC Trip Point (ASM1811R-10)
VCCTP
4.25
4.35
4.49
V
VCC Trip Point (ASM1811R-15)
VCCTP
4.00
4.13
4.24
V
RP
3.5
5.5
7.5
kΩ
10
pF
150
250
ms
2
5
µs
Internal Pull-up Resistor
Output Capacitance
COUT
RESET Active Time
tRESET
VCC Detect to RESET Low
tRPD
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN)
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX)
VCC Detect to RESET High
100
tF
300
µs
tR
0
ns
tRPU
tr = 5µs
100
150
300
ms
Note: The tF value is for reference in defining values for tRPD and should not be considered for proper operation or use.
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
4 of 9
ASM1811
February 2005
rev 1.4
Family Selection Guide
Part #
RESET Voltage (V)
RESET Time
(ms)
Output Stage
RESET Polarity
ASM1810
4.620, 4.370, 4.120
150
Push-Pull
LOW
ASM1811
4.620, 4.350, 4.130
150
Open-Drain
LOW
ASM1812
4.620, 4.350, 4.130
150
Push-Pull
HIGH
ASM1815
3.060, 2.880, 2.550
150
Push-Pull
LOW
ASM1816
3.060, 2.880, 2.550
150
Open-Drain
LOW
ASM1817
3.060, 2.880, 2.550
150
Push-Pull
HIGH
ASM1233D
4.625, 4.375, 4.125
350
Open-Drain
LOW
ASM1233M
4.625, 4.375, 2.720
350
Open-Drain
LOW
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
5 of 9
ASM1811
February 2005
rev 1.4
Package Dimension
Plastic SOT-23 (3-Pin)
D
B
E
H
e
S
A
a
L
Inches
Min
C
e1
A1
Millimeters
Max
Min
Max
Plastic SOT-23 (3-Pin)
A
0.030
0.046
0.75
1.17
A1
0.002
0.006
0.05
0.15
B
0.012
0.020
0.30
0.50
C
0.003
0.008
0.08
0.20
D
0.110
0.120
2.80
3.04
E
0.047
0.055
1.20
1.40
e
0.037 BSC
0.95 BSC
e1
0.075 BSC
1.9 BSC
H
0.083
0.104
2.10
2.64
L
0.016
0.024
0.40
0.60
a
0
S
o
o
8
NA
0
o
o
8
NA
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
6 of 9
ASM1811
February 2005
rev 1.4
To-92 (3-Pin)
Dimensions in Inches
Min
Max
Dimensions in Millimeters
Min
Max
TO-92
A
0.175
0.185
4.445
4.699
b
0.016
0.020
0.406
0.508
C
0.014
0.016
0.356
0.406
φD
0.175
0.185
4.445
4.699
E
0.138
0.144
3.505
3.658
e
0.098
0.102
2.489
2.591
e1
0.045
0.055
1.143
1.397
j
0.168
0.174
4.269
4.420
L
0.500
0.585
12.7
14.86
s
0.095
0.099
2.413
2.515
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
7 of 9
ASM1811
February 2005
rev 1.4
Ordering Information
Device Summary
RESET
Output
Voltage
(V)
RESET
Tolerance
(%)
RESET
Time
(ms)
Open-Drain **
Output Stage
SOT-23
Package
RESET
Polarity
Package
Marking
ASM1811R-5
4.62
5
150
‹
‹
LOW
RDLL
ASM1811R-10
4.35
10
150
‹
‹
LOW
RELL
ASM1811R-15
4.13
15
150
‹
‹
LOW
RFLL
ASM1811R-5F
4.62
5
150
‹
‹
LOW
KDLL
ASM1811R-10F
4.35
10
150
‹
‹
LOW
KELL
ASM1811R-15F
4.13
15
150
‹
‹
LOW
KFLL
Part *** Number
RESET
Output
Voltage
(V)
RESET
Tolerance
(%)
RESET
Time
(ms)
Open-Drain **
Output Stage
TO-92
Package
RESET
Polarity
Package
Marking
ASM1811-5
4.62
5
150
‹
‹
LOW
ASM1811-5
ASM1811-10
4.35
10
150
‹
‹
LOW
ASM1811-10
ASM1811-15
4.13
15
150
‹
‹
LOW
ASM1811-15
ASM1811-5F
4.62
5
150
‹
‹
LOW
ASM1811-5F
ASM1811-10F
4.35
10
150
‹
‹
LOW
ASM1811-10F
ASM1811-15F
4.13
15
150
‹
‹
LOW
ASM1811-15F
Part *** Number
TIN - LEAD DEVICES
LEAD FREE DEVICES
TIN - LEAD DEVICES
LEAD FREE DEVICES
** Internal 5.5kΩ resistor pull-up
** *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL- Lot Code
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
8 of 9
ASM1811
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1811
Document Version: 1.4
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