ASM1811 [ALSC]
Low Power 5V uP Reset Active LOW, Open - Drain Output; 低功耗5V复位低电平有效，开 - 漏输出
| 型号： | ASM1811 |
| 厂家： | 
ALLIANCE SEMICONDUCTOR CORPORATION |
| 描述： | Low Power 5V uP Reset Active LOW, Open - Drain Output |
| 文件： | 总9页 (文件大小：215K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
February 2005
ASM1811
rev 1.4
Low Power 5V µP Reset Active LOW, Open - Drain Output
Applications
General Description
The ASM1811 is a voltage supervisory device with a low-power,
5V µP Reset, active LOW, open-drain output. Maximum supply
current over temperature is a low 20µA.
•
•
•
•
•
•
•
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
Printers
The ASM1811 generates an active LOW reset signal whenever
the monitored supply is out of tolerance. A precision reference
and comparator circuit monitor power supply (VCC) level.
Single board computers
Tolerance level options are 5%, 10% and 15%. When an out-of-
tolerance condition is detected, an internal power-fail signal is
generated which forces an active LOW reset signal. After VCC
Typical Operating Circuit
returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system
microprocessor to stabilize.
VCC
ASM1811
The ASM1811 is designed with a open-drain output stage and
operates over the extended industrial temperature range.
Devices are available in low cost TO-92 and compact surface
mount SOT-23 packages.
Microprocessor
RESET
GND
RESET
Other low power products in this family include the ASM1810/
12/15/16/17, ASM1233D and ASM1233M.
Block Diagram
Key Features
•
Low Supply Current
VCC
2
•20 µA maximum (5.5 V)
•
•
Automatically restarts a microprocessor after power failure
150ms reset delay after VCC returns to an in-tolerance con-
ASM1811
5.5KΩ
Supply
Tolerance
Bias
dition
1
RESET
•
•
Active LOW power-up reset
Delay
150ms
Typical
+
-
Precision temperature-compensated voltage reference and
comparator
•
•
Eliminates external components
Low cost TO-92 and compact surface mount SOT-23 pack-
ages
Reference
•
Operating temperature -40°C to +85°C
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
February 2005
ASM1811
rev 1.4
Pin Configuration
TO-92
SOT-23
ASM1811
1
2
RESET
ASM1811-R
3
GND
VCC
2
1
3
Pin Description
SOT-23
TO-92
Pin Name
Description
Pin #
Pin #
1
2
3
1
2
3
RESET
VCC
Active LOW reset output
Power supply input
Ground
GND
2 of 9
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
February 2005
ASM1811
rev 1.4
Application Information
Operation - Power Monitor
tF
The ASM1811 detects out-of-tolerance power supply
conditions. It resets a processor during power-up, power-
down and issues a reset to the system processor when the
monitored power supply voltage is below the reset threshold.
When an out-of-tolerance VCC voltage is detected, the
VCC
VCCTP (MAX)
VCCTP
VCCTP (MIN)
RESET signal is asserted. On power-up, RESET is kept
active (LOW) for approximately 150ms after the power supply
voltage has reached the selected tolerance. This allows the
power supply and microprocessor to stabilize before RESET
is released.
t
RESET
RPD
tR
V
OL
VCCTP (MAX)
Figure 2: Timing Diagram: Power-Down
VCCTP
VCCTP (MIN)
t
RPU
VCC
V
OH
RESET
Figure 1: Timing Diagram: Power-Up
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Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
February 2005
ASM1811
rev 1.4
Absolute Maximum Ratings
Parameter
Min
Max
Unit
Voltage on VCC
-0.5
-0.5
-40
7
V
V
CC + 0.5
Voltage on RESET
V
Operating Temperature Range
Soldering Temperature (for 10 sec)
Storage Temperature
85
°C
°C
°C
260
125
-55
ESD rating
HBM
MM
2
KV
V
200
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
Supply Voltage
Symbol
VCC
Conditions
Min
Typ
Max
5.5
20
Unit
V
1.2
ICC
VCC < 5.5V, RESET output open
Operating Current
8
µA
V
VCC Trip Point (ASM1811R-5)
VCC Trip Point (ASM1811R-10)
VCC Trip Point (ASM1811R-15)
VCCTP
VCCTP
VCCTP
RP
4.50
4.25
4.00
3.5
4.62
4.35
4.13
5.5
4.75
4.49
4.24
7.5
10
V
V
Internal Pull-up Resistor
Output Capacitance
kΩ
pF
ms
µs
COUT
tRESET
tRPD
RESET Active Time
100
300
150
2
250
5
VCC Detect to RESET Low
VCC Slew Rate
tF
µs
(VCCTP (MAX) to VCCTP (MIN)
V
CC Slew Rate
tR
0
ns
(VCCTP (MIN) to VCCTP (MAX)
VCC Detect to RESET High
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.
4 of 9
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
February 2005
ASM1811
rev 1.4
Family Selection Guide
RESET Time
(ms)
Part #
RESET Voltage (V)
Output Stage
RESET Polarity
ASM1810
ASM1811
ASM1812
ASM1815
ASM1816
ASM1817
ASM1233D
ASM1233M
4.620, 4.370, 4.120
4.620, 4.350, 4.130
4.620, 4.350, 4.130
3.060, 2.880, 2.550
3.060, 2.880, 2.550
3.060, 2.880, 2.550
4.625, 4.375, 4.125
4.625, 4.375, 2.720
150
150
150
150
150
150
350
350
Push-Pull
Open-Drain
Push-Pull
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
5 of 9
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
February 2005
ASM1811
rev 1.4
Package Dimension
Plastic SOT-23 (3-Pin)
D
B
E
H
e
S
A
a
C
e1
A1
L
Inches
Millimeters
Min Max
Min
Max
Plastic SOT-23 (3-Pin)
A
A1
B
0.030
0.002
0.012
0.003
0.110
0.047
0.046
0.006
0.020
0.008
0.120
0.055
0.75
0.05
0.30
0.08
2.80
1.20
1.17
0.15
0.50
0.20
3.04
1.40
C
D
E
e
0.037 BSC
0.075 BSC
0.083
0.95 BSC
1.9 BSC
e1
H
L
0.104
0.024
2.10
0.40
2.64
0.60
0.016
0o
8o
0o
8o
a
S
NA
NA
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Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
February 2005
ASM1811
rev 1.4
To-92 (3-Pin)
Dimensions in Inches
Dimensions in Millimeters
Min
Max
Min
Max
TO-92
A
b
0.175
0.016
0.014
0.175
0.138
0.098
0.045
0.168
0.500
0.095
0.185
0.020
0.016
0.185
0.144
0.102
0.055
0.174
0.585
0.099
4.445
0.406
0.356
4.445
3.505
2.489
1.143
4.269
12.7
4.699
0.508
0.406
4.699
3.658
2.591
1.397
4.420
14.86
2.515
C
φD
E
e
e1
j
L
s
2.413
7 of 9
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
February 2005
ASM1811
rev 1.4
Ordering Information
Device Summary
RESET
RESET
Tolerance
(%)
RESET
Time
(ms)
Output
Voltage
(V)
Open-Drain **
Output Stage
SOT-23
Package
RESET
Polarity
Package
Marking
Part *** Number
TIN - LEAD DEVICES
ASM1811R-5
4.62
4.35
4.13
5
150
150
150
LOW
LOW
LOW
RDLL
RELL
RFLL
ASM1811R-10
10
15
ASM1811R-15
LEAD FREE DEVICES
ASM1811R-5F
4.62
4.35
4.13
5
150
150
150
LOW
LOW
LOW
KDLL
KELL
KFLL
ASM1811R-10F
ASM1811R-15F
10
15
RESET
Output
Voltage
(V)
RESET
Tolerance
(%)
RESET
Time
(ms)
Open-Drain **
Output Stage
TO-92
Package
RESET
Polarity
Package
Marking
Part *** Number
TIN - LEAD DEVICES
ASM1811-5
4.62
4.35
4.13
5
150
150
150
LOW
LOW
LOW
ASM1811-5
ASM1811-10
ASM1811-15
ASM1811-10
10
15
ASM1811-15
LEAD FREE DEVICES
ASM1811-5F
4.62
4.35
4.13
5
150
150
150
LOW
LOW
LOW
ASM1811-5F
ASM1811-10F
ASM1811-15F
ASM1811-10F
ASM1811-15F
10
15
** Internal 5.5kΩ resistor pull-up
** *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL- Lot Code
8 of 9
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
ASM1811
Copyright © Alliance Semiconductor
All Rights Reserved
Part Number: ASM1811
Document Version: 1.4
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
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