ASM8500EZR-27-T [ALSC]
Power Supply Support Circuit, Fixed, 1 Channel, PBCY3, TO-92, 3 PIN;
| 型号： | ASM8500EZR-27-T |
| 厂家： | 
ALLIANCE SEMICONDUCTOR CORPORATION |
| 描述： | Power Supply Support Circuit, Fixed, 1 Channel, PBCY3, TO-92, 3 PIN |
| 文件： | 总9页 (文件大小：138K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
May 2005
ASM8500
rev 1.7
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
•
•
Printers
General Description
Single board computers
The ASM8500 is a voltage supervisory device with a low-power,
5V/3.3V µP Reset, active LOW, open-drain output. Typical
supply current over temperature is a low 6µA.
Typical Operating Circuit
The ASM8500 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. Reset
VCC
ASM8500
threshold tolerance level is ±1.7% at room temperature. When
an out-of-tolerance condition is detected, an internal power-fail
signal is generated which forces an active LOW reset signal.
After VCC returns to an in-tolerance condition, the reset signal
Microprocessor
RESET
GND
RESET
remains active for 1.5ms to allow the power supply and system
microprocessor to stabilize.
The ASM8500 is designed with a open-drain output stage and
operates over the extended industrial temperature range.
Devices are available in compact surface mount SOT-89 and 3-
lead TO-92 packages.
Block Diagram
VCC
Other low power products in this family include the ASM1810/
11/12/15/16/17 and ASM1233D/M.
ASM8500
5.5ΚΩ
Supply
Tolerance
Bias
Key Features
RESET
•
Low Supply Current
Delay
1.5ms
Typical
+
-
• 6 µA typical (5.5 V)
•
•
Automatically restarts a microprocessor after power failure
1.5ms reset delay after VCC returns to an in-tolerance con-
Reference
dition
•
•
Active LOW power-up reset
Precision temperature-compensated voltage reference and
comparator
GND
•
•
•
Eliminates external components
Compact surface mount SOT-89 and TO-92 packages
Operating temperature -40°C to +85°C
Applications
•
•
•
•
•
Set-top boxes
Cellular phones
PDAs
Energy management systems
Embedded control systems
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
May 2005
ASM8500
rev 1.7
Pin Configuration
SOT-89
TO- 92
ASM8500-25
ASM8500
1
3
2
VCC
RESET
GND
2
1
3
Pin Description
Pin #
Pin Name
Description
VCC
1
2
3
Power supply input
Ground
GND
RESET
Active LOW reset output
2 of 9
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
May 2005
ASM8500
rev 1.7
Application Information
Operation - Power Monitor
tF
The ASM8500 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 1.5ms 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
3 of 9
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
May 2005
ASM8500
rev 1.7
Absolute Maximum Ratings
Parameter
Min
Max
Unit
Voltage on VCC
-0.5
-0.5
-40
7
V
VCC + 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
200
KV
V
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
Conditions
Min
Typ
Max
Unit
VCC
1
5.5
V
RESET asserted ( VCC >= 4.5V
VOL
Output Voltage
-
-
0.4
V
ISINK = 3.2 mA)
IOL
ICC
Output Current
Output = 0.4V
+10
mA
µA
VCC < 5.5V, RESET output open
Operating Current
6
ASM8500-45
ASM8500-42
ASM8500-39
ASM8500-29
ASM8500-27
ASM8500-25
4.388
4.095
3.803
2.857
2.633
2.438
3.5
4.5
4.2
3.9
2.93
2.7
2.5
5.0
4.613
4.305
3.998
3.003
2.768
2.563
7.5
V
CC Trip Point
VCCTP
V
RP
Internal Pull-up Resistor
Output Capacitance
RESET Active Time
kΩ
pF
ms
µs
COUT
tRESET
tRPD
10
5
0.5
1.5
2
V
CC Detect to RESET Low
CC Slew Rate
5
V
tF
300
µs
(VCCTP (MAX) to VCCTP (MIN)
VCC Slew Rate
tR
0
ns
(VCCTP (MIN) to VCCTP (MAX)
VCC Detect to RESET High
tRPU
tr = 5µs
0.5
1.5
5
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 / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
May 2005
ASM8500
rev 1.7
Ordering Information
Package Marking
(LL Lot Code)
Part # **
RESET Voltage (V)
Temperature Range
Package
TIN-LEAD DEVICES
ASM8500EUR-45
ASM8500EUR-42
ASM8500EUR-29
ASM8500EUR-27
ASM8500EUR-39
ASM8500EUR-25
ASM8500EZR-45
ASM8500EZR-42
ASM8500EZR-29
ASM8500EZR-27
ASM8500EZR-39
ASM8500EZR-25
LEAD FREE DEVICES
ASM8500EUR-45F
ASM8500EUR-42F
ASM8500EUR-29F
ASM8500EUR-27F
ASM8500EUR-39F
ASM8500EUR-25F
ASM8500EZR-45F
ASM8500EZR-42F
ASM8500EZR-29F
ASM8500EZR-27F
ASM8500EZR-39F
ASM8500EZR-25F
4.5
4.2
2.93
2.7
3.9
2.5
4.5
4.2
2.93
2.7
3.9
2.5
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
TO-92
U6LL
U1LL
U2LL
U3LL
U4LL
U5LL
ASM8500EZR-45
ASM8500EZR-42
ASM8500EZR-29
ASM8500EZR-27
ASM8500EZR-39
ASM8500EZR-25
TO-92
TO-92
TO-92
TO-92
TO-92
4.5
4.2
2.93
2.7
3.9
2.5
4.5
4.2
2.93
2.7
3.9
2.5
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
-40°C to 85°C
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
SOT-89
TO-92
J6LL
J1LL
J2LL
J3LL
J4LL
J5LL
ASM8500EZR-45F
ASM8500EZR-42F
ASM8500EZR-29F
ASM8500EZR-27F
ASM8500EZR-39F
ASM8500EZR-25F
TO-92
TO-92
TO-92
TO-92
TO-92
Notes:
•
•
For parts to be packed in Tape and Reel, add “-T” at the end of the part number.
Alliance Semiconductor's lead free parts are RoHS complaint.
5 of 9
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
May 2005
ASM8500
rev 1.7
Family Selection Guide
RESET Time
(ms)
Part #
RESET Voltage (V)
Output Stage
RESET Polarity
ASM1810
ASM1811
ASM1812
ASM1815
ASM1816
ASM1817
ASM1233D
ASM1233M
ASM8500
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
4.5, 4.2, 3.9, 2.93, 2.7,2.5,
150
150
150
150
150
150
350
350
1.5
Push-Pull
Open-Drain
Push-Pull
LOW
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
LOW
Push-Pull
Open-Drain
Push-Pull
Open-Drain
Open-Drain
Open-Drain
6 of 9
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
May 2005
ASM8500
rev 1.7
Package Dimensions
Plastic SOT-89
Dimensions
Symbol
Inches
Millimeters
Min
Max
0.063
0.022
0.019
0.017
0.181
0.072
0.102
0.09
Min
Max
1.60
A
B
0.055
0.017
0.014
0.014
0.173
0.064
0.09
1.397
0.432
0.356
0.356
4.294
1.626
2.286
2.134
0.559
0.483
0.432
4.597
1.829
2.591
2.286
B1
C
D
D1
E
E1
e
0.084
0.059 BSC
0.118 BSC
1.499 BSC
2.997 BSC
e1
H
0.155
0.035
0.167
0.047
3.937
0.889
4.242
1.194
L
7 of 9
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
May 2005
ASM8500
rev 1.7
TO-92
Dimensions
Symbol
Inches
Millimeters
Min
Max
Min
Max
A
b
0.175
0.016
0.014
0.175
0.098
0.045
0.138
0.168
0.500
0.095
0.185
0.020
0.016
0.185
0.102
0.055
0.144
0.174
0.585
0.099
4.445
0.406
0.356
4.445
2.489
1.143
3.505
4.269
12.7
4.699
0.508
0.406
4.699
2.591
1.397
3.658
4.420
14.86
2.515
C
φD
e
e1
E
j
L
s
2.413
8 of 9
Low Power 5V / 3.3V µP Reset Active LOW, Open - Drain Output
Notice: The information in this document is subject to change without notice
ASM8500
Copyright © Alliance Semiconductor
All Rights Reserved
Preliminary Information
Part Number: ASM8500
Document Version: 1.7
Alliance Semiconductor Corporation
2575, Augustine Drive,
Santa Clara, CA 95054
Tel: 408 - 855 - 4900
Fax: 408 - 855 - 4999
www.alsc.com
© Copyright 2003 Alliance Semiconductor Corporation. All rights reserved. Our three-point logo, our name and Intelliwatt are trademarks or
registered trademarks of Alliance. All other brand and product names may be the trademarks of their respective companies. Alliance reserves the
right to make changes to this document and its products at any time without notice. Alliance assumes no responsibility for any errors that may
appear in this document. The data contained herein represents Alliance's best data and/or estimates at the time of issuance. Alliance reserves the
right to change or correct this data at any time, without notice. If the product described herein is under development, significant changes to these
specifications are possible. The information in this product data sheet is intended to be general descriptive information for potential customers and
users, and is not intended to operate as, or provide, any guarantee or warrantee to any user or customer. Alliance does not assume any responsibility
or liability arising out of the application or use of any product described herein, and disclaims any express or implied warranties related to the sale
and/or use of Alliance products including liability or warranties related to fitness for a particular purpose, merchantability, or infringement of any
intellectual property rights, except as express agreed to in Alliance's Terms and Conditions of Sale (which are available from Alliance). All sales of
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convey a license under any patent rights, copyrights; mask works rights, trademarks, or any other intellectual property rights of Alliance or third
parties. Alliance does not authorize its products for use as critical components in life-supporting systems where a malfunction or failure may
reasonably be expected to result in significant injury to the user, and the inclusion of Alliance products in such life-supporting systems implies that
the manufacturer assumes all risk of such use and agrees to indemnify Alliance against all claims arising from such use.
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