ALSC ASM1812-15F Low power 5v up reset active high, push-pull output Datasheet

ASM1812
February 2005
rev 1.4
Low Power 5V µP Reset Active HIGH, Push-Pull Output
General Description
Applications
The ASM1812 is a voltage supervisory device with low-power,
•
Set-top boxes
5V µP Reset, active HIGH, Push-Pull output. Maximum supply
•
Cellular phones
current over temperature is a low 20µA.
•
PDAs
•
Energy management systems
The ASM1812 issues an active HIGH 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 HIGH reset signal. After VCC
returns to an in-tolerance condition, the reset signal remains
active for 150ms to allow the power supply and system
VCC
microprocessor to stabilize.
ASM1812
The ASM1812 is designed with a push-pull output stage and
operates over the extended industrial temperature range.
Microprocessor
Devices are available in TO-92 and compact surface mount
SOT-23 packages.
RESET
RESET
Other low power products in this family include the ASM1810/
GND
11/15/16/17, ASM1233D and ASM1233M.
Key Features
•
Low Supply Current
Block Diagram
•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 HIGH power-up reset
•
Precision temperature-compensated voltage reference and
dition
VCC
2
Supply
Tolerance
Bias
+
comparator
•
Eliminates external components
•
TO-92 and compact surface mount SOT-23 package
•
Push-Pull output for minimum current drain
•
Operating temperature -40°C to +85°C
ASM1812
-
Delay
150ms
Typical
1
Reference
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
February 2005
ASM1812
rev 1.4
Pin Configuration
TO-92
SOT-23
RESET
ASM1812
1
ASM1812-R
VCC
3
GND
2
1
2
3
Pin Description
TO-92
SOT-23
Pin #
Pin #
1
Pin Name
Description
1
RESET
Active HIGH 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
2 of 9
ASM1812
February 2005
rev 1.4
Application Information
Operation - Power Monitor
The
ASM1812
detects
out-of-tolerance
power
tR
supply
VCCTP (MAX)
conditions. It resets a processor during power-up, powerdown and issues a reset to the system processor when the
VCCTP
VCCTP (MIN)
monitored power supply voltage is below the reset threshold.
When an out-of-tolerance VCC voltage is detected, the
~
~
RESET signal is asserted. On power-up, RESET is kept
active (HIGH) for approximately 150ms after the power
supply voltage has reached the selected tolerance. This
allows the power supply and microprocessor to stabilize
tRPU
VCC
~
~
before RESET is released.
VOL
RESET
ASM1812
Figure 2: Timing Diagram: Power-Up
Microprocessor
RESET
RESET
Figure 1: Typical Application
VCC
tF
VCCTP (MAX)
VCCTP
VCCTP (MIN)
~~
tRPD
VOH
~~
RESET
RESET Slews with VCC
Figure 3: Timing Diagram: Power-Down
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
3 of 9
February 2005
ASM1812
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
toground
Parameter
Symbol
Conditions
Supply Voltage
VCC
Output Voltage
VOH
IOUT < 500 µA
Output Current
IOH
Output = 2.4V, VCC > 2.7V
Output Current
IOL
Output = 0.4V, VCC > 2.7V
Operating Current
ICC
VCC < 5.5V, RESET output
Min
Typ
1.2
VCC - 0.5V
Max
Unit
5.5
V
VCC - 0.1V
V
350
µA
+10
mA
8
20
µA
VCC Trip Point (ASM1812R-5)
VCCTP
4.50
4.62
4.75
V
VCC Trip Point (ASM1812R-10)
VCCTP
4.25
4.35
4.49
V
VCC Trip Point (ASM1812R-15)
VCCTP
4.00
4.13
4.24
V
Output Capacitance
COUT
10
pF
RESET Active Time
tRESET
150
250
ms
2
5
µs
VCC Detect to RESET HIGH
100
tRPD
VCC Slew Rate
tF
300
µs
VCC Slew Rate
tR
0
ns
VCC Detect to RESET LOW
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
February 2005
ASM1812
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
February 2005
ASM1812
rev 1.4
Package Dimension
Plastic SOT-23 (3-Pin)
D
B
E
H
e
S
A
a
A1
C
e1
L
Inches
Millimeters
Min
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
o
0
o
8
o
0
8
S
NA
o
NA
Low Power 5V µP Reset
Notice: The information in this document is subject to change without notice
6 of 9
February 2005
ASM1812
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
February 2005
ASM1812
rev 1.4
Ordering Codes
Device Summary
RESET
Output
Voltage
(V)
RESET
Tolerance
(%)
RESET
Time
(ms)
Push-Pull
Output Stage
SOT-23
Package
RESET
Polarity
Package
Marking
ASM1812R-5
4.62
5
150
‹
‹
HIGH
RGLL
ASM1812R-10
4.35
10
150
‹
‹
HIGH
RHLL
ASM1812R-15
4.13
15
150
‹
‹
HIGH
RILL
ASM1812R-5F
4.62
5
150
‹
‹
HIGH
KGLL
ASM1812R-10F
4.35
10
150
‹
‹
HIGH
KHLL
ASM1812R-15F
4.13
15
150
‹
‹
HIGH
KILL
Part ** Number
RESET
Output
Voltage
(V)
RESET
Tolerance
(%)
RESET
Time
(ms)
Push-Pull
Output Stage
TO-92
Package
RESET
Polarity
Package
Marking
ASM1812-5
4.62
5
150
‹
‹
HIGH
ASM1812-5
ASM1812-10
4.35
10
150
‹
‹
HIGH
ASM1812-10
ASM1812-15
4.13
15
150
‹
‹
HIGH
ASM1812-15
ASM1812-5F
4.62
5
150
‹
‹
HIGH
ASM1812-5F
ASM1812-10F
4.35
10
150
‹
‹
HIGH
ASM1812-10F
ASM1812-15F
4.13
15
150
‹
‹
HIGH
ASM1812-15F
Part ** Number
TIN - LEAD DEVICES
LEAD FREE DEVICES
TIN - LEAD DEVICES
LEAD FREE DEVICES
** 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
ASM1812
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: ASM1812
Document Version: 1.4
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