ALSC ASM1810-5F/T Low power, 5v up reset active low, push-pull output Datasheet

ASM1810
February 2005
rev 1.4
Low Power, 5V µP Reset
- Active LOW, Push-Pull Output
General Description
Key Features
The ASM1810 is a voltage supervisor with low-power, 5V µP
•
active LOW Reset, Push-Pull output. Maximum supply current
over temperature is a low 20µA.
Low Supply Current
•20 µA maximum (5.5 V)
•
Automatically restarts a microprocessor after power failure
•
150ms reset delay after VCC returns to an in-tolerance con-
the monitored supply is out of tolerance. A precision reference
•
Active LOW power-up reset
and comparator circuit monitor power supply (VCC) level.
•
Precision temperature-compensated voltage reference and
The ASM1810 generates an active LOW reset signal whenever
dition
comparator
Tolerance level options are 5%, 10% and 15%. When an out-oftolerance condition is detected, an internal power-fail signal is
•
Eliminates external components
generated which forces an active LOW reset signal. After VCC
•
Low cost TO-92 and compact surface mount SOT-23 pack-
active for 150ms to allow the power supply and system
•
Push-Pull output for minimum current drain
microprocessor to stabilize.
•
Operating temperature -40°C to +85°C
The ASM1810 is designed with a push-pull output stage and
Applications
operates over the extended industrial temperature range.
•
Set-top boxes
Devices are available in low cost TO-92 and compact surface
•
Cellular phones
mount SOT-23 packages.
•
PDAs
age
returns to an in-tolerance condition, the reset signal remains
•
Energy management systems
Other low power products in this family include the ASM1811/
•
Embedded control systems
12/15/16/17, ASM1233D and ASM1233M.
•
Printers
•
Single board computers
Block Diagram
Typical Operating Circuit
VCC
2
VCC
ASM1810
+
Microprocessor
RESET
ASM1810
Supply
Tolerance
Bias
RESET
-
Delay
150ms
Typical
Reference
GND
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
1
RESET
ASM1810
February 2005
rev 1.4
Pin Configuration
TO-92
SOT-23
ASM1810
RESET
1
ASM1810-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
2 of 9
ASM1810
February 2005
rev 1.4
Application Information
Operation - Power Monitor
The
ASM1810
detects
tR
out-of-tolerance
power
supply
VCCTP (MAX)
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 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
VCCTP
VCCTP (MIN)
tRPU
VCC
and microprocessor to stabilize before RESET is released.
VOH
RESET
Microprocessor
RESET
~
ASM1810
Figure 2: Timing Diagram: Power-Up
RESET
100kΩ
Figure 1: RESET Valid to 0V VCC
tF
VCC
VCCTP (MAX)
VCCTP
The ASM1810 active LOW reset signal is valid as long as VCC
remains above 1.2V. However the RESET output on the
ASM1810 uses a push-pull drive stage that can maintain a valid
output below 1.2V. To sink current with VCC below 1.2V, a
RESET
tRPD
~
~
VCCTP (MIN)
Output Conditions
resistor can be connected from the reset pin (RESET) to
Ground (see Figure 1). This configuration will give a valid value
on the RESET output with VCC approaching 0V. During both
power up and down, this configuration will draw current when
the RESET is in the high state. A value of 100kΩ should be
VOL
adequate to maintain a valid connection.
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
ASM1810
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 = 1.25V to 5.5V and specifications are over the operating temperature range of -400c to +850c. All voltages are referenced to ground
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 open
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 (ASM1810R-5)
VCCTP
4.50
4.62
4.75
V
VCC Trip Point (ASM1810R-10)
VCCTP
4.25
4.37
4.49
V
VCC Trip Point (ASM1810R-15)
VCCTP
4.00
4.12
4.24
V
Output Capacitance
COUT
10
pF
VCC Detect to RESET Low
tRPD
5
µs
VCC Slew Rate
(VCCTP (MAX) to VCCTP (MIN)
VCC Slew Rate
(VCCTP (MIN) to VCCTP (MAX)
VCC Detect to RESET High
2
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
ASM1810
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
ASM1810
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
ASM1810
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
ASM1810
February 2005
rev 1.4
Ordering Information
Device Summary
Part ** Number
RESET
Output
Voltage (V)
RESET
Tolerance (%)
RESET
Time (ms)
Push-Pull
Output
Stage
SOT-23
Package
RESET
Polarity
Package Marking
TIN - LEAD DEVICES
ASM1810R-5
4.62
5
150
‹
‹
LOW
RALL
ASM1810R-10
4.37
10
150
‹
‹
LOW
RBLL
ASM1810R-15
4.12
15
150
‹
‹
LOW
RCLL
ASM1810R-5F
4.62
5
150
‹
‹
LOW
KALL
ASM1810R-10F
4.37
10
150
‹
‹
LOW
KBLL
ASM1810R-15F
4.12
15
150
‹
‹
LOW
KCLL
Part ** Number
RESET
Output
Voltage (V)
RESET
Tolerance (%)
RESET
Time (ms)
Push-Pull
Output
Stage
TO-92
Package
RESET
Polarity
Package Marking
LEAD FREE DEVICES
TIN - LEAD DEVICES
ASM1810-5
4.62
5
150
‹
‹
LOW
ASM1810-5
ASM1810-10
4.37
10
150
‹
‹
LOW
ASM1810-10
ASM1810-15
4.12
15
150
‹
‹
LOW
ASM1810-15
ASM1810-5F
4.62
5
150
‹
‹
LOW
ASM1810-5F
ASM1810-10F
4.37
10
150
‹
‹
LOW
ASM1810-10F
ASM1810-15F
4.12
15
150
‹
‹
LOW
ASM1810-15F
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
ASM1810
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: ASM1810
Document Version: 1.4
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