ALSC ASM1815-10 Low power, 3.3v/3.0v up reset active low, push-pull output Datasheet

ASM1815
February 2005
rev 1.4
Low Power, 3.3V/3.0V µP Reset Active LOW, Push-Pull Output
General Description
Applications
The ASM1815 is a voltage supervisory device with low-power,
•
Set-top boxes
3.3V/3.0V µP Reset, active LOW, Push-Pull output. Maximum
•
Cellular phones
supply current over temperature is a low 15µA (at 3.6V).
•
PDAs
•
Energy management systems
The ASM1815 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 20%. 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.
ASM1815
The ASM1815 is designed with a push-pull output stage and
Microprocessor
operates over the extended industrial temperature range.
Devices are available in TO-92 and compact surface mount
RESET
RESET
SOT-23 packages.
GND
Other low power products in this family include the ASM1810/
11/12/16/17, ASM1233D and ASM1233M.
Block Diagram
Key Features
•
VCC
Low Supply Current
2
•20 µA maximum (5.5 V)
•15 µA maximum (3.6 V)
•
Automatically restarts a microprocessor after power failure
•
150ms reset delay after VCC returns to an in-tolerance con-
ASM1815
Supply
Tolerance
Bias
dition
+
•
Active LOW power-up reset
-
•
Precision temperature-compensated voltage reference and
comparator
•
Delay
150ms
Typical
Reference
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
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
ASM1815
February 2005
rev 1.4
Pin Configuration
TO-92
SOT-23
RESET
1
ASM1815-R
VCC
ASM1815
3 GND
2
1
2
3
Pin Description
TO-92
SOT-23
Pin #
Pin #
1
Pin Name
Description
1
RESET
Active LOW reset output
2
2
VCC
Power supply input
3
3
GND
Ground
Low Power, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
2 of 9
ASM1815
February 2005
rev 1.4
tF
VCC
Application Information
VCCTP (MAX)
Operation - Power Monitor
The
ASM1815
detects
out-of-tolerance
power
VCCTP
supply
VCCTP (MIN)
conditions. It resets a processor during power-up, powermonitored power supply voltage is below the reset threshold.
When an out-of-tolerance VCC voltage is detected, the
tRPD
RESET
RESET signal is asserted. On power-up, RESET is kept
~
~
down and issues a reset to the system processor when the
active (LOW) for approximatley 150ms after the power supply
voltage has reached the selected tolerance. This allows the
power supply and microprocessor to stablize before RESET
is released.
VOL
tR
Figure 2: Timing Diagram: Power-Down
VCCTP (MAX)
VCCTP (MIN)
VCCTP
Output Conditions
The ASM1815 active LOW reset signal is valid as long as
VCC remains below 1.2V. The RESET output on the
~
VCC
ASM1815 uses a push-pull drive stage that can maintain a
tRPU
valid output below 1.2V. To sink current with VCC below 1.2V,
a resistor can be connected from the reset pin (RESET) to
Ground (see Figure 3). This configuration will give a valid
VOH
~
RESET
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
Figure 1: Timing Diagram: Power-Up
should be adequate to maintain a valid connection.
ASM1815
Microprocessor
RESET
RESET
100kΩ
Figure 3: RESET Valid to 0V VCC
Low Power, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
3 of 9
ASM1815
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
Conditions
Min
Typ
Max
Unit
5.5
V
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
8
20
µA
Operating Current
ICC
VCC < 3.6V, RESET output open
6
15
µA
1.2
VCC - 0.5V
VCC - 0.1V
V
350
µA
+10
mA
VCC Trip Point (ASM1815R-5)
VCCTP
2.98
3.06
3.15
V
VCC Trip Point (ASM1815R-10)
VCCTP
2.80
2.88
2.97
V
VCC Trip Point (ASM1815R-20)
VCCTP
2.47
2.55
2.64
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
250
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, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
4 of 9
ASM1815
February 2005
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
S
0
o
8
NA
o
0
o
8
o
NA
Low Power, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
5 of 9
ASM1815
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, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
6 of 9
ASM1815
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, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
7 of 9
ASM1815
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
ASM1815R-5
3.06
5
150
‹
‹
LOW
RJLL
ASM1815R-10
2.88
10
150
‹
‹
LOW
RKLL
ASM1815R-20
2.55
20
150
‹
‹
LOW
RLLL
ASM1815R-5F
3.06
5
150
‹
‹
LOW
KJLL
ASM1815R-10F
2.88
10
150
‹
‹
LOW
KKLL
ASM1815R-20F
2.55
20
150
‹
‹
LOW
KLLL
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
ASM1815-5
3.06
5
150
‹
‹
LOW
ASM1815-5
ASM1815-10
2.88
10
150
‹
‹
LOW
ASM1815-10
ASM1815-20
2.55
20
150
‹
‹
LOW
ASM1815-20
ASM1815-5F
3.06
5
150
‹
‹
LOW
ASM1815-5F
ASM1815-10F
2.88
10
150
‹
‹
LOW
ASM1815-10F
ASM1815-20F
2.55
20
150
‹
‹
LOW
ASM1815-20F
LEAD FREE DEVICES
* *Add /T to Part Number for Tape and Reel (i.e ASM18xx-x/T)
LL- Lot Code
Low Power, 3.3V/3.0V µP Reset
Notice: The information in this document is subject to change without notice
8 of 9
ASM1815
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: ASM1815
Document Version: 1.4
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