Datasheet ASM1233A Datasheet (Alliance Semiconductor)

查询ASM1233A供应商

November 2003

rev 1.0

General Description

The ASM1233A is a voltage supervisor with low-power, 3.3V

µP Reset, with an active LOW, open-drain output. Maximum

supply current over temperature is a low 15µA.

The ASM1233A generates an active LOW reset signal

whenever the monitored supply is out of tolerance. A precision

reference and comparator circuit monitor power supply (V

level. The tolerance is 15% for the 3.3V, ASM1233A. When an

out-of-tolerance condition is detected, an internal power-fail

signal is generated which forces an active LOW reset signal.

After V

remains active for 350ms to allow the power supply and system

microprocessor to stabilize.

The ASM1233A is designed with a open-drain output stage and

operates over the extended industrial temperature range.

Devices are available in compact SOT-223 packages.

returns to an in-tolerance condition, the reset signal

CC

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

CC

• Embedded control systems

• Printers

• Single board computers

Typical Operating Circuit

)

V

CC

ASM1233A

RESET

GND

ASM1233A

Microprocessor

RESET

Other low power products in this family include the ASM1810/

11/12/15/16/17, ASM1233D, and ASM1233M

Key Features

• Low Supply Current

•15µA maximum (3.6 V)

• Automatically restarts a microprocessor after power failure

• 350ms reset delay after V

dition

• Active LOW power-up reset, 5kΩ internal pull-up

• Precision temperature-compensated voltage reference and

comparator

• Eliminates external components

• Low-cost SOT-223 package

• Operating temperature -40°C to +85°C

returns to an in-tolerance con-

CC

Applications

• Set-top boxes

• Cellular phones

•PDAs

• Energy management systems

Alliance Semiconductor

2575 Augustine Drive . Santa Clara, CA 95054 . Tel: [phone] . Fax: [phone] . www.alsc.com

Notice: The information in this document is subject to change without notice

Block Diagram

V

CC

ASM1233A

5.0kΩ

Supply

Tolerance

Bias

Delay

+

+

-

-

Reference

Delay

350ms

Typical

Typical

GND

RESET

November 2003

rev 1.0

Pin Configuration

ASM1233A

SOT-223

RESET

GND

Pin Description

Pin# Pin Name Description

1 GND Ground.

2 RESET

3

4 GND Ground.

V

CC

Active LOW reset output.

Power supply input.

2

4

V

CC

3

ASM1233A

1

GND

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

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November 2003

rev 1.0

Application Information

Operation - Power Monitor

The ASM1233A detects out-of-tolerance power supply

conditions. It resets a processor during power-up, power-

down and generates a reset to the system processor when

the monitored power supply voltage is below the reset

threshold. When an out-of-tolerance V

the RESET signal is asserted. On power-up, RESET is kept

active (LOW) for approximatley 350ms after the power supply

voltage has reached the selected tolerance. This allows the

power supply and microprocessor to stablize before RESET

is released.

t

(MIN)

V

CCTP

voltage is detected,

CC

R

V

CCTP

V

CCTP

(MAX)

t

V

CCTP

F

V

t

RPD

V

OL

V

CC

V

(MAX)

CCTP

RESET

Figure 2: Timing Diagram: Power-Down

ASM1233A

(MIN)

CCTP

~

~

~

~

V

CC

~

RESET

Figure 1: Timing Diagram: Power-Up

~

t

RPU

V

OH

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

3 of 9

November 2003

rev 1.0

Absolute Maximum Ratings

Parameter Min Max Unit

ASM1233A

Voltage on V

Voltage on RESET -0.5 VCC + 0.5 V

Operating Temperature Range -40 85 °C

Soldering Temperature (for 10 sec) 260 °C

Storage Temperature -55 125 °C

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.

CC

-0.5 7 V

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

4 of 9

November 2003

ASM1233A

rev 1.0

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

Supply Voltage

Output Voltage

Output Current

Operating Current

V

Trip Point (ASM1233A-3) V

CC

Voltage High Trip Level
ASM1233A-3

Internal Pull-up Resistor

Output Capacitance

Detect to RESET Low t

V

CC

VCC Slew Rate

(V

- V

- V

LTL

HTL

)

)

HTL

VCC Slew Rate

(V

LTL

Detect to RESET High t

V

CC

V

V

I

OL

I

CC

CCTP

V

HTL

R

C

OUT

RPD

t

t

RPU

CC

OH

P

F

R

1.2 5.5 V

I

< 500 µA VCC - 0.5V VCC - 0.1V

OUT

Output = 0.4V, VCC >= 2.7V

VCC < =3.6V, RESET output

open

tr = 5µs

+8 mA

2.64 2.72 2.8 V

3.5 5.0 7.5 kΩ

300 µs

0ns

200 350 500 ms

V

615µA

3.14 V

10 pF

210µs

Note: A 1kΩ resistor maybe required in some applications for proper operation of the microprocessor reset control circuit.

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

5 of 9

November 2003

rev 1.0

Family Selection Guide

ASM1233A

Part # RESET Voltage (V)

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

ASM1233A 2.720 350 Open-Drain LOW

RESET Time

(ms)

Output Stage RESET Polarity

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

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rev 1.0

Package Information

ASM1233A

SOT-223

B

H

E

D

S

A1

B1

e1

Dimensions in millimeters Dimensions in Inches

Symbol

Min Max Min Max

A 0.067 0.060 1.70 1.50

A1 0.004 0.0008 0.10 0.02

B 0.124 0.116 3.15 2.95

B1 0.033 0.026 0.85 0.65

C 0.014 0.010 0.35 0.25

D 0.264 0.248 6.70 6.30

e 0.0905 NOM 2.30 NOM

e

A

Q

Q1

Q2

C

e1 0.181 NOM 4.50 NOM

E 0.146 0.130 3.70 3.30

h 0.287 0.264 7.30 6.70

s 0.041 0.033 1.05 0.85

Q 10 ° MAX 10 ° MAX

Q1 16° 10° 16° 10°

Q2 16° 10° 16° 10°

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

7 of 9

November 2003

rev 1.0

Ordering Information

ASM1233A

Part Number RESET Output Voltage RESET Tolerance RESET Time

ASM1233AZ-15 2.720 V 15% 350 ms  LOW

Open-Drain

Output Stage*

RESET Polarity

* Internal 5kΩ resistor pull-up

Low Power, 3.3V, µP Reset, Active LOW, Open-Drain Output

Notice: The information in this document is subject to change without notice

8 of 9

ASM1233A

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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Preliminary Information
Part Number: ASM1233A
Document Version: 1.0