ASM1834/A/D

2 of 10

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

Dual 5V and 3.3V µP Power Supply Supervisor with Manual Reset

rev 1.3

April 2005

Block Diagram

Pin Configuration

Pin Description

Pin #

Pin Name

Function

1

5V power supply input.

2

5V RESET

5V RESET

5V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A).

5V reset output (Active HIGH, AS1834D).

35V TOL

4

GND

Ground.

5

PBRST

Debounced manual pushbutton reset input (40k

Ω internal pull-up).

63.3V TOL

7

3.3V RESET

3.3V RESET

3.3V reset output (Active LOW, ASM1834, ASM1834A. Open drain outputs for ASM1834A).

3.3V reset output (Active HIGH, AS1834D).

8

3.3V power supply input.

1

2

3

4

5

6

7

8

5V RESET *

5V TOL

GND

3.3V RESET *

PBRST

3.3V TOL

ASM1834

ASM1834A

ASM1834D

* AS1834D reset outputs are active HIGH (5V RESET and 3.3V RESET)

Outputs are open-drain for AS1834A.

5V Tolerance

Bias

Low TC

3.3V Tolerance

Pushbutton Level

For ASM1834D

350ms Delay

5 VTOL

PBRST

3.3 VTOL

GND

3.3V RESET

3.3V RESET (ASM1834D)

5V RESET

5V RESET

ASM1834

350ms Delay

Reference

Bias

Sense and Debounce

For ASM1834D

-

+

-

ASM1834A

5V RESET

3.3V RESET

40k

Ω

(ASM1834D)

+

1

3

5

8

6

4

7

2

2

7