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

ASM1834/A/D

November 2006

rev 1.5

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

3.3VTOL=GND.

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