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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

rev 1.3

April 2005

Trip Point Tolerance Selection

The 3.3VTOL and 5VTOL inputs allow independent selection of

the reset trip points. If 5VTOL is connected to the 5V supply

input, a 10% tolerance is selected. If 5VTOL is grounded, a 5%

tolerance is selected.

If 3.3VTOL is connected to the 3.3V supply input, a 20%

tolerance is selected. If 3.3VTOL is grounded, a 10% tolerance

is selected. (Refer table below). The 3.3VTOL and 5VTOL

tolerance select inputs should be tied to the ground or to the

Tolerance Select

3.3V Input

5V Input

3.3V

Tolerance

TRIP Point (V)

5V

Tolerance

TRIP Point (V)

MIN

NOM

MAX

MIN

NOM

MAX

-

-

-

-

10%

4.25

4.38

4.49

5VTOL = GND

-

-

-

-

5%

4.5

4.63

4.75

20%

2.47

2.55

2.64

-

-

-

-

3.3VTOL = GND

10%

2.80

2.88

2.97

-

-

-

-

1

2

3

4

5

6

7

8

5VRESET 3.3VRESET

5V or 3.3V

5V TOL

GND

3.3V TOL

PBRST

3.3V

ASM1834A

5V

10k

Ω

Figure 7: ASM1834A Wired “OR” Connection