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© Koninklijke Philips Electronics N.V. 2005. All rights reserved.

Product data sheet

Rev. 01 — 27 October 2005

4 of 16

Philips Semiconductors

CBT3257A

Quad 1-of-2 multiplexer/demultiplexer

6.

Functional description

Refer to Figure 1 “Logic diagram of CBT3257A (positive logic)”.

6.1 Function table

7.

Limiting values

[1]

The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings

are observed.

8.

Recommended operating conditions

Table 3:

Function selection

H = HIGH voltage level; L = LOW voltage level; X = Don’t care

Inputs

Function

OE

S

L

L

A port = B1 port

L

H

A port = B2 port

H

X

disconnect

Table 4:

Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134).

Symbol

Parameter

Conditions

Min

Max

Unit

supply voltage

−0.5

+7.0

V

input voltage

[1]

−0.5

+7.0

V

continuous current through

-

128

mA

input clamping current

-

−50

mA

storage temperature

−65

+150

°C

Table 5:

Operating conditions

operation.

Symbol

Parameter

Conditions

Min

Typ

Max

Unit

supply voltage

4.5

-

5.5

V

HIGH-state input voltage

2.0

-

-

V

LOW-state input voltage

-

-

0.8

V

ambient temperature

operating in free-air

−40

-

+85

°C