SCAN182245ASSCX Просмотр технического описания (PDF) - Fairchild Semiconductor

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SCAN182245ASSCX

Non-Inverting Transceiver with 25Ω Series Resistor Outputs

Fairchild Semiconductor 

Truth Tables

Inputs

Inputs

G1

(Note 1)

DIR1

A1(0–8)

B1(0–8)

G2

(Note 1)

DIR2

L

L

H←H

L

L

L

L

L←L

L

L

L

H

H→H

L

H

L

H

L→L

L

H

H

X

Z

Z

H

X

H = HIGH Voltage Level

L = LOW Voltage Level

X = Immaterial

Z = High Impedance

Note 1: Inactive-to-Active transition must occur to enable outputs upon power-up.

A2(0–8)

B2(0–8)

H←H

L←L

H→H

L→L

Z

Z

Functional Description

The SCAN182245A consists of two sets of nine non-invert-

ing bidirectional buffers with 3-STATE outputs and is

intended for bus-oriented applications. Direction pins (DIR1

and DIR2) LOW enables data from B Ports to A Ports,

when HIGH enables data from A Ports to B Ports. The Out-

put Enable pins (G1 and G2) when HIGH disables both A

and B Ports by placing them in a high impedance condition.

Block Diagrams

A1, B1, G1 and DIR1

A2, B2, G2 and DIR2

Note: BSR stands for Boundary Scan Register.

Note: BSR stands for Boundary Scan Register.

Tap Controller

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