MC74AC646_15 Datasheet, PDF(2/10 Page) ON Semiconductor – Octal Transceiver/Register with 3-State Outputs

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MC74AC646_15 Datasheet, PDF (2/10 Pages) ON Semiconductor – Octal Transceiver/Register with 3-State Outputs

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MC74AC646, MC74ACT646

VCC CBA SBA G B0 B1 B2 B3 B4 B5 B6 B7

24 23 22 21 20 19 18 17 16 15 14 13

1 2 3 4 5 6 7 8 9 10 11 12

CAB SAB DIR A0 A1 A2 A3 A4 A5 A6 A7 GND

Figure 5. Pinout: 24âLead Packages Conductors

(Top View)

PIN ASSIGNMENT

FUNCTION

A0âA7

Data Register Inputs

Data Register A Outputs

B0âB7

Data Register B Inputs

Data Register B Outputs

CAB, CBA

Clock Pulse Inputs

SAB, SBA

Transmit/Receive Inputs

DIR, G

Output Enable Inputs

CAB A0 A1 A2 A3 A4 A5 A6 A7

SAB

DIR

CBA

SBA

G B0 B1 B2 B3 B4 B5 B6 B7

Figure 6. Logic Symbol

DIR

CBA

SBA

CAB

SAB

1 OF 8 CHANNELS

TO 7 OTHER CHANNELS

NOTE: This diagram is provided only for the understanding of logic

operations and should not be used to estimate propagation delays.

Figure 7. Logic Diagram

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