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HD74BC645A Datasheet(PDF) 1 Page - Hitachi Semiconductor

Part No. HD74BC645A
Description  Octal Bus Transceivers With 3 State Outputs
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Maker  HITACHI [Hitachi Semiconductor]
Homepage  http://www.renesas.com/eng
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HD74BC645A Datasheet(HTML) 1 Page - Hitachi Semiconductor

   
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HD74BC645A
Octal Bus Transceivers With 3 State Outputs
ADE-205-027 (Z)
Rev.0
June 1993
Description
The HD74BC645A provides high drivability and operation equal to or better than high speed bipolar
standard logic IC by using Bi-CMOS process. The device features low power dissipation that is about 1/5
of high speed bipolar logic IC. When the frequency is 10 MHz. The device has eight bus transceivers with
three state outputs in a 20 pin package. Each device has an active low enable input (
G) and a direction
control input, DiR. When DiR is high, data flows from the A inputs to the B outputs. When DiR is high,
data flows from the B inputs to the A outputs. When enable inputs (
G) is high, disables both A and B ports
by placing then in a high impedance.
Features
• Input/Output are at high impedance state when power supply is off.
• Input pins can be open, when not used, owing to built in input pull up circuit.
• Input is TTL level.
• Wide operating temperature range
Ta = –40 to +85°C.
Function Table
Control Inputs
G
DIR
Operation
L
L
B data to A bus
L
H
A data to B bus
HX
Z
H :
High level
L
:
Low level
X :
Immaterial
Z
:
High impedance


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