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HD74BC620A Datasheet(PDF) 1 Page - Hitachi Semiconductor

Part No. HD74BC620A
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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HD74BC620A Datasheet(HTML) 1 Page - Hitachi Semiconductor

   
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HD74BC620A
Octal Bus Transceivers With 3 State Outputs
ADE-205-024 (Z)
Rev. 0
June 1993
Description
The HD74BC620A 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. This device allows data transmission from the A bus to the B bus or
from the B bus to the A bus depending upon the logic levels at the enable inputs (
GBA and GAB). The
enable inputs can be used to disable the device so that the buses are effectively isolated.
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
Enable Inputs
GBA
GAB
Operation
LL
B data to A bus
HH
A data to B bus
H
L
Isolation
LH
B data to A bus
A data to B bus
H :
High level
L
:
Low level


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