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74FR2245SC Datasheet(PDF) 1 Page - Fairchild Semiconductor

No. de pieza 74FR2245SC
Descripción Electrónicos  Octal Bidirectional Transceiver with 3-STATE Outputs
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Fabricante Electrónico  FAIRCHILD [Fairchild Semiconductor]
Página de inicio  http://www.fairchildsemi.com
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74FR2245SC Datasheet(HTML) 1 Page - Fairchild Semiconductor

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© 1999 Fairchild Semiconductor Corporation
DS012114
www.fairchildsemi.com
April 1995
Revised August 1999
74FR2245
Octal Bidirectional Transceiver with 3-STATE Outputs
General Description
The 74FR2245 contains eight non-inverting bidirectional
buffers with 3-STATE outputs and is intended for bus-ori-
ented applications. Current sinking capability is 64 mA on
the A Port. The Transmit/Receive (T/R) input determines
the direction of data flow through the bidirectional trans-
ceiver. Transmit (active-HIGH) enables data from A Ports
to B Ports; Receive (active-LOW) enables data from B
Ports to A Ports. The Output Enable input, when HIGH, dis-
ables both A and B Ports by placing them in a High Z con-
dition.
Features
s Non-inverting buffers
s Bidirectional data path
s Guaranteed pin-to-pin skew
s 25
Ω series resistors in B outputs eliminate the need for
external resistors
s 3-STATE outputs drive bus lines or buffer memory
address resistors
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” letter to the ordering code.
Logic Symbol
Pin Descriptions
Connection Diagram
Truth Table
H
= HIGH Voltage Level
L
= LOW Voltage Level
X
= Immaterial
Order Number
Package Number
Package Description
74FR2245SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Pin Names
Description
OE
Output Enable Input (Active-LOW)
T/R
Transmit/Receive Input
A0–A7
Side A Inputs or 3-STATE Outputs
B0–B7
Side B Inputs or 3-STATE Outputs
Inputs
Output
OE
T/R
L
L
Bus B Data to Bus A
L
H
Bus A Data to Bus B
H
X
High Z State


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