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74FR2245SC Datasheet

  • 74FR2245SC

  • Octal Bidirectional Transceiver with 3-STATE Outputs

  • 5頁

  • FAIRCHILD

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74FR2245 Octal Bidirectional Transceiver with 3-STATE Outputs
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鈩?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:
Order Number
74FR2245SC
Package Number
M20B
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter 鈥淴鈥?letter to the ordering code.
Logic Symbol
Connection Diagram
Pin Descriptions
Pin Names
OE
T/R
A
0
鈥揂
7
B
0
鈥揃
7
Description
Output Enable Input (Active-LOW)
Transmit/Receive Input
Side A Inputs or 3-STATE Outputs
Side B Inputs or 3-STATE Outputs
Truth Table
Inputs
OE
L
L
H
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial
Output
T/R
L
H
X
Bus B Data to Bus A
Bus A Data to Bus B
High Z State
漏 1999 Fairchild Semiconductor Corporation
DS012114
www.fairchildsemi.com

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