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Fairchild Semiconductor Electronic Components Datasheet

74F645 Datasheet

Octal Bus Transceiver with 3-STATE Outputs

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July 1989
Revised August 1999
74F640 • 74F645
Octal Bus Transceiver with 3-STATE Outputs
General Description
These devices are octal bus transceivers designed for
asynchronous two-way data flow between the A and B bus-
ses. Both busses are capable of sinking 64 mA, have 3-
STATE outputs, and a common output enable pin. The
direction of data flow is determined by the transmit/receive
(T/R) input. The 74F645 is a high speed/low power version
of the 74F245. The 74F640 is an inverting option of the
74F645.
Features
s Designed for asynchronous two-way data flow between
busses
s Outputs sink 64 mA
s Transmit/receive (T/R) input controls the direction of
data flow
s 74F645 is a lower power, faster version of the 74F245
s 74F640 is an inverting option of the 74F645
Ordering Code:
Order Number Package Number
Package Description
74F640SC
M20B
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
74F640PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
74F645PC
N20A
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
Connection Diagram
© 1999 Fairchild Semiconductor Corporation DS010267
www.fairchildsemi.com


Fairchild Semiconductor Electronic Components Datasheet

74F645 Datasheet

Octal Bus Transceiver with 3-STATE Outputs

No Preview Available !

Unit Loading/Fan Out
Pin Names
OE
T/R
A0–A7
B0–B7
Description
Output Enable Input (Active LOW)
Transmit/Receive Input
Side A Inputs or
3-STATE Outputs
Side B Inputs or
3-STATE Outputs
U.L.
HIGH/LOW
1.0/1.0
1.0/1.0
3.5/0.667
600/106.6
3.5/0.667
600/106.6
Input IIH/IIL
Output IOH/IOL
20 µA/0.6 mA
20 µA/0.6 mA
70 µA/0.4 mA
12 mA/64 mA
70 µA/0.4 mA
12 mA/64 mA
Functional Description
The output enable (OE) is active LOW. If the device is dis-
abled (OE HIGH), the outputs are in the high impedance
state. The transmit/receive input (T/R) controls whether
data is transmitted from the A bus to the B bus or from the
B bus to the A bus. When T/R is LOW, B data is sent to the
A bus. If T/R is HIGH, A data is sent to the B bus.
Logic Diagram
Function Table
Inputs
Outputs
OE T/R
74F640
74F645
L L Bus B data to Bus A Bus B data to Bus A
L H Bus A data to Bus B Bus A data to Bus B
HX
H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance State
Z
Z
74F640
74F645
www.fairchildsemi.com
2


Part Number 74F645
Description Octal Bus Transceiver with 3-STATE Outputs
Maker Fairchild
PDF Download

74F645 Datasheet PDF






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