CD74FCT623 Datasheet, PDF (1/11 Pages) Texas Instruments – BiCMOS OCTAL BUS TRANSCEIVER WITH 3-STATE OUTPUTS

D BiCMOS Technology With Low Quiescent
Power
D Buffered Inputs
D Noninverted Outputs
D Input/Output Isolation From V_CC
D Controlled Output Edge Rates
D 64-mA Output Sink Current
D Output Voltage Swing Limited to 3.7 V
D SCR Latch-Up-Resistant BiCMOS Process
and Circuit Design
D Package Options Include Plastic
Small-Outline (M) and Shrink Small-Outline
(SM) Packages and Standard Plastic (E) DIP
CD74FCT623
BiCMOS OCTAL BUS TRANSCEIVER
WITH 3-STATE OUTPUTS
SCBS736 – JULY 2000
E, M, OR SM PACKAGE
(TOP VIEW)
OEAB ₁
A1 ₂
A2 3
A3 4
A4 5
A5 6
A6 7
A7 8
A8 9
GND 10
20 ^V_CC
19 ^OEBA
18 B1
17 B2
16 B3
15 B4
14 B5
13 B6
12 B7
11 B8
description
The CD74FCT623 is an octal bus transceiver that uses a small-geometry BiCMOS technology. The output stage
is a combination of bipolar and CMOS transistors that limits the output high level to two diode drops below V_CC.
This resultant lowering of output swing (0 V to 3.7 V) reduces power-bus ringing [a source of electromagnetic
interference (EMI)] and minimizes V_CC bounce and ground bounce and their effects during simultaneous output
switching. The output configuration also enhances switching speed and is capable of sinking 64 mA.
This device is a noninverting, 3-state, bidirectional transceiver-buffer intended for two-way transmission from
A bus to B bus or B bus to A bus, depending on the logic levels of the output-enable (OEAB, OEBA) inputs.
The dual output-enable provision gives these devices the capability to store data by simultaneously enabling
OEAB and OEBA. Each output reinforces its input under these conditions, and when all other data sources to
the bus lines are at high impedance, both sets of bus lines remain in their last states.
The CD74FCT623 is characterized for operation from 0°C to 70°C.
FUNCTION TABLE
INPUTS
OEBA OEAB
OPERATION
L
L
B data to A bus
H
H
A data to B bus
H
L
Isolation†
L
H
B data to A bus,
A data to B bus
† _{To prevent excess current in the}
high-impedance (isolation) state, all I/O
terminals should be terminated with
10-kΩ to 1-MΩ resistors.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
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Copyright © 2000, Texas Instruments Incorporated
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