SN54173J ,4-Bit D-type Registers with 3-State Outputs SN54173, SN54LS173A, SN74173, SN74LS173A 4-BIT D-TYPE REGISTERSWITH 3-STATE OUTPUTSSDLS067A – OCTO ..
SN54173J ,4-Bit D-type Registers with 3-State Outputsmaximum ratings over operating free-air temperature range (unless otherwise noted)Supply voltage, V ..
SN54174J , HEX/QUADRUPLE D-TYPE FLIP-FLOPS WITH CLEAR
SN54174J , HEX/QUADRUPLE D-TYPE FLIP-FLOPS WITH CLEAR
SN54174J , HEX/QUADRUPLE D-TYPE FLIP-FLOPS WITH CLEAR
SN54175J ,HEX/QUADRUPLE D-TYPE FLIP-FLOPS WITH CLEAR
SN74CBT3257CPWG4 ,4-Bit 1-Of-2 FET Multiplexer/Demultiplexer with -2 V Undershoot Protection 16-TSSOP -40 to 85maximum ratings over operating free-air temperature range (unless otherwise noted)Supply voltage ra ..
SN74CBT3257CPWR ,4-Bit 1-Of-2 FET Multiplexer/Demultiplexer with -2 V Undershoot Protectionlogic diagram (positive logic)4 21A SW 1B131B2SW7 52A SW 2B162B2SW9 113A SW 3B1103B2SW12 144A SW 4B ..
SN74CBT3257D ,4-Bit 1-Of-2 FET Multiplexer/Demultiplexermaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
SN74CBT3257DB , 4-BIT 1-OF-2 FET MULTIPLEXER/DEMULTIPLEXER
SN74CBT3257DBLE ,4-Bit 1-Of-2 FET Multiplexer/Demultiplexermaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
SN74CBT3257DBQR ,4-Bit 1-Of-2 FET Multiplexer/Demultiplexermaximum ratings over operating free-air temperature range (unless otherwise noted)Supply voltage ra ..
SN54173J
4-Bit D-type Registers with 3-State Outputs
Eliminates Restrictions for Operating in
One of Two Modes:
– Parallel Load
– Do Nothing (Hold) For Application as Bus Buffer Registers Package Options Include Plastic
Small-Outline (D) Packages, Ceramic Flat
(W) Packages, Ceramic Chip Carriers (FK),
and Standard Plastic (N) and Ceramic (J)
DIPs
descriptionThe ’173 and ’LS173A 4-bit registers include
D-type flip-flops featuring totem-pole 3-state
outputs capable of driving highly capacitive
or relatively low-impedance loads. The
high-impedance third state and increased
high-logic-level drive provide these flip-flops with
the capability of being connected directly to and
driving the bus lines in a bus-organized system without need for interface or pull-up components. Up to 128 of
the SN74173 or SN74LS173A outputs can be connected to a common bus and still drive two Series 54/74 or
54LS/74LS TTL normalized loads, respectively. Similarly, up to 49 of the SN54173 or SN54LS173A outputs can
be connected to a common bus and drive one additional Series 54/74 or 54LS/74LS TTL normalized load,
respectively. To minimize the possibility that two outputs will attempt to take a common bus to opposite logic
levels, the output control circuitry is designed so that the average output disable times are shorter than the
average output enable times.
Gated enable inputs are provided on these devices for controlling the entry of data into the flip-flops. When both
data-enable (G1, G2) inputs are low, data at the D inputs are loaded into their respective flip-flops on the next
positive transition of the buffered clock input. Gate output-control (M, N) inputs also are provided. When both
are low, the normal logic states (high or low levels) of the four outputs are available for driving the loads or bus
lines. The outputs are disabled independently from the level of the clock by a high logic level at either
output-control input. The outputs then present a high impedance and neither load nor drive the bus line. Detailed
operation is given in the function table.
The SN54173 and SN54LS173A are characterized for operation over the full military temperature range of
–55°C to 125°C. The SN74173 and SN74LS173A are characterized for operation from 0°C to 70°C.
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.
CLK
GND
CLR
SN54LS173A... FK PACKAGE
(TOP VIEW)MNC CLR
GND
NC – No internal connectionG1
CLK
