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SNJ54ABT534J-SNJ54ABT534W
Octal Edge-Triggered D-type Flip-Flops With 3-State Outputs
at VCC = 5 V, TA = 25°C High-Drive Outputs (–32-mA IOH, 64-mA IOL) ESD Protection Exceeds 2000 V Per
MIL-STD-883, Method 3015; Exceeds 200 V
Using Machine Model (C = 200 pF, R = 0) Package Options Include Plastic
Small-Outline (DW), Shrink Small-Outline
(DB), and Thin Shrink Small-Outline (PW)
Packages, Ceramic Chip Carriers (FK),
Plastic (N) and Ceramic (J) DIPs, and
Ceramic Flat (W) Package
descriptionThese 8-bit flip-flops with 3-state outputs are
designed specifically for driving highly capacitive
or relatively low-impedance loads. They are
particularly suitable for implementing buffer
registers, I/O ports, bidirectional bus drivers, and
working registers.
The eight flip-flops are edge-triggered D-type
flip-flops. On the positive transition of the clock
(CLK), the Q outputs are set to the complement of
the logic levels set up at the data (D) inputs.
A buffered output-enable (OE) input can be used to place the eight outputs in either a normal logic state (high
or low logic levels) or a high-impedance state. In the high-impedance state, the outputs neither load nor drive
the bus lines significantly. The high-impedance state and increased drive provide the capability to drive bus lines
without need for interface or pullup components.
OE does not affect the internal operations of the flip-flop. Previously stored data can be retained or new data
can be entered while the outputs are in the high-impedance state.
To ensure the high-impedance state during power up or power down, OE should be tied to VCC through a pullup
resistor; the minimum value of the resistor is determined by the current-sinking capability of the driver.
The SN54ABT534 is characterized for operation over the full military temperature range of –55°C to 125°C. The
SN74ABT534A is characterized for operation from –40°C to 85°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.
GND
CLK
SN54ABT534... FK PACKAGE
(TOP VIEW)1QOE
GND
CLK
