CD74FCT374E ,BiCMOS FCT Interface Logic Octal D-Type Flip-Flops with 3-State Outputsmaximum ratings over operating free-air temperature range (unless otherwise noted)DC supply voltage ..
CD74FCT374E ,BiCMOS FCT Interface Logic Octal D-Type Flip-Flops with 3-State Outputsmaximum ratings” may cause permanent damage to the device. These are stress ratings only, andfuncti ..
CD74FCT374M ,BiCMOS FCT Interface Logic Octal D-Type Flip-Flops with 3-State Outputsfeatures 3-state outputs designed specifically for driving highly capacitive or relatively low-impe ..
CD74FCT374SM , BiCMOS FCT Interface Logic, Octal D-Type Flip-Flop, Three-State
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CD74FCT374E-CD74FCT374M
BiCMOS FCT Interface Logic Octal D-Type Flip-Flops with 3-State Outputs
Noninverted Outputs Input/Output Isolation From VCC Controlled Output Edge Rates 48-mA Output Sink Current Output Voltage Swing Limited to 3.7 V SCR Latch-Up-Resistant BiCMOS Processand Circuit Design Package Options Include Plastic
Small-Outline (M) and Shrink Small-Outline
(SM) Packages and Standard Plastic (E) DIP
descriptionThe CD74FCT374 is an octal, edge-triggered, D-type flip-flop that uses a small-geometry BiCMOS technology
and features 3-state outputs designed specifically for driving highly capacitive or relatively low-impedance
loads. This device is particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers,
and working registers.
The output stage is a combination of bipolar and CMOS transistors that limits the output high level to two diode
drops below VCC . This resultant lowering of output swing (0 V to 3.7 V) reduces power-bus ringing [a source
of electromagnetic interference (EMI)] and minimizes VCC bounce and ground bounce and their effects during
simultaneous output switching. The output configuration also enhances switching speed and is capable of
sinking 48 mA.
The eight flip-flops enter data into their registers on the low-to-high transition of the clock (CLK). The
output-enable (OE) input controls the 3-state outputs and is independent of the register operation. When OE
is high, the outputs are in the high-impedance state.
A buffered OE input can be used to place the eight outputs in either a normal logic state (high or low) or the
high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly.
The high-impedance state and the increased drive provide the capability to drive bus lines without interface or
pullup components.
OE does not affect internal operations of the flip-flop. Old 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 CD74FCT374 is 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.
GND
CLK
