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CD74FCT574M Fiches technique(PDF) 1 Page - Texas Instruments |
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CD74FCT574M Fiches technique(HTML) 1 Page - Texas Instruments |
1 / 11 page CD74FCT574 BiCMOS OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP WITH 3-STATE OUTPUTS SCBS745 – JULY 2000 1 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 D BiCMOS Technology With Low Quiescent Power D Buffered Inputs D Noninverted Outputs D Input/Output Isolation From VCC D Controlled Output Edge Rates D 48-mA Output Sink Current D Output Voltage Swing Limited to 3.7 V D SCR Latch-Up-Resistant BiCMOS Process and Circuit Design D 3-State Outputs Drive Bus Lines Directly D Package Options Include Plastic Small-Outline (M) and Shrink Small-Outline (SM) Packages and Standard Plastic (E) DIP description The CD74FCT574 is an octal, D-type, edge-triggered flip-flop that features noninverted, 3-state outputs, designed specifically for driving highly capacitive or relatively low-impedance loads. The devices are particularly suitable for implementing buffer registers, I/O ports, bidirectional bus drivers, and working registers. This device 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 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). On the positive transition of the clock (CLK) input, the Q outputs are set to the logic levels set up at the data (D) inputs. The output-enable (OE) input controls the 3-state outputs and is independent of the register operation. OE can be used to place the eight outputs in either a normal logic state (high or low logic levels) or the high-impedance state. In the high-impedance state, the outputs neither load nor drive the bus lines significantly. Old data can be retained or new data can be entered while the outputs are in the high-impedance state. The CD74FCT574 is characterized for operation from 0 °C to 70°C. FUNCTION TABLE (each flip-flop) INPUTS OUTPUT OE CLK D Q L ↑ H H L ↑ LL L H or L X Q0 H X X Z Copyright © 2000, Texas Instruments Incorporated 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. 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. 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 OE 1D 2D 3D 4D 5D 6D 7D 8D GND VCC 1Q 2Q 3Q 4Q 5Q 6Q 7Q 8Q CLK E, M, OR SM PACKAGE (TOP VIEW) |
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