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CD74FCT244MG4 데이터시트(PDF) 1 Page - Texas Instruments |
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CD74FCT244MG4 데이터시트(HTML) 1 Page - Texas Instruments |
1 / 11 page CD74FCT244, CD74FCT244AT BiCMOS OCTAL BUFFERS/LINE DRIVERS WITH 3-STATE OUTPUTS SCBS722B – JULY 2000 – REVISED AUGUST 2003 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 64-mA Output Sink Current D Output Voltage Swing Limited to 3.7 V D SCR Latch-Up-Resistant BiCMOS Process and Circuit Design description/ordering information The CD74FCT244 and CD74FCT244AT are octal buffer/line drivers with 3-state outputs using a small-geometry BiCMOS technology. The output stages are a combination of bipolar and CMOS transistors that limit the output high level to two diode drops below VCC. This resultant lowering of output swing (0 V to 3.7 V) reduces the 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 64 mA. These devices are organized as two 4-bit buffers/line drivers with separate active-low output-enable (OE) inputs. When OE is low, the device passes data from the A inputs to the Y outputs. When OE is high, 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. ORDERING INFORMATION TA PACKAGE† ORDERABLE PART NUMBER TOP-SIDE MARKING 0 C to 70 C PDIP – E Tube CD74FCT244E CD74FCT244E 0 C to 70 C SOIC – M Tube CD74FCT244M 74FCT244M 0 C to 70 C SOIC – M Tape and reel CD74FCT244M96 74FCT244M 0 °C to 70°C SSOP – SM Tape and reel CD74FCT244SM96 FCT244SM PDIP – E Tube CD74FCT244ATE CD74FCT244ATE SOIC – M Tube CD74FCT244ATM 74FCT244ATM SOIC – M Tape and reel CD74FCT244ATM96 74FCT244ATM † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. FUNCTION TABLE (each buffer/driver) INPUTS OUTPUT OE A OUTPUT Y L H H L LL H X Z Copyright 2003, 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. CD74FCT244 . . . E, M, OR SM PACKAGE CD74FCT244AT...E OR M PACKAGE (TOP VIEW) 1 2 3 4 5 6 7 8 9 10 20 19 18 17 16 15 14 13 12 11 1OE 1A1 2Y4 1A2 2Y3 1A3 2Y2 1A4 2Y1 GND VCC 2OE 1Y1 2A4 1Y2 2A3 1Y3 2A2 1Y4 2A1 |
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