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SN74CB3Q3244DWR Datasheet(PDF) 2 Page - Texas Instruments |
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SN74CB3Q3244DWR Datasheet(HTML) 2 Page - Texas Instruments |
2 / 17 page SN74CB3Q3244 8BIT FET BUS SWITCH 2.5V/3.3V LOW VOLTAGE HIGHBANDWIDTH BUS SWITCH SCDS154B − OCTOBER 2003 − REVISED DECEMBER 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The SN74CB3Q3244 is organized as two 4-bit bus switches with separate output-enable (1OE, 2OE) inputs. It can be used as two 4-bit bus switches or as one 8-bit bus switch. When OE is low, the associated 4-bit bus switch is ON, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated 4-bit bus switch is OFF, and the high-impedance state exists between the A and B ports. This device is fully specified for partial-power-down applications using Ioff. The Ioff circuitry prevents damaging current backflow through the device when it is powered down. The device has isolation during power off. 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 QFN − RGY Tape and reel SN74CB3Q3244RGYR BU244 SOIC − DW Tube SN74CB3Q3244DW CB3Q3244 SOIC − DW Tape and reel SN74CB3Q3244DWR CB3Q3244 SSOP − DB Tape and reel SN74CB3Q3244DBR BU244 −40 °C to 85°C SSOP (QSOP) − DBQ Tape and reel SN74CB3Q3244DBQR CB3Q3244 −40 C to 85 C TSSOP − PW Tube SN74CB3Q3244PW BU244 TSSOP − PW Tape and reel SN74CB3Q3244PWR BU244 TVSOP − DGV Tape and reel SN74CB3Q3244DGVR BU244 VFBGA − GQN Tape and reel SN74CB3Q3244GQNR BU244 † Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. terminal assignments 1234 A 1A1 1OE VCC 2OE B 1A2 2A4 2B4 1B1 C 1A3 2B3 2A3 1B2 D 1A4 2A2 2B2 1B3 E GND 2B1 2A1 1B4 FUNCTION TABLE (each 4-bit bus switch) INPUT INPUT/OUTPUT FUNCTION INPUT OE INPUT/OUTPUT A FUNCTION L B A port = B port H Z Disconnect GQN PACKAGE (TOP VIEW) 1 234 A B C D E |
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