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74CB3Q3253DBQRG4 Datasheet(PDF) 2 Page - Texas Instruments |
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74CB3Q3253DBQRG4 Datasheet(HTML) 2 Page - Texas Instruments |
2 / 20 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) SN74CB3Q3253 DUAL 1-OF-4 FET MULTIPLEXER/DEMULTIPLEXER 2.5-V/3.3-V LOW-VOLTAGE HIGH-BANDWIDTH BUS SWITCH SCDS145A – OCTOBER 2003 – REVISED MARCH 2005 The SN74CB3Q3253 is organized as two 1-of-4 multiplexers/demultiplexers with separate output-enable(1OE, 2OE) inputs. The select (S0, S1) inputs control the data path of each multiplexer/demultiplexer. When OE is low, the associated multiplexer/demultiplexer is enabled, and the A port is connected to the B port, allowing bidirectional data flow between ports. When OE is high, the associated multiplexer/demultiplexer is disabled, and a 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(1) ORDERABLE PART NUMBER TOP-SIDE MARKING QFN – RGY Tape and reel SN74CB3Q3253RGYR BU253 SSOP (QSOP) – DBQ Tape and reel SN74CB3Q3253DBQR BU253 –40 °C to 85°C Tube SN74CB3Q3253PW TSSOP – PW BU253 Tape and reel SN74CB3Q3253PWR TVSOP – DGV Tape and reel SN74CB3Q3253DGVR BU253 (1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. FUNCTION TABLE (EACH MULTIPLEXER/DEMULTIPLEXER) INPUTS INPUT/OUTPUT FUNCTION OE S1 S0 A L L L B1 A port = B1 port L L H B2 A port = B2 port L H L B3 A port = B3 port L H H B4 A port = B4 port H X X Z Disconnect 2 |
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