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SN74CB3Q3251PW Datasheet(PDF) 2 Page - Texas Instruments |
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SN74CB3Q3251PW Datasheet(HTML) 2 Page - Texas Instruments |
2 / 19 page www.ti.com DESCRIPTION/ORDERING INFORMATION (CONTINUED) SN74CB3Q3251 1-OF-8 FET MULTIPLEXER/DEMULTIPLEXER 2.5-V/3.3-V LOW-VOLTAGE HIGH-BANDWIDTH BUS SWITCH SCDS173A – AUGUST 2004 – REVISED MARCH 2005 The SN74CB3Q3251 is a 1-of-8 multiplexer/demultiplexer with a single output-enable (OE) input. The select (S0, S1, S2) inputs control the data path of the multiplexer/demultiplexer. When OE is low, the 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 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 SN74CB3Q3251RGYR BU251 SSOP (QSOP) – DBQ Tape and reel SN74CB3Q3251DBQR BU251 –40°C to 85°C Tube SN74CB3Q3251PW TSSOP – PW BU251 Tape and reel SN74CB3Q3251PWR TVSOP – DGV Tape and reel SN74CB3Q3251DGVR BU251 (1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. FUNCTION TABLE INPUTS INPUT/OUTPUT FUNCTION A OE S2 S1 S0 L L L L B1 A port = B1 port L L L H B2 A port = B2 port L L H L B3 A port = B3 port L L H H B4 A port = B4 port L H L L B5 A port = B5 port L H L H B6 A port = B6 port L H H L B7 A port = B7 port L H H H B8 A port = B8 port H X X X Z Disconnect 2 |
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