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SN74CB3Q16245DGG データシート(PDF) 2 Page - Texas Instruments |
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SN74CB3Q16245DGG データシート(HTML) 2 Page - Texas Instruments |
2 / 9 page www.ti.com DESCRIPTION/ORDERING INFORMATION SN74CB3Q16245 16-BIT SWITCH 2.5-V/3.3-V LOW-VOLTAGE FET BUS SWITCH SCDS171A – JULY 2004 – REVISED MARCH 2005 The SN74CB3Q16245 is a high-bandwidth FET bus switch utilizing a charge pump to elevate the gate voltage of the pass transistor, providing a low and flat ON-state resistance (ron). The low and flat ON-state resistance allows for minimal propagation delay and supports rail-to-rail switching on the data input/output (I/O) ports. The device also features low data I/O capacitance to minimize capacitive loading and signal distortion on the data bus. Specifically designed to support high-bandwidth applications, the SN74CB3Q16245 provides an optimized interface solution ideally suited for broadband communications, networking, and data-intensive computing systems. The SN74CB3Q16245 is organized as two 8-bit bus switches with separate output-enable (1OE, 2OE) inputs. It can be used as two 8-bit bus switches, or as one 16-bit bus switch. When OE is low, the associated 8-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 8-bit bus switch is OFF, 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 Tube SN74CB3Q16245DL SSOP – DL CB3Q16245 Tape and reel SN74CB3Q16245DLR –40 °C to 85°C Tube SN74CB3Q16245DGG TSSOP – DGG CB3Q16245 Tape and reel SN74CB3Q16245DGGR TVSOP – DGV Tape and reel SN74CB3Q16245DGVR BW245 (1) Package drawings, standard packing quantities, thermal data, symbolization, and PCB design guidelines are available at www.ti.com/sc/package. FUNCTION TABLE (EACH 8-BIT BUS SWITCH) INPUT INPUT/OUTPUT FUNCTION OE A L B A port = B port H Z Disconnect 2 |
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