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SN74CBT3257CDR 数据表(PDF) 2 Page - Texas Instruments |
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SN74CBT3257CDR 数据表(HTML) 2 Page - Texas Instruments |
2 / 15 page SN74CBT3257C 4BIT 1OF2 FET MULTIPLEXER/DEMULTIPLEXER 5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION SCDS137 − OCTOBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The SN74CBT3257C is a high-speed TTL-compatible FET multiplexer/demultiplexer with low ON-state resistance (ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT3257C provides protection for undershoot up to −2 V by sensing an undershoot event and ensuring that the switch remains in the proper OFF state. The SN74CBT3257C is a 4-bit 1-of-2 multiplexer/demultiplexer with a single output-enable (OE) input. The select (S) input controls 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 feature ensures that damaging current will not 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. FUNCTION TABLE INPUTS INPUT/OUTPUT FUNCTION OE S1 INPUT/OUTPUT A FUNCTION L L B1 A port = B1 port L HB2 A port = B2 port H X Z Disconnect |
类似零件编号 - SN74CBT3257CDR |
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类似说明 - SN74CBT3257CDR |
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