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74CBT16244CDGVRG4 数据表(PDF) 2 Page - Texas Instruments |
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74CBT16244CDGVRG4 数据表(HTML) 2 Page - Texas Instruments |
2 / 13 page SN74CBT16244C 16BIT FET BUS SWITCH 5V BUS SWITCH WITH 2V UNDERSHOOT PROTECTION SCDS134A − SEPTEMBER 2003 − REVISED OCTOBER 2003 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The SN74CBT16244C is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing for minimal propagation delay. Active Undershoot-Protection Circuitry on the A and B ports of the SN74CBT16244C 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 SN74CBT16244C is organized as four 4-bit bus switches with separate output-enable (1OE, 2OE, 3OE, 4OE) inputs. It can be used as four 4-bit bus switches, two 8-bit bus switches, or as one 16-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 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 (each 4-bit bus switch) INPUT INPUT/OUTPUT FUNCTION INPUT OE INPUT/OUTPUT A FUNCTION L B A port = B port H Z Disconnect logic diagram (positive logic) 1A1 SW 1B1 1A4 1OE SW 1B4 3A1 SW 3B1 3A4 3OE SW 3B4 47 43 1 36 32 25 2 6 13 17 2A1 SW 2B1 2A4 2OE SW 2B4 4A1 SW 4B1 4A4 4OE SW 4B4 41 37 48 30 26 24 8 12 19 23 |
类似零件编号 - 74CBT16244CDGVRG4 |
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类似说明 - 74CBT16244CDGVRG4 |
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