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SN74CB3Q32245 Scheda tecnica(PDF) 2 Page - Texas Instruments |
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SN74CB3Q32245 Scheda tecnica(HTML) 2 Page - Texas Instruments |
2 / 10 page SN74CB3Q32245 32BIT BUS SWITCH 2.5V/3.3V HIGH BANDWIDTH SCES622 – JANUARY 2005 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) 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. FUNCTION TABLE (each 8-bit bus switch) INPUT INPUT/OUTPUT FUNCTION INPUT OE INPUT/OUTPUT A FUNCTION L B A port = B port H Z Disconnect terminal assignments 123456 A 1B2 1B1 NC 1OE 1A1 1A2 B 1B4 1B3 GND GND 1A3 1A4 C 1B6 1B5 VCC VCC 1A5 1A6 D 1B8 1B7 GND GND 1A7 1A8 E 2B2 2B1 GND GND 2A1 2A2 F 2B4 2B3 VCC VCC 2A3 2A4 G 2B6 2B5 GND GND 2A5 2A6 H 2B7 2B8 NC 2OE 2A8 2A7 J 3B2 3B1 NC 3OE 3A1 3A2 K 3B4 3B3 GND GND 3A3 3A4 L 3B6 3B5 VCC VCC 3A5 3A6 M 3B8 3B7 GND GND 3A7 3A8 N 4B2 4B1 GND GND 4A1 4A2 P 4B4 4B3 VCC VCC 4A3 4A4 R 4B6 4B5 GND GND 4A5 4A6 T 4B7 4B8 NC 4OE 4A8 4A7 NC − No internal connection GKE PACKAGE (TOP VIEW) 1 23456 A B C D E F G H J K L M N P R T |
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