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SN74CB3T3245PWG4 Fiches technique(PDF) 8 Page - Texas Instruments |
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SN74CB3T3245PWG4 Fiches technique(HTML) 8 Page - Texas Instruments |
8 / 28 page OE A1 A8 B1 B8 2 9 19 18 11 SW SW 0 V |VCC VCC OUT IN CB3T Output Voltages Input Voltages 0 V |VCC = 1 V VCC + 1 V 5.5 V SN74CB3T3245 SCDS136B – OCTOBER 2003 – REVISED JUNE 2015 www.ti.com 8 Detailed Description 8.1 Overview The SN74CB3T3245 device is a high-speed TTL-compatible FET bus switch with low ON-state resistance (ron), allowing for minimal propagation delay. The device fully supports mixed-mode signal operation on all data I/O ports by providing voltage translation that tracks VCC. The SN74CB3T3245 device supports systems using 5-V TTL, 3.3-V LVTTL, and 2.5-V CMOS switching standards, as well as user-defined switching levels (see Figure 5). The SN74CB3T3245 device is an 8-bit bus switch with a single ouput-enable (OE) input and a standard '245 pinout. When OE is low, the 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 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 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. 8.2 Functional Block Diagram If the input high voltage (VIH) level is greater than or equal to VCC + 1V, and less than or equal to 5.5V, the output high voltage (VOH) level will be equal to approximately the VCC voltage level. Figure 5. Typical DC Voltage Translation Characteristics Figure 6. Logic Diagram (Positive Logic) 8 Submit Documentation Feedback Copyright © 2003–2015, Texas Instruments Incorporated Product Folder Links: SN74CB3T3245 |
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