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SN74CB3T3384DWRE4 Datenblatt(PDF) 2 Page - Texas Instruments |
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SN74CB3T3384DWRE4 Datenblatt(HTML) 2 Page - Texas Instruments |
2 / 15 page SN74CB3T3384 10BIT FET BUS SWITCH 2.5V/3.3V LOW VOLTAGE BUS SWITCH WITH 5V TOLERANT LEVEL SHIFTER SCDS159B − OCTOBER 2003 − REVISED MARCH 2004 2 POST OFFICE BOX 655303 • DALLAS, TEXAS 75265 description/ordering information (continued) The SN74CB3T3384 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 SN74CB3T3384 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 1). VCC ≈VCC 5.5 V 0 V NOTE A: If the input high voltage (VIH) level is greater than or equal to VCC − 1 V, and less than or equal to 5.5 V, the output high voltage (VOH) level will be equal to approximately the VCC voltage level. Input Voltages Output Voltages 0 V ≈VCC − 1 V ≈VCC − 1 V VCC IN OUT CB3T Figure 1. Typical DC-Voltage-Translation Characteristics The SN74CB3T3384 is organized as two 5-bit bus switches with separate ouput-enable (1OE, 2OE) inputs. It can be used as two 5-bit bus switches or as one 10-bit bus switch. When OE is low, the associated 5-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 5-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. FUNCTION TABLE (each 5-bit bus switch) INPUT INPUT/OUTPUT FUNCTION INPUT OE INPUT/OUTPUT A FUNCTION L B A port = B port H Z Disconnect |
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