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SN74CB3T3383PWRG4 数据表(PDF) 2 Page - Texas Instruments

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部件名 SN74CB3T3383PWRG4
功能描述  10-BIT FET BUS-EXCHANGE SWITCH 2.5V/3.3-V LOW-VOLTAGE BUSSWITCH WITH 5-V-TOLERANT LEVEL SHIFTER
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制造商  TI [Texas Instruments]
网页  http://www.ti.com
标志 TI - Texas Instruments

SN74CB3T3383PWRG4 数据表(HTML) 2 Page - Texas Instruments

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SN74CB3T3383
10BIT FET BUSEXCHANGE SWITCH
2.5V/3.3V LOW VOLTAGE BUS SWITCH WITH 5V TOLERANT LEVEL SHIFTER
SCDS158A − OCTOBER 2003 − REVISED DECEMBER 2004
2
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
description/ordering information (continued)
The SN74CB3T3383 is a high-speed TTL-compatible FET bus-exchange 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 SN74CB3T3383 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, then 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 SN74CB3T3383 is organized as a 10-bit bus switch or as a 5-bit bus-exchange with enable (BE) input.
When used as a 5-bit bus-exchange, the device provides data exchanging between four signal ports. When BE
is low, the bus-exchange switch is ON, and the select input (BX) controls the data path. When BE is high, the
bus-exchange 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, BE 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.


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