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SN74CB3T3245PWRE4 Datasheet(PDF) 8 Page - Texas Instruments

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No. de pieza SN74CB3T3245PWRE4
Descripción Electrónicos  8-Bit FET Bus Switch
Download  28 Pages
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Fabricante Electrónico  TI1 [Texas Instruments]
Página de inicio  http://www.ti.com
Logo TI1 - Texas Instruments

SN74CB3T3245PWRE4 Datasheet(HTML) 8 Page - Texas Instruments

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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
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Product Folder Links: SN74CB3T3245


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