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SN74CBT3244PWE4 Scheda tecnica(PDF) 7 Page - Texas Instruments

Il numero della parte SN74CBT3244PWE4
Spiegazioni elettronici  Octal FET Bus Switch
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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1OE
1A1
1A4
1B1
1B4
2
8
1
18
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2OE
2A1
2A4
2B1
2B4
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SN74CBT3244
www.ti.com
SCDS001O – NOVEMBER 1992 – REVISED SEPTEMBER 2015
8 Detailed Description
8.1 Overview
The SN74CBT3244 has eight bits of high-speed TTL-compatible bus switching. The switches are grouped in the
2 groups of 4 bits each. Each group has output-enabled inputs to allow signals to pass between A and B ports.
The signals can travel from A port to B port or vice versa.
The low ON-state resistance of the switch allows connections to be made with minimal propagation delay. The
device is ideal for switching high speed digital signals between microprocessors and peripheral devices which is
useful in test applications, measurement applications, and control boards for factory automation.
8.2 Functional Block Diagram
Figure 3. Simplified Schematic
8.3 Feature Description
The SN74CBT3244 device support same pin configuration as industry standard '244. This device has a near
zero propagation delay allowing high speed signal switching up to 200 Mhz. The signals see lower distortion
since the device has low ON-resistance (5
Ω) coupled with low-output capacitance (6 pF) . SN74CBT3244 has a
very low power consumption in idle state consuming ICC of 50 µA only allowing power-saving for the system. The
device supports signal inputs any where between 0 V to 5 V.
8.4 Device Functional Modes
The device is organized as two 4-bit low-impedance switches with separate output-enable (OE) inputs.The
Output Enable OE is active low, implying when low A port is connected to B port. This switch is bidirectional in
nature. Asserting OE high will disconnect A port from B port. 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.
Table 1. Function Table
(Each 4-Bit Bus Switch)
INPUT OE
FUNCTION
L
A port = B port
H
Disconnect
Copyright © 1992–2015, Texas Instruments Incorporated
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