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1. Describe
The SN74CBT3251 is a 1-of-8 high-speed TTL Compatible FET multiplexers and demultiplexers. this The low on-resistance of the switch allows Connect with minimal propagation delay. When the output enable (OE) is low, the SN74CBT3251 Enabled, and S0, S1, and S2 choose one of B A output of input data.
2. Feature
1. 5Ω switch connection between two ports
2. TTL compatible input levels
3. Low crosstalk between switches
4. Fast switching and propagation speed
5. Operating temperature range: –40°C to 85°C
3. Pin configuration
4. Application
1. Digital radio
2. Signal gating
3. Factory automation
4. television
5. Appliances
6. Programmable logic circuits
7. Sensors
5. Pin Description
6. Function description
SN74CBT3251 1-of-8 FET multiplexer and demultiplexer accepts various analog signal levels From 0 V to 5 V. It has low Ron resistance, typically 5-Ω for VCC = 5 V, allowing very little signal loss to pass through switch. On-chip binary address decoding makes channel selection easy.
7. Typical application
One application of the SN74CBT3251 device is in conjunction with a microcontroller to poll the keyboard. The microcontroller uses the channel select pins to cycle through the different channels while reading the input to see if the user has pressed any keys. This is a very powerful setup, allowing simultaneous keystrokes with very low power consumption. It also uses a few pins on microcontrollers. The downside of polling is that the microcontroller has to scan for key news frequently.
