Overview
The SN74CBT3257DR is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer produced by Texas Instruments. This device is designed to provide minimal propagation delay due to its low on-state resistance, making it suitable for applications requiring high-speed data switching. The multiplexer/demultiplexer features an output-enable (OE) input and a select-control (S) input, which allow for the selection of the appropriate B1 and B2 outputs for the A-input data.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range (VCC) | −0.5 V to 7 V | V |
| Input Voltage Range (VI) | −0.5 V to 7 V | V |
| Continuous Channel Current | 128 mA | mA |
| Propagation Delay (tpd) from A or B to B or A | 0.35 ns (VCC = 4 V), 0.25 ns (VCC = 5 V) | ns |
| Propagation Delay (tpd) from S to A | 5.5 ns (VCC = 4 V), 1.6 ns (VCC = 5 V) | ns |
| Output Enable Time (ten) from OE to A or B | 5.6 ns (VCC = 4 V), 1.8 ns (VCC = 5 V) | ns |
| Output Disable Time (tdis) from OE to A or B | 5.2 ns (VCC = 4 V), 1 ns (VCC = 5 V) | ns |
| Operating Temperature Range | −40°C to 85°C | °C |
| Package Type | 16-SOIC (0.154", 3.90mm Width) |
Key Features
- High-speed TTL-compatible FET multiplexer/demultiplexer with low on-state resistance.
- Minimal propagation delay due to low on-state resistance.
- Output-enable (OE) and select-control (S) inputs for data path selection.
- Supports bidirectional data flow between ports when OE is low.
- High-impedance state between A and B ports when OE is high.
- Operating voltage range from −0.5 V to 7 V.
- Continuous channel current up to 128 mA.
Applications
The SN74CBT3257DR is suitable for various high-speed data switching applications, including:
- High-speed data transmission systems.
- Telecommunication equipment.
- Networking devices.
- Embedded systems requiring fast data multiplexing/demultiplexing.
- Industrial control systems.
Q & A
- What is the primary function of the SN74CBT3257DR?
The SN74CBT3257DR is a 4-bit 1-of-2 high-speed TTL-compatible FET multiplexer/demultiplexer. - What is the operating temperature range of the SN74CBT3257DR?
The operating temperature range is −40°C to 85°C. - What is the maximum continuous channel current for the SN74CBT3257DR?
The maximum continuous channel current is 128 mA. - How does the output-enable (OE) input affect the device?
When OE is low, the multiplexer/demultiplexer is enabled, and when OE is high, the device is in a high-impedance state. - What is the propagation delay of the SN74CBT3257DR?
The propagation delay from A or B to B or A is 0.35 ns (VCC = 4 V) and 0.25 ns (VCC = 5 V). - What package types are available for the SN74CBT3257DR?
The device is available in 16-SOIC (0.154", 3.90mm Width) packages. - Is the SN74CBT3257DR still in production?
No, the SN74CBT3257DR is obsolete and new designs should consider an alternate product. - What are the input voltage range and supply voltage range for the SN74CBT3257DR?
Both the input voltage range and supply voltage range are −0.5 V to 7 V. - What is the purpose of the select-control (S) input?
The select-control (S) input controls the data path of the multiplexer/demultiplexer. - Can the SN74CBT3257DR handle bidirectional data flow?
Yes, the device supports bidirectional data flow between ports when OE is low.
