Overview
The SN74CBT3257RGYR 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 high-speed applications. The multiplexer/demultiplexer is controlled by select (S) and output-enable (OE) inputs, which determine the data flow between the A-input and B1 or B2 output ports. The device is also fully specified for partial-power-down applications, ensuring isolation during power-off and preventing backflow of damaging current through the device when powered down.
Key Specifications
| Parameter | Min | Max | Unit |
|---|---|---|---|
| Supply Voltage Range (VCC) | -0.5 | 7 | V |
| Input Voltage Range (VI) | -0.5 | 7 | V |
| Continuous Channel Current | 128 | mA | |
| Operating Free-Air Temperature Range (TA) | -40 | 85 | °C |
| Propagation Delay (tpd) A or B to B or A | 0.25 | 0.35 | ns |
| Propagation Delay (tpd) S to A | 1.6 | 5.5 | ns |
| Enable Time (ten) OE to A or B | 1.8 | 5.6 | ns |
| Disable Time (tdis) OE to A or B | 1 | 5.2 | ns |
Key Features
- Low on-state resistance, allowing for minimal propagation delay.
- TTL-compatible inputs and outputs.
- Output-enable (OE) and select-control (S) inputs for data flow control.
- Partial-power-down mode with Ioff feature to prevent backflow of damaging current.
- Isolation during power-off.
- ESD protection exceeds JESD 22 standards (2000-V Human-Body Model and 200-V Machine Model).
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
Applications
The SN74CBT3257RGYR is ideal for various high-speed digital applications, including:
- Telecommunication systems.
- Data communication networks.
- Computer peripherals and interfaces.
- Industrial control systems.
- Low-power portable equipment.
Q & A
- What is the primary function of the SN74CBT3257RGYR?
The SN74CBT3257RGYR is a 4-bit 1-of-2 high-speed FET multiplexer/demultiplexer, allowing for the selection and routing of data between input and output ports.
- What are the key control inputs for this device?
The key control inputs are the select (S) input and the output-enable (OE) input.
- What is the significance of the Ioff feature?
The Ioff feature ensures that damaging current does not backflow through the device when it is powered down, providing isolation during power-off.
- What are the operating temperature ranges for this device?
The operating temperature range is from -40°C to 85°C.
- What is the maximum continuous channel current?
The maximum continuous channel current is 128 mA.
- What type of ESD protection does this device have?
The device has ESD protection that exceeds JESD 22 standards, including 2000-V Human-Body Model and 200-V Machine Model.
- How does the device handle latch-up performance?
The device's latch-up performance exceeds 100 mA per JESD 78, Class II.
- What are the typical propagation delays for this device?
The propagation delays range from 0.25 ns to 5.5 ns depending on the specific input and output paths.
- What are some common applications for this device?
Common applications include telecommunication systems, data communication networks, computer peripherals, industrial control systems, and low-power portable equipment.
- What package options are available for the SN74CBT3257?
The device is available in various packages including QFN, SOIC, SSOP, and TSSOP, with options for tube and tape-and-reel packaging.
