Overview
The SN74CBTLV3257RSVR, produced by Texas Instruments, is a 4-bit 1-of-2 high-speed FET multiplexer/demultiplexer. This device is designed to handle low-voltage applications with a operating voltage range of 2.3 to 3.6 V. It features low on-state resistance, allowing for minimal propagation delay and efficient signal switching. The device is controlled by a select (S) input and an output-enable (OE) input, which disables the multiplexers/demultiplexers when set high. It is fully specified for partial-power-down applications, ensuring isolation during power off and preventing backflow currents through the device.
Key Specifications
| Parameter | Test Conditions | Min | Typ | Max | Unit |
|---|---|---|---|---|---|
| VCC (Supply Voltage) | - | -0.5 | - | 4.6 | V |
| VI (Input Voltage) | - | -0.5 | - | 4.6 | V |
| Continuous Channel Current | - | - | - | 128 | mA |
| IIK (Input Clamp Current) | VI/O < 0 | -50 | - | - | mA |
| TJ (Junction Temperature) | - | - | - | 150 | °C |
| TA (Operating Free-Air Temperature) | - | -40 | - | 85 | °C |
| ron (On-State Resistance) | VCC = 2.3 V, II = 64 mA | 5 | 8 | 8 | Ω |
| Ioff (Off-State Current) | VCC = 0, VI or VO = 0 to 3.6 V | - | - | 15 | μA |
| ICC (Supply Current) | VCC = 3.6 V, IO = 0, VI = VCC or GND | - | - | 10 | μA |
Key Features
- 5-Ω switch connection between two ports, minimizing signal loss across the switch.
- Rail-to-rail switching on data I/O ports, allowing for full voltage swing outputs.
- Ioff supports partial-power-down mode operation, ensuring no damaging current backflow when the device is powered down.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 – 2000-V Human-Body Model (A114-A) and 200-V Machine Model (A115-A).
Applications
- Internet of Things (IoT) devices.
- Wireless headphones and other audio equipment.
- Television sets and other consumer electronics.
- 4-bit bus multiplexing and demultiplexing in various digital systems.
Q & A
- What is the primary function of the SN74CBTLV3257?
The SN74CBTLV3257 is a 4-bit 1-of-2 high-speed FET multiplexer/demultiplexer, used for switching and routing digital signals.
- What is the operating voltage range of the SN74CBTLV3257?
The operating voltage range is 2.3 to 3.6 V.
- How does the select (S) input control the device?
The select (S) input controls the data flow by selecting which output port (B1 or B2) is active.
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input disables the multiplexers/demultiplexers when set high.
- What is the significance of the Ioff feature?
The Ioff feature ensures that no damaging current backflows through the device when it is powered down, supporting partial-power-down mode operation.
- What are the ESD protection ratings for this device?
The device has ESD protection exceeding JESD 22 – 2000-V Human-Body Model (A114-A) and 200-V Machine Model (A115-A).
- What are some common applications of the SN74CBTLV3257?
Common applications include IoT devices, wireless headphones, television sets, and 4-bit bus multiplexing and demultiplexing.
- How does the device handle thermal management?
The device has various thermal metrics such as junction-to-ambient thermal resistance (RθJA), junction-to-case thermal resistance (RθJC), and junction-to-board thermal resistance (RθJB), which are detailed in the datasheet.
- What is the maximum continuous channel current for the SN74CBTLV3257?
The maximum continuous channel current is 128 mA.
- How should the OE pin be configured during power up or power down?
The OE pin should be tied to VCC through a pullup resistor to ensure a high-impedance state during power up or power down.
