Overview
The SN74CBTLV3257, produced by Texas Instruments, is a 4-bit 1-of-2 high-speed FET multiplexer/demultiplexer. This device is designed to operate at low voltages and features a 2:1 (SPDT) configuration, allowing it to multiplex and demultiplex up to 4 channels simultaneously. It is particularly useful in applications requiring minimal propagation delay and high-speed switching.
Key Specifications
| Parameter | Value |
|---|---|
| Package Type | SSOP (16), TSSOP (16), TVSOP (16), SOIC (16), VQFN (16), UQFN (16) |
| Package Size | Varies by package (e.g., SSOP: 4.90 mm × 3.90 mm, TSSOP: 5.00 mm × 4.40 mm) |
| Switch Connection Resistance | 5 Ω |
| Switching Voltage Range | Up to 4.6 V |
| Maximum Frequency | 200 MHz |
| ESD Protection | 2000-V Human-Body Model, 200-V Machine Model |
| Partial-Power-Down Mode | Supported with Ioff feature |
| Thermal Resistance (Junction-to-Ambient) | Varies by package (e.g., SSOP: 86.7 °C/W) |
Key Features
- Rail-to-rail switching on data I/O ports
- Low on-state resistance of 5 Ω
- Ioff supports partial-power-down mode operation
- Latch-up performance exceeds 100 mA per JESD 78, Class II
- ESD protection exceeds JESD 22 – 2000-V Human-Body Model and 200-V Machine Model
- High-speed operation with minimal propagation delay
- Isolation during power off
Applications
- Internet of Things (IoT) devices
- Wireless headphones
- Television sets
- 4-bit bus multiplexing and demultiplexing
Q & A
- What is the primary function of the SN74CBTLV3257? The SN74CBTLV3257 is a 4-bit 1-of-2 high-speed FET multiplexer/demultiplexer.
- What are the available package types for the SN74CBTLV3257? The device is available in SSOP, TSSOP, TVSOP, SOIC, VQFN, and UQFN packages.
- What is the maximum switching frequency of the SN74CBTLV3257? The maximum switching frequency is 200 MHz.
- Does the SN74CBTLV3257 support partial-power-down mode? Yes, it supports partial-power-down mode with the Ioff feature.
- What is the ESD protection level of the SN74CBTLV3257? The device has ESD protection exceeding 2000-V Human-Body Model and 200-V Machine Model.
- How does the SN74CBTLV3257 handle latch-up performance? The latch-up performance exceeds 100 mA per JESD 78, Class II.
- 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 is the output-enable (OE) input used in the SN74CBTLV3257? The OE input is used to control the high-impedance state of the device; it should be tied to VCC through a pullup resistor during power up or power down.
- What is the recommended load current per channel for the SN74CBTLV3257? Load currents should not exceed ±128 mA per channel.
- Can the SN74CBTLV3257 handle voltages above its supply voltage? Yes, the inputs and outputs are overvoltage tolerant up to 4.6 V.
