Overview
The SN74CBT3253C is a high-speed TTL-compatible FET multiplexer/demultiplexer designed by Texas Instruments. This device is characterized by its low ON-state resistance (ron), which allows for minimal propagation delay. It features active undershoot-protection circuitry on the A and B ports, protecting against undershoot up to -2 V. The SN74CBT3253C is organized as two 1-of-4 multiplexer/demultiplexers with separate output-enable inputs, enabling bidirectional data flow between ports when the output-enable is low, and a high-impedance state when the output-enable is high.
Key Specifications
| Parameter | Value |
|---|---|
| Package | SOIC (D) - 16 pins |
| Operating Temperature Range | -40°C to 85°C |
| ON-State Resistance (ron) | 3 Ω (Typical) |
| Input/Output Capacitance (Cio(OFF)) | 5.5 pF (Typical) |
| Power Consumption (ICC) | 3 µA (Max) |
| VCC Operating Range | 4 V to 5.5 V |
| Data I/O Signaling Levels | 0 to 5 V (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V) |
| Control Input Compatibility | TTL or 5-V/3.3-V CMOS Outputs |
| ESD Performance | 2000-V Human-Body Model (A114-B, Class II), 1000-V Charged-Device Model (C101) |
Key Features
- Functionally identical to industry-standard 3253 function
- Undershoot protection for off-isolation on A and B ports up to -2 V
- Bidirectional data flow with near-zero propagation delay
- Low ON-state resistance (ron) characteristics
- Low input/output capacitance minimizes loading and signal distortion
- Data and control inputs provide undershoot clamp diodes
- Low power consumption
- VCC operating range from 4 V to 5.5 V
- Data I/Os support 0 to 5-V signaling levels
- Control inputs can be driven by TTL or 5-V/3.3-V CMOS outputs
- Ioff supports partial-power-down mode operation
- Latch-up performance exceeds 100 mA per JESD 78, Class II
- Supports I2C bus expansion and both digital and analog applications
Applications
The SN74CBT3253C is versatile and supports a variety of applications, including:
- USB interface
- Bus isolation
- Low-distortion signal gating
- I2C bus expansion
- Digital and analog signal switching
Q & A
- What is the primary function of the SN74CBT3253C?
The SN74CBT3253C is a high-speed TTL-compatible FET multiplexer/demultiplexer.
- What is the operating temperature range of the SN74CBT3253C?
The operating temperature range is -40°C to 85°C.
- What is the typical ON-state resistance (ron) of the SN74CBT3253C?
The typical ON-state resistance is 3 Ω.
- Does the SN74CBT3253C support partial-power-down mode operation?
- What are the supported signaling levels for the data I/Os?
The data I/Os support 0 to 5-V signaling levels (0.8 V, 1.2 V, 1.5 V, 1.8 V, 2.5 V, 3.3 V, 5 V).
- Can the control inputs be driven by CMOS outputs?
- What is the ESD performance of the SN74CBT3253C?
The ESD performance is tested per JESD 22, with 2000-V Human-Body Model (A114-B, Class II) and 1000-V Charged-Device Model (C101).
- Does the SN74CBT3253C support I2C bus expansion?
- What types of applications does the SN74CBT3253C support?
- How should the output-enable (OE) be configured during power up or power down?
The OE should be tied to VCC through a pullup resistor to ensure the high-impedance state.
