Professional IC Distribution & Technical Solutions

The TC74LCX16244AFT is a 16-bit buffer/driver manufactured by Toshiba. Below are its key specifications, descriptions, and features:

Specifications:

• Logic Family: LCX (Low Voltage CMOS)
• Number of Bits: 16 (2 x 8-bit buffers)
• Supply Voltage Range (VCC): 2.0V to 3.6V
• Input Voltage Range (VI): 0V to 5.5V (5V tolerant inputs)
• Output Voltage Range (VO): 0V to VCC
• High-Level Output Current (IOH): -24mA
• Low-Level Output Current (IOL): 24mA
• Propagation Delay (tpd): 4.5ns (max) @ 3.3V, 25°C
• Operating Temperature Range: -40°C to +85°C
• Package Type: TSSOP-48

Descriptions:

• The TC74LCX16244AFT is a non-inverting 16-bit buffer/driver designed for low-voltage applications.
• It features 3-state outputs, allowing multiple devices to share a common bus.
• The device supports 5V-tolerant inputs, making it compatible with mixed-voltage systems.
• Optimized for high-speed operation while maintaining low power consumption.

Features:

• Low-Voltage Operation: Supports 2.0V to 3.6V power supply.
• 5V-Tolerant Inputs: Can interface with 5V logic signals safely.
• High Drive Capability: ±24mA output drive current.
• 3-State Outputs: Allows bus-oriented applications.
• Power-Down Protection: Inputs and outputs include circuitry to prevent damage when power is off.
• ESD Protection: ≥2000V (Human Body Model).

This IC is commonly used in data buses, memory interfaces, and general-purpose buffering in low-voltage digital systems.

Would you like additional details on pin configuration or application notes?

# TC74LCX16244AFT: Application Scenarios, Design Pitfalls, and Implementation Considerations

## 1. Practical Application Scenarios

The TC74LCX16244AFT, a 16-bit bus buffer from Toshiba, is designed for low-voltage (2.3V–3.6V) digital systems requiring high-speed, bidirectional data flow with minimal propagation delay. Key applications include:

1.1. Microprocessor and Memory Interface Buffering

The device is widely used in embedded systems to isolate and drive high-capacitance buses, such as those connecting microprocessors to memory (SRAM, Flash). Its 5V-tolerant inputs allow seamless interfacing with mixed-voltage systems, preventing signal degradation.

1.2. Data Communication Systems

In networking hardware (switches, routers), the TC74LCX16244AFT ensures clean signal transmission across backplanes or between PHY and MAC layers. Its low-noise characteristics minimize crosstalk in high-frequency data transfers.

1.3. Industrial Control Systems

PLC and motor control systems leverage the buffer’s robust ESD protection (≥2000V HBM) to enhance signal integrity in electrically noisy environments. Bidirectional capability simplifies bus management in multi-master architectures.

1.4. Consumer Electronics

Used in smart TVs and set-top boxes, the IC mitigates voltage level mismatches between processors and peripheral ICs (HDMI controllers, sensors).

## 2. Common Design Pitfalls and Avoidance Strategies

2.1. Improper Power Sequencing

Pitfall: Powering inputs before VCC can latch the device or cause excessive current draw.

Solution: Implement sequenced power-up circuits or use voltage supervisors to ensure VCC stabilizes first.

2.2. Signal Integrity Degradation

Pitfall: Long, unterminated traces introduce reflections, especially at >100MHz.

Solution: Use controlled impedance traces (e.g., 50Ω) and series termination resistors near the driver.

2.3. Thermal Management Oversights

Pitfall: High bus contention (simultaneous driving) increases ICC, leading to overheating.

Solution: Design firmware to avoid bus conflicts or implement hardware arbitration.

2.4. Incorrect Bidirectional Control

Pitfall: Floating direction control pins (DIR) cause undefined output states.

Solution: Tie unused DIR pins to a defined logic level via pull-up/down resistors.

## 3. Key Technical Considerations for Implementation

3.1. Voltage Compatibility

• Ensure input voltages do not exceed 5.5V, even when VCC = 0V, to avoid damage.
• For mixed-voltage designs, verify level-shifting requirements for non-3.3V peripherals.

3.2. Timing Constraints

• Propagation delay (tPD ≈ 3.8ns max at 3.3V) impacts high-speed designs; synchronize with clock margins.

3.3. Layout Best Practices

• Place decoupling capacitors (0.1μF) within 5mm of VCC/GND pins.
• Route critical signals away from high-current paths to reduce inductive coupling