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TC74HC646AP from TOSHIBA

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TC74HC646AP

Manufacturer: TOSHIBA, TOS

CMOS Digital Integrated Circuit Silicon Monolithic Octal Bus Transceiver/Register (3-state)

Partnumber Manufacturer Quantity Availability
TC74HC646AP TOSHIBA, TOS 465 In Stock

Description and Introduction

CMOS Digital Integrated Circuit Silicon Monolithic Octal Bus Transceiver/Register (3-state) The **TC74HC646AP** is a high-speed CMOS octal bus transceiver and register manufactured by **TOSHIBA**. Below are its key specifications, descriptions, and features:

### **Specifications:**  
- **Technology:** High-Speed CMOS  
- **Supply Voltage (VCC):** 2V to 6V  
- **Operating Temperature Range:** -40°C to +85°C  
- **Input/Output Compatibility:** TTL levels  
- **Package Type:** 24-pin DIP (Plastic)  
- **Logic Type:** Octal Bus Transceiver/Register (3-state)  
- **High-Level Output Current (IOH):** -5.2 mA  
- **Low-Level Output Current (IOL):** 5.2 mA  
- **Propagation Delay (Max):** 24 ns (at 4.5V)  

### **Descriptions:**  
- The **TC74HC646AP** is an **8-bit bidirectional bus transceiver** with **3-state outputs** and **storage registers** on both A and B ports.  
- It allows **bidirectional data flow** between two buses (A and B) with direction control.  
- Includes **output enable (OE)** and **direction control (DIR)** inputs for flexible bus management.  
- Features **latch-up protection** and **high noise immunity** typical of CMOS devices.  

### **Features:**  
- **Bidirectional data transfer** between A and B buses.  
- **Independent register storage** for A and B ports.  
- **3-state outputs** for bus-oriented applications.  
- **Low power consumption** (ICC = 4 µA max at 25°C).  
- **High-speed operation** compatible with TTL levels.  
- **Wide operating voltage range** (2V to 6V).  
- **Latch-up performance exceeds 300 mA** (JESD 78).  

For detailed timing diagrams and pin configurations, refer to the **TOSHIBA datasheet**.

Application Scenarios & Design Considerations

CMOS Digital Integrated Circuit Silicon Monolithic Octal Bus Transceiver/Register (3-state)

Alternative Part Number

  • SN74HC646NT --: Same HC-series octal bus transceiver/register with 3-state outputs, directly pin-compatible and functionally equivalent.
  • MC74HC646ADW --: HC-family octal transceiver/register with matching function and pinout, suitable drop-in replacement.
  • CD74HC646E --: Equivalent HC-series octal bus transceiver/register with 3-state outputs, same logic function and pin configuration.
  • MC74HC646AN --: HC-family octal bus transceiver/register with equivalent pinout and logic function, suitable drop-in replacement in most designs.

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