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SN74AS646DW from TI,Texas Instruments

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SN74AS646DW

Manufacturer: TI, 管装

Octal Bus Transceivers/Registers With 3-State Outputs

Partnumber Manufacturer Quantity Availability
SN74AS646DW TI, 管装 2600 In Stock

Description and Introduction

Octal Bus Transceivers/Registers With 3-State Outputs The SN74AS646DW is a bidirectional bus transceiver and register manufactured by Texas Instruments (TI).  

### **Specifications:**  
- **Logic Type:** Octal Bus Transceiver with 3-State Outputs  
- **Number of Bits:** 8  
- **Voltage Supply:** 4.5V to 5.5V  
- **Operating Temperature:** 0°C to 70°C  
- **Package Type:** SOIC (DW)  
- **Mounting Type:** Surface Mount  
- **Output Type:** 3-State  
- **Propagation Delay:** 10ns (Max)  
- **High-Level Output Current:** -15mA  
- **Low-Level Output Current:** 48mA  

### **Descriptions:**  
The SN74AS646DW combines an octal D-type flip-flop with a bidirectional transceiver, allowing data transfer between two buses in either direction. It features separate control inputs for data flow direction and output enable.  

### **Features:**  
- **Bidirectional Data Flow:** Controlled by DIR (Direction) input  
- **3-State Outputs:** Allows bus isolation  
- **Independent Clocking:** Separate clock inputs for A-to-B and B-to-A transfers  
- **Wide Operating Voltage:** 4.5V to 5.5V  
- **High-Current Outputs:** Suitable for driving bus lines  
- **Latch-Up Performance:** Exceeds 500mA per JESD 17  

This device is commonly used in bus-oriented systems requiring bidirectional data transfer with storage capability.

Application Scenarios & Design Considerations

Octal Bus Transceivers/Registers With 3-State Outputs

Alternative Part Number

  • 74F646SPC --: Octal bus transceiver/register with the same 646 function set in a 24-pin DIP-compatible family; pin-compatible logic function and widely available as a second source.
  • MC74ACT646DW --: Octal bus transceiver/register with 3-state outputs in a 24-pin SOIC package, functionally equivalent to the 646 device and suitable as a direct socket replacement.
  • CD74ACT646M --: Same 646 octal transceiver/register function from the same vendor in a 24-pin SOIC package, offering a close electrical match with ACT-family speed and drive.

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