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SN74LVTH18502A from TI,Texas Instruments

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SN74LVTH18502A

Manufacturer: TI, TI/BB

3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers

Partnumber Manufacturer Quantity Availability
SN74LVTH18502A TI, TI/BB 110 In Stock

Description and Introduction

3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers The SN74LVTH18502A is a 18-bit universal bus transceiver manufactured by Texas Instruments (TI). Below are the specifications, descriptions, and features based on the available knowledge:

### **Specifications:**  
- **Technology:** 3.3V LVT (Low-Voltage BiCMOS Technology)  
- **Bus Width:** 18-bit  
- **Logic Type:** Universal Bus Transceiver  
- **Supply Voltage Range:** 2.7V to 3.6V  
- **Operating Temperature Range:** -40°C to +85°C  
- **I/O Type:** 5V Tolerant Inputs/Outputs  
- **Output Drive:** ±12mA (balanced output impedance)  
- **Propagation Delay:** Typically 3.5ns (at 3.3V)  
- **Package Options:** 56-pin SSOP (Shrink Small Outline Package), 56-pin TSSOP (Thin Shrink Small Outline Package)  

### **Description:**  
The SN74LVTH18502A is a high-performance, 18-bit universal bus transceiver designed for 3.3V systems. It combines D-type latches and D-type flip-flops to allow data flow in transparent, latched, or clocked modes. It supports bidirectional data transfer between buses operating at different voltages (with 5V tolerance).  

### **Features:**  
- **Bidirectional Data Flow:** Supports A-to-B and B-to-A transmission.  
- **Multiple Operating Modes:**  
  - Transparent (data passes through)  
  - Latched (data held on rising/falling edge of latch enable)  
  - Clocked (data registered on clock edge)  
- **Bus-Hold on Data Inputs:** Eliminates the need for external pull-up/pull-down resistors.  
- **Live Insertion Protection:** Supports hot insertion without bus disturbance.  
- **ESD Protection:** Exceeds 2000V (HBM) and 200V (Machine Model).  
- **Power-Up 3-State Outputs:** Prevents bus contention during power-up/power-down.  

This information is based on TI's official documentation for the SN74LVTH18502A.

Application Scenarios & Design Considerations

3.3-V ABT Scan Test Devices With 18-Bit Universal Bus Transceivers

Alternative Part Number

  • 74LVTH18502ADGG --: Same 18-bit universal bus transceiver function with boundary scan, available from a second source with comparable LVTH speed and 3.3V operation.
  • CY74FCT18502AT --: FCT-series 18-bit universal bus transceiver with similar boundary-scan capability and 5V-tolerant I/O, suitable as a functional substitute.
  • 74ABT18502 --: ABT-family 18-bit universal bus transceiver offering similar drive and boundary-scan features, usable where LVTH-specific low-voltage thresholds are not critical.
  • 74LVT18502A --: Same LVT-family 18-bit universal bus transceiver with boundary-scan-like functionality; NXP offers a functionally equivalent device in the same logic family.
  • 74ABT18502A --: ABT-family 18-bit universal bus transceiver with similar scan support and comparable speed/voltage characteristics, suitable as a functional replacement.
  • 74LVTH18502A --: LVTH-series 18-bit universal bus transceiver from a different vendor, matching the original's low-voltage TTL-compatible bus-hold features.

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