Overview
The SN74HCT245DW is an octal bus transceiver produced by Texas Instruments, designed for asynchronous two-way communication between data buses. This device is part of the 74HCT series, which is compatible with TTL (Transistor-Transistor Logic) voltage levels and operates within a voltage range of 4.5 V to 5.5 V. The SN74HCT245DW is particularly useful in applications where data needs to be transmitted between two buses, such as in factory automation, grid infrastructure, and telecom infrastructure.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Operating Voltage Range | 4.5 | 5.5 | V | |
| High-Level Output Voltage (IOH = -20 µA, TA = 25°C) | 4.4 | 4.499 | V | |
| Low-Level Output Voltage (IOL = 20 µA, TA = 25°C) | 0.001 | 0.1 | V | |
| Input Current (DIR or OE, VI = VCC or 0, TA = 25°C) | ±0.1 | ±100 nA | ||
| Off-State Output Current (VO = VCC or 0, TA = 25°C) | ±0.01 | ±0.5 µA | ||
| Supply Current (VI = VCC or 0, IO = 0, TA = 25°C) | 8 | 80 | µA | |
| Propagation Delay (tpd) at CL = 50 pF, TA = 25°C | 14 | 20 | 25 | ns |
| Output Drive at 5 V | ±6 | mA | ||
| Package Type | SOIC DW 20 | |||
| Operating Temperature Range | -40 | 85 | °C |
Key Features
- Operating voltage range of 4.5 V to 5.5 V, making it forgiving of 5-V power supply rail accuracy.
- High-Current 3-state outputs capable of driving bus lines directly or up to 15 LSTTL loads.
- Low power consumption with a maximum static supply current of 80 µA.
- Typical propagation delay of 14 ns and balanced output drive of ±6 mA at 5 V.
- Inputs are TTL-voltage compatible.
- Active low output enable (OE) and direction control (DIR) inputs.
- Center VCC and GND pin configurations to minimize high-speed switching noise.
Applications
- Factory Automation and Control
- Grid Infrastructure
- Electronic Point of Sale
- Multi-Function Printers
- Motor Drives
- Storage
- Telecom Infrastructure
Q & A
- What is the operating voltage range of the SN74HCT245DW?
The operating voltage range is from 4.5 V to 5.5 V.
- What is the typical propagation delay of the SN74HCT245DW?
The typical propagation delay is 14 ns.
- How many LSTTL loads can the outputs drive?
The outputs can drive up to 15 LSTTL loads.
- What is the maximum static supply current of the SN74HCT245DW?
The maximum static supply current is 80 µA.
- Are the inputs TTL-voltage compatible?
- What is the purpose of the output enable (OE) and direction control (DIR) inputs?
The OE input can disable the device to isolate the buses, and the DIR input controls the direction of data transmission between the A and B buses.
- What are some common applications of the SN74HCT245DW?
Common applications include factory automation, grid infrastructure, electronic point of sale, multi-function printers, motor drives, storage, and telecom infrastructure.
- What package type is the SN74HCT245DW available in?
The SN74HCT245DW is available in the SOIC DW 20 package.
- What is the operating temperature range of the SN74HCT245DW?
The operating temperature range is from -40°C to 85°C.
- How does the SN74HCT245DW help in signal transmission over long distances?
The device acts as a high-current drive transceiver, amplifying the signal to ensure it reaches the distant end of the cable, thereby improving signal strength and allowing for longer cable lengths.
