Overview
The SN74HCT245PW is an octal bus transceiver with 3-state outputs, manufactured by Texas Instruments. This device is designed for asynchronous two-way communication between data buses and is particularly useful in logic systems for isolation and increasing drive strength. It operates within a voltage range of 4.5 V to 5.5 V, making it forgiving of 5-V power supply rail accuracy. The SN74HCT245PW features an active low output enable (OE) and a direction control (DIR) pin, allowing for flexible data transmission and reception.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Voltage Supply Range | 4.5 to 5.5 | V |
| Number of Bits | 8 | - |
| Output Drive Capability | ±6 | mA |
| Propagation Delay (tpd) | 10 to 30 ns (depending on load) | ns |
| Maximum Frequency | 36 | MHz |
| Operating Temperature Range | -40 to 85 | °C |
| Package Type | 20-TSSOP (0.173", 4.40mm Width) | - |
| Junction-to-Ambient Thermal Resistance (RθJA) | 99 | K/W |
| Junction-to-Case Thermal Resistance (RθJC) | 43.5 | K/W |
Key Features
- Active Low Output Enable (OE): Allows all ports to be placed in a high impedance state when OE is high.
- Direction Control (DIR): Enables bidirectional data transmission between two buses.
- TTL-Voltage Compatible Inputs: Ensures compatibility with TTL logic levels.
- Low Power Consumption: Maximum static supply current of 80 µA.
- Balanced Propagation Delay and Output Drive: Typically 14 ns propagation delay and balanced output drive of ±6 mA at 5 V.
- Center VCC and GND Pin Configuration: Minimizes high-speed switching noise.
Applications
- Logic Systems: For isolation and increasing drive strength in digital circuits.
- Data Bus Communication: Asynchronous two-way communication between data buses.
- Embedded Systems: In various embedded systems requiring robust and reliable data transmission.
- Industrial Automation: For reliable data communication in industrial control systems.
Q & A
- What is the voltage supply range for the SN74HCT245PW?
The voltage supply range is from 4.5 V to 5.5 V.
- How many bits does the SN74HCT245PW support?
The device supports 8 bits.
- What is the output drive capability of the SN74HCT245PW?
The output drive capability is ±6 mA.
- What is the typical propagation delay of the SN74HCT245PW?
The typical propagation delay is around 14 ns, but it can vary depending on the load (CL = 50 pF or CL = 150 pF).
- What is the maximum operating frequency of the SN74HCT245PW?
The maximum operating frequency is 36 MHz.
- What is the operating temperature range for the SN74HCT245PW?
The operating temperature range is from -40°C to 85°C.
- What type of package does the SN74HCT245PW come in?
The device comes in a 20-TSSOP package.
- Is the SN74HCT245PW RoHS compliant?
Yes, the SN74HCT245PW is RoHS compliant.
- What is the purpose of the DIR and OE pins on the SN74HCT245PW?
The DIR pin controls the direction of data transmission, and the OE pin is an active low output enable that places all ports in a high impedance state when high.
- How does the center VCC and GND pin configuration benefit the SN74HCT245PW?
The center VCC and GND pin configuration minimizes high-speed switching noise.
