Overview
The 74AHCT245PW,112 is an octal bus transceiver with 3-state outputs, produced by Nexperia (formerly part of NXP Semiconductors). This device is designed for bidirectional data transmission and features an output enable (OE) and a send/receive (DIR) pin for direction control. A HIGH on the OE pin causes the outputs to assume a high-impedance OFF-state, making it suitable for various logic applications. The device is compatible with both CMOS and TTL logic levels, depending on the specific variant, but the 74AHCT245 specifically operates at TTL levels.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| VCC supply voltage | 4.5 | 5.0 | 5.5 | V |
| VI input voltage | 0 | - | 5.5 | V |
| VO output voltage | 0 | - | VCC | V |
| Tamb ambient temperature | -40 | - | 125 | °C |
| IO output current | -8.0 | - | 8.0 | mA |
| tpd propagation delay | - | 5.0 | - | ns |
| fmax maximum frequency | - | - | 60 | MHz |
| Package | - | - | 20-TSSOP | - |
Key Features
- Wide supply voltage range from 2.0 V to 5.5 V.
- 3-state outputs with output enable (OE) and send/receive (DIR) for direction control.
- Overvoltage tolerant inputs up to 5.5 V, allowing use in mixed voltage environments.
- All inputs have Schmitt-trigger action for improved noise immunity.
- CMOS low power dissipation.
- ESD protection: HBM exceeds 2000 V, CDM exceeds 1000 V.
- Latch-up performance exceeds 100 mA per JESD 78 Class II Level A.
Applications
- Bidirectional data transmission in digital systems.
- Use in mixed voltage environments due to overvoltage tolerant inputs.
- Logic level translation between CMOS and TTL systems.
- General-purpose logic circuits requiring 3-state outputs.
Q & A
- What is the primary function of the 74AHCT245PW?
The primary function is to act as an octal bus transceiver with 3-state outputs, enabling bidirectional data transmission between two buses.
- What is the voltage range for the VCC supply?
The VCC supply voltage range is from 4.5 V to 5.5 V.
- What type of logic levels does the 74AHCT245PW support?
The 74AHCT245PW supports TTL logic levels.
- What is the significance of the OE and DIR pins?
The OE (output enable) pin controls the output state, and the DIR (direction) pin controls the direction of data transmission.
- What is the maximum propagation delay of the 74AHCT245PW?
The maximum propagation delay is approximately 5.0 ns.
- What is the maximum frequency of operation for the 74AHCT245PW?
The maximum frequency of operation is up to 60 MHz.
- What type of package does the 74AHCT245PW come in?
The device comes in a 20-TSSOP package.
- What is the operating temperature range for the 74AHCT245PW?
The operating temperature range is from -40°C to 125°C.
- Does the 74AHCT245PW have ESD protection?
Yes, it has ESD protection exceeding 2000 V for HBM and 1000 V for CDM.
- What are some common applications of the 74AHCT245PW?
Common applications include bidirectional data transmission, logic level translation, and use in mixed voltage environments.
