Overview
The SN74AHCT245PWRE4 is an octal bus transceiver with 3-state outputs, designed by Texas Instruments. This component is optimized for asynchronous two-way communication between data buses, operating within a voltage range of 4.5 V to 5.5 V. It is particularly useful in applications where voltage translation between 3.3 V and 5 V is required. The device features TTL-voltage compatible inputs and outputs, making it versatile for various digital signal processing tasks.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Max | |
|---|---|---|---|---|---|
| VCC | TA = 25°C | V | 4.5 | 5 | 5.5 |
| VOH | IOH = –50 µA | V | 4.4 | 4.5 | 4.4 |
| VOH | IOH = –8 mA | V | 3.8 | 3.94 | 3.8 |
| tPLH | A or B to B or A, CL = 15 pF | ns | 1 | 4.5 | 10 |
| tPHL | A or B to B or A, CL = 15 pF | ns | 1 | 4.5 | 10 |
| Operating Temperature | °C | -40 | 125 | ||
| Package Type | TSSOP (PW) | ||||
| Body Size (Nom) | mm | 6.50 x 4.40 |
Key Features
- Inputs are TTL-voltage compatible, accepting VIH levels of 2 V and VIL levels of 0.8 V.
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22 standards (2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model).
- Allows voltage translation from 3.3 V to 5 V.
- Slow edge rates minimize output ringing.
- Output-enable (OE) input can be used to disable the device, isolating the buses.
Applications
- Enable or disable a digital signal.
- Hold a signal during a controller reset.
- Debounce a switch.
- Voltage translation between 3.3 V and 5 V in digital systems.
- Bus interface applications where output ringing is a concern.
Q & A
- What is the operating voltage range of the SN74AHCT245PWRE4?
The operating voltage range is from 4.5 V to 5.5 V.
- What types of inputs are compatible with the SN74AHCT245PWRE4?
The inputs are TTL-voltage compatible.
- What is the purpose of the output-enable (OE) input?
The OE input can be used to disable the device, effectively isolating the buses.
- What is the package type of the SN74AHCT245PWRE4?
The package type is TSSOP (PW).
- What are the body dimensions of the TSSOP package?
The body dimensions are 6.50 mm x 4.40 mm.
- What is the operating temperature range of the SN74AHCT245PWRE4?
The operating temperature range is from -40°C to 125°C.
- Does the SN74AHCT245PWRE4 support voltage translation?
Yes, it supports voltage translation from 3.3 V to 5 V.
- What are some common applications of the SN74AHCT245PWRE4?
Common applications include enabling or disabling digital signals, holding signals during controller resets, debouncing switches, and voltage translation in digital systems.
- How does the SN74AHCT245PWRE4 minimize output ringing?
The device minimizes output ringing through slow edge rates.
- What are the ESD protection levels of the SN74AHCT245PWRE4?
The ESD protection exceeds JESD 22 standards (2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model).
