Overview
The SN74AHCT245DBRG4 is an octal bus transceiver with 3-state outputs, designed by Texas Instruments for asynchronous two-way communication between data buses. This device operates within a voltage range of 4.5 V to 5.5 V, making it suitable for various digital signal processing applications. It features TTL-voltage compatible inputs and is optimized for use in systems where output ringing is a concern.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Voltage Range | 4.5 V to 5.5 V | V |
| Input Voltage Compatibility | TTL-voltage compatible | - |
| Latch-up Performance | > 250 mA per JESD 17 | mA |
| ESD Protection | > 2000-V Human-Body Model, > 200-V Machine Model, > 1000-V Charged-Device Model | V |
| Package Type | SSOP (20 pins) | - |
| Package Dimensions | 7.50 mm x 5.30 mm | mm |
| Operating Temperature Range | -40°C to 125°C | °C |
| Propagation Delay (A or B to B or A) | 4.5 ns to 10 ns (typical to maximum) | ns |
| Output Enable Time (OE to A or B) | 8.9 ns to 16 ns (typical to maximum) | ns |
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.
- Allows voltage translation from 3.3 V to 5 V.
- Slow edge rates minimize output ringing.
- Output-enable (OE) input can isolate the buses.
- High-impedance state during power up or power down when OE is tied to VCC through a pullup resistor.
Applications
- Enable or disable digital signals.
- Hold signals during a controller reset.
- Debounce switches.
- Bus interface applications where output ringing is a concern.
- Voltage translation from 3.3 V to 5 V systems.
Q & A
- What is the operating voltage range of the SN74AHCT245DBRG4?
The operating voltage range is from 4.5 V to 5.5 V.
- What type of input voltage compatibility does the SN74AHCT245DBRG4 have?
The inputs are TTL-voltage compatible.
- What is the latch-up performance of the SN74AHCT245DBRG4?
The latch-up performance exceeds 250 mA per JESD 17.
- What kind of ESD protection does the SN74AHCT245DBRG4 offer?
The device offers ESD protection exceeding JESD 22 standards.
- What is the package type and dimensions of the SN74AHCT245DBRG4?
The package type is SSOP with 20 pins, and the dimensions are 7.50 mm x 5.30 mm.
- What is the operating temperature range of the SN74AHCT245DBRG4?
The operating temperature range is from -40°C to 125°C.
- How does the SN74AHCT245DBRG4 handle voltage translation?
The device allows voltage translation from 3.3 V to 5 V systems.
- What is the purpose of the output-enable (OE) input in the SN74AHCT245DBRG4?
The OE input can be used to isolate the buses and put the outputs in a high-impedance state.
- How can you prevent output ringing in the SN74AHCT245DBRG4?
The device's slow edge rates help minimize output ringing.
- What are some common applications of the SN74AHCT245DBRG4?
Common applications include enabling or disabling digital signals, holding signals during a controller reset, debouncing switches, and bus interface applications where output ringing is a concern.
