Overview
The SN74AHCT245PWRG3 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, making it suitable for various bus interface applications. It operates from 4.5 V to 5.5 V and is compatible with TTL voltage levels. The device features a direction-control input (DIR) that determines the direction of data transmission between the A and B buses, and an output-enable input (OE) that can isolate the buses when needed.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Max | |
|---|---|---|---|---|---|
| VCC | TA = 25°C | V | 4.5 | - | 5.5 |
| VOH | IOH = –50 µA, VCC = 4.5 V | V | 4.4 | - | 4.4 |
| VOH | IOH = –8 mA, VCC = 4.5 V | V | 3.94 | - | 3.8 |
| tPLH | A or B to B or A, CL = 15 pF | ns | 1 | - | 10 |
| tPHL | A or B to B or A, CL = 15 pF | ns | 1 | - | 10 |
| tPZH | OE to A or B, CL = 15 pF | ns | 1 | - | 16 |
| tPZL | OE to A or B, CL = 15 pF | ns | 1 | - | 16 |
| Operating Temperature | - | °C | -40 | - | 125 |
| Package Type | - | - | - | - | TSSOP (PW) |
| Body Size | - | mm | - | - | 6.50 x 4.40 |
Key Features
- Inputs are TTL-voltage compatible.
- Latch-up performance exceeds 250 mA per JESD 17.
- Allows up voltage translation from 3.3 V to 5 V.
- Inputs accept VIH levels of 2 V and VIL levels of 0.8 V.
- Slow edge rates minimize output ringing.
- Output-enable (OE) input for bus isolation.
- Direction-control (DIR) input for determining data transmission direction.
- High-impedance state during power up or power down.
Applications
- Enable or disable a digital signal.
- Hold a signal during a controller reset.
- Debounce a switch.
- Bus interface applications where output ringing is a concern.
- Voltage translation from 3.3 V to 5 V.
Q & A
- What is the operating voltage range of the SN74AHCT245PWRG3?
The operating voltage range is from 4.5 V to 5.5 V.
- What is the purpose of the DIR input in the SN74AHCT245PWRG3?
The DIR input determines the direction of data transmission between the A and B buses.
- How does the OE input function in the SN74AHCT245PWRG3?
The OE input can be used to disable the device, effectively isolating the buses.
- What are the typical applications of the SN74AHCT245PWRG3?
Typical applications include enabling or disabling digital signals, holding signals during controller resets, debouncing switches, and voltage translation from 3.3 V to 5 V.
- What is the significance of slow edge rates in the SN74AHCT245PWRG3?
Slow edge rates minimize output ringing, which is crucial in applications where signal integrity is important.
- What is the package type and body size of the SN74AHCT245PWRG3?
The package type is TSSOP (PW) with a body size of 6.50 mm x 4.40 mm.
- What are the input voltage levels compatible with the SN74AHCT245PWRG3?
The inputs are TTL-voltage compatible, accepting VIH levels of 2 V and VIL levels of 0.8 V.
- How does the SN74AHCT245PWRG3 handle latch-up performance?
The latch-up performance exceeds 250 mA per JESD 17.
- What is the recommended operating temperature range for the SN74AHCT245PWRG3?
The recommended operating temperature range is from -40°C to 125°C.
- How should the OE input be managed during power up or power down?
The OE input should be tied to VCC through a pullup resistor to ensure a high-impedance state during power up or power down.
