Overview
The SN74AHC245PWR 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. It operates within a voltage range of 2V to 5.5V, making it versatile for various applications. The device features a direction-control (DIR) input that determines the direction of data transmission between the A and B buses, and an output-enable (OE) input that can isolate the buses when needed.
Key Specifications
| Parameter | Test Conditions | Unit | Min | Max | |
|---|---|---|---|---|---|
| VCC Operating Range | - | V | 2 | - | 5.5 |
| VOH (High-Level Output Voltage) | IOH = –50 µA, VCC = 5 V | V | 4.4 | - | 4.5 |
| IOH (High-Level Output Current) | VCC = 5 V, VOH = 2.7 V | mA | - | - | -4 |
| tPLH (Propagation Delay Time, A to B) | CL = 50 pF, VCC = 5 V | ns | 4 | - | 6.5 |
| tPHL (Propagation Delay Time, B to A) | CL = 50 pF, VCC = 5 V | ns | 4 | - | 6.5 |
| Cio (Input Capacitance) | VI = VCC or GND, VCC = 5 V | pF | 4 | - | - |
| Cpd (Power Dissipation Capacitance) | No load, f = 1 MHz, VCC = 5 V | pF | 14 | - | - |
Key Features
- Operating range from 2V to 5.5V VCC, allowing for flexibility in different voltage environments.
- Latch-up performance exceeds 250mA per JESD 17, ensuring robust operation.
- Allows down voltage translation from 5 V to 3.3 V, with inputs accepting voltage levels up to 5.5 V.
- Slow edge rates minimize output ringing, reducing noise and improving signal integrity.
- Output-enable (OE) input to disable the device and isolate the buses.
- Direction-control (DIR) input to determine the direction of data transmission between the A and B buses.
Applications
- Servers and data centers for reliable data bus communication.
- PCs and notebooks for efficient data transfer.
- Network switches and telecom infrastructures for high-speed data transmission.
- Wearable health and fitness devices for low-power, reliable communication.
- Electronic points of sale (POS) systems for secure and efficient transactions.
Q & A
- What is the operating voltage range of the SN74AHC245PWR?
The SN74AHC245PWR operates within a voltage range of 2V to 5.5V.
- What is the purpose of the DIR input in the SN74AHC245PWR?
The DIR input determines the direction of data transmission between the A and B buses.
- How does the OE input function in the SN74AHC245PWR?
The OE input can be used to disable the device, effectively isolating the buses.
- What is the maximum propagation delay time for the SN74AHC245PWR at VCC = 5 V?
The maximum propagation delay time (tPLH and tPHL) is 6.5 ns for a load capacitance of 50 pF.
- What are the typical applications of the SN74AHC245PWR?
Typical applications include servers, PCs, network switches, wearable health devices, and telecom infrastructures.
- What is the latch-up performance of the SN74AHC245PWR?
The latch-up performance exceeds 250mA per JESD 17.
- How does the SN74AHC245PWR handle voltage translation?
The device allows down voltage translation from 5 V to 3.3 V and accepts input voltage levels up to 5.5 V.
- What is the input capacitance of the SN74AHC245PWR?
The input capacitance (Cio) is 4 pF when VI = VCC or GND at VCC = 5 V.
- What is the power dissipation capacitance of the SN74AHC245PWR?
The power dissipation capacitance (Cpd) is 14 pF with no load at f = 1 MHz and VCC = 5 V.
- How does the SN74AHC245PWR minimize output ringing?
The device features slow edge rates to minimize output ringing and improve signal integrity.
