Overview
The SN74LV245A, produced by Texas Instruments, is an octal bus transceiver designed for asynchronous communication between data buses. This device can transmit data from the A bus to the B bus or from the B bus to the A bus, depending on the logic level at the direction-control (DIR) input. The output-enable (OE) input allows for disabling the device, effectively isolating the buses. It operates within a voltage range of 2 V to 5.5 V, making it versatile for various applications. The SN74LV245A is particularly useful in scenarios where output ringing is a concern, thanks to its low drive and slow edge rates that minimize overshoot and undershoot on the outputs.
Key Specifications
| Parameter | Unit | Min | Max |
|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5.5 |
| VIH (High-level Input Voltage) | V | VCC × 0.7 | VCC × 0.7 |
| VIL (Low-level Input Voltage) | V | VCC × 0.3 | VCC × 0.3 |
| tpd (Propagation Delay) at VCC = 5 V | ns | 4.3 | 6.5 |
| tpd (Propagation Delay) at VCC = 3.3 V | ns | 5.9 | 11 |
| VOLP (Output Ground Bounce) | V | - | <0.8 |
| VOHV (Output VOH Undershoot) | V | >2.3 | - |
| ESD Protection | - | 2000-V Human-Body Model | - |
| Operating Temperature Range | °C | -40 | 125 |
Key Features
- Operates over a wide voltage range of 2 V to 5.5 V.
- Maximum propagation delay of 6.5 ns at 5 V.
- Typical output ground bounce (VOLP) < 0.8 V at VCC = 3.3 V, TA = 25°C.
- Typical output VOH undershoot (VOHV) > 2.3 V at VCC = 3.3 V, TA = 25°C.
- Supports mixed-mode voltage operation on all ports.
- Ioff supports partial-power-down mode operation.
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22 standards: 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Allows down voltage translation from 5 V to 3.3 V.
- Slow edge rates minimize output ringing.
Applications
- Servers
- LED displays
- Network switches
- Telecom infrastructure
- Motor drivers
- I/O expanders
The SN74LV245A is suitable for various bus-interface type applications where output ringing is a concern. Its low drive and slow edge rates make it ideal for minimizing overshoot and undershoot on the outputs.
Q & A
- What is the operating voltage range of the SN74LV245A?
The SN74LV245A operates over a voltage range of 2 V to 5.5 V.
- What is the maximum propagation delay at 5 V?
The maximum propagation delay at 5 V is 6.5 ns.
- What is the typical output ground bounce (VOLP) at VCC = 3.3 V?
The typical output ground bounce (VOLP) is less than 0.8 V at VCC = 3.3 V, TA = 25°C.
- Does the SN74LV245A support mixed-mode voltage operation?
Yes, the SN74LV245A supports mixed-mode voltage operation on all ports.
- What is the ESD protection level of the SN74LV245A?
The SN74LV245A has ESD protection exceeding JESD 22 standards: 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Can the SN74LV245A be used in partial-power-down mode?
Yes, the SN74LV245A supports partial-power-down mode operation using Ioff circuitry.
- What are some common applications of the SN74LV245A?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- How does the SN74LV245A minimize output ringing?
The SN74LV245A minimizes output ringing through its low drive and slow edge rates.
- What is the operating temperature range of the SN74LV245A?
The operating temperature range is from -40°C to 125°C.
- Can the SN74LV245A perform down voltage translation?
Yes, the SN74LV245A allows down voltage translation from 5 V to 3.3 V.
