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. The SN74LV245A operates over a wide voltage range of 2 V to 5.5 V, making it versatile for various applications.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC (Supply Voltage) | V | 2 | 5.5 | |
| VIH (High-level Input Voltage) at VCC = 2 V | V | 1.5 | ||
| VIH (High-level Input Voltage) at VCC = 2.3 V to 2.7 V | V | VCC × 0.7 | ||
| VIL (Low-level Input Voltage) at VCC = 2 V | V | 0.5 | ||
| VIL (Low-level Input Voltage) at VCC = 2.3 V to 2.7 V | V | VCC × 0.3 | ||
| tpd (Propagation Delay) at VCC = 5 V, CL = 15 pF | ns | 4.3 | 5.5 | 6.5 |
| IOZ (High-Impedance State Current) at VO = VCC or GND | µA | ±5 | ||
| ICC (Quiescent Current) at VI = VCC or GND, IO = 0 | µA | 20 | ||
| Ioff (Partial-Power-Down Current) | µA | 5 |
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.
- 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, 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
Q & A
- What is the voltage range for 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.
- Does the SN74LV245A support mixed-mode voltage operation? Yes, it supports mixed-mode voltage operation on all ports.
- What is the purpose of the Ioff feature? The Ioff feature supports partial-power-down mode operation, preventing damaging current backflow when the device is powered down.
- What kind of ESD protection does the SN74LV245A have? The SN74LV245A has ESD protection exceeding JESD 22 standards (2000-V Human-Body Model, 200-V Machine Model, 1000-V Charged-Device Model).
- Can the SN74LV245A perform voltage translation? Yes, it allows down voltage translation from 5 V to 3.3 V.
- How does the SN74LV245A minimize output ringing? The device has slow edge rates that minimize output ringing.
- What are some common applications for the SN74LV245A? Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders.
- How is the high-impedance state ensured during power-up or power-down? The high-impedance state is ensured by tying the OE input to VCC through a pull-up resistor.
- What is the function of the DIR input? The DIR input determines the direction of data transmission between the A and B buses).
