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 the device to be disabled, 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) | V | 1.5 (VCC = 2 V) | 0.7 * VCC (VCC = 2.3 V to 5.5 V) | 0.7 * VCC (VCC = 2.3 V to 5.5 V) |
| VIL (Low-level Input Voltage) | V | 0.5 (VCC = 2 V) | 0.3 * VCC (VCC = 2.3 V to 5.5 V) | 0.3 * VCC (VCC = 2.3 V to 5.5 V) |
| tpd (Propagation Delay) | ns | 4.3 (VCC = 5 V, CL = 15 pF) | 5.5 (VCC = 5 V, CL = 15 pF) | 6.5 (VCC = 5 V, CL = 15 pF) |
| ten (Enable Time) | ns | 5.7 (VCC = 5 V, CL = 15 pF) | 8.5 (VCC = 5 V, CL = 15 pF) | 10.5 (VCC = 5 V, CL = 15 pF) |
| tdis (Disable Time) | ns | 7.8 (VCC = 5 V, CL = 15 pF) | 12.8 (VCC = 5 V, CL = 15 pF) | 14.7 (VCC = 5 V, CL = 15 pF) |
| ICC (Quiescent Current) | µA | 20 | 20 | |
| Ioff (Partial Power-Down Current) | µA | 5 | 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).
- Slow edge rates minimize output ringing.
- Allows down voltage translation from 5 V to 3.3 V.
Applications
- Servers
- LED displays
- Network switches
- Telecom infrastructure
- Motor drivers
- I/O expanders
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.
- 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 through the device when it is powered down.
- What are the ESD protection specifications for the SN74LV245A?
The device exceeds JESD 22 standards with 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model ESD protection.
- How does the SN74LV245A handle latch-up performance?
The latch-up performance exceeds 250 mA per JESD 17.
- 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 does the SN74LV245A minimize output ringing?
The device minimizes output ringing through slow edge rates.
- Can the SN74LV245A perform voltage translation?
Yes, it allows down voltage translation from 5 V to 3.3 V.
- What is the function of the DIR and OE inputs?
The DIR input controls the direction of data transmission between the A and B buses, while the OE input can disable the device to isolate the buses.
