Overview
The SN74LV245ADWR is an octal bus transceiver with 3-state outputs, designed by Texas Instruments. This device is optimized for asynchronous communication between data buses, allowing data transmission from the A bus to the B bus or vice versa, based on the logic level at the direction-control (DIR) input. The output-enable (OE) input can be used to disable the device, effectively isolating the buses. The SN74LV245ADWR supports partial-power-down applications using Ioff circuitry, which prevents damaging current backflow when the device is powered down.
Key Specifications
| Parameter | Unit | Min | Typ | Max |
|---|---|---|---|---|
| VCC Supply Voltage Range | V | 2 | - | 5.5 |
| Maximum tpd at 5 V | ns | - | - | 6.5 |
| VOL(P) Quiet Output, Maximum Dynamic VOL at VCC = 3.3 V, TA = 25°C | V | 0.5 | 0.8 | - |
| VOH(V) Quiet Output, Minimum Dynamic VOH at VCC = 3.3 V, TA = 25°C | V | 2.9 | - | - |
| VIH(D) High-Level Dynamic Input Voltage at VCC = 3.3 V, TA = 25°C | V | - | 2.31 | - |
| VIL(D) Low-Level Dynamic Input Voltage at VCC = 3.3 V, TA = 25°C | V | - | 0.99 | - |
| Cpd Power Dissipation Capacitance at VCC = 3.3 V, f = 10 MHz | pF | - | 20 | - |
| Operating Free-Air Temperature Range | °C | -55 | - | 125 |
Key Features
- Operates from 2-V to 5.5-V VCC.
- Maximum propagation delay (tpd) of 6.5 ns at 5 V.
- Typical VOLP (output ground bounce) < 0.8 V at VCC = 3.3 V, TA = 25°C.
- Typical VOHV (output VOH undershoot) > 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 – 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
Q & A
- What is the operating voltage range of the SN74LV245ADWR?
The SN74LV245ADWR operates from 2-V to 5.5-V VCC.
- What is the maximum propagation delay (tpd) at 5 V?
The maximum propagation delay (tpd) at 5 V is 6.5 ns.
- How does the device handle partial-power-down mode?
The device supports partial-power-down mode using Ioff circuitry, which disables the outputs to prevent damaging current backflow when the device is powered down.
- What kind of ESD protection does the SN74LV245ADWR have?
The device has ESD protection that exceeds JESD 22 – 2000-V Human-Body Model, 200-V Machine Model, and 1000-V Charged-Device Model.
- Can the SN74LV245ADWR perform voltage translation?
Yes, the device allows down voltage translation from 5 V to 3.3 V and supports mixed-mode signal operation on all ports).
- How does the device minimize output ringing?
The device minimizes output ringing through slow edge rates).
- What is the purpose of the output-enable (OE) input?
The output-enable (OE) input can be used to disable the device, effectively isolating the buses).
- What is the operating free-air temperature range of the SN74LV245ADWR?
The operating free-air temperature range is from -55°C to 125°C).
- How should unused inputs be handled to ensure proper device operation?
All unused inputs of the device must be held at VCC or GND to ensure proper device operation).
- What are some common applications of the SN74LV245ADWR?
Common applications include servers, LED displays, network switches, telecom infrastructure, motor drivers, and I/O expanders).
