Overview
The SN74LVC245APWE4, produced by Texas Instruments, is an octal bus transceiver with 3-state outputs designed for asynchronous communication between data buses. This device operates over a wide voltage range from 1.65 V to 3.6 V, making it versatile for various applications. It supports mixed-mode signal operation, allowing inputs to accept voltages up to 5.5 V, even when the VCC is at 3.3 V. The SN74LVC245A is particularly useful in systems that require data transmission between different voltage domains.
Key Specifications
| Parameter | Min | Max | Unit | Conditions |
|---|---|---|---|---|
| VCC Supply Voltage Range | -0.5 | 6.5 | V | |
| VI Input Voltage Range | -0.5 | 6.5 | V | |
| VO Output Voltage Range | -0.5 | 6.5 | V | In high-impedance or power-off state |
| Propagation Delay Time (tpd) | 6.3 | ns | At VCC = 3.3 V, TA = 25°C | |
| Operating Temperature Range | -40 | 125 | °C | |
| ESD Protection | 2000 | V | Human-Body Model | |
| ESD Protection | 1000 | V | Charged-Device Model |
Key Features
- Operates from 1.65 V to 3.6 V VCC.
- Inputs accept voltages up to 5.5 V.
- Maximum propagation delay time of 6.3 ns at 3.3 V.
- Typical output ground bounce (VOLP) < 0.8 V at VCC = 3.3 V, TA = 25°C.
- Supports mixed-mode signal operation on all ports (5-V input/output voltage with 3.3-V VCC).
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22 – 2000-V Human-Body Model and 1000-V Charged-Device Model.
- Supports partial-power-down mode operation.
Applications
- Asynchronous communication between data buses in various electronic systems.
- Translation between different voltage domains (e.g., 3.3 V to 5 V and vice versa).
- Cable modem termination systems.
- Servers and data centers.
- LED displays and other digital signage.
Q & A
- What is the operating voltage range of the SN74LVC245A?
The SN74LVC245A operates from 1.65 V to 3.6 V VCC.
- What is the maximum input voltage the device can accept?
The device can accept input voltages up to 5.5 V.
- What is the propagation delay time of the SN74LVC245A at 3.3 V?
The maximum propagation delay time is 6.3 ns at 3.3 V.
- How does the direction-control (DIR) input work?
The DIR input controls the direction of data transmission. When high, data propagates from the A bus to the B bus, and when low, data propagates from the B bus to the A bus.
- What is the purpose of the output-enable (OE) input?
The OE input can be used to disable the device, effectively isolating the buses.
- What kind of ESD protection does the SN74LVC245A have?
The device has ESD protection exceeding 2000-V Human-Body Model and 1000-V Charged-Device Model.
- Can the SN74LVC245A be used in mixed-voltage systems?
Yes, it supports mixed-mode signal operation on all ports, allowing 5-V input/output voltage with a 3.3-V VCC.
- What is the operating temperature range of the SN74LVC245A?
The device operates over a temperature range of -40°C to 125°C.
- What are some common applications of the SN74LVC245A?
Common applications include asynchronous communication between data buses, translation between different voltage domains, cable modem termination systems, servers, and LED displays.
- How does the SN74LVC245A handle power-up and power-down states?
The device supports partial-power-down mode operation and ensures high-impedance state during power-up or power-down by tying the OE input to VCC through a pull-up resistor.
