Overview
The SN74LVC245APWT is an octal bus transceiver with 3-state outputs, designed and manufactured by Texas Instruments. This device is optimized for asynchronous communication between data buses and operates over a wide voltage range from 1.65 V to 3.6 V. It supports mixed-mode signal operation, allowing inputs to accept voltages up to 5.5 V, making it versatile for various applications. The device features a direction-control input (DIR) that determines the direction of data transmission between the A and B buses, and an output-enable input (OE) that can disable the device to isolate the buses.
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 | |
| Propagation Delay Time (tpd) at 3.3 V | 6.3 | ns | ||
| Operating Temperature Range | -40 | 125 | °C | |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | |||
| Package Type | TSSOP (20 pins) | |||
| Package Size | 6.50 mm × 4.40 mm |
Key Features
- Operates from 1.65 V to 3.6 V VCC.
- Inputs accept voltages up to 5.5 V.
- Maximum propagation delay time (tpd) of 6.3 ns at 3.3 V.
- 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.
- Ioff supports partial-power-down mode operation.
- Direction-control input (DIR) and output-enable input (OE) for flexible data transmission and bus isolation.
Applications
- Asynchronous communication between data buses.
- Translation between 3.3-V and 5-V environments (though the SN74LVC245A does not have separate supply rails like the SN74LVC4245A).
- Cable modem termination systems.
- Servers.
- LED displays.
Q & A
- What is the operating voltage range of the SN74LVC245APWT?
The SN74LVC245APWT operates from 1.65 V to 3.6 V.
- What is the maximum propagation delay time at 3.3 V?
The maximum propagation delay time (tpd) at 3.3 V is 6.3 ns.
- Can the inputs accept voltages higher than the VCC?
Yes, the inputs can accept voltages up to 5.5 V.
- What is the purpose of the DIR and OE inputs?
The DIR input controls the direction of data transmission between the A and B buses, and the OE input can disable the device to isolate the buses.
- What is the ESD protection level of the SN74LVC245APWT?
The device has ESD protection exceeding JESD 22 – 2000-V Human-Body Model and 1000-V Charged-Device Model.
- What are some common applications of the SN74LVC245APWT?
Common applications include asynchronous communication between data buses, cable modem termination systems, servers, and LED displays.
- What package types are available for the SN74LVC245APWT?
The device is available in TSSOP (20 pins) among other packages.
- What is the size of the TSSOP package?
The TSSOP package is 6.50 mm × 4.40 mm.
- Does the SN74LVC245APWT support mixed-mode signal operation?
Yes, it supports mixed-mode signal operation on all ports.
- What is the operating temperature range of the SN74LVC245APWT?
The operating temperature range is -40°C to 125°C.
