Overview
The SN74LVC4245APW is an octal bus transceiver and 3.3-V to 5-V shifter with 3-state outputs, manufactured by Texas Instruments. This device is designed for asynchronous communication between data buses, allowing for bidirectional voltage translation between 3.3-V and 5-V environments. It features two separate supply rails: VCCA for the A port set at 5 V and VCCB for the B port set at 3.3 V. The device includes control inputs for direction (DIR) and output enable (OE), which are powered by VCCA. This configuration enables the device to transmit data from the A bus to the B bus or vice versa, and to isolate the buses when necessary.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Package | TSSOP (PW) | - |
| Pins | 24 | - |
| Operating Temperature Range | -40 to 85 | °C |
| VCCA Supply Voltage Range | 4.5 to 5.5 | V |
| VCCB Supply Voltage Range | 2.7 to 3.6 | V |
| Input Voltage Range (A port) | -0.5 to VCCA + 0.5 | V |
| Output Voltage Range (A port) | -0.5 to VCCA + 0.5 | V |
| Propagation Delay Time (A to B) | 6.1 to 6.3 | ns |
| Propagation Delay Time (B to A) | 5 to 6.7 | ns |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | - |
| Latch-Up Performance | Exceeds 250 mA per JESD 17 | - |
Key Features
- Bidirectional voltage translator between 3.3-V and 5-V environments.
- Control inputs (DIR, OE) powered by VCCA, allowing for bus isolation.
- 3-state outputs to prevent bus contention.
- ESD protection exceeds JESD 22 standards (2000-V Human-Body Model, 1000-V Charged-Device Model).
- Latch-up performance exceeds 250 mA per JESD 17.
- Supports mixed-mode signal operation on all ports...
Applications
- Asynchronous communication between data buses in mixed-voltage systems.
- Cable modem termination systems...
- Servers and data centers requiring voltage translation...
- LED displays and other digital display systems...
- General-purpose logic and signal translation in various electronic devices.
Q & A
- What is the primary function of the SN74LVC4245APW?
The primary function is to act as an octal bus transceiver and 3.3-V to 5-V shifter with 3-state outputs, enabling asynchronous communication between data buses in mixed-voltage systems.
- What are the supply voltage ranges for VCCA and VCCB?
VCCA ranges from 4.5 V to 5.5 V, and VCCB ranges from 2.7 V to 3.6 V.
- What is the propagation delay time for the SN74LVC4245APW?
The propagation delay time from A to B is 6.1 to 6.3 ns, and from B to A is 5 to 6.7 ns.
- What kind of ESD protection does the SN74LVC4245APW offer?
The device offers ESD protection exceeding JESD 22 standards, including 2000-V Human-Body Model and 1000-V Charged-Device Model.
- What is the latch-up performance of the SN74LVC4245APW?
The latch-up performance exceeds 250 mA per JESD 17.
- What package options are available for the SN74LVC4245APW?
The device is available in TSSOP (PW) package with 24 pins.
- How does the output-enable (OE) input function?
The output-enable (OE) input can be used to disable the device, effectively isolating the buses.
- What are some common applications of the SN74LVC4245APW?
Common applications include asynchronous communication in mixed-voltage systems, cable modem termination systems, servers, and LED displays.
- What is the operating temperature range of the SN74LVC4245APW?
The operating temperature range is from -40°C to 85°C.
- Can the SN74LVC4245APW be used in safety-critical applications?
No, it is not recommended for use in safety-critical applications. Refer to the device's documentation for important disclaimers and notices.
