Overview
The SN74LVC4245APWRG4, produced by Texas Instruments, is an 8-bit (octal) noninverting bus transceiver designed for asynchronous communication between data buses operating at different voltage levels. This device features two separate supply rails: the B port operates at 3.3 V (VCCB), and the A port operates at 5 V (VCCA), enabling voltage translation from 3.3 V to 5 V and vice versa. The device can transmit data from the A bus to the B bus or from the B bus to the A bus, controlled by the direction-control (DIR) input. Additionally, the output-enable (OE) input allows the device to be disabled, effectively isolating the buses.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Supply Voltage Range (VCCA) | 2.7 to 5.5 | V |
| Supply Voltage Range (VCCB) | 2.7 to 3.6 | V |
| Input Voltage Range | -0.5 to 6.5 | V |
| Output Voltage Range | -0.5 to VCC + 0.5 | V |
| Continuous Output Current | ±50 | mA |
| Continuous Current through VCC or GND | ±100 | mA |
| Storage Temperature Range | -65 to 150 | °C |
| Operating Temperature Range | -40 to 85 | °C |
| ESD Protection | 2000-V Human-Body Model, 1000-V Charged-Device Model | V |
| Package Type | TSSOP (PW) | |
| Number of Pins | 24 |
Key Features
- Bidirectional voltage translator allowing translation from 3.3 V to 5 V and vice versa.
- Control inputs (DIR, OE) powered by VCCA.
- Inputs accept voltages up to 5.5 V.
- Latch-up performance exceeds 250 mA per JESD 17.
- ESD protection exceeds JESD 22 standards.
- 3-state outputs for bus isolation.
- Compatible with conventional 245 terminal out without board re-layout.
Applications
- Asynchronous communication between data buses operating at different voltage levels.
- Voltage translation in mixed-voltage systems.
- Cable modem termination systems.
- Servers and data centers.
- LED displays and other digital signage.
Q & A
- What is the primary function of the SN74LVC4245APWRG4?
The primary function is to act as an 8-bit noninverting bus transceiver for asynchronous communication between data buses operating at different voltage levels (3.3 V and 5 V).
- How does the device handle voltage translation?
The device translates voltage from 3.3 V to 5 V and vice versa using separate supply rails for each port (VCCA for A port and VCCB for B port).
- What is the role of the DIR and OE inputs?
The DIR input controls the direction of data transmission (A to B or B to A), and the OE input can disable the device to isolate the buses.
- What are the operating temperature and storage temperature ranges?
The operating temperature range is -40°C to 85°C, and the storage temperature range is -65°C to 150°C.
- What type of ESD protection does the device offer?
The device offers ESD protection exceeding JESD 22 standards, including 2000-V Human-Body Model and 1000-V Charged-Device Model.
- What package types are available for the SN74LVC4245APWRG4?
The device is available in TSSOP (PW) package with 24 pins.
- Can the device be used in mixed-voltage systems?
Yes, the device is designed for use in mixed-voltage systems, allowing voltage translation between 3.3 V and 5 V environments.
- What are some common applications of the SN74LVC4245APWRG4?
Common applications include cable modem termination systems, servers, LED displays, and other digital signage.
- How does the device protect against latch-up?
The device has latch-up performance that exceeds 250 mA per JESD 17 standards.
- Can the device be used without modifying the board layout for conventional 245 terminal out?
Yes, the device allows designers to switch to a normal all-3.3-V or all-5-V 20-terminal SN74LVC4245 device without board re-layout.
