Overview
The P82B715DG4, produced by Texas Instruments, is an I2C Bus Extender designed to buffer highly capacitive I2C bus systems. This device supports bidirectional data transfer of I2C bus signals, enabling the extension of the I2C bus while retaining all the operating modes and features of the I2C system. It is particularly useful for applications requiring long-distance I2C communications and can handle bus capacitance up to 400 pF on the main I2C bus and 3000 pF on the transmission side.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Operating Supply Voltage | 3 to 12 | V |
| Output Current | 60 | mA |
| Bus Capacitance (Main I2C Bus) | 400 | pF |
| Bus Capacitance (Transmission Side) | 3000 | pF |
| ESD Protection | 2500-V Human-Body Model, 400-V Machine Model, 1000-V Charged-Device Model | |
| Package Types | SOIC (8), PDIP (8) | |
| Package Body Size (SOIC) | 4.90 mm × 3.91 mm | |
| Package Body Size (PDIP) | 9.81 mm × 6.35 mm |
Key Features
- Supports bidirectional data transfer of I2C bus signals.
- Dual bidirectional unity-voltage-gain buffer with no external directional control required.
- Drives 10× lower-impedance bus wiring for improved noise immunity.
- Multi-drop distribution of I2C signals using low-cost twisted-pair cables.
- I2C bus operation over 50 meters of twisted-pair wire.
- Latch-up performance exceeds 100 mA per JESD 78, Class II.
- ESD protection exceeds JESD 22 standards.
- Internal current amplification to increase the current sink capability of I2C chips.
- Compatible with all logic signal drivers, including TTL.
Applications
- HDMI DDC (Display Data Channel).
- Long I2C communications.
- Industrial communications.
Q & A
- What is the operating supply voltage range of the P82B715DG4?
The operating supply voltage range is from 3 V to 12 V.
- What is the maximum output current of the P82B715DG4?
The maximum output current is 60 mA.
- How much bus capacitance can the P82B715DG4 handle on the main I2C bus?
The P82B715DG4 can handle up to 400 pF of bus capacitance on the main I2C bus.
- What is the maximum bus capacitance on the transmission side?
The maximum bus capacitance on the transmission side is 3000 pF.
- What types of ESD protection does the P82B715DG4 offer?
The P82B715DG4 offers ESD protection exceeding 2500-V Human-Body Model, 400-V Machine Model, and 1000-V Charged-Device Model.
- What are the package types available for the P82B715DG4?
The package types available are SOIC (8) and PDIP (8).
- How does the P82B715DG4 extend the I2C bus?
The P82B715DG4 extends the I2C bus by buffering both the serial data (SDA) and serial clock (SCL) signals, allowing for longer cable lengths and lower-cost wiring.
- Can multiple P82B715DG4 devices be connected together?
Yes, multiple P82B715DG4 devices can be connected together in a star or multipoint architecture as long as the total system capacitance remains below 3000 pF.
- What are some common applications of the P82B715DG4?
Common applications include HDMI DDC, long I2C communications, and industrial communications.
- Is the P82B715DG4 compatible with all logic signal drivers?
Yes, the P82B715DG4 is compatible with all logic signal drivers, including TTL.
