Overview
The P82B715DR, produced by Texas Instruments, is a specialized IC designed to extend the capabilities of I2C bus systems. This device buffers both the serial data (SDA) and serial clock (SCL) signals, allowing for the extension of the I2C bus while retaining all the operating modes and features of the I2C system. It is particularly useful in applications where the I2C bus needs to span longer distances or handle higher capacitance loads.
The P82B715DR operates within a power-supply voltage range of 3 V to 12 V, making it versatile for various system configurations. It supports bidirectional data transfer and can handle bus capacitance of up to 400 pF on the main I2C bus and 3000 pF on the transmission side, significantly enhancing the practical communication distances.
Key Specifications
| Parameter | Description |
|---|---|
| Operating Power-Supply Voltage Range | 3 V to 12 V |
| Bus Capacitance | Up to 400 pF on main I2C bus (Sx/Sy side), up to 3000 pF on transmission side (Lx/Ly side) |
| Buffer Type | Dual Bidirectional Unity-Voltage-Gain Buffer |
| Bus Wiring Impedance | Drives 10× lower-impedance bus wiring for improved noise immunity |
| Clock Speed | Up to 100 kHz and 400 kHz when other system delays permit |
| ESD Protection | Exceeds 2500-V Human-Body Model (A114-A), 400-V Machine Model (A115-A), and 1000-V Charged-Device Model (C101) |
| Latch-up Performance | Exceeds 100 mA per JESD 78, Class II |
| Operating Temperature Range | -40°C to 85°C |
| Package Type | SOIC (8 pins), PDIP (8 pins) |
Key Features
- Supports bidirectional data transfer of I2C bus signals.
- Allows for multi-drop distribution of I2C signals using low-cost twisted-pair cables.
- Enables I2C bus operation over 50 meters of twisted-pair wire.
- Provides current amplification to drive low-impedance bus wiring, improving noise immunity.
- Internal diodes for ESD protection and logic signal swing limitation.
- No external directional control required for the buffer.
- Compatible with all logic signal drivers, including TTL.
Applications
- HDMI DDC (Display Data Channel) applications.
- Long I2C communications in various systems.
- Industrial communications where extended bus lengths are necessary.
- Analog radial IPMB (Intelligent Platform Management Bus) shelf applications.
Q & A
- What is the operating power-supply voltage range of the P82B715DR?
The operating power-supply voltage range is from 3 V to 12 V.
- How much bus capacitance can the P82B715DR handle?
It can handle up to 400 pF on the main I2C bus and up to 3000 pF on the transmission side.
- What is the maximum clock speed supported by the P82B715DR?
It supports clock speeds up to 100 kHz and 400 kHz when other system delays permit.
- What kind of ESD protection does the P82B715DR offer?
It exceeds 2500-V Human-Body Model (A114-A), 400-V Machine Model (A115-A), and 1000-V Charged-Device Model (C101).
- How does the P82B715DR improve noise immunity?
It drives 10× lower-impedance bus wiring, which improves noise immunity.
- Can the P82B715DR be used in multi-drop configurations?
Yes, it supports multi-drop distribution of I2C signals using low-cost twisted-pair cables.
- What is the maximum distance over which the P82B715DR can extend I2C bus signals?
It can extend I2C bus signals over approximately 50 meters of twisted-pair wire.
- Is the P82B715DR compatible with TTL logic signal drivers?
Yes, it is fully compatible with all logic signal drivers, including TTL.
- What is the operating temperature range of the P82B715DR?
The operating temperature range is from -40°C to 85°C.
- What package types are available for the P82B715DR?
It is available in SOIC (8 pins) and PDIP (8 pins) packages.
