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P82B715
Datasheet
General description
The P82B715 is a bipolar IC intended for application in I2C bus systems. While retaining all the operating modes and features of the I2C system it permits extension of the practical separation distance between components on the I2C bus by buffering both the data (SDA) and the clock (SCL) lines.
The I2C bus capacitance limit of 400 pF restricts practical communication distances to a few meters. Using one P82B715 at each end of a long cable (connecting Lx/Ly to Lx/Ly) reduces the cable loading capacitance on the I2C bus by a factor of 10 times and allows the total system capacitance load (all devices, connectors, traces and wires that are connected to the I2C bus) to be around 3000 pF. That means longer cables or lower cost general purpose wiring may be used to connect two separate I2C based systems without worrying about the special voltage levels associated with other I2C bus buffers. Multiple P82B715s can be connected together in a star or multi-point architecture by their Lx/Ly ports without limit as long as the total capacitance of the system remains less than about 3000 pF (400 pF or less when referenced to any Sx/Sy connection). In that arrangement the master and/or slave devices are attached to the Sx/Sy port of each P82B715. The P82B715 alone does not support voltage level translation but it simplifies the application of low cost transistors for this purpose. There is no restriction on interconnecting the Sx/Sy I/Os and those I/Os are also fully compatible with bus buffers that use voltage level offsets (i.e., PCA9511, PCA9515, Sx/Sy side of P82B96) because it duplicates and transmits the offset voltage.
Features
- Dual, bi-directional, unity voltage gain buffer with no external directional control required.
- I2C Bus compatible
- Logic signal levels may include (but not exceed) both supply and ground
- Logic signal input voltage levels are output without change and are independent of VCC
- X10 impedance transformation, but does not change logic voltage levels.
- Supply voltage range 3 V to 12 V
- Clock speeds to at least 100 kHz and 400 kHz when other system delays permit
- ESD protection exceeds 2500 V HBM per Mil. Std 883C-3015.7 and 400 V MM per JESD22-A115. (I/Os have diodes to VCC and GND)
- Latch-up free (bipolar process with no latching structures)
Products/packages
| Type number | North American Type number | Ordering code (12NC) | Product status | Package | Packing | Marking | Chemical content | Leadfree conversion date |
|---|---|---|---|---|---|---|---|---|
| P82B715PN | P82B715PN | 9351 542 20112 | Volume production | SOT97-1
(DIP8) | Tube | Standard Marking | P82B715PN
| week 36, 2003 |
| P82B715TD | P82B715TD | 9351 547 70112 | Volume production | SOT96-1
(SO8) | Tube | Standard Marking | P82B715TD
| week 17, 2005 |
| P82B715TD | P82B715TD-T | 9351 547 70118 | Volume production | SOT96-1
(SO8) | Tape reel smd | Standard Marking | P82B715TD
| week 17, 2005 |
Pricing/ordering/availability
| Type number | Ordering code(12NC) | Indicative price/unit($) | Region | Distributor | In stock | Inventory date | Buy online | Samples |
|---|---|---|---|---|---|---|---|---|
| P82B715PN | 9351 542 20112 | 2.5700 | NA | ARROW ELECTRONICS | 3,345 | 5/29/2008 | Buy online | Order samples |
| NA | MOUSER ELECTRONICS | 1,744 | 5/29/2008 | Buy online | ||||
| NA | DIGI-KEY CORPORATION | 1,087 | 5/29/2008 | Buy online | ||||
| NA | FUTURE ELECTRONICS | 195 | 5/29/2008 | Buy online | ||||
| P82B715TD | 9351 547 70112 | 2.4800 | NA | ARROW ELECTRONICS | 2,912 | 5/29/2008 | Buy online | not available |
| NA | DIGI-KEY CORPORATION | 2,000 | 5/29/2008 | Buy online | ||||
| NA | MOUSER ELECTRONICS | 1,598 | 5/29/2008 | Buy online | ||||
| P82B715TD | 9351 547 70118 | 2.4800 | NA | ARROW ELECTRONICS | 17,500 | 5/29/2008 | Buy online | Order samples |
| NA | DIGI-KEY CORPORATION | 5,000 | 5/29/2008 | Buy online | ||||
| NA | FUTURE ELECTRONICS | 1,500 | 5/29/2008 | Buy online | ||||
| NA | DIGI-KEY CORPORATION | 755 | 5/29/2008 | Buy online |
Applications
- Increase the total connected capacitance of an I2C system to around 3000 pF (see AN255 appendix 2)
- Drive I2C signals over long cables to approximately 50 meters or 3000 pF
- When used in pairs allows, for example, 200 pF on each Sx/Sy I/O plus 2000 pF on the linked Lx/Ly I/Os
- Drives x10 lower impedance bus wiring for improved noise immunity
- Multi-drop distribution of I2C signals using low cost twisted-pair cables
Related applications
LCD display - discretes focus
PDA - discretes focus
Motherboard components
50-60 Hz CRT integrated DTV (TV210D)
Mid-range integrated DTV (TV810)
Intelligent washing machine
Transceiver board
Power amplifier board
Main CPU board
LCD TV - MMS functionality
Technical documents
Application Notes
AN444;
P82B715 I2C extender on long cables (01-Jun-93)
Support Documents
75013239;
I 2 C Logic Selection Guide (2005-01-12)
75011212;
I2C 2002-1A Evaluation Board Kit (01-Mar-03)
75012744;
I2C Bus Solutions 2004 (2004-02-01)
philips_i2c_handbook;
I2C Handbook (2004-01-01)
UM10204_3;
I2C-bus specification and user manual (26-Jun-07)
philips_i2c_logic_overview;
Interface Products Business Line Specialty Logic Product Line I2C Logic Family Overview (2004-01-01)
75009151;
P82B715 Bus Ext. Chip (2001-12-01)
notes_82b96;
Philips I2C bus, extending its reach (2001-05-01)
Parametrics/similar products
| Type number | Package | Operating temp.(Cel) | I²C-bus(kHz) | Operating voltage(VDC) | Inputs | Outputs |
|---|---|---|---|---|---|---|
| P82B715PN | SOT97-1
(DIP8) | -40~85 | 100 | 4.5~12.0 | 1 | 1 |
| P82B715TD | SOT96-1
(SO8) | -40~85 | 100 | 4.5~12.0 | 1 | 1 |
Similar products
P82B715 links to the similar products page containing an overview of products that are similar in function or related to the type number(s) as listed on this page. The similar products page includes products from the same catalog tree(s), relevant selection guides and products from the same functional category.
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