P82B715PG4 - 400kHz I2C Bus Extender | Texas Instruments
Артикул: P82B715PG4 ✓ АктивенP82B715PG4 Обзор
An I2C bus extender is a specialized interface IC placed between two bus segments when passive capacitance, wiring distance, or loading prevents the original controller and slaves from communicating reliably. Its hierarchy is I2C/SMBus buffer or repeater, then bus extender, then interface IC, and finally semiconductor. The extender preserves the two-wire clock-and-data architecture while increasing the usable bus-wiring capacitance from the conventional 400 pF limitation toward a 3 nF limitation described by Texas Instruments.
The principal benefit is improved drive capability without changing the host bus protocol. The P82B715PG4 uses analog current amplification to strengthen the sink capability of the connected I2C chips. This makes it useful for separating a heavily loaded bus section, extending wiring to another module, or improving noise and signal-integrity margins when slow or high-capacitance rise times would otherwise make communication unreliable. Its two buffered bits support clock and data paths while retaining bidirectional communication.
The device operates across a 3 V to 12 V supply range and supports operation at up to 400 kHz. Texas Instruments describes it as an I2C bus extender for buffering highly capacitive I2C systems. Because the implementation is based on analog current amplification, the designer must observe the manufacturer’s bus rise-time, pull-up, grounding, and capacitance guidelines rather than treating the extender as permission to remove all timing margin.
Typical uses include industrial control modules, long sensor harnesses, rack-mounted equipment, test fixtures, and embedded systems where a remote sensor or actuator connects through a cable back to an I2C controller. The P82B715PG4 can be placed at a board boundary or near the remote device to limit the electrical length and capacitance seen by the upstream controller.
Layout remains critical. Place the extender close to the more heavily capacitive or remote bus section, provide a continuous ground reference, verify pull-up resistor values on both sides, and observe the datasheet limits for each segment. Confirm operation at the intended 100 kHz or 400 kHz rate under worst-case cable capacitance, temperature, and supply voltage rather than validating only at nominal conditions.
This page combines the verified Texas Instruments device description with procurement-oriented pricing fields, replacement guidance, interface design notes, and application-specific selection criteria. It is intended to help engineers determine whether the P82B715PG4 can solve an I2C capacitance or drive problem without unnecessarily redesigning the host controller and bus topology.
Аналоги без доработки для P82B715PG4 — тот же корпус, pin-to-pin совместимость. Компоненты в других корпусах, требующие переработки PCB, исключены.
Варианты в этой серии
Модели той же серии, совместимые без доработки с P82B715PG4 (тот же форм-фактор и посадочное место) — отличается по Package.
P82B715P
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Открыть даташит →P82B715PG4 Характеристики
| Product Type | 2-bit bidirectional I2C/SMBus buffer and cable extender |
| Bus Compatibility | I2C and SMBus |
| Number of Buffered Bits | 2 bits |
| Supply Voltage Range | 3 V to 12 V |
| Maximum Bus Frequency | 400 kHz |
| Bus Wiring Capacitance Limit | 3 nF |
| Conventional I2C Bus Wiring Capacitance Limit | 400 pF |
| Signal Transfer | Bidirectional |
| Drive Architecture | Unidirectional analog current amplification |
| Функция | Increases the current sink capability of connected I2C devices |
| Корпус | 8-pin PDIP |
| Тип монтажа | Through-hole |
| Channel Count | 2 |
| Product Category | Interface IC |
| Скорость передачи данных | Up to 400 kHz |
Руководство по цоколевке P82B715PG4 в корпусе 8-pin pdip
Цоколевка для P82B715PG4 (корпус 8-pin pdip). Нумерация выводов, функции и схемы подключения определены в техническом описании производителя. Обратитесь к нему для точного посадочного места и рекомендаций по пайке.
Нет подробных данных о распиновке для P82B715PG4.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
P82B715PG4 подходит для 6 применениеs: Industrial Sensor Cable Extension, Remote I2C Sensor Module, Test and Measurement Fixture, Rack-Mount Control Module, Embedded Equipment Boundary Buffer, Low-Voltage I2C Bus Isolation.
Industrial Sensor Cable Extension
The P82B715PG4 is well matched to industrial systems where an I2C controller communicates with remote sensors across a cable whose capacitance could slow the bus edges. Its unidirectional analog current amplification increases the effective sink capability of the connected devices, while the 3 V to 12 V operating range and 400 kHz bus rating support common embedded control architectures. Place the extender near the remote sensor section rather than at the controller, keep the ground path continuous, and verify the total segment capacitance against the manufacturer datasheet. The benefit is improved communication margin without changing the two-wire protocol, although actual performance still depends on cable construction, pull-up values, and the controller’s timing characteristics.
Рекомендуется
Remote I2C Sensor Module
A remote sensor module can present enough cable and input capacitance to prevent a central I2C controller from communicating cleanly at the intended rate. The P82B715PG4 is suitable for placing close to that module because its analog current amplification strengthens the sink current available to the bus and supports operation up to 400 kHz. Its bidirectional two-bit implementation carries both clock and data across the buffered interface. Designers should calculate the worst-case cable capacitance, select pull-up resistors for the available rise-time margin, and verify operation across the full 3 V to 12 V supply range. The extender helps isolate the controller electrically but does not remove the need for correct grounding, connector layout, and bus timing analysis.
Рекомендуется
Test and Measurement Fixture
In a test fixture, long interconnects and numerous adapters can add capacitance that degrades I2C edge timing. The P82B715PG4 provides an active boundary between the controller and the more capacitive fixture section, using analog current amplification to improve the connected devices’ sink capability. Operation up to 400 kHz makes it useful when the fixture requires the faster standard bus rate. Place the device near the fixture connector and provide a short ground reference to minimize additional loop area. Validate every supported fixture cable and adapter combination at worst-case capacitance and supply voltage. The key engineering benefit is stronger bus recovery with a familiar bidirectional two-wire interface, while the principal trade-off is the added device and associated design checks.
Рекомендуется
Rack-Mount Control Module
Rack-mounted control modules often distribute a small I2C or SMBus network across several cards and cable harnesses, increasing capacitance beyond what the host controller can drive reliably. The P82B715PG4 can buffer a heavily loaded card segment and supports a 3 V to 12 V supply with communication rates up to 400 kHz. Position the extender near the remote card or harness connection, maintain a common low-impedance ground, and observe the datasheet’s bus-wiring and capacitance guidance. Its bidirectional clock and data channels avoid a separate one-way communication protocol. Compared with a passive extender, active current amplification offers better edge recovery, but the system must still be checked for hot-plug, ground offset, connector, and bus contention risks not resolved by the device itself.
Рекомендуется
Embedded Equipment Boundary Buffer
The P82B715PG4 can divide an embedded equipment bus into a local controller segment and a higher-capacitance external segment. Texas Instruments specifies the part for buffering highly capacitive I2C systems through unidirectional analog current amplification, allowing the remote devices to recover signal edges more effectively. Its 400 kHz rating covers the faster standard I2C operating mode, while the 8-pin PDIP package supports through-hole assembly and prototype construction. In the layout, place the extender close to the external connector and provide local return-path continuity. Verify pull-up placement and loading on both bus sections, and test at the minimum supply voltage because reduced drive margin can affect rise time. The part is a bus-reach solution, not a substitute for correct signal-integrity engineering.
Рекомендуется
Low-Voltage I2C Bus Isolation
For a 3 V to 12 V system that must bridge a capacitively loaded I2C section, the P82B715PG4 offers a straightforward active buffering point while retaining bidirectional clock and data transfer. Its analog current amplification improves the effective sink capability of the connected I2C chips, which can be valuable when wiring or adapter boards raise the bus capacitance. The device supports rates through 400 kHz, so designers can test both 100 kHz and 400 kHz operation against the final cable and load. Place the extender adjacent to the noisier or longer cable section, route clock and data consistently, and verify ground offsets before relying on communication. Although the extender strengthens signaling, it does not provide isolation from ground potential differences or eliminate contention caused by incorrect bus connections.
Рекомендуется
Сводка рекомендуемых товаров
Справочные инженерные данные для P82B715PG4 — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Choose P82B715P when the same underlying device and PDIP format are needed under a different Texas Instruments ordering suffix, after confirming the current ordering table and package drawing. Do not treat P82B715D, P82B715DG4, or P82B96 as drop-in substitutes without checking their package and electrical specifications; the verified data does not establish them as pin-compatible with this target. If the existing bus already satisfies its capacitance and rise-time limits, a passive solution may be sufficient. If ground offsets or galvanic isolation are the primary issue, neither the P82B715PG4 nor P82B715P resolves that requirement by itself.
Сравнение с аналогами
| Параметр | Этот товар | P82B715P |
|---|---|---|
| Package | 8-pin PDIP | 8-pin PDIP |
| Brand | Texas Instruments | Texas Instruments |
| Product Type | I2C/SMBus buffer and cable extender | P82B715 I2C/SMBus buffer and cable extender |
| Number of Buffered Bits | 2 bits | 2 bits |
| Supply Voltage Range | 3 V to 12 V | 3 V to 12 V |
| Maximum Bus Frequency | 400 kHz | 400 kHz |
| Bus Wiring Capacitance Capability | Up to 3 nF | Up to 3 nF |
| Signal Direction | Bidirectional | Bidirectional |
| Drive Architecture | Unidirectional analog current amplification | Unidirectional analog current amplification |
Ключевые отличия
- Active analog current amplification (против P82B715P)
- High-capacitance bus support (против P82B715P)
- Bidirectional clock and data buffering (против P82B715P)
Заметки по проектированию
Place the P82B715PG4 at the boundary between the shorter controller segment and the more capacitive remote segment. Keep the SCL and SDA paths adjacent to their ground reference, minimize stub branches, and provide a direct return path between the extender and remote devices. The purpose of the placement is to prevent the host controller from driving the full cable capacitance directly while limiting the cable section seen by the buffered side.
Validate rise time and communication margin with the final cable, connectors, pull-up resistors, and peripheral loading rather than only on a short bench harness. The P82B715PG4 supports up to 400 kHz, but that rating does not guarantee 400 kHz operation in every physical implementation. Check both bus sections, use the manufacturer’s capacitance and timing guidance, and test at minimum supply voltage and maximum expected temperature.
Do not treat the active extender as galvanic isolation or as protection against ground offsets. Incorrect pull-up placement, excessive capacitive loading, bus contention, or an inadequately connected ground can still prevent reliable communication. Confirm that clock and data remain correctly oriented for bidirectional operation, check the 3 V to 12 V operating range, and avoid relying on distributor descriptions as a substitute for the current Texas Instruments datasheet.
Информация о соответствии
The supplied verified web data does not explicitly state compliance status. No compliance claim has been inferred.
