PCA9517D - 2-Channel 400kHz I2C Level Translator | Texas Instruments
Артикул: PCA9517D ✓ Активен| Кол-во | Цена за ед. | Итого |
|---|---|---|
| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1.000 | $0 | $0,00 |
PCA9517D Обзор
What is a level-translating I2C buffer/repeater? It is an interface IC that connects two bidirectional serial buses operating at different voltage levels. The PCA9517D belongs to the I2C repeater and voltage-level-translator hierarchy, within interface ICs and semiconductors. Its two channels isolate bus voltage domains while preserving bidirectional data transfer, helping systems separate voltage levels without redesigning the upstream and downstream devices.
Key verified features include two bidirectional channels, 400kHz operation, and compatibility with I2C and SMBus applications. The device can translate signals between low-voltage domains, including voltages down to 0.9V in the NXP-described PCA9517 function, and higher-voltage domains from 2.7V to 5.5V. The 8-SOIC package supports conventional surface-mount assembly and is identified by Texas Instruments as a two-channel signal buffer/repeater.
The PCA9517D is useful when two I2C domains require different voltage ranges or when a bus segment needs buffering. Its two independent enables allow unused channels to be disabled, while the bidirectional architecture supports data flow in either direction. The verified distributor listing specifies 400kHz operation and an 8-SOIC package; detailed electrical limits should be confirmed against the manufacturer datasheet before production release.
Typical applications include voltage-level translation between low-voltage sensors and higher-voltage controllers, SMBus isolation between subsystems, interface conditioning between PCB domains, and embedded systems where I2C devices use different supply rails. Because it is a repeater rather than a regulator, system designers must verify pull-up voltage, bus capacitance, propagation delay, and enable sequencing on each side.
A key design consideration is that both sides of each channel must be properly referenced and pulled up for the voltage domains being supported. Do not assume that level translation removes the need for correct pull-up placement or timing review. Confirm the exact pinout, enable polarity, maximum loading, and operating limits from the official Texas Instruments documentation.
This page combines verified distributor information, manufacturer product identity, interface-function context, package information, and practical selection guidance to support engineers searching for a PCA9517D replacement, equivalent, pinout, price, or I2C level-translation solution.
Аналоги без доработки для PCA9517D — 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 PCA9517D (тот же форм-фактор и посадочное место) — отличается по Number of Channels, Package, Function, Maximum Data Rate, RoHS Status.
Инструмент быстрого сравнения — выберите альтернативные компоненты для сравнения бок о бок:
PCA9517D,118
✅ Прямая замена📋 Справочный аналог (нет в каталоге)
PCA9517ADMR2G
✅ Прямая замена✓ В наличии
$0.62 / шт.
Открыть даташит →PCA9517D Характеристики
| Product Type | 2-channel bidirectional I2C/SMBus buffer/repeater |
| Number of Channels | 2 |
| Maximum I2C Bus Frequency | 400 kHz |
| Supply Voltage Range | 2.7 V to 5.5 V |
| Low-Voltage Domain Support | Down to 0.9 V |
| Higher-Voltage Domain Support | 2.7 V to 5.5 V |
| Bus Compatibility | I2C and SMBus |
| Directional Architecture | Bidirectional |
| Корпус | 8-SOIC |
| Тип монтажа | Surface Mount |
| Ток потребления | 5 mA |
| Delay Time | 170 ns |
| Входная ёмкость | 6 pF |
| Enable Control | Two-side enable control |
| Logic Level Translation | Voltage-level translation between bus domains |
| Interface Classification | Signal buffer and repeater |
| Manufacturer | Texas Instruments |
Руководство по цоколевке PCA9517D в корпусе 8-soic
Цоколевка для PCA9517D (корпус 8-soic). 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 PCA9517D.
Обратитесь к даташиту для полной конфигурации выводов.
Типичное применение
PCA9517D подходит для 6 применениеs: Low-Voltage Sensor I2C Interface, SMBus Voltage-Domain Translation, Embedded Controller Bus Conditioning, Multi-Rail Sensor Network, PCB Bus-Segment Buffering, Level Translation Between 1.8V and 5V Domains.
Low-Voltage Sensor I2C Interface
The PCA9517D fits when a 1.8V or other low-voltage sensor must communicate with a controller operating from a different supply domain. Its bidirectional two-channel architecture can translate both clock and data paths while preserving I2C behavior up to 400kHz. Place the appropriate pull-up resistors on each voltage domain and verify enable polarity, bus capacitance, and timing against the official datasheet. The trade-off is that the level translator adds propagation delay, so margin should be checked at the highest intended I2C rate.
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SMBus Voltage-Domain Translation
PCA9517D is suitable for separating SMBus devices operating at different supply voltages while retaining the bidirectional clock and data behavior described by Texas Instruments. Its verified 400kHz capability is appropriate for many low-speed management buses, but the design must confirm the exact voltage combination and timing margins. Keep pull-ups on the side they belong to, maintain the bus return path, and avoid using the repeater as a substitute for a power regulator or isolation barrier.
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Embedded Controller Bus Conditioning
In an embedded controller design, the PCA9517D can place a buffered, level-translated I2C segment between a microcontroller and another subsystem. The two enable inputs provide control opportunities for isolating unused channels, while the bidirectional channels support normal I2C clock and data flow. The 8-SOIC package is straightforward to route on a conventional PCB, although designers should still check ground continuity and pull-up placement. At 400kHz, capacitance and propagation-delay accumulation become more important than at lower bus rates.
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Multi-Rail Sensor Network
The PCA9517D can help connect I2C sensors on a low-voltage rail to a host on a higher-voltage rail, especially when the sensors and host cannot share the same reference. Its two-channel structure allows separate level domains to be buffered on one side and translated toward the other. Because this is a non-isolated interface IC, it does not provide galvanic isolation; common ground and voltage-domain planning remain mandatory. Verify enable states during reset and test each bus segment independently to prevent contention.
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PCB Bus-Segment Buffering
When long traces or segmented interconnects increase bus capacitance, the PCA9517D can be considered as a repeatable buffering point between I2C domains. The verified 400kHz rating provides a defined operating point, while the level-translation function allows the two sides to use different supply rails. Buffering does not eliminate the need for correct pull-up resistor sizing or topology review, and the device should not be assumed to correct excessive rise-time violations. Validate the complete bus with the worst-case cable, device loading, and pull-up network.
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Level Translation Between 1.8V and 5V Domains
The PCA9517D is a practical candidate for translating a 1.8V I2C segment toward a 5V domain when the system’s electrical limits and pull-up arrangement are confirmed from the manufacturer data. The supplied NXP documentation for the PCA9517 family describes low-voltage operation down to 0.9V and higher-voltage domains from 2.7V to 5.5V, which provides useful context but is not a substitute for the Texas Instruments PCA9517D datasheet. Check output levels, input thresholds, bus rise time, and reset behavior before release to production.
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Сводка рекомендуемых товаров
Справочные инженерные данные для PCA9517D — сравнение, рекомендации по проектированию и информация о соответствии.
Руководство по выбору
Сравнение с аналогами
| Параметр | Этот товар | PCA9517D,118 | PCA9517AD | PCA9517DGKR |
|---|---|---|---|---|
| Brand | Texas Instruments | NXP Semiconductors | NXP Semiconductors | Texas Instruments |
| Package | 8-SOIC | 8-SO - related listing; package equivalence requires verification | 8-SO - comparison result | MSOP-8 - not same package |
| Function | 2-channel bidirectional I2C/SMBus buffer/repeater | I2C bus repeater | I2C repeater | Voltage-level translator/repeater |
| Interface | I2C/SMBus | I2C bus repeater | I2C repeater | Translator/repeater |
| Price | Numeric price not supplied | Numeric price not supplied | Numeric price not supplied | Numeric price not supplied |
Ключевые отличия
- Two bidirectional channels in one device (против PCA9517AD)
- 400kHz verified operating point (против PCA9517D,118)
- Verified 8-SOIC package identification (против PCA9517DGKR)
Заметки по проектированию
Place the PCA9517D close to the separation point between the two I2C voltage domains. Keep each side’s pull-up network local to its own bus segment, connect both domain grounds to the common reference, and avoid routing the level-shifted side through long unprotected traces. The verified package is 8-SOIC, so follow the manufacturer land pattern rather than substituting a generic footprint.
Treat the verified 400kHz rating as a system limit to validate, not a guarantee for every bus. Check pull-up resistance against bus capacitance, rise and fall time, propagation delay, and the combined loading of attached devices. If cable length or capacitance is substantial, measure the far-end waveform and preserve margin below the device’s specified operating frequency.
Do not assume that the PCA9517D replaces pull-up resistors, provides galvanic isolation, or solves a missing ground connection. Confirm enable polarity and startup state, verify that unused channels are handled according to the official datasheet, and distinguish the Texas Instruments PCA9517D from similarly named NXP PCA9517D,118 and PCA9517AD listings before approving a substitution.
Информация о соответствии
The supplied verified data does not explicitly state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive qualification status. Compliance fields remain unknown rather than inferred.
