PCA9517DG4 - 2-Channel 400kHz I2C Level Translator | Texas Instruments
MPN: PCA9517DG4 ✓ सक्रियPCA9517DG4 अवलोकन
An I2C level translator, also called a voltage-level translator, is an interface IC placed between two bidirectional open-drain buses. The PCA9517 belongs to the I2C buffer/repeater hierarchy, where it combines bidirectional buffering, voltage-level translation, and bus-segmentation functions. Its two-channel architecture allows SDA and SCL to cross independently between a low-voltage domain and a higher-voltage domain while preserving I2C clock stretching and SMBus-compatible operation.
Key features include two bidirectional channels, operation from 0.9 V on the low side to 5.5 V on the high side, a maximum I2C bus speed of 400 kHz, and compatibility with both I2C and SMBus systems. The buffered channels can extend usable bus reach by isolating capacitance accumulated on the source side from the destination side. A quoted propagation delay of 170 ns and input capacitance of 6 pF are important when selecting pull-up resistors and evaluating timing margins.
The PCA9517 uses bidirectional buffers rather than unidirectional voltage-level shifters. Because I2C and SMBus signals are open-drain and pulled up externally, each translated channel can conduct in either direction. This makes the device suitable for a host controller operating at a lower voltage communicating with sensors, memory devices, or expansion components whose pull-up network uses a higher supply voltage. The manufacturer describes the PCA9517 as a CMOS and BiCMOS integrated circuit for these applications.
Typical uses include voltage adaptation between 1.8 V, 2.5 V, 3.3 V, and 5 V logic domains; isolating a long or heavily loaded I2C branch; and extending communication between a microcontroller and higher-voltage sensors or EEPROMs. Because both SDA and SCL require translation, the complete two-channel arrangement keeps data and clock voltage domains aligned.
Designers must provide correct pull-up resistors on each side of the translator and account for the 170 ns propagation delay when calculating the maximum operating frequency. The 8-SOIC package is also used by the PCA9515A, while Texas Instruments' TCA9517 is identified as a comparable dual bidirectional I2C buffer. Review device-specific enable behavior, bus capacitance, and logic thresholds before finalizing a replacement.
This page organizes the PCA9517DG4 specifications, replacement candidates, application guidance, and design considerations into one engineering-focused reference. It also distinguishes the published 0.9 V low-side capability from the 2.7 V to 5.5 V high-side range and identifies package and functional differences that matter when reusing an existing PCB.
के लिए ड्रॉप-इन विकल्प PCA9517DG4 — समान पैकेज, पिन-टू-पिन संगत। PCB रीवर्क आवश्यक करने वाले भिन्न-पैकेज पार्ट्स शामिल नहीं हैं।
इस सीरीज़ के वेरिएंट
समान श्रृंखला के मॉडल जो ड्रॉप-इन संगत हैं PCA9517DG4 (समान फॉर्म फैक्टर और फुटप्रिंट) — इसमें भिन्न Package, Function, Number of Channels, RoHS Status.
TCA9517DR
✅ ड्रॉप-इनकीमत के लिए संपर्क करें
डेटाशीट देखें →PCA9515ADR
✅ ड्रॉप-इनकीमत के लिए संपर्क करें
डेटाशीट देखें →PCA9517DG4 विशेषताएं
| Channel Count | 2 channels |
| Bus Compatibility | I2C bus and SMBus |
| Maximum I2C Bus Frequency | 400 kHz |
| Low-Side Minimum Supply Voltage | 0.9 V |
| High-Side Supply Voltage Range | 2.7 V to 5.5 V |
| Overall Supply Voltage Range | 2.7 V to 5.5 V |
| Buffer Direction | Bidirectional |
| Delay Time | 170 ns |
| इनपुट कैपेसिटेंस | 6 pF |
| सप्लाई करंट | 5 mA |
| Device Type | Level-translating I2C bus repeater |
| Logic Type | I2C logic |
| Integrated Circuit Technology | CMOS and BiCMOS |
| पैकेज | 8-SOIC (0.154 inch, 3.90 mm width) |
| माउंटिंग प्रकार | Surface mount |
PCA9517DG4 8-soic (0.154 inch, 3.90 mm width) पिन कॉन्फ़िगरेशन गाइड
PCA9517DG4 (8-soic (0.154 inch, 3.90 mm width) पैकेज) के लिए पिन कॉन्फ़िगरेशन। पिन नंबरिंग, फ़ंक्शन और कनेक्शन आरेख निर्माता डेटाशीट में परिभाषित हैं। सटीक फुटप्रिंट और सोल्डरिंग दिशानिर्देशों के लिए इसे देखें।
इसके लिए कोई विस्तृत pinout data उपलब्ध नहीं: PCA9517DG4.
देखें डेटाशीट पूर्ण पिन कॉन्फ़िगरेशन के लिए।
सामान्य अनुप्रयोग
PCA9517DG4 के लिए उपयुक्त है 6 अनुप्रयोगs: Low-Voltage Controller to 5 V Peripheral Bus, I2C Bus Extension, SMBus Voltage Adaptation, Mixed-Voltage Sensor Interface, EEPROM and Memory Bus Isolation, Multi-Domain Control Module.
Low-Voltage Controller to 5 V Peripheral Bus
The PCA9517DG4 fits between a low-voltage controller and a 3.3 V or 5 V I2C peripheral bus when the two sides cannot share one pull-up voltage. Its low-side operation extends down to 0.9 V, while the high side accepts 2.7 V to 5.5 V, allowing SDA and SCL to cross voltage domains without unidirectional level shifters. The two bidirectional channels preserve clock stretching and SMBus-compatible behavior. Keep pull-up networks separate on each side, account for the quoted 170 ns delay, and verify the attached peripheral's absolute voltage limits.
अनुशंसित
I2C Bus Extension
Use the PCA9517DG4 as a repeatable boundary on an I2C segment whose accumulated capacitance would otherwise burden the controller or remote devices. Its bidirectional SDA and SCL buffers separate the source and destination bus sections, while the 400-kHz operating capability supports Fast-mode I2C communication. The quoted 6 pF input capacitance must be included when sizing pull-up resistors and estimating loading. Separate external pull-ups should establish valid logic levels in each voltage domain, and system timing must include the 170 ns propagation delay.
अनुशंसित
SMBus Voltage Adaptation
The PCA9517DG4 is appropriate for SMBus-compatible systems where a manager operates at one logic voltage and slave devices use another. Because the PCA9517 is an I2C/SMBus level-translating repeater, both SDA and SCL can be translated bidirectionally while retaining clock stretching. The 400-kHz limit defines the highest supported bus rate, and the 0.9 V low-side capability provides additional headroom for low-voltage managers. Confirm each side's pull-up voltage and the slave's allowable input range before deployment.
अनुशंसित
Mixed-Voltage Sensor Interface
The PCA9517DG4 can connect a low-voltage embedded controller to sensors, converters, or other instrumentation using a higher I2C pull-up voltage. Translating SDA and SCL together prevents the clock from remaining at one logic level while data crosses into another. Its 2.7 V to 5.5 V high-side range supports common 3.3 V and 5 V buses, while the low side can extend down to 0.9 V. Review sensor power sequencing, bus capacitance, and the translator's 170 ns delay when the sensor also imposes a clock-stretching limit.
अनुशंसित
EEPROM and Memory Bus Isolation
Placing the PCA9517DG4 between a controller and an I2C EEPROM or memory device can isolate the memory bus from capacitance on the controller-side segment. The buffered SDA and SCL paths maintain bidirectional communication, while separate pull-up networks let the EEPROM operate from 3.3 V or 5 V even when the controller uses a lower voltage. The device's 400-kHz capability covers common memory interfaces, but address setup, hold, and access timing still depend on the memory device. Validate timing with the 170 ns translator delay included.
अनुशंसित
Multi-Domain Control Module
The PCA9517DG4 is useful in a control module that combines a low-voltage processor rail with higher-voltage communications or expansion logic. Its two independent bidirectional channels translate both I2C clock and data, allowing the higher-voltage section to retain a conventional pull-up arrangement. This arrangement reduces the need for a processor pin to tolerate a higher bus voltage. Designers should confirm enable or power-sequencing requirements, use the manufacturer application circuit as a starting point, and preserve adequate timing margin around the 400-kHz operating ceiling.
अनुशंसित
अनुशंसित उत्पादों का सारांश
के लिए इंजीनियरिंग संदर्भ डेटा PCA9517DG4 — तुलना, डिज़ाइन मार्गदर्शन और अनुपालन जानकारी।
चयन गाइड
विकल्पों के साथ तुलना
| पैरामीटर | यह उत्पाद | TCA9517DR | PCA9515ADR |
|---|---|---|---|
| Package | 8-SOIC (0.154 inch, 3.90 mm width) | 8-SOIC | 8-SOIC |
| Brand | Texas Instruments | Texas Instruments | Texas Instruments |
| Channel Count | 2 channels | 2 channels | 2 channels |
| Buffer Direction | Bidirectional | Bidirectional | Bidirectional |
| Bus Compatibility | I2C bus and SMBus | I2C bus | I2C bus |
मुख्य विशेषताएँ
- Lower low-side operating capability (बनामTCA9517DR)
- Two complete bidirectional I2C channels (बनामTCA9517DR)
- SMBus-compatible level translation (बनामPCA9515ADR)
- SOIC footprint reuse (बनामPCA9515ADR)
डिज़ाइन नोट्स
Use separate pull-up networks for SDA and SCL on each side of the translator. Connecting both voltage domains to one pull-up supply defeats the level-shifting function and can expose the low-voltage devices to excessive voltage. Select resistor values from the capacitance of each isolated bus section and the required rise time. Because the PCA9517DG4 uses open-drain-compatible bidirectional buffering, each side must retain a valid passive pull-up.
Include the quoted 170 ns propagation delay when evaluating SCL timing, especially at the 400-kHz maximum rate. Calculate worst-case rise time from each bus section's total capacitance and pull-up resistance, and check clock-stretching behavior separately because the remote device may hold SCL low. Treat the translator as two independently loaded channels rather than assuming the source-side capacitance is completely hidden from the destination.
Place the PCA9517DG4 close to the boundary between low-voltage and high-voltage bus sections. Keep SDA and SCL routing lengths and topology similar to minimize propagation-time and capacitance differences between the two translated channels. Provide a solid ground reference, avoid long stubs into unused connectors, and place pull-up resistors near the devices that establish each domain's logic level. Follow the manufacturer recommended application circuit when reproducing the 8-SOIC footprint.
Confirm that both voltage domains can be powered in the sequence required by the attached controller and peripherals. The PCA9517DG4 supports low-side voltages down to 0.9 V and high-side voltages from 2.7 V to 5.5 V, but power-ramp behavior can affect bus logic if either side becomes active before its pull-up network is valid. Use the device enable or power-sequencing arrangement specified by the manufacturer for the selected system configuration.
अनुपालन जानकारी
The verified product and distributor listings do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status.