PCA9617ATPZ - Fm+ I2C Level Translating Repeater | NXP
Référence : PCA9617ATPZ ✓ Actif| Qté | Prix unitaire | Total |
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| 1 | $0 | $0,00 |
| 10 | $0 | $0,00 |
| 100 | $0 | $0,00 |
| 500 | $0 | $0,00 |
| 1 000 | $0 | $0,00 |
PCA9617ATPZ Présentation
An I2C-bus repeater (also called a buffer or bus extender) is an interface IC that sits between a controller and peripheral segments of an I2C or SMBus serial bus. Its role in the system hierarchy is: I2C repeater -> I2C buffer -> serial interface IC -> interface IC -> integrated circuit. It divides capacitively loaded bus segments, extends total bus length, and translates between devices operating at different supply voltages while retaining all operating modes of the I2C-bus system.
Key features of the PCA9617A include support for Fast-mode Plus operation up to 1 MHz, which is backward compatible with Standard-mode (100 kHz) and Fast-mode (400 kHz) devices; a wide low-side supply range of 0.8 V to 5.5 V enabling translation from 1.0 V, 1.2 V, 1.8 V, 2.5 V and 3.3 V logic rails up to 2.2 V to 5.5 V rails; and an enable (EN) pin that isolates both sides when the bus is idle or during system power-up. The CMOS architecture provides bidirectional buffering for both SDA and SCL without direction-control pins.
Technically, the device uses open-drain MOSFET switches with rise-time accelerators on each side, so both bus segments are individually pulled up and capacitance is not summed across the repeater. Propagation delay is 76 ns, leaving ample timing margin at 1 MHz Fm+ rates. This makes the part suitable for bus segments with heavy capacitive loading that would otherwise violate I2C rise-time specifications.
Typical applications include level shifting between low-voltage microcontrollers and 3.3 V or 5 V sensor or EEPROM buses, extending I2C bus length in industrial control backplanes, and isolating heavily loaded SMBA/SMBus segments in server and telecom hardware.
Design consideration: because the repeater locks up under certain clock-stretching patterns, verify that your slave devices do not hold SCL low for longer than the repeater's support interval; consult the manufacturer datasheet application section before deploying with clock-stretching peripherals.
This page synthesizes distributor pricing, drop-in alternatives, and practical design notes not found in the manufacturer datasheet.
Alternatives de remplacement direct pour PCA9617ATPZ — même boîtier, compatible broche à broche. Les références à boîtier différent nécessitant une retouche du PCB sont exclues.
Outil de comparaison rapide — sélectionnez des références alternatives pour une comparaison côte à côte :
PCA9617ADPJ
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Voir la fiche technique →PCA9617ATPZ Valeurs maximales et caractéristiques électriques
| Fonction | Level translating Fm+ I2C-bus repeater |
| Number of Channels | 1 |
| Maximum Data Rate | 1 MHz (Fast-mode Plus, Fm+) |
| Low-Voltage Side Range (VCC1) | 0.8 V to 5.5 V |
| High-Voltage Side Range (VCC2) | 2.2 V to 5.5 V |
| Supply Voltage - Min | 0.8 V |
| Supply Voltage - Max | 5.5 V |
| Propagation Delay | 76 ns |
| Bus Compatibility | I2C-bus, SMBus |
| Broche d'activation | Yes (EN, active-high) |
| Plage de température de fonctionnement | -40C to +85C |
| Maximum Operating Temperature | +85C |
| Boîtier | 8-pin HWSON (2x3 mm), SMD |
| Type de montage | Surface Mount |
| Technology | CMOS |
| Statut RoHS | Compliant (Z suffix, lead-free per NXP ordering-code convention) |
| Datasheet | 24-page PDF per distributor listing |
Guide de configuration des broches du PCA9617ATPZ 8-pin hwson (2x3 mm), smd
Configuration des broches du PCA9617ATPZ (boîtier 8-pin hwson (2x3 mm), smd). Ce circuit intégré numérique comprend des GPIO, des interfaces de communication (UART, SPI, I2C) et des broches d'alimentation. Consultez la fiche technique du fabricant pour les fonctions alternatives des broches et les options de configuration. Indispensable pour la conception de systèmes embarqués et la conception de circuits imprimés.
Aucune donnée de brochage détaillée disponible pour PCA9617ATPZ.
Consultez la fiche technique pour la configuration complète des broches.
Applications typiques
PCA9617ATPZ convient pour 6 applications: Low-Voltage MCU to 3.3 V / 5 V Sensor Bus Level Shifting, I2C Bus Extension in Industrial Control Backplanes, SMBus Systems in Servers and Telecom Hardware, Battery-Powered and Portable Devices, Display and LED Driver Buses, Networking and Communication Equipment.
Low-Voltage MCU to 3.3 V / 5 V Sensor Bus Level Shifting
Modern microcontrollers and SoCs frequently run their I2C controllers at 1.0 V, 1.2 V or 1.8 V, while the majority of I2C sensors, EEPROMs and RTCs operate at 3.3 V or 5 V. The PCA9617ATPZ fits this application precisely because its low side accepts 0.8 V to 5.5 V and its high side accepts 2.2 V to 5.5 V, covering every common rail combination. In use, VCC1 connects to the MCU rail and VCC2 to the peripheral rail; the repeater's rise-time accelerators actively drive both segments, so a 1.8 V MCU can communicate with 5 V sensors at 400 kHz to 1 MHz Fm+ rates. The 76 ns propagation delay is negligible even at 1 MHz. Unlike a passive MOSFET translator, active buffering keeps rise times within I2C specification even with ten or more peripherals on the high-side segment.
Recommandé
I2C Bus Extension in Industrial Control Backplanes
Industrial backplanes routinely violate the I2C-bus 400 pF capacitance limit because dozens of card slots, connectors and cable stubs load the SDA and SCL lines. The PCA9617ATPZ addresses this by partitioning the bus into isolated segments: each HWSON-8 repeater contributes only a few pF of loading to its local segment while regenerating full drive on the far side. At 1 MHz Fm+ speed with a 76 ns propagation delay, timing margin remains comfortable even with two repeaters in series. The EN pin allows a backplane controller to isolate a segment during hot-swap insertion or when a card faults, preventing a stuck bus from locking the whole system. Designers typically place one repeater per card cage segment, with local 2.2 kOhm to 4.7 kOhm pull-ups sized per segment capacitance.
Recommandé
SMBus Systems in Servers and Telecom Hardware
Server platforms use SMBus (PMBus) extensively for power-supply telemetry, fan controllers and DIMM management, and these buses span multiple boards and voltage domains. The PCA9617ATPZ is SMBus compatible and provides the capacitive partitioning these long buses need. Its 0.8 V low-side capability lets 1.x V management ASICs interface to a 3.3 V SMBus backbone, while the high side tolerates up to 5.5 V for legacy 5 V subsystems. The EN pin supports power-sequenced isolation: holding EN low tri-states both segments so a hot-inserted blade does not glitch the shared management bus during its power ramp. At up to 1 MHz operation, the repeater also supports Fm+ speed grades used by newer PMBus 1.3+ devices.
Recommandé
Battery-Powered and Portable Devices
Portable and battery-operated products combine fuel gauges, chargers and sensors across several voltage rails generated from a single cell. The PCA9617ATPZ suits this environment because its CMOS technology minimizes static supply current and its 0.8 V minimum low-side supply allows direct connection to sub-1 V core rails of ultra-low-power MCUs. The exposed-pad HWSON-8 (2x3 mm) package keeps board area to roughly 6 mm squared including pads, important for compact wearables and IoT sensor nodes. Active buffering means designers can use higher-value pull-up resistors on the low side, reducing standby leakage, while rise-time accelerators still meet 400 kHz Fast-mode rise-time requirements. Typical placement is between a 1.8 V sensor island and a 3.3 V peripheral rail on the same I2C net.
Recommandé
Display and LED Driver Buses
LED display drivers and LED controllers from NXP's PCA9xxx family are traditionally commanded over I2C buses that run from 2.5 V to 5 V, while the host controller may operate at 1.8 V. The PCA9617ATPZ bridges this gap while also isolating the capacitive load of long LED-matrix wiring from the controller segment. The repeater's bidirectional buffering preserves the ACK and clock-stretching behavior that PCA9xxx drivers rely on during PWM-frame synchronization, and its 1 MHz Fm+ support allows high refresh-rate update of large RGB matrices. Placing the repeater close to the controller and regenerating the bus at the display driver cluster keeps signal edges clean across cabling. The EN pin can blank the bus during LED power-ramp to prevent spurious commands from the drivers' brown-out behavior.
Recommandé
Networking and Communication Equipment
Routers, switches and optical modules use I2C for SFP/QSFP module management, fan controllers and power-monitoring ICs, with buses traversing multiple connectors and rails. The PCA9617ATPZ's level translation between a 1.8 V or 2.5 V management ASIC and a 3.3 V module-management bus (SFF-8472 defined 2.5 V to 3.6 V operation fits within the 2.2 V to 5.5 V high-side range) makes it a natural fit at each module cage. The 76 ns propagation delay is inconsequential at 100 kHz to 400 kHz management speeds. Because each SFP cage contributes significant capacitance through its connector, placing a repeater per cage partitions capacitance and guarantees rise-time compliance. The EN pin supports per-cage isolation so a failed module cannot hang the shared management bus.
Recommandé
Récapitulatif des produits recommandés
Données de référence d'ingénierie pour PCA9617ATPZ — comparaison, recommandations de conception et informations de conformité.
Guide de sélection
Comparaison avec les alternatives
| Paramètre | Ce produit | PCA9617ADPJ | PCA9617ATPZ (Nexperia) |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | Nexperia |
| Package | 8-pin HWSON (2x3 mm) | 8-pin HWSON (2x3 mm) - same | 8-pin HWSON (2x3 mm) - same |
| Function | Level translating Fm+ I2C repeater | Level translating Fm+ I2C repeater | Level translating Fm+ I2C repeater |
| Maximum Data Rate | 1 MHz (Fm+) | 1 MHz (Fm+) | 1 MHz (Fm+) |
| Low Side Voltage Range | 0.8 V to 5.5 V | 0.8 V to 5.5 V | 0.8 V to 5.5 V |
| Propagation Delay | 76 ns | 76 ns | 76 ns |
| RoHS / Lead-Free | Compliant (Z suffix) | Compliant (Z suffix) | Compliant (Z suffix) |
Principaux différenciateurs
- True Fm+ 1 MHz operation with active buffering (vs PCA9306DCTR)
- Bus isolation via EN pin (vs PCA9306DCTR)
- Sub-1 V low-side support (vs TCA9517DR)
Notes de conception
The HWSON-8 (2x3 mm) package has a large exposed die pad on the underside that must be soldered to a ground copper pour for reliable grounding and heat dissipation. Add an array of 3-4 via-in-pad connections to the internal ground plane. Place the repeater close to the connector or bus segment origin it is protecting, and keep SDA/SCL stubs short. Each segment needs its own pull-up resistors - typically 2.2 kOhm to 4.7 kOhm on the high side and 4.7 kOhm to 10 kOhm on the low side, sized to segment capacitance.
VCC1 and VCC2 each require local 100 nF ceramic decoupling capacitors placed within 2 mm of the supply pins. Note that VCC2 must always be within 2.2 V to 5.5 V and VCC1 within 0.8 V to 5.5 V; VCC1 must not exceed VCC2 + the absolute maximum rating defined in the datasheet. The EN pin should be driven by a supervisor or GPIO so both bus segments are isolated until all rails are stable - this prevents false bus start-up during multi-rail power sequencing.
Like all rise-time-accelerated I2C repeaters, the PCA9617A can latch into a lockup state if a slave stretches the clock beyond the interval the repeater's accelerator logic expects. Verify clock-stretching behavior of all slave devices against the manufacturer datasheet application section. Also remember the 76 ns propagation delay is additive when cascading multiple repeaters - budget total bus delay at your target data rate. Do not use the non-Z 'T' suffix part in RoHS-mandated builds.
Informations de conformité
Z suffix in NXP ordering code indicates lead-free/RoHS-compliant termination. REACH, halogen-free and conflict-minerals status not stated in provided data.
