PCA9617ATPZ - Fm+ I2C Level Translating Repeater | NXP
料号： PCA9617ATPZ ✓ 量产中| 数量 | 单价 | 小计 |
|---|---|---|
| 1 | $0 | $0.00 |
| 10 | $0 | $0.00 |
| 100 | $0 | $0.00 |
| 500 | $0 | $0.00 |
| 1,000 | $0 | $0.00 |
PCA9617ATPZ 概述
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.
直接替换替代料： PCA9617ATPZ ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
快速对比工具——选择替代料号进行并排对比：
PCA9617ADPJ
✅ 直接替换📋 参考替代料（不在目录中）
PCA9617ATPZ
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联系询价
查看数据手册 →PCA9617ATPZ 最大额定值与电气特性
| 功能 | 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 |
| 使能引脚 | Yes (EN, active-high) |
| 工作温度范围 | -40C to +85C |
| Maximum Operating Temperature | +85C |
| 封装 | 8-pin HWSON (2x3 mm), SMD |
| 安装类型 | Surface Mount |
| Technology | CMOS |
| RoHS 状态 | Compliant (Z suffix, lead-free per NXP ordering-code convention) |
| Datasheet | 24-page PDF per distributor listing |
PCA9617ATPZ 8-pin hwson (2x3 mm), smd 引脚配置指南
PCA9617ATPZ（8-pin hwson (2x3 mm), smd 封装）的引脚配置。 该数字 IC 包含 GPIO、通信接口（UART、SPI、I2C）和电源引脚。请参阅制造商数据手册以了解复用引脚功能和配置选项。对嵌入式系统设计和 PCB 布局至关重要。
暂无详细引脚数据： PCA9617ATPZ.
请参阅 数据手册 以查看完整引脚配置。
典型应用
PCA9617ATPZ 适用于 6 应用s: 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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
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.
推荐
推荐产品汇总
工程参考数据： PCA9617ATPZ ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | 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) |
关键差异点
- True Fm+ 1 MHz operation with active buffering （对比 PCA9306DCTR)
- Bus isolation via EN pin （对比 PCA9306DCTR)
- Sub-1 V low-side support （对比 TCA9517DR)
设计说明
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.
合规信息
Z suffix in NXP ordering code indicates lead-free/RoHS-compliant termination. REACH, halogen-free and conflict-minerals status not stated in provided data.
