NTSX2102 - 2-Bit Open-Drain Level Translator | NXP | I2C
MPN： NTSX2102 ✓ 啟用中NTSX2102 概覽
A dual-supply translating transceiver is a class of level-shifter IC within the broader hierarchy of logic ICs and voltage translators. It bridges two independently powered domains - for example a 1.8V microcontroller and a 3.3V peripheral - by translating logic thresholds between a VCC(A) side and a VCC(B) side. Open-drain architectures are specifically suited to shared buses such as I2C and 1-wire, where lines are pulled high by external resistors and any device can drive them low, requiring no explicit direction control signal.
The NTSX2102's headline features are automatic direction sensing (no DIR pin required), an output enable input (OE) that tri-states both ports for bus isolation or power-down, and an open-drain output structure purpose-built for I2C, SMBus-style and 1-wire point-to-point links. Two 2-bit input/output port pairs (A1/A2 and B1/B2) provide the translation channels.
According to the NXP product data sheet, the device is targeted at point-to-point applications interfacing devices or systems operating at different supply voltages, using open-drain drivers. The auto-direction-sensing topology detects which side is driving and propagates the transition to the opposite side, eliminating firmware direction management. The 50 Mbit/s capability comfortably covers Standard, Fast and Fast-mode Plus I2C speeds as well as faster proprietary 2-wire links.
Typical applications include I2C bus level translation between 1.8V/3.3V domains, 1-wire EEPROM and authentication IC links, low-voltage sensor interfaces in portable and battery-powered systems, and general-purpose open-drain signaling where footprints of a few square millimeters matter.
Design consideration: open-drain translation requires external pull-up resistors on both sides; choose pull-up values that balance rise time (bus capacitance) against static current, and ensure the A-side supply is not below the device minimum - an NXP community thread notes operation starts from 1.65 V on the A-side, so 1.2 V domains need a different part.
This page synthesizes distributor listings, drop-in alternative analysis, and practical design notes not found in the manufacturer datasheet.
直接替換替代品，適用於 NTSX2102 — 相同封裝，腳位對腳位相容。需重新設計 PCB 的不同封裝零件不列入。
此產品無可直接替換的替代品。
申請替代品NTSX2102 最大額定值與電氣特性
| 功能 | Dual supply translating transceiver |
| Bit Width | 2 bit |
| 輸出類型 | Open-drain |
| Direction Control | Auto direction sensing |
| 資料速率 | 50 Mbit/s |
| 通道數 | 2 bidirectional channels (A1/A2 to B1/B2) |
| Output Enable | Yes (OE input) |
| Supply Pins | VCC(A) and VCC(B) dual supply |
| Targeted Buses | I2C, 1-wire (open-drain drivers) |
| A-Side Supply Minimum | 1.65 V (per NXP community clarification) |
| Package (GU8H) | 8-pin XQFN, 1.4 x 1.2 mm |
| 安裝類型 | Surface Mount |
NTSX2102 8-pin xqfn, 1.4 x 1.2 mm 腳位配置指南
NTSX2102（8-pin xqfn, 1.4 x 1.2 mm 封裝）的腳位配置。 此數位 IC 包含 GPIO、通訊介面（UART、SPI、I2C）與電源腳位。替代腳位功能與配置選項請參閱製造商資料表。對嵌入式系統設計與 PCB 佈局至關重要。
無詳細腳位定義資料： NTSX2102.
請參閱 資料表 以查看完整腳位配置。
典型應用
NTSX2102 適用於 6 應用s: I2C Bus Level Translation, 1-Wire Bus Interfacing, Point-to-Point Board Interconnect, Portable and Battery-Powered Devices, Sensor Interface Level Shifting, Industrial Control and Automation.
I2C Bus Level Translation
The NTSX2102's primary application is level-shifting an I2C bus between two voltage domains, for example a 1.8 V microcontroller (VCC(A) side) and a 3.3 V sensor or EEPROM (VCC(B) side). Its open-drain output structure mirrors the native I2C electrical convention: any device on either side can pull SDA/SCL low, and the auto-direction-sensing circuitry propagates the transition to the opposite domain without a DIR pin or firmware intervention. With a 50 Mbit/s capability, the device covers Standard, Fast and Fast-mode Plus I2C with wide margin; the practical speed limit is set by pull-up resistors and bus capacitance. External pull-ups to each side's rail are required, and the OE pin allows the translator to be tri-stated during power sequencing so an unpowered side does not clamp the bus.
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1-Wire Bus Interfacing
The NXP datasheet explicitly targets 1-wire buses using open-drain drivers, and the NTSX2102 is a natural fit for translating a 1-wire link between a low-voltage host and a higher-voltage peripheral such as an EEPROM, battery-identity IC or authentication device. The auto direction sensing handles the bidirectional time-slot signaling of 1-wire protocols: the host drives the line low for reset or write slots, and the slave answers by pulling the line low, with all transitions passing transparently through the translator. Because 1-wire is single-ended and open-drain, only one channel of the 2-bit device is consumed, leaving the second channel available for a companion 1-wire line or an auxiliary open-drain flag signal. External pull-up resistor sizing per the 1-wire specification governs achievable timing.
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Point-to-Point Board Interconnect
Beyond named bus standards, the NTSX2102 suits general point-to-point interconnection between devices or systems operating at different supply voltages, as stated in the NXP general description. Examples include connecting a 1.8 V GPIO, interrupt or enable line from an application processor to a 3.3 V power-management IC, or bridging a 5 V-tolerant peripheral to a low-voltage FPGA bank. The two independent channels (A1/A2 and B1/B2) allow two such signals to cross a domain boundary through one 1.4 x 1.2 mm XQFN-8 footprint. The open-drain topology means each line needs a pull-up to its local rail, and the 50 Mbit/s bandwidth supports fast edge signaling well above typical GPIO rates. The OE input supports safe power-down of either domain.
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Portable and Battery-Powered Devices
The 8-pin XQFN package of the NTSX2102GU8H measures only 1.4 x 1.2 mm, making the device attractive for smartphones, wearables, hearables and other battery-powered products where board area is the scarcest resource. Battery-powered systems routinely mix rails - a 1.8 V application processor, a 3.3 V fuel gauge or secure element, and a sensor at yet another voltage - and the NTSX2102's dual-supply, 2-bit architecture bridges one such boundary per package with automatic direction sensing that consumes no GPIO for direction control. The OE pin permits the translator to be disabled to eliminate leakage paths when a subsystem rail is powered down, supporting aggressive power gating. Its small die also contributes low added capacitance on the translated lines.
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Sensor Interface Level Shifting
Modern sensors ship in a range of supply voltages, and the NTSX2102 lets a low-voltage MCU talk to a sensor rail without violating either device's absolute maximum ratings. In a typical arrangement, VCC(A) tracks the microcontroller IO rail (for example 1.8 V) and VCC(B) tracks the sensor rail (for example 3.3 V); the I2C SDA/SCL pair or a 2-wire status/interrupt pair crosses the NTSX2102 in one package. Auto direction sensing is essential here because sensor interrupt lines can be driven from either side and I2C is inherently bidirectional. Designers should confirm the sensor-side rail stays within the NTSX2102's B-side supply range per the datasheet, keep pull-ups sized to the sensor bus capacitance, and use OE to isolate the sensor rail during system standby.
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Industrial Control and Automation
Industrial controllers frequently combine a low-voltage MCU core domain with 3.3 V or 5 V field-side signaling, and the NTSX2102 provides an orderly, dedicated crossing point for open-drain signals such as I2C-linked expansion ports, configuration interfaces, and 1-wire device identification (for example, board-serialization EEPROMs read by production test equipment). Its 50 Mbit/s headroom and 2-bit width let one device carry a full I2C pair, and its OE pin lets the controller isolate the field side while the backplane powers up - important in systems where a card is hot-inserted. The XQFN-8 footprint suits dense PLC I/O modules, and the open-drain structure tolerates multi-drop extensions on the B-side where the local bus protocol permits, provided total capacitance and pull-up strength are re-evaluated.
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推薦產品摘要
工程參考資料，適用於 NTSX2102 — 比較、設計指引及合規資訊。
選型指南
與替代品比較
| 參數 | 本產品 | NTSX2102TLH | NTSX2102GU8H |
|---|---|---|---|
| Brand | NXP Semiconductors | NXP Semiconductors | NXP Semiconductors |
| Bit Width | 2 bit | 2 bit | 2 bit |
| Output Type | Open-drain | Open-drain | Open-drain |
| Direction Control | Auto direction sensing | Auto direction sensing | Auto direction sensing |
| Data Rate | 50 Mbit/s | 50 Mbit/s | 50 Mbit/s |
| Output Enable (OE) | Yes | Yes | Yes |
| Targeted Buses | I2C, 1-wire (open-drain) | I2C, 1-wire (open-drain) | I2C, 1-wire (open-drain) |
| Drop-in on GU8H footprint | Reference | No - different package | Yes - same package |
主要差異化特點
- Dedicated open-drain I2C/1-wire architecture (對比NTSX2102TLH)
- Auto direction sensing with no DIR pin (對比NTSX2102TLH)
- Honest trade-off: 1.65 V minimum A-side supply (對比NTSX2102TLH)
設計說明
The NTSX2102GU8H uses an 8-pin XQFN land pattern of only 1.4 x 1.2 mm. Follow the NXP footprint recommendation exactly, including any center thermal/electrical pad specified in the datasheet layout section, and place the 100 nF decoupling capacitor for each supply pin (VCC(A) and VCC(B)) within 1-2 mm of the respective pin. Because both supplies are independent, each must be decoupled separately; do not share a single capacitor between sides. Route A-side and B-side traces on the same layer as the IC to avoid vias on such a fine-pitch pattern.
Open-drain translation performance is dominated by the external pull-up resistors, not the NTSX2102 itself. Estimate rise time as 0.8473 x R_pullup x C_bus (RC to 63%); for a 50 pF bus at Fast-mode Plus (1 Mbit/s), keep the pull-up near 1 kOhm to 1.5 kOhm on the loaded side. Larger pull-ups save current but stretch rise times and limit bus speed. Because the device is rated at 50 Mbit/s, the translator will rarely be the bottleneck for I2C; size pull-ups to the bus, verify with scope measurements on the highest-capacitance configuration.
Two frequent mistakes with this device class: (1) using it with an A-side rail below its minimum - NXP community discussion indicates the A-side operates from about 1.65 V, so a 1.2 V domain will not work; select a lower-voltage translator instead. (2) Mixing push-pull drivers onto open-drain lines - a push-pull high driver on either side will fight the opposite side's pull-down. Ensure every translated line is open-drain or has a series strategy, and hold OE low until both supply rails are valid during power sequencing so partially-powered ports do not clamp the bus.
合規資訊
Compliance data was not present in the retrieved web data. Verify RoHS/REACH status on the official NXP product page at nxp.com/products/NTSX2102 before procurement.
