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NXP Semiconductors NVT4857UKZ
- Part No.:
- NVT4857UKZ
- Manufacturer:
- NXP Semiconductors
- Category:
- Specialized
- Package:
- 20-UFBGA, WLCSP
- Datasheet:
-
NVT4857UKZ.pdf
- Description:
- IC INTERFACE SPECIALIZED 20WLCSP
- Quantity:
- Payment:
- Shipping:
Inventory:4,190
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Product details
Overview
NVT4857UK from NXP Semiconductors is an SD 3.0-compliant bidirectional dual-voltage level translator with auto-direction control, designed to interface between 1.2 V–1.8 V host systems and 1.8 V/3.0 V SD/microSD/MMC memory cards. It supports SDR104 (208 MHz), DDR50, and legacy SD modes, integrates a 100 mA LDO for card-side I/O supply, and delivers ESD protection per IEC 61000-4-2 Level 4 (±8 kV contact) on all card-side pins.
For engineers reviewing the NVT4857UK datasheet, NVT4857UK pinout, NVT4857UK application, or NVT4857UK equivalent, this device addresses critical signal integrity, voltage translation, and system-level ESD robustness requirements in mobile memory interfaces-particularly where auto-enable via VSD, clock feedback (CLK_FB), and integrated EMI filtering are essential for high-speed SD 3.0 compliance.
Technical Context
The NVT4857UK implements a break-before-make push-pull output stage for low-power bidirectional translation across two independent voltage domains (host VCCA = 1.2–1.8 V; card-side VLDO = 1.8 V or VSD-tracked 3.0 V). Its auto-direction logic eliminates external direction-control signals by sensing data flow polarity and VSD voltage thresholds (enable at ≥2.45 V, disable at ≤2.4 V).
It integrates a programmable LDO (SEL-controlled 1.8 V/3.0 V output), on-die pull-up/pull-down resistors (70 kΩ on data/CMD lines), and EMI-filtered I/O drivers. The dedicated CLK_FB channel compensates PCB trace delay to preserve read timing margins at SDR104 speeds, while zero-clamping architecture isolates host-side circuitry from ESD stress on card-side pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Max Clock Rate | 208 MHz - enables full SD 3.0 SDR104 mode (104 MB/s) without external clock conditioning |
| Host Voltage Range | 1.2 V to 1.8 V - compatible with modern low-voltage SoCs and baseband processors |
| LDO Output Current | 100 mA - sufficient to power all card-side I/Os (DAT0–DAT3, CMD, CLK) under SDR104 load |
| ESD Protection | ±8 kV contact (IEC 61000-4-2 Level 4) on DATx, CMD, CLK, CD, VSD - meets system-level ESD immunity requirements |
| Propagation Delay | 2.5–5.5 ns (host↔card) - ensures setup/hold timing compliance at 208 MHz with minimal skew |
| Integrated Resistors | 70 kΩ pull-ups on all data/CMD lines; 100 Ω series resistors on host side - eliminates need for 12 external passives |
| Operating Temperature | −40 °C to +85 °C - qualified for consumer and industrial mobile applications |
Pinout & Package
Package: 20-ball WLCSP (Wafer-Level Chip-Scale Package), 1.7 mm × 2.1 mm × 0.49 mm, 0.4 mm pitch, lead-free, MSL3.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A1 (DAT2A) | Host-side bidirectional data line | I/O path for DAT2 signal; auto-direction controlled; 70 kΩ internal pull-up to VCCA |
| A2 (VCCA) | Host supply input | Primary power for host-side logic and drivers; range 1.1–2.0 V |
| A3 (VSD) | Card-side supply enable & tracking input | Auto-enables LDO/translator when ≥2.45 V; SEL determines whether VLDO = 1.8 V or tracks VSD |
| A4 (DAT2B) | Card-side bidirectional data line | I/O path for DAT2 signal; isolated from host ESD stress via zero-clamping architecture |
| B1 (DAT3A) | Host-side bidirectional data line | Part of 4-bit data bus; break-before-make switching prevents bus contention |
| B2 (CD) | Card detect output | Open-drain output with internal 70 kΩ pull-up to VCCA; detects card insertion/removal |
| B3 (VCCB) | LDO output decoupling node | Must be bypassed with 2.2 µF capacitor (low-ESR ≤50 mΩ); supplies card-side I/Os |
| B4 (DAT3B) | Card-side bidirectional data line | EMI-filtered driver stage reduces harmonic emissions into RF bands |
| C1 (CMDA) | Host-side command line | Full-duplex command path; supports CMD response timing in SDR104 mode |
| C2/C3 (GND) | Supply ground | Dual GND balls minimize ground bounce during high-speed switching |
| C4 (CMDB) | Card-side command line | Level-shifted CMD signal with <1.4 ns rise/fall time (1.8 V domain) |
| D1 (DAT0A) | Host-side data line 0 | Primary data lane; used for initialization and low-speed communication |
| D2 (CLKA) | Host clock input | High-impedance input (no loading); feeds internal PLL and CLK_FB generation |
| D3 (CLKB) | Card-side clock output | Driven at card-side voltage (1.8 V or VSD); synchronized to CLKA with <5.5 ns delay |
| D4 (DAT0B) | Card-side data line 0 | First data lane activated during card enumeration; supports default-speed mode |
| E1 (DAT1A) | Host-side data line 1 | Completes 4-bit host data bus; matched routing critical for SDR104 timing closure |
| E2 (CLK_FB) | Host clock feedback output | Provides phase-compensated clock to host controller to recover read data with margin |
| E3 (SEL) | Voltage select input | Configures LDO output: HIGH = 1.8 V, LOW = VSD-tracking (3.0 V); referenced to VCCA |
| E4 (DAT1B) | Card-side data line 1 | Part of 4-bit card data bus; ESD-protected and EMI-filtered per IEC 61000-4-2 |
Key Features
| Feature | Design Value |
|---|---|
| Auto-direction control | Eliminates external DIR signal and associated timing constraints; enables seamless full-duplex translation without host firmware intervention |
| Integrated 100 mA LDO | Delivers regulated 1.8 V or VSD-tracked 3.0 V to card-side I/Os; removes need for discrete regulator and sequencing logic |
| CLK_FB feedback channel | Compensates PCB trace delay to maintain >1 ns read timing margin at 208 MHz, critical for SDR104 reliability |
| On-die termination resistors | 70 kΩ pull-ups on all data/CMD lines and 100 Ω series resistors on host side reduce BOM count by 12 components |
| Zero-clamping ESD architecture | Routes ESD current from card-side pins directly to GND, preventing stress propagation to host SoC I/Os |
| EMI-filtered I/O drivers | Reduces higher-harmonic emissions from digital edges, easing RF coexistence in smartphones and tablets |
Applications
| Smartphones | Tablet PCs |
|---|---|
|
Use Scenario: High-density mobile SoC interfacing with microSD cards supporting UHS-I/UHS-II modes. IC Role / Device Role / Timing Role: Bidirectional level translator and card-side power manager; provides CLK_FB for precise read-data capture timing. Use Value: Enables SDR104 (208 MHz) operation without external regulators or direction logic, reducing PCB area and BOM cost by 15% vs discrete solutions. |
Use Scenario: Dual-slot tablet design requiring simultaneous SD and microSD support with shared host controller. IC Role / Device Role / Timing Role: Voltage translator with auto-enable (VSD-sensed) and dual-mode LDO (1.8 V/3.0 V) for mixed-card compatibility. Use Value: Single-chip support for both legacy SDHC and UHS-I cards eliminates need for separate level-shifting paths per slot. |
| Laptop SD Card Readers | Digital Cameras |
|
Use Scenario: Embedded SD card reader in ultrabook docking stations handling hot-plug events and speed negotiation. IC Role / Device Role / Timing Role: Card-detect (CD) output with integrated pull-up and ESD-hardened interface; auto-enables on VSD rise. Use Value: Robust system-level ESD immunity (±8 kV contact) meets laptop OEM requirements without additional TVS diodes. |
Use Scenario: High-resolution camera recording to SDXC cards at sustained write speeds >60 MB/s. IC Role / Device Role / Timing Role: Low-latency level translator with <5.5 ns propagation delay ensures reliable command/data handshaking at SDR50/SDR104. Use Value: Break-before-make architecture prevents bus contention during rapid mode switches (e.g., video burst writes), avoiding data corruption. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar SD memory card voltage translation applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| TXS0108E | 8-bit translator; no integrated LDO or CLK_FB; requires external direction control; max 100 MHz | Lacks auto-enable, ESD rating (±2 kV HBM only), and SDR104 timing support; needs 4 extra passives | Choose for cost-sensitive, non-SD3.0 designs where host handles direction and clock compensation |
| MAX14541E | 4-bit translator; includes LDO but no CLK_FB; 1.8 V fixed output only; ±15 kV air discharge ESD | No VSD-tracking capability; cannot support 3.0 V SD cards; lacks feedback path for SDR104 timing margin | Prefer when only 1.8 V cards are used and system-level ESD testing emphasizes air discharge over contact |
Compared with TXS0108E and MAX14541E, the NVT4857UK uniquely combines auto-direction control, VSD-tracking LDO, CLK_FB, and IEC 61000-4-2 Level 4 ESD in a single WLCSP-making it the only solution qualified for full SD 3.0 SDR104 implementation in space-constrained mobile platforms.
Availability
NVT4857UK is available at Aetrix Electronics and suitable for smartphones, tablet PCs, and embedded SD card readers requiring stable component supply, high-speed memory interface compliance, and robust system-level ESD protection.
Supply support for NVT4857UK includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.
Manufacturer
NXP Semiconductors is a global semiconductor company specializing in secure connectivity solutions for automotive, industrial, and mobile applications, with leadership in interface ICs and embedded security.
The NVT4857UK belongs to NXP's SD memory interface product line, engineered specifically to simplify high-speed, multi-voltage SD 3.0 integration in battery-powered portable devices while meeting stringent ESD and EMI requirements.
FAQ
What is the maximum supported SD bus mode for NVT4857UK?
The NVT4857UK fully supports SD 3.0 SDR104 mode at 208 MHz (104 MB/s), as well as SDR50, DDR50, SDR25, SDR12, and SD 2.0 High-Speed (50 MHz) and Default-Speed (25 MHz) modes. Its 2.5–5.5 ns propagation delay and CLK_FB feedback channel ensure timing margin compliance across all modes, especially during high-speed read operations.
How does the auto-enable function work on NVT4857UK?
The NVT4857UK auto-enables when VSD rises above 2.45 V (typical), powering the LDO and level translator logic; it auto-disables when VSD falls below 2.4 V (typical). This eliminates external enable sequencing, simplifies power-up timing, and ensures the card-side interface remains inactive until the memory card supply is stable-critical for hot-plug reliability.
Does NVT4857UK require external passive components?
The NVT4857UK requires only two external capacitors: a 2.2 µF low-ESR (<50 mΩ) capacitor at VCCB and a 0.1 µF capacitor at VSD. All pull-up/pull-down resistors (70 kΩ), series termination (100 Ω), and EMI filters are integrated-reducing total external component count to two versus 14+ in discrete implementations.
What is the role of the CLK_FB pin on NVT4857UK?
The CLK_FB pin on NVT4857UK delivers a phase-compensated copy of the card-side clock back to the host controller. This feedback path cancels PCB trace delay between CLKA and CLKB, preserving timing margins for read-data capture-especially vital at SDR104 speeds where even 100 ps skew can cause errors.
Can NVT4857UK support both 1.8 V and 3.0 V SD cards?
Yes. The NVT4857UK supports both 1.8 V and 3.0 V SD cards via its SEL pin: when SEL = HIGH, the integrated LDO outputs 1.8 V; when SEL = LOW, it tracks VSD (enabling 3.0 V operation). This dual-mode capability allows a single design to interoperate with legacy SDHC and modern UHS-I cards without hardware changes.
NVT4857UKZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- -
- Package/Case:
- 20-UFBGA, WLCSP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Applications:
- Memory Card
- Interface:
- -
- Voltage - Supply:
- 1.1V ~ 3.6V
- Supplier Device Package:
- 20-WLCSP
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
NVT4857UKZ FAQ
1.How can I place an order for NVT4857UKZ through Aetrix?
Please submit a Request for Quotation (RFQ) for NVT4857UKZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for NVT4857UKZ reliable?
The price and inventory of NVT4857UKZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for NVT4857UKZ is usually 5 days.
3.What payment methods are accepted for NVT4857UKZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for NVT4857UKZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for NVT4857UKZ?
NVT4857UKZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your NVT4857UKZ order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for NVT4857UKZ?
For technical support, including NVT4857UKZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your NVT4857UKZ requirements.
6.How does Aetrix verify that NVT4857UKZ is sourced from the original manufacturer or authorized distributors?
All NVT4857UKZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that NVT4857UKZ meets industry standards.
7.What is the process for return or replacement of NVT4857UKZ?
All NVT4857UKZ units undergo pre-shipment inspection (PSI). If there is an issue with NVT4857UKZ, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The NVT4857UKZ part is unused and in its original packaging.
Return procedure for NVT4857UKZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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