NXP Semiconductors SAF1508BET/V1,118

Overview

SAF1508BET/V1,118 from NXP Semiconductors is a ULPI-compliant Hi-Speed USB 2.0 On-The-Go (OTG) transceiver supporting 480 Mbit/s high-speed, 12 Mbit/s full-speed, and 1.5 Mbit/s low-speed operation. It serves as the physical-layer front-end for USB host/peripheral/OTG controllers via an 8-pin DDR or 12-pin SDR synchronous interface, integrates 45 Ω HS termination, 1.5 kΩ pull-up, and 15 kΩ host resistors, and operates in automotive-grade temperature range (−40 °C to +85 °C).

For engineers reviewing the SAF1508BET/V1,118 datasheet, SAF1508BET/V1,118 pinout, SAF1508BET/V1,118 application, or SAF1508BET/V1,118 equivalent, this page delivers verified technical context, ULPI interface timing constraints, OTG-specific register control behavior, UART-transparent mode implementation, and automotive-qualified power sequencing requirements.

Technical Context

The SAF1508BET/V1,118 implements a dual-mode ULPI interface-selectable via CFG0 pin between 60 MHz 8-bit DDR (DATA[3:0] on both clock edges) and 60 MHz 8-bit SDR (all DATA[7:0] on rising edge only). Its integrated PLL accepts 13/19.2/24/26 MHz crystal or clock inputs (selected by CFG1/CFG2) and generates internal 480 MHz (HS), 12 MHz (FS), 1.5 MHz (LS), and 60 MHz (ULPI) clocks with ±500 ppm data recovery tolerance.

It embeds a complete OTG analog subsystem: ID detector with internal weak pull-up, VBUS comparators (valid ≥4.4 V, session valid 0.8–2.0 V, session end 0.2–0.8 V), SRP charge/discharge resistors, and PSW_N open-drain output for external VBUS switch control. UART mode repurposes DP/DM as RXD/TXD at 2.7 V while maintaining DATA0/DATA1 I/O at 1.4–1.95 V.

Key Specifications

Pinout & Package

SAF1508BET/V1,118 is housed in a RoHS-compliant, halogen-free TFBGA36 package (3.5 mm × 3.5 mm × 0.8 mm) with 36 solder balls arranged in a 6×6 grid. Ball pitch is 0.5 mm; recommended PCB pad size is 0.25 mm diameter with 0.3 mm solder mask opening.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar USB OTG transceiver applications.

Compared with USB334x and ISP1507, the SAF1508BET/V1,118 uniquely combines ULPI interface efficiency, automotive-grade OTG analog subsystem integration, and UART transparency-reducing total solution size by 35% and eliminating 9 external components versus the ISP1507, while offering AEC-Q100 compliance unavailable in the USB334x family.

Availability

SAF1508BET/V1,118 is available at Aetrix Electronics and suitable for automotive infotainment docking, telematics control unit (TCU) USB host, and vehicle-to-cloud gateway applications requiring stable component supply across extended product lifecycles.

Supply support for SAF1508BET/V1,118 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT markets, with headquarters in Eindhoven, Netherlands.

The SAF1508BET/V1,118 belongs to NXP's automotive-qualified USB transceiver product line, engineered specifically for robust USB 2.0 OTG implementation in harsh-temperature vehicle environments-including infotainment, telematics, and diagnostic systems.

FAQ

What USB specifications does the SAF1508BET/V1,118 comply with?

The SAF1508BET/V1,118 complies with Universal Serial Bus Specification Rev. 2.0, On-The-Go Supplement to the USB 2.0 Specification Rev. 1.3, and UTMI+ Low Pin Interface (ULPI) Specification Rev. 1.1. It supports all three USB 2.0 speeds-high-speed (480 Mbit/s), full-speed (12 Mbit/s), and low-speed (1.5 Mbit/s)-and implements full OTG functionality including Host Negotiation Protocol (HNP) and Session Request Protocol (SRP). The SAF1508BET/V1,118 is explicitly restricted to automotive applications per NXP's product documentation.

How does the SAF1508BET/V1,118 handle USB clock recovery and data integrity?

The SAF1508BET/V1,118 uses an integrated PLL and clock recovery circuit that supports ±500 ppm data rate tolerance, enabling reliable reception of USB data even with significant oscillator drift. It performs NRZI encoding/decoding, bit stuffing insertion/removal, and SYNC/EOP pattern handling for packet framing. Elastic buffer management prevents underrun/overrun errors, and built-in error detection flags bit-stuff violations and byte-alignment faults-ensuring robust data integrity in automotive EMI environments. This behavior is intrinsic to the SAF1508BET/V1,118's USB serializer/deserializer architecture.

Can the SAF1508BET/V1,118 operate in UART mode, and how is it enabled?

Yes, the SAF1508BET/V1,118 supports transparent UART mode where DP functions as RXD and DM as TXD at 2.7 V logic levels. UART mode is entered exclusively via register write to the MODE register; it cannot be triggered by pin strapping. Exit occurs either by asserting the STP signal or toggling the CHIP_SEL pin. During UART operation, DATA0 and DATA1 serve as level-shifted I/O paths between the 1.4–1.95 V core and 2.7 V UART lines-making the SAF1508BET/V1,118 suitable for dual-mode accessory interfaces without external level shifters.

What are the power supply requirements for the SAF1508BET/V1,118?

The SAF1508BET/V1,118 requires two supplies: VCC (3.0–4.5 V) powers the main regulator and analog front-end, while VCC(I/O) (1.4–1.95 V) sets the ULPI interface voltage and powers CFG/CHIP_SEL/DATA pins. Internal REG3V3 (2.7/3.3 V) and REG1V8 outputs power analog and digital blocks respectively-each requiring parallel 0.1 µF and 4.7 µF capacitors. In power-down mode (CHIP_SEL inactive), VCC(I/O) absence shuts down regulators, reducing current to 0.5 µA. This dual-supply architecture is essential for interfacing with low-voltage SoCs while maintaining USB signal integrity in the SAF1508BET/V1,118.

Is the SAF1508BET/V1,118 qualified for automotive use, and what certifications apply?

Yes, the SAF1508BET/V1,118 is explicitly designated for automotive applications per NXP's datasheet, with full industrial temperature range operation (−40 °C to +85 °C) and AEC-Q100 stress qualification. It meets JESD22-A114D (2 kV HBM), JESD22-A115-A (200 V MM), and JESD22-C101C (500 V CDM) ESD standards. Its integrated VBUS comparators, ID detector, and SRP circuitry comply with USB OTG Supplement Rev. 1.3 for automotive docking scenarios. Use outside automotive systems is prohibited per NXP's licensing terms-this restriction is binding for the SAF1508BET/V1,118.