Infineon Technologies S71VS128RC0AHK4L3

Overview

S71VS128RC0AHK4L3 from Cypress Semiconductor (formerly Spansion) is a 128 Mb MirrorBit Flash + 64 Mb pSRAM stacked Multi-Chip Package (MCP) for simultaneous read/write burst-mode operation in 1.8 V-only systems. It integrates flash memory and pseudo-static RAM on a single 56-ball VFRBGA package (7.7 × 6.2 mm, 0.5 mm pitch), supports 108 MHz burst speed, operates from –25 °C to +85 °C (Wireless grade), and targets mobile baseband and application processors requiring low-latency code execution and fast data buffering.

For engineers reviewing the S71VS128RC0AHK4L3 datasheet, S71VS128RC0AHK4L3 pinout, S71VS128RC0AHK4L3 application, or S71VS128RC0AHK4L3 equivalent, key selection criteria include burst clock timing compatibility, shared address/data multiplexing behavior, Flash/pSRAM RDY/WAIT polarity alignment, and VFRBGA thermal/mechanical constraints in space-constrained handheld designs.

Technical Context

The device implements dual-die stacking with independent Flash (S29VS128R) and pSRAM (SWM064D108M1R) dies sharing a common 16-bit multiplexed address/data bus (A/DQ15–A/DQ0) and control signals including CLK, OE#, WE#, CE#, and AVD#. Burst mode operation uses internal address incrementing triggered by rising CLK edges after initial address latching via AVD#.

Flash and pSRAM share VCC (1.7–1.95 V), VCCQ (I/O supply), VSS, and VSSQ, but maintain separate chip enables (F-CE# and R-CE#), reset (F-RST#), and ready/wait signaling (F-RDY/R-WAIT), with configurable polarity via Bus Configuration Register bit 10 to synchronize timing handshaking across both memory types.

Key Specifications

Pinout & Package

Package: Very Thin Fine-Pitch Ball Grid Array (VFRBGA), 56-ball, 7.7 mm × 6.2 mm, 0.5 mm ball pitch, 1.0 mm max height, Pb-free and low-halogen compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar Flash + pSRAM MCP applications.

Compared with S71VS128RB0AHK3L, this part adds 32 Mb pSRAM capacity enabling richer real-time buffering; compared with S71VS256RC0AHK4L, it reduces Flash density to lower cost and power in fixed-function devices where firmware size is stable and bounded.

Availability

S71VS128RC0AHK4L3 is available at Aetrix Electronics and suitable for mobile baseband processors, smartphone application processors, wearable health monitors, and IoT edge node controllers requiring stable component supply with guaranteed long-term lifecycle support.

Supply support for S71VS128RC0AHK4L3 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

Cypress Semiconductor (now part of Infineon Technologies since 2020) is a leader in high-performance, low-power embedded memory and microcontroller solutions, founded in 1982 and headquartered in San Jose, CA.

The S71VS-R series was developed specifically for space-constrained wireless platforms needing integrated, low-voltage, burst-capable memory-targeting cellular handsets, feature phones, and early LTE modems before the rise of eMMC/UFS dominance.

FAQ

What is the default polarity of F-RDY/R-WAIT, and how is it configured?

The default polarity differs: Flash RDY is Active HIGH (VOH = data valid), while pSRAM WAIT is Active LOW (VOL = data valid). Polarity alignment is achieved by setting bit 10 of the pSRAM Bus Configuration Register to 0 (making WAIT Active LOW) or bit 10 of the Flash Configuration Register to 0 (making RDY Active LOW). This eliminates external logic and ensures synchronous handshake timing.

Does S71VS128RC0AHK4L3 support asynchronous read mode in addition to burst mode?

Yes, it supports both modes. In asynchronous mode, CLK is held at VIH or VIL, and operations are controlled solely by OE#, WE#, and CE# timing. AVD# must still be asserted to latch addresses. Asynchronous mode is used for random-access debugging or initialization sequences where burst timing is not required.

How are address lines allocated between Flash and pSRAM in this 128 Mb + 64 Mb configuration?

For S71VS128RC0, Flash uses A22 and pSRAM uses A21–A16, with A/DQ15–A/DQ0 serving as shared multiplexed bus. The top address bit (A22) selects Flash bank, while A21–A16 provide pSRAM row/column addressing. No external address demultiplexing is needed-the MCP internally routes based on CE# selection and command context.

Is ultrasonic cleaning safe for the S71VS128RC0AHK4L3 VFRBGA package?

No-ultrasonic cleaning is explicitly prohibited per Cypress documentation. FBGA packages like this VFRBGA are susceptible to internal die attach damage and wire bond fracture under ultrasonic energy. Recommended cleaning methods include vapor-phase or batch spray cleaning with approved low-residue flux removers, followed by thorough drying at ≤125 °C.