Infineon Technologies S71VS128RC0AHK4L0

Overview

S71VS128RC0AHK4L0 from Cypress Semiconductor is a 128 Mb MirrorBit Flash + 64 Mb pSRAM stacked Multi-Chip Package (MCP) operating at 1.7–1.95 V, supporting 108 MHz burst read/write, with 56-ball VFRBGA (7.7 × 6.2 mm, 0.5 mm pitch), designed for wireless handsets requiring simultaneous nonvolatile storage and fast volatile memory access.

For engineers reviewing the S71VS128RC0AHK4L0 datasheet, S71VS128RC0AHK4L0 pinout, S71VS128RC0AHK4L0 application, or S71VS128RC0AHK4L0 equivalent, key selection factors include burst-mode timing compatibility, shared address/data multiplexing, boot configuration (Top Boot), industrial temperature range (–40 °C to +85 °C), and dual-die power sequencing requirements.

Technical Context

This MCP integrates a S29VS128R Flash die and SWM064D108M1R pSRAM die in a single package, sharing A/DQ[15:0], CLK, OE#, WE#, CE# (separate F-CE# and R-CE#), and AVD# signals. Address mapping differs per density: Flash uses A22 and A21–A16; pSRAM uses A22 and A21–A16 - enabling unified bus control with distinct chip enables.

The device supports asynchronous and burst read/write modes. In burst mode, CLK increments internal address counters after initial word output; RDY/WAIT polarity mismatch between Flash (active-high RDY) and pSRAM (active-high WAIT) is resolved via Bus Configuration Register bit 10 or Flash Configuration Register bit 10, ensuring synchronized data valid timing.

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, low-halogen.

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 industrial temperature support and Top Boot configuration; compared with S71VS256RC0AHK4L, it reduces Flash footprint and cost while maintaining identical pSRAM capacity and timing - ideal for cost-constrained industrial designs with fixed firmware size.

Availability

S71VS128RC0AHK4L0 is available at Aetrix Electronics and suitable for smartphone baseband modules, industrial telematics units, and portable medical monitors requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature compliance.

Supply support for S71VS128RC0AHK4L0 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, founded in 1982, delivers programmable SoCs, microcontrollers, analog ICs, connectivity solutions, and high-performance memories for automotive, industrial, and consumer applications.

The S71VS-R series belongs to Cypress's legacy Spansion MCP memory portfolio, engineered specifically for space-constrained wireless platforms needing integrated nonvolatile and volatile memory with burst-mode performance and industrial reliability.

FAQ

What is the correct power-up sequencing for S71VS128RC0AHK4L0?

VCC must stabilize before VCCQ, with both supplies reaching regulation within 100 ms. The recommended sequence is: apply VCC first, then VCCQ, followed by asserting F-RST# low for ≥100 µs after both supplies are stable. This ensures proper initialization of both Flash and pSRAM dies and avoids undefined state transitions.

How is RDY/WAIT polarity mismatch resolved between Flash and pSRAM?

The default Flash RDY (active-high) and pSRAM WAIT (active-high) have opposite valid states. Polarity alignment is achieved by writing '0' to bit 10 of the pSRAM Bus Configuration Register (to make WAIT active-low) or bit 10 of the Flash Configuration Register (to make RDY active-low). Both methods yield identical timing behavior.

Does S71VS128RC0AHK4L0 support asynchronous write operations?

Yes - asynchronous writes are supported on both Flash and pSRAM using WE#, OE#, and CE# control signals without CLK involvement. However, burst-mode writes require CLK edges to increment internal addresses; asynchronous mode is used for single-word programming or pSRAM byte-lane writes where precise timing control is needed.

What is the maximum allowable reflow temperature profile for the VFRBGA package?

The VFRBGA package is rated for JEDEC J-STD-020D-compliant reflow. Peak temperature must not exceed 260 °C for ≤30 seconds, with ramp-up rate ≤3 °C/s and ramp-down rate ≤6 °C/s. Exposure above 150 °C for prolonged periods risks solder joint integrity and die attach degradation - strict adherence to the profile is mandatory.