Renesas 71V3577S85PFGI

Overview

71V3577S85PFGI from Renesas Electronics is a 128K × 36-bit (4.608 Mb), 3.3V synchronous SRAM with flow-through outputs, burst counter, and single-cycle deselect. It supports 8.5 ns access time at up to 87 MHz clock frequency, operates across –40°C to +85°C industrial temperature range, and uses JEDEC-standard 100-pin TQFP packaging. It serves as high-speed cache or buffer memory in networking line cards and telecom baseband processors.

For engineers reviewing the 71V3577S85PFGI datasheet, 71V3577S85PFGI pinout, 71V3577S85PFGI application, or 71V3577S85PFGI equivalent, key selection criteria include burst mode support (linear/interleaved via LBO), self-timed write with global/byte write enables, flow-through output architecture, industrial temperature rating, and TQFP-100 mechanical compatibility.

Technical Context

The 71V3577S85PFGI implements a synchronous, clock-driven interface with registered address and data inputs, yet unregistered (flow-through) data outputs - enabling minimal read latency. Its internal burst address counter advances on ADV=LOW and selects sequence order via static LBO input (VSS for linear, VDD for interleaved).

Write control is hierarchical: GW enables full 36-bit writes, while BWE and BW1–BW4 allow byte-selectable writes (9-bit per byte). Power management includes asynchronous ZZ sleep mode (≤35 µA ISB2) and synchronous chip deselect with single-cycle deactivation.

Key Specifications

Pinout & Package

71V3577S85PFGI is packaged in a 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch, lead-free and RoHS-compliant. Pin 1 marked via corner cutout; top-side marking includes "71V3577S85PFGI" and date code.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar synchronous SRAM applications.

Compared with 71V3577S85PF and CY7C1371DV33-85AXC, the 71V3577S85PFGI uniquely combines industrial temperature rating, dual-address-status inputs (ADSP/ADSC), and hardware-configurable burst order - making it optimal for telecom infrastructure and real-time embedded systems demanding robust timing and interface flexibility.

Availability

71V3577S85PFGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and aerospace data acquisition systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 71V3577S85PFGI 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and enterprise applications.

The 71V3577S series belongs to Renesas' high-speed synchronous SRAM product line, designed specifically for bandwidth-intensive, low-latency applications in networking equipment, base stations, and real-time control systems.

FAQ

What is the maximum clock frequency supported by the 71V3577S85PFGI?

The 71V3577S85PFGI supports a maximum clock frequency of 87 MHz, corresponding to its 8.5 ns access time specification. This rating is guaranteed across the full industrial temperature range (–40°C to +85°C) and under worst-case voltage conditions (VDD = 3.135 V, VDDQ = 3.135 V). Operation above 87 MHz is not characterized or supported.

Does the 71V3577S85PFGI support both 128K × 36 and 256K × 18 configurations?

Yes, the 71V3577S85PFGI supports both memory organizations. In 128K × 36 mode, it uses address lines A0–A16; in 256K × 18 mode, A17 becomes active and data width reduces to 18 bits (I/O0–I/O17 plus I/OP1–I/OP2). The configuration is determined by system address decoding and data bus width - no internal mode pin or register setting is required.

How does the LBO pin affect burst behavior in the 71V3577S85PFGI?

The LBO pin statically selects burst order: when pulled to VSS (LOW), the 71V3577S85PFGI executes linear burst sequencing (00→01→10→11); when pulled to VDD (HIGH), it uses interleaved sequencing (00→01→11→10). LBO must remain stable during operation - changing it mid-burst causes undefined address progression and potential data corruption.

What is the purpose of the ADSP and ADSC pins on the 71V3577S85PFGI?

ADSP (Address Status from Processor) and ADSC (Address Status from Cache Controller) are synchronous inputs that trigger loading of the internal address register. ADSP is gated by CE and used for CPU-initiated accesses; ADSC operates independently and enables cache coherency protocols. Both accept active-LOW pulses synchronized to CLK, allowing dual-source address latching without external arbitration logic.

Can the 71V3577S85PFGI be used in a system requiring low-power sleep mode?

Yes, the 71V3577S85PFGI supports full sleep mode via the asynchronous ZZ input. When ZZ is driven HIGH, the device gates its internal clock and reduces supply current to ≤35 µA (IZZ), while retaining full data integrity. Recovery time (tZZR) is 100 ns, and the device must be deselected before entering sleep mode to ensure proper state retention.