Renesas 71V65903S85PFGI

Overview

71V65903S85PFGI from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM organized as 512K x 18 (9,437,184-bit), supporting 100 MHz operation with 7.5 ns clock-to-data access, zero bus turnaround (ZBT) architecture, flow-through outputs, and burst counter functionality - deployed in high-speed packet buffering, network switch fabric, and real-time DSP memory subsystems.

For engineers reviewing the 71V65903S85PFGI datasheet, 71V65903S85PFGI pinout, 71V65903S85PFGI application, or 71V65903S85PFGI equivalent, key selection criteria include its 100 MHz synchronous interface, 4-word interleaved/linear burst capability, individual byte write control (BW1–BW2), industrial temperature range (–40°C to +85°C), and JEDEC-standard 100-pin TQFP package with VDDQ-separated I/O supply.

Technical Context

The 71V65903S85PFGI implements a synchronous, clocked architecture where address/control registration occurs on the rising CLK edge, with data output appearing one cycle later via flow-through path (no output register). Its internal burst counter advances on ADV/LD = HIGH, enabling four consecutive accesses per address load.

ZBT operation eliminates dead cycles between read/write transitions by overlapping bus enable/disable with data transfer timing; OE is asynchronous but typically tied low, while ZZ enables low-power sleep mode with guaranteed data retention. The device uses three chip enables (CE1, CE2 active-low; CE2 active-high) for depth expansion and supports both linear and interleaved burst sequences via static LBO pin configuration.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm footprint, with exposed thermal pad (PFGI suffix denotes industrial-grade TQFP).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1375BV33-100AXC and AS7C35128P-10JCN, the 71V65903S85PFGI delivers deterministic 7.5 ns flow-through latency and hardware-accelerated ZBT operation - critical for sustaining full bandwidth in burst-intensive, mixed-access memory subsystems without software or logic overhead.

Availability

71V65903S85PFGI is available at Aetrix Electronics and suitable for industrial automation, network infrastructure, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 71V65903S85PFGI 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

IDT (Integrated Device Technology), now part of Renesas Electronics, is a semiconductor company specializing in high-performance timing, memory, and interface solutions for communications and computing markets.

The 71V65903S85PFGI belongs to IDT's ZBT™ SRAM product line, designed specifically for zero-latency, high-throughput memory subsystems in networking, telecom, and real-time embedded systems demanding deterministic burst access and seamless read/write transitions.

FAQ

What is the memory organization and total capacity of the 71V65903S85PFGI?

The 71V65903S85PFGI is organized as 512K × 18, delivering 9,437,184 bits (9.4 Mbit) of synchronous SRAM. This configuration supports 18-bit data paths and is optimized for systems requiring balanced depth and width - such as network packet buffers and DSP data memory - with native compatibility for depth expansion using its three chip enable pins.

Does the 71V65903S85PFGI support burst read and write operations, and how is burst order controlled?

Yes, the 71V65903S85PFGI supports 4-word burst reads and writes using an internal counter. Burst order is selected via the LBO pin: LOW configures linear sequence (A0, A1, A2, A3), HIGH selects interleaved (A0, A2, A1, A3). The ADV/LD pin controls counter behavior - LOW loads a new address, HIGH advances the counter - enabling efficient sequential access without external address generation.

What is the role of the ZZ pin on the 71V65903S85PFGI, and does it retain data during sleep mode?

The ZZ pin is an asynchronous sleep mode input; when driven HIGH, it internally gates the clock and reduces power consumption to the lowest level while guaranteeing data retention. The 71V65903S85PFGI maintains stored memory contents in ZZ mode across its full industrial temperature range (–40°C to +85°C), making it suitable for power-sensitive applications with periodic activity bursts.

How does the 71V65903S85PFGI implement Zero Bus Turnaround (ZBT), and what benefit does it provide?

The 71V65903S85PFGI implements ZBT by eliminating idle bus cycles between read and write operations through synchronized control logic and flow-through outputs. This allows immediate transition from one access type to another without waiting for bus release/reacquisition - sustaining near-peak bandwidth in mixed-access workloads like packet forwarding or real-time filtering, where traditional SRAMs incur 1–2 cycle penalties per turnaround.

What package type and pin count does the 71V65903S85PFGI use, and is it RoHS-compliant?

The 71V65903S85PFGI uses a 100-pin plastic thin quad flatpack (TQFP) per JEDEC MO-145, with 14 mm × 20 mm body size and exposed thermal pad (PFGI suffix). It is RoHS-compliant and qualifies as a green part per IDT's environmental policy - verified by lead-free terminations and halogen-free molding compound, meeting IPC/JEDEC J-STD-609A Class 1 requirements.