Renesas 71V65903S80BGI

Overview

71V65903S80BGI from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM organized as 512K × 18 bits (9,437,184-bit capacity), delivering 100 MHz operation with 7.5 ns clock-to-data access time. It implements zero bus turnaround (ZBT) architecture to eliminate dead cycles between read/write transitions and supports interleaved or linear 4-word burst modes via LBO control - deployed in high-speed networking packet buffers and telecom baseband subsystems.

For engineers reviewing the 71V65903S80BGI datasheet, 71V65903S80BGI pinout, 71V65903S80BGI application, or 71V65903S80BGI equivalent, key selection criteria include its 3.3V core/I/O supply, industrial temperature range (–40°C to +85°C), flow-through output architecture, synchronous burst counter, and support for individual byte write enables (BW1–BW2) in x18 configuration.

Technical Context

The 71V65903S80BGI uses a synchronous CMOS architecture with registered address/control inputs and flow-through data outputs - no output register - enabling deterministic timing relative to CLK's rising edge. Its internal burst counter advances on ADV/LD = HIGH, while external address loading occurs on ADV/LD = LOW, with burst order selected statically by LBO.

Three chip enables (CE1, CE2 active-low; CE2 active-high) allow flexible depth expansion and one-cycle deselect with tri-state output after deactivation. Clock Enable (CEN) suspends all synchronous operations without affecting output state, and ZZ input places the device in low-power sleep mode with guaranteed data retention.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, lead-free and RoHS-compliant (suffix 'G'), with industrial-grade thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355BV18-100AXC and AS7C35128PFSIG, the 71V65903S80BGI uniquely delivers zero-bus-turnaround latency and integrated burst addressing - reducing controller overhead and improving determinism in real-time packet and signal processing systems.

Availability

71V65903S80BGI is available at Aetrix Electronics and suitable for high-speed packet buffering, baseband signal processing, telecom control plane memory, and industrial real-time PLC buffer applications requiring stable component supply, long-term lifecycle assurance, and industrial temperature compliance.

Supply support for 71V65903S80BGI 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 timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71V65903S80BGI belongs to IDT's ZBT™ SRAM product line, engineered specifically for low-latency, high-throughput data buffering in networking, telecom, and real-time embedded systems where deterministic timing is critical.

FAQ

What memory organization does the 71V65903S80BGI support?

The 71V65903S80BGI is strictly configured as 512K × 18 (9.4 Mbit), as confirmed by its pinout (A0–A18 used, BW3/BW4 NC), functional block diagram for 512K×18, and datasheet labeling. It does not operate in 256K×36 mode - that configuration applies only to the 71V65703 variant.

Does the 71V65903S80BGI support burst read and write operations?

Yes, the 71V65903S80BGI supports 4-word synchronous burst operations for both reads and writes. Burst sequencing is controlled by ADV/LD and LBO, with linear or interleaved order selectable. Burst cycles execute automatically after initial address load - no external address incrementing required.

What is the role of the ZZ pin on the 71V65903S80BGI?

The ZZ pin on the 71V65903S80BGI is an asynchronous active-high sleep mode input. When asserted, it internally gates the clock and reduces power consumption to minimum while guaranteeing data retention - essential for power-sensitive telecom and industrial applications.

How does the 71V65903S80BGI implement zero bus turnaround (ZBT)?

The 71V65903S80BGI achieves ZBT by eliminating idle cycles between consecutive read and write operations. Its architecture allows immediate initiation of a new access (read or write) on the next clock edge after the previous data transfer completes - verified in timing diagrams and truth tables for mixed-load/burst cycles.

Is the 71V65903S80BGI compatible with commercial-temperature-only designs?

No - the 'BGI' suffix explicitly denotes industrial temperature grade (–40°C to +85°C). It is not rated for commercial-only operation; its characterization, screening, and qualification are performed across the full industrial range, making it unsuitable for cost-optimized commercial applications where extended temperature is unnecessary.