Renesas 71V65903S80BG8

Overview

71V65903S80BG8 from IDT (now Renesas Electronics) is a 3.3V synchronous ZBT™ SRAM organized as 512K x 18 (9,437,184-bit), delivering 100 MHz operation with 7.5 ns clock-to-data access. It features zero bus turnaround (ZBT), flow-through outputs, burst counter, and individual byte write control - deployed in high-speed networking packet buffers, telecom line cards, and FPGA co-processor memory interfaces.

For engineers reviewing the 71V65903S80BG8 datasheet, 71V65903S80BG8 pinout, 71V65903S80BG8 application, or 71V65903S80BG8 equivalent, key selection criteria include ZBT timing compliance, 3.3V I/O compatibility, industrial temperature support (–40°C to +85°C), TQFP-100 package footprint, and burst-mode read/write sequencing with LBO-controlled linear/interleaved addressing.

Technical Context

The 71V65903S80BG8 implements a synchronous, clock-driven architecture where address/control inputs are registered on the rising CLK edge, and data transfers occur one cycle later. Its internal burst counter advances on ADV/LD = HIGH, supporting four-word bursts with LBO-selectable linear or interleaved sequences.

ZBT operation eliminates dead cycles between read/write transitions via internally synchronized output buffer enable and single R/W control. The device uses flow-through outputs (no output register), asynchronous OE and ZZ pins, and three chip enables (CE1, CE2 active-low; CE2 active-high) for depth expansion without external logic.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch, lead-free and RoHS-compliant. Pinout matches PKG100 configuration for 512K × 18 variant (documented in Rev. 6.42, Figure 6).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1373KV18 and AS7C35128P, the 71V65903S80BG8 uniquely delivers ZBT timing and integrated burst control in a pin-compatible 100-TQFP package - enabling legacy system upgrades without PCB redesign while preserving deterministic latency.

Availability

71V65903S80BG8 is available at Aetrix Electronics and suitable for packet buffering, FPGA co-processing, telecom line card design, and industrial real-time control requiring stable component supply across extended product lifecycles.

Supply support for 71V65903S80BG8 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 leader specializing in high-performance timing, memory, and interface solutions for communications and computing infrastructure.

The 71V65903S80BG8 belongs to IDT's ZBT™ SRAM family, engineered specifically for zero-latency, high-throughput buffering in packet-switched networks and real-time embedded systems demanding deterministic memory access.

FAQ

What is the memory organization and density of the 71V65903S80BG8?

The 71V65903S80BG8 is organized as 512K × 18, providing 9,437,184 bits (9.4 Mbit) of synchronous SRAM. This configuration supports efficient 18-bit data paths common in telecom and FPGA interfaces, and enables depth expansion using its three chip enable pins (CE1, CE2, CE2) without external decoding logic.

Does the 71V65903S80BG8 support burst mode, and how is it configured?

Yes, the 71V65903S80BG8 supports a 4-word burst mode controlled by the ADV/LD and LBO pins. When ADV/LD is HIGH, the internal burst counter advances; LBO selects linear (LBO = LOW) or interleaved (LBO = HIGH) addressing. Burst operation reduces address bus toggling and simplifies controller firmware for sequential access patterns.

What package type and pin count does the 71V65903S80BG8 use?

The 71V65903S80BG8 is supplied in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body size, 0.5 mm pitch. This PKG100 footprint is shared across the 71V65703/71V65903 family and supports industrial temperature operation (–40°C to +85°C) with RoHS-compliant lead finish.

How does the ZBTTM feature improve system performance in the 71V65903S80BG8?

ZBTTM (Zero Bus Turnaround) in the 71V65903S80BG8 eliminates idle cycles between consecutive read and write operations. By synchronizing output enable internally and supporting immediate bus direction reversal, it enables back-to-back memory transactions - critical for maximizing bandwidth in packet buffering and streaming applications.

Can the 71V65903S80BG8 operate in low-power mode, and how is it activated?

Yes, the 71V65903S80BG8 supports low-power sleep mode via the asynchronous ZZ pin. Driving ZZ HIGH gates the internal clock and reduces dynamic power consumption while guaranteeing data retention. This mode is ideal for intermittent operation in telecom line cards and industrial controllers where standby power must be minimized.