Renesas 71V65903S80PFG8

Overview

71V65903S80PFG8 from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM organized as 512K × 18 bits (9,437,184-bit capacity), supporting 100 MHz operation with 7.5 ns clock-to-data access. It implements Zero Bus Turnaround for dead-cycle-free read/write transitions, features flow-through outputs, and uses a synchronous burst counter with linear/interleaved addressing via LBO pin - deployed in high-speed networking and packet buffering systems.

For engineers reviewing the 71V65903S80PFG8 datasheet, 71V65903S80PFG8 pinout, 71V65903S80PFG8 application, or 71V65903S80PFG8 equivalent, key selection criteria include its 100 MHz timing compliance, 3.3V core/I/O supply tolerance (±5%), industrial temperature range (–40°C to +85°C), TQFP-100 package, and ZBT architecture enabling seamless bus turnaround in burst-mode memory subsystems.

Technical Context

The 71V65903S80PFG8 employs a synchronous CMOS architecture with registered address/control inputs triggered on the rising CLK edge, and flow-through (unregistered) data outputs. Its internal burst counter advances on ADV/LD = HIGH, supporting four-word bursts with order selected by static LBO pin (LOW = linear, HIGH = interleaved).

It integrates three chip enables (CE1, CE2 active-low; CE2 active-high) for depth expansion, individual byte write controls (BW1–BW4), asynchronous OE and ZZ pins, and Clock Enable (CEN) for full synchronous suspension. All I/Os are 3.3V-compatible with VDDQ decoupling, and power-down mode retains data with ZZ = HIGH.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm footprint, lead-free and RoHS-compliant (Pb-free, Green part per ordering info). Pinout matches PKG100 configuration for 512K × 18 variant (documented in Rev. 6.42, Figure 5298 drw 02a).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371DV33-100AXC and AS7C35128PFSIG, the 71V65903S80PFG8 uniquely delivers ZBT-enabled dead-cycle elimination and integrated burst addressing - reducing system-level timing constraints and simplifying controller design for high-throughput single-bus memory interfaces.

Availability

71V65903S80PFG8 is available at Aetrix Electronics and suitable for packet buffering, telecom line card memory, real-time video frame storage, and industrial PLC data logging requiring stable component supply across extended temperature and long-lifecycle programs.

Supply support for 71V65903S80PFG8 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, computing, and industrial markets.

The 71V65903S80PFG8 belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency bus turnaround in high-speed packet-processing and real-time buffering applications where deterministic timing and burst efficiency are critical.

FAQ

What memory organization does the 71V65903S80PFG8 support?

The 71V65903S80PFG8 is configured as 512K × 18 bits (9,437,184 total bits), optimized for systems requiring wide data paths with moderate depth. This organization maps directly to 19 address lines (A0–A18) and supports depth expansion using its three chip enable pins (CE1, CE2, CE2). The 71V65903S80PFG8 does not support the 256K × 36 configuration - that is exclusive to the 71V65703 variant.

Does the 71V65903S80PFG8 require external OE control?

No - the 71V65903S80PFG8 features internally synchronized output enable logic, eliminating the need for precise OE timing control. The OE pin is asynchronous but can be tied LOW permanently in most applications since output drivers remain enabled during valid read cycles. This simplifies PCB layout and removes a critical timing constraint from the memory interface design.

How does the ZBTTM feature improve performance in the 71V65903S80PFG8?

The ZBTTM (Zero Bus Turnaround) feature in the 71V65903S80PFG8 removes idle cycles between consecutive read and write operations. Unlike conventional SRAMs that require bus release/reacquisition, the 71V65903S80PFG8 transitions seamlessly - enabling back-to-back burst accesses at full 100 MHz. This directly increases effective memory bandwidth in packet-forwarding and streaming applications.

What is the role of the ADV/LD and LBO pins on the 71V65903S80PFG8?

On the 71V65903S80PFG8, ADV/LD controls burst counter behavior: LOW loads a new external address, HIGH advances the internal counter. LBO selects burst order - LOW enables linear sequence (0,1,2,3), HIGH enables interleaved (0,2,3,1). Both are static inputs; LBO must remain stable during operation, and ADV/LD timing is synchronous to CLK with setup/hold requirements.

Is the 71V65903S80PFG8 compatible with industrial temperature requirements?

Yes - the 71V65903S80PFG8 is qualified for industrial temperature operation from –40°C to +85°C, with full electrical specifications guaranteed across this range. Its 3.3V ±5% supply tolerance (VDD and VDDQ), robust input thresholds, and ZZ sleep-mode data retention make it suitable for deployment in uncontrolled thermal environments such as base station line cards and factory automation controllers.