Renesas 71V65903S80BQG

Overview

71V65903S80BQG 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, and flow-through outputs. It serves as high-speed buffer/cache memory in networking switches, packet processors, and FPGA-based data-path systems requiring burst reads/writes without dead cycles.

For engineers reviewing the 71V65903S80BQG datasheet, 71V65903S80BQG pinout, 71V65903S80BQG application, or 71V65903S80BQG equivalent, key selection criteria include its 100 MHz timing, 4-word interleaved/linear burst capability, individual byte write control (BW1–BW2), asynchronous ZZ sleep mode, and JEDEC-standard 165-ball fine-pitch BGA (BQG) package compatibility.

Technical Context

The 71V65903S80BQG implements a synchronous dual-edge-triggered interface with registered address/control inputs and flow-through data outputs-no output register-enabling deterministic 1-cycle latency for read data. Its on-chip burst counter advances on ADV/LD = HIGH, with LBO selecting linear or interleaved sequence.

Three chip enables (CE1, CE2 active-low; CE2 active-high) support depth expansion, while CEN suspends all synchronous operation without affecting output state. The device uses separate VDD (3.3V ±5%) and VDDQ (3.3V ±5%) supplies, and supports industrial temperature range (–40°C to +85°C) with guaranteed data retention in ZZ sleep mode.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 165-ball fine-pitch ball grid array (fBGA), designated BQG165, with 1.0 mm ball pitch and 13 mm × 15 mm body size. Pinout optimized for signal integrity: dedicated VSS/VDDQ pairs adjacent to I/O banks, and power/ground balls distributed across all four quadrants.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1354BV33-100AXC and AS7C35128P-10BIN, the 71V65903S80BQG delivers deterministic 7.5 ns read latency with zero bus turnaround-enabling simpler controller design and higher effective bandwidth in burst-limited applications like packet switching and real-time buffering.

Availability

71V65903S80BQG is available at Aetrix Electronics and suitable for networking infrastructure, FPGA-based instrumentation, telecom line cards, and industrial data loggers requiring stable component supply across extended product lifecycles.

Supply support for 71V65903S80BQG 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 71V65903S80BQG belongs to IDT's ZBT™ SRAM family, engineered specifically for zero-latency, high-bandwidth data buffering in packet-switched networks and real-time digital signal processing systems.

FAQ

What is the exact memory organization and capacity of the 71V65903S80BQG?

The 71V65903S80BQG is organized as 512K x 18, delivering 9,437,184 bits (9.4 Mbit) of synchronous SRAM. It uses 19 address lines (A0–A18), though only A0–A17 are functional for 512K addressing; A18 is no-connect in this configuration. This layout supports efficient depth expansion using the three chip enable pins (CE1, CE2, CE2).

Does the 71V65903S80BQG support both linear and interleaved burst modes?

Yes, the 71V65903S80BQG supports both burst sequences via the LBO (Linear/Interleaved Burst Order) pin. When LBO = LOW, it executes linear bursts (e.g., A0, A1, A2, A3); when LBO = HIGH, it uses interleaved order (e.g., A0, A2, A1, A3). This flexibility allows optimization for sequential data streams or cache-line-aligned access patterns in the 71V65903S80BQG's target applications.

How does the ZBTTM feature eliminate dead cycles in the 71V65903S80BQG?

ZBTTM (Zero Bus Turnaround) in the 71V65903S80BQG removes the traditional bus idle period between consecutive read and write operations. By overlapping address setup for the next cycle with data transfer of the current cycle-and using internal synchronization-the 71V65903S80BQG achieves back-to-back access with no wasted clock cycles, directly improving effective bandwidth in high-throughput buffering.

What is the role of the ZZ pin on the 71V65903S80BQG, and how does it affect power consumption?

The ZZ pin on the 71V65903S80BQG is an asynchronous sleep mode input. When asserted HIGH, it gates the internal clock and places the device in ultra-low-power retention mode (<100 µA typical), while preserving all stored data. This feature is essential for power-sensitive telecom and industrial applications where the 71V65903S80BQG may idle between data bursts without losing context.

Can the 71V65903S80BQG be used with a 3.3V-only system, or does it require separate VDD and VDDQ supplies?

The 71V65903S80BQG requires both VDD (core supply) and VDDQ (I/O supply), each rated at 3.3V ±5%. While they may be tied together in cost-sensitive designs, the datasheet specifies separate decoupling and recommends independent regulation to minimize noise coupling between core logic and I/O drivers-especially critical for maintaining signal integrity at 100 MHz operation in the 71V65903S80BQG.