Renesas 71V65903S85BGG

Overview

71V65903S85BGG 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 between read/write cycles, and flow-through outputs. It serves as a high-bandwidth buffer or cache in network packet processors, telecom line cards, and FPGA-based data-path subsystems requiring deterministic burst transfers.

For engineers reviewing the 71V65903S85BGG datasheet, 71V65903S85BGG pinout, 71V65903S85BGG application, or 71V65903S85BGG equivalent, key selection criteria include its 100 MHz synchronous interface, 4-word interleaved/linear burst capability, individual byte write control (BW1–BW2), industrial temperature support (–40°C to +85°C), and JEDEC-standard 119-ball BGA (BGG) package compatibility.

Technical Context

The 71V65903S85BGG implements a synchronous dual-edge-triggered architecture with an on-chip burst counter and ADV/LD-controlled address loading or incrementing. Its flow-through output path eliminates output register delay, while internally synchronized OE removes external timing constraints on output enable control.

ZBT™ operation is enforced via strict sequencing: write-to-read or read-to-write transitions occur without dead cycles by leveraging the burst counter, LBO-configurable burst order (interleaved or linear), and three chip enables (CE1, CE2 active-low; CE2 active-high) for depth expansion. Clock Enable (CEN) suspends all synchronous logic while preserving register state.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 119-ball fine-pitch ball grid array (BGG), the 71V65903S85BGG uses a 12 × 12 mm footprint with 0.8 mm pitch and perimeter I/O arrangement optimized for high-speed signal integrity and thermal dissipation in dense PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371DV33-100AXC and AS7C35128PFS-100BIN, the 71V65903S85BGG uniquely delivers zero bus turnaround with programmable burst order-making it optimal for high-efficiency sequential data paths in networking and real-time control where deterministic latency outweighs raw bandwidth.

Availability

71V65903S85BGG is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor caching, telecom line card FIFOs, and industrial motion controller buffers requiring stable component supply across extended product lifecycles.

Supply support for 71V65903S85BGG 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 fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications and computing infrastructure.

The 71V65903S85BGG belongs to IDT's ZBT™ SRAM product line, engineered specifically for low-latency, high-throughput data buffering in packet-switched networks, baseband processing, and real-time embedded systems demanding deterministic burst behavior.

FAQ

What is the maximum operating frequency and corresponding access time for the 71V65903S85BGG?

The 71V65903S85BGG operates at a maximum clock frequency of 100 MHz, with a guaranteed clock-to-data access time of 7.5 ns. This specification is valid across the full industrial temperature range (–40°C to +85°C) and under recommended 3.3 V ±5% supply conditions. The 71V65903S85BGG achieves this performance using a flow-through output architecture and synchronous register-controlled inputs.

Does the 71V65903S85BGG support burst reads and writes, and how is burst order configured?

Yes, the 71V65903S85BGG supports 4-word synchronous bursts in both read and write operations. Burst order is selected via the LBO (Linear/Interleaved Burst Order) pin: LBO = VSS configures linear addressing (A0, A1, A2, A3), while LBO = VDD selects interleaved order (A0, A2, A1, A3). The 71V65903S85BGG uses ADV/LD to load the initial address or advance the internal burst counter, enabling efficient sequential access without external address generation.

How does the ZBTTM (Zero Bus Turnaround) feature function in the 71V65903S85BGG?

ZBTTM in the 71V65903S85BGG eliminates idle bus cycles between consecutive read and write operations by overlapping address setup and data transfer phases. When transitioning from a write burst to a read burst (or vice versa), the 71V65903S85BGG uses its internal burst counter and ADV/LD control to initiate the next operation immediately-no wait states or bus release/reacquisition are required, maintaining continuous 100 MHz throughput.

What package type and pin count does the 71V65903S85BGG use, and is it RoHS compliant?

The 71V65903S85BGG is packaged in a 119-ball fine-pitch ball grid array (BGG) with 0.8 mm pitch and 12 mm × 12 mm body size, conforming to JEDEC MO-251 standards. It is a green (RoHS-compliant) part, meeting lead-free soldering requirements and environmental regulations. Pin assignments are optimized for signal integrity, with dedicated VDDQ/VSS pairs adjacent to I/O banks and separate core power domains.

Can the 71V65903S85BGG operate in low-power modes, and how is sleep mode controlled?

Yes, the 71V65903S85BGG supports low-power sleep mode via the asynchronous ZZ input. When ZZ is driven HIGH, the internal clock is gated, reducing dynamic power consumption significantly while guaranteeing data retention across the full industrial temperature range. The 71V65903S85BGG exits sleep mode synchronously on the next rising CLK edge after ZZ returns LOW, with no reset or initialization sequence required.