Renesas 71V65903S85BGGI

Overview

71V65903S85BGGI from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM organized as 512K × 18 (9,437,184-bit), supporting 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. It is used in high-speed networking buffers, packet switching ASIC interfaces, and telecom line card memory subsystems requiring deterministic latency.

For engineers reviewing the 71V65903S85BGGI datasheet, 71V65903S85BGGI pinout, 71V65903S85BGGI application, or 71V65903S85BGGI equivalent, key selection criteria include ZBT timing compliance, 100 MHz burst read/write capability, industrial temperature support (–40°C to +85°C), and compatibility with JEDEC-standard 119-ball BGA (BGG) packaging.

Technical Context

The 71V65903S85BGGI implements a synchronous, clock-driven architecture where address/control registration occurs on the rising CLK edge, and data transfer occurs one cycle later. Its internal burst counter supports linear or interleaved 4-word bursts controlled by the static LBO pin, with ADV/LD determining whether to load a new external address (low) or increment the counter (high).

ZBT operation eliminates dead cycles between read and write transitions via synchronized output buffer enable and single R/W control. The device uses three chip enables (CE1, CE2 active-low; CE2 active-high) for depth expansion, and includes asynchronous ZZ sleep mode and OE for output control - enabling low-power retention and flexible bus management in multi-SRAM systems.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 119-ball fine-pitch ball grid array (fBGA), designated BGG119 per IDT documentation. Pin pitch is 0.8 mm; package body size is 12 mm × 12 mm. This variant (71V65903S85BGGI) corresponds to the 512K × 18 configuration and uses the BG119/BGG119 footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371BV33-100AXC and AS7C35128PFS-100BIN, the 71V65903S85BGGI uniquely delivers ZBT timing, flow-through outputs, and integrated burst counter in a JEDEC BGG119 package - making it irreplaceable in legacy telecom and ASIC-coherent designs requiring strict cycle-deterministic behavior.

Availability

71V65903S85BGGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for 71V65903S85BGGI 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 and computing markets.

The 71V65903 belongs to IDT's ZBT SRAM product line, designed specifically for high-speed packet processing, network switching, and ASIC/FPGA co-processor memory interfaces demanding zero bus turnaround and deterministic latency.

FAQ

What memory organization does the 71V65903S85BGGI support?

The 71V65903S85BGGI is configured exclusively as 512K × 18 (9.4 Mbit), with 19 address lines (A0–A18) and 18 data bits plus two parity bits (I/O0–I/O17, I/OP1–I/OP2). Unlike the 71V65703, it does not support the 256K × 36 mode - this is a fixed x18 device per its BGG119 pinout and functional description.

Does the 71V65903S85BGGI support burst read and write operations?

Yes, the 71V65903S85BGGI supports 4-word synchronous bursts in both linear and interleaved sequences, controlled by the LBO pin. Burst initiation requires ADV/LD = HIGH after initial address load, and burst cycles execute automatically with internal counter advancement - reducing controller address bus burden significantly.

What is the purpose of the ZZ pin on the 71V65903S85BGGI?

The ZZ pin on the 71V65903S85BGGI is an asynchronous sleep mode input. When driven HIGH, it internally gates the CLK signal and reduces ICC to ≤10 µA while guaranteeing full data retention - enabling ultra-low-power standby in battery-backed or thermally constrained applications without external power sequencing.

How does the 71V65903S85BGGI achieve zero bus turnaround (ZBT)?

The 71V65903S85BGGI achieves ZBT through internally synchronized output buffer enable (eliminating external OE timing constraints) and a single R/W control pin that removes bus direction arbitration delays. Combined with flow-through outputs and deterministic 7.5 ns tCD, it enables immediate read-after-write or write-after-read transitions at 100 MHz without dead cycles.

Is the 71V65903S85BGGI compatible with commercial-grade systems?

No - the 71V65903S85BGGI is specified only for industrial temperature operation (–40°C to +85°C) and carries the 'I' suffix in its ordering code. It is not rated or tested for commercial 0°C to +70°C use; systems requiring commercial grade must select alternate variants such as the 71V65903S85BG or verify qualification data separately.