Renesas 71V65603S100BG

Overview

71V65603S100BG from Renesas Electronics is a 3.3V synchronous ZBT™ SRAM with 256K × 36-bit organization (9,437,184 bits), 150 MHz maximum clock frequency, 3.8 ns clock-to-data access time, and zero bus turnaround (ZBT) architecture enabling immediate read-after-write transitions without dead cycles. It operates across industrial temperature range (–40°C to +85°C) and is used in high-speed packet buffering, network switch fabric control, and real-time DSP memory subsystems.

For engineers reviewing the 71V65603S100BG datasheet, 71V65603S100BG pinout, 71V65603S100BG application, or 71V65603S100BG equivalent, key selection criteria include its pipelined synchronous interface, 4-word burst capability (linear/interleaved), individual byte write enables (BW1–BW4), three-chip-enable depth expansion support, and JEDEC-standard 100-pin TQFP package with 14 mm × 20 mm footprint.

Technical Context

The 71V65603S100BG implements a fully pipelined synchronous architecture where address/control signals are registered on the rising edge of CLK, and data transfers occur two cycles later. Its ZBT™ feature eliminates bus turnaround latency by allowing consecutive reads and writes without idle cycles, enabled by internal burst counter and ADV/LD-controlled address loading or incrementing.

It supports dual-mode burst sequencing via static LBO input (linear or interleaved), asynchronous OE for output tri-state control, and ZZ input for low-power sleep mode. All synchronous inputs-including R/W, CEN, CE1/CE2/CE2, BWx, and ADV/LD-meet setup/hold timing relative to CLK, while OE and ZZ operate asynchronously.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch, lead-free and RoHS-compliant. Pin 1 marked via corner notch or dot; top-side marking includes "71V65603S100BG" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-133AXC and AS7C33128PFS-15BIN, the 71V65603S100BG delivers superior timing headroom (3.8 ns vs. ≥4.5 ns), flexible burst sequencing (LBO-selectable), and hardware sleep mode-making it optimal for latency-constrained, power-aware, and protocol-diverse systems.

Availability

71V65603S100BG is available at Aetrix Electronics and suitable for network packet buffering, switch fabric control memory, and real-time industrial controller memory requiring stable component supply, long-term lifecycle support, and guaranteed industrial-grade performance.

Supply support for 71V65603S100BG 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

Renesas Electronics is a global semiconductor leader specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71V65603S100BG belongs to Renesas' high-speed ZBT™ SRAM product line, engineered specifically for zero-latency, burst-capable memory subsystems in networking, telecom, and real-time embedded systems.

FAQ

What is the memory organization and total capacity of the 71V65603S100BG?

The 71V65603S100BG is configured as 256K × 36-bit, delivering a total capacity of 9,437,184 bits (9.4 Mbit). This organization provides a 36-bit wide data bus ideal for applications requiring high-throughput parallel access, such as network ASIC interfacing and DSP co-processing. The part does not support 512K × 18-bit configuration-only the 256K × 36-bit variant is implemented in the 71V65603S100BG.

Does the 71V65603S100BG support both linear and interleaved burst modes?

Yes, the 71V65603S100BG supports both linear and interleaved 4-word burst sequences via the static LBO (Linear/Interleaved Burst Order) input pin. When LBO = LOW, the burst follows linear order (A0, A0+1, A0+2, A0+3); when LBO = HIGH, it follows interleaved order (A0, A0+2, A0+1, A0+3). This flexibility allows optimization for specific memory access patterns in switch fabric or cache controller designs.

What is the function of the ADV/LD pin on the 71V65603S100BG?

The ADV/LD pin on the 71V65603S100BG serves a dual role: when sampled LOW at the rising CLK edge, it loads a new external address into the internal register; when sampled HIGH, it advances the internal burst counter. This enables seamless transition between single-address load cycles and multi-cycle burst operations-critical for maintaining continuous data flow in high-speed packet processing applications.

How does the ZBTTM feature improve system performance in the 71V65603S100BG?

The ZBTTM (Zero Bus Turnaround) feature in the 71V65603S100BG eliminates idle cycles between consecutive read and write operations. Unlike conventional SRAMs that require bus turnaround time, the 71V65603S100BG allows immediate back-to-back read-after-write or write-after-read transitions-directly increasing effective bandwidth and reducing latency in burst-intensive applications like network switch buffers and real-time control loops.

Can the 71V65603S100BG operate in low-power mode, and how is it controlled?

Yes, the 71V65603S100BG supports low-power sleep mode via the asynchronous ZZ input pin. When ZZ is driven HIGH, the internal clock is gated and the device enters its lowest power consumption state while retaining stored data. Power resumes automatically upon ZZ returning LOW, with no initialization delay-making it suitable for energy-conscious systems with intermittent activity patterns.