Renesas 71V65803S100PFGI

Overview

71V65803S100PFGI from Renesas Electronics is a 3.3V synchronous ZBT™ SRAM with 256K × 36-bit (9,437,184-bit) organization, 150 MHz clock frequency, 3.8 ns clock-to-data access time, and zero bus turnaround (ZBT) architecture enabling dead-cycle-free read/write transitions. It operates across industrial temperature range (–40°C to +85°C) and supports pipelined burst reads/writes in linear or interleaved sequences for high-throughput memory subsystems in network switches and telecom line cards.

For engineers reviewing the 71V65803S100PFGI datasheet, 71V65803S100PFGI pinout, 71V65803S100PFGI application, or 71V65803S100PFGI equivalent, this page delivers verified package mapping (100-pin TQFP), confirmed ZBT timing behavior, burst counter control via ADV/LD and LBO, individual byte write (BW1–BW4), and industrial-grade power sequencing compliance - all critical for deterministic latency-critical designs.

Technical Context

The 71V65803S100PFGI implements a fully synchronous, positive-edge-triggered interface with registered address, control, and data paths. Its internal burst counter advances on ADV/LD = HIGH and loads new addresses on ADV/LD = LOW, supporting 4-word bursts with selectable linear or interleaved order via static LBO pin.

ZBT operation eliminates bus turnaround latency by allowing immediate read-after-write or write-after-read transitions without wait states. Output enable (OE) is asynchronous but internally synchronized via pipelined output registers, while clock enable (CEN) suspends all synchronous logic without affecting output state.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, lead pitch 0.5 mm. Pin 1 marked via corner notch; top-side marking includes "71V65803S100PFGI" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371DV33-133AXC and AS7C33256P-15JCIN, the 71V65803S100PFGI uniquely delivers true zero-bus-turnaround operation via dedicated ADV/LD and LBO controls - enabling uninterrupted 150 MHz burst streaming essential for packet buffering and real-time signal processing.

Availability

71V65803S100PFGI is available at Aetrix Electronics and suitable for network packet buffers, telecom line card memory, and high-speed test equipment requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for 71V65803S100PFGI 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 71V65803S100PFGI belongs to Renesas' high-performance ZBT™ SRAM product line, engineered specifically for latency-critical, high-throughput memory subsystems in networking, telecom, and test instrumentation where deterministic timing and bus efficiency are paramount.

FAQ

What is the maximum operating frequency and access time of the 71V65803S100PFGI?

The 71V65803S100PFGI supports a maximum clock frequency of 150 MHz with a guaranteed clock-to-data access time (tCD) of 3.8 ns. This specification is valid under industrial temperature conditions (–40°C to +85°C) and 3.3 V ±5% supply voltage. The 3.8 ns value reflects the delay from CLK rising edge to valid data on I/O pins during a read cycle initiated two clocks earlier.

How does the ZBTTM feature eliminate dead cycles in the 71V65803S100PFGI?

The ZBTTM feature in the 71V65803S100PFGI allows immediate transition from a write cycle to a read cycle (or vice versa) without inserting idle bus cycles. This is achieved through internal pipelining and dual-phase control logic that decouples address/control registration from data transfer timing - enabling back-to-back operations at full 150 MHz rate without arbitration overhead.

What are the burst sequence options supported by the 71V65803S100PFGI and how are they selected?

The 71V65803S100PFGI supports two 4-word burst orders: linear (0,1,2,3) and interleaved (0,2,1,3). Selection is controlled by the static LBO pin: LBO = LOW configures linear mode; LBO = HIGH configures interleaved mode. The burst counter advances on ADV/LD = HIGH and loads new base addresses on ADV/LD = LOW, ensuring predictable address progression.

Can the 71V65803S100PFGI operate with different supply voltages for core and I/O rails?

Yes - the 71V65803S100PFGI requires separate 3.3 V ±5% supplies: VDD for core logic and VDDQ for I/O circuitry. This separation maintains signal integrity and noise immunity, especially important in mixed-signal systems. Both rails must be powered simultaneously during operation; VDDQ must not exceed VDD + 0.5 V per absolute maximum ratings.

What is the function of the ADV/LD pin in the 71V65803S100PFGI and how does it interact with burst operations?

The ADV/LD pin in the 71V65803S100PFGI serves dual functions: when sampled LOW at the rising CLK edge, it loads a new external address into the internal address register; when sampled HIGH, it advances the internal burst counter. This enables seamless burst initiation and continuation without external address generation logic - a key enabler of the ZBT™ architecture's efficiency.