Renesas 71V65603S100PFG

Overview

71V65603S100PFG from Renesas Electronics is a 3.3V synchronous ZBT™ SRAM with 256K × 36-bit (9-Mbit) organization, 150 MHz operation (3.8 ns clock-to-data access), zero bus turnaround (ZBT) architecture, and pipelined outputs. It supports interleaved/linear 4-word burst reads/writes and operates across industrial temperature (–40°C to +85°C) in a 100-pin TQFP package - used in high-speed packet buffering for network switches and routers.

For engineers reviewing the 71V65603S100PFG datasheet, 71V65603S100PFG pinout, 71V65603S100PFG application, or 71V65603S100PFG equivalent, key selection criteria include ZBT timing compliance, 3.3V I/O compatibility, burst counter control via ADV/LD and LBO, and support for individual byte write (BW1–BW4) in memory subsystems requiring low-latency read/write transitions.

Technical Context

The 71V65603S100PFG implements a fully synchronous, clock-edge-triggered architecture where address, control, and data are registered on the rising edge of CLK. Its ZBT feature eliminates dead cycles between consecutive read/write operations by overlapping bus turnaround with internal memory access.

It integrates a 4-word burst counter controlled by ADV/LD (load new address or increment counter) and LBO (linear vs. interleaved sequence), with pipelined input/output registers ensuring deterministic 2-cycle latency from address/control registration to data output. OE is asynchronous but internally synchronized for glitch-free output disable.

Key Specifications

Pinout & Package

71V65603S100PFG is packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body size, with 0.5 mm pitch and exposed thermal pad (per PKG100 footprint).

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 71V65603S100PFG offers native ZBT burst control with single R/W pin and simpler timing closure, while AS7C33128PFS-15BIN provides direct pin-and-function compatibility for supply chain resilience.

Availability

71V65603S100PFG is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, baseband processing cache, and industrial PLC data logging requiring stable component supply, long-lifecycle support, and industrial-temperature qualification.

Supply support for 71V65603S100PFG 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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and communications markets.

The 71V65603S100PFG belongs to Renesas' high-speed ZBT SRAM product line, engineered specifically for low-latency, burst-oriented memory subsystems in networking and telecom infrastructure where deterministic timing and bus efficiency are critical.

FAQ

What is the maximum operating frequency and corresponding clock-to-data access time for the 71V65603S100PFG?

The 71V65603S100PFG operates at up to 150 MHz with a typical clock-to-data access time of 3.8 ns. This specification is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±5% supply conditions. The timing is measured from the rising edge of CLK to valid data appearing on the I/O bus after a read command, reflecting its pipelined output register architecture.

How does the ZBTTM feature eliminate dead cycles between read and write operations in the 71V65603S100PFG?

The ZBTTM feature in the 71V65603S100PFG allows immediate transition from a write cycle to a read cycle (or vice versa) without bus idle time. This is achieved by overlapping the internal memory array access with bus direction change - the device initiates the next operation's address setup while completing the current data transfer. As a result, consecutive burst cycles execute back-to-back at full 150 MHz, maximizing effective bandwidth in packet-processing applications.

What are the voltage requirements for VDD and VDDQ on the 71V65603S100PFG, and are they interchangeable?

The 71V65603S100PFG requires VDD = 3.3 V ±5% for core logic and VDDQ = 3.3 V ±5% for I/O drivers. These supplies are not interchangeable: VDD powers internal registers and control logic, while VDDQ independently biases the output buffers and input receivers to ensure clean signal integrity at 150 MHz. Separating them allows independent decoupling and noise isolation - mandatory for stable high-speed operation.

Can the 71V65603S100PFG support partial-word writes, and how are byte write controls implemented?

Yes, the 71V65603S100PFG supports partial-word writes via four dedicated byte write enable pins: BW1, BW2, BW3, and BW4. Each controls a 9-bit segment (I/O[0:7]+I/OP1 through I/O[24:31]+I/OP4). When asserted low during a write cycle, the corresponding byte is updated; high states mask that byte. This enables efficient protocol header modification or status flag updates without full-word read-modify-write sequences - reducing latency and bus contention.

What package type and pin count does the 71V65603S100PFG use, and is it compatible with standard reflow profiles?

The 71V65603S100PFG uses a JEDEC-standard 100-pin thin quad flatpack (TQFP) with 14 mm × 20 mm body size and 0.5 mm lead pitch. It is qualified for standard Pb-free reflow soldering per IPC/JEDEC J-STD-020, including peak temperatures up to 260°C. The package includes an exposed thermal pad (not electrically connected) to aid heat dissipation during sustained 150 MHz operation.