Renesas 71V3556S133PFG8

Overview

71V3556S133PFG8 from Renesas is a 3.3V, 128K × 36-bit (4.5 Mbit) synchronous ZBT™ SRAM with zero bus turnaround, 133 MHz operation (7.5 ns clock-to-data), pipelined outputs, and 4-word burst capability. It features synchronous address/control/data registers, individual byte write enables (BW1–BW4), and three chip enables for depth expansion - deployed in high-speed packet buffering, network switch fabric, and real-time DSP memory subsystems.

For engineers reviewing the 71V3556S133PFG8 datasheet, 71V3556S133PFG8 pinout, 71V3556S133PFG8 application, or 71V3556S133PFG8 equivalent, key selection criteria include ZBT™ timing compliance, 100-pin TQFP package compatibility, industrial temperature support (–40°C to +85°C), and JTAG boundary-scan readiness (optional IEEE 1149.1).

Technical Context

The 71V3556S133PFG8 implements a fully synchronous, rising-edge-triggered architecture with two-cycle read/write latency: address/control registration occurs on cycle N, data transfer completes on cycle N+2. Its internal burst counter supports linear or interleaved 4-word sequences controlled by the LBO pin, while ADV/LD determines whether external address load or internal counter advance occurs.

ZBT™ operation eliminates dead cycles between consecutive reads and writes via internally synchronized output buffer enable - removing need for external OE control. The device integrates three chip enables (CE1, CE2 active-low; CE2 active-high), sleep mode (ZZ), and optional JTAG test interface compliant with IEEE 1149.1.

Key Specifications

Pinout & Package

71V3556S133PFG8 is packaged in a JEDEC-standard 100-pin TQFP (PKG100), 14 mm × 20 mm body, 0.5 mm pitch, with exposed thermal pad (not electrically connected). Pin 1 marked by corner notch; top-side marking includes "71V3556S", speed grade "133", and package code "PFG".

Key Features

Applications

Equivalent & Alternatives

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

Compared with 71V3556S133PFG8, the SA variant adds test infrastructure without altering performance or footprint, while the AS7C3256B sacrifices ZBT™ and byte-write granularity for lower unit cost and simpler interface - making it viable only in non-real-time buffering roles.

Availability

71V3556S133PFG8 is available at Aetrix Electronics and suitable for high-speed networking, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle assurance, and industrial-grade temperature compliance.

Supply support for 71V3556S133PFG8 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 communications markets.

The 71V3556S133PFG8 belongs to Renesas' ZBT™ SRAM product line, engineered specifically for zero-latency memory subsystems in high-throughput switching, routing, and real-time signal processing systems.

FAQ

What is the maximum operating frequency of the 71V3556S133PFG8?

The 71V3556S133PFG8 is rated for 133 MHz operation across the full industrial temperature range (–40°C to +85°C), delivering a 7.5 ns clock period and guaranteed 7.5 ns clock-to-data access time (tCD). This frequency is validated under worst-case VDD = 3.135 V, VDDQ = 3.135 V conditions with proper PCB layout and decoupling.

Does the 71V3556S133PFG8 support burst read and write operations?

Yes, the 71V3556S133PFG8 supports 4-word synchronous burst operations in both linear and interleaved sequences, controlled by the LBO pin. Burst initiation requires ADV/LD = HIGH after initial address load, and the internal counter advances automatically - eliminating need for external address generation logic during burst cycles.

How does the ZBT™ feature eliminate bus turnaround cycles in the 71V3556S133PFG8?

The 71V3556S133PFG8 implements ZBT™ by synchronizing output buffer enable internally - removing dependence on asynchronous OE control. This allows immediate transition from write to read (or vice versa) on consecutive clock edges without tri-state bus recovery time, achieving true zero-cycle turnaround in pipelined systems.

What is the function of the ZZ pin on the 71V3556S133PFG8?

The ZZ pin on the 71V3556S133PFG8 is a synchronous sleep mode input. When driven HIGH, it gates the internal clock and reduces power consumption to its lowest level while maintaining full data retention. Exit from sleep mode is synchronous and requires two clock cycles before normal operation resumes.

Is the 71V3556S133PFG8 pin-compatible with other members of the 71V3556/58 family?

Yes, the 71V3556S133PFG8 shares identical pinout and package (100-pin TQFP) with 71V3556SA133PFG8 and 71V3558S133PFG8. The 71V3558 variant differs only in memory organization (256K × 18), using the same address/control/data pin assignments and timing behavior - enabling drop-in replacement in width-flexible designs.