Renesas 71V3558S166PFG8

Overview

71V3558S166PFG8 from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM with 128K × 36-bit organization, 166 MHz clock speed, 3.5 ns clock-to-data access, zero bus turnaround architecture, and pipelined outputs. It supports interleaved/linear 4-word burst reads/writes and individual byte write control (BW1–BW4), deployed in high-throughput packet buffering and network switch fabric applications.

For engineers reviewing the 71V3558S166PFG8 datasheet, 71V3558S166PFG8 pinout, 71V3558S166PFG8 application, or 71V3558S166PFG8 equivalent, key selection criteria include ZBT™ dead-cycle elimination, 100-pin TQFP package compatibility, industrial temperature support (–40°C to +85°C), and JTAG boundary-scan capability in SA variants - all critical for telecom infrastructure and real-time embedded memory subsystems.

Technical Context

The 71V3558S166PFG8 implements a fully synchronous, positive-edge-triggered register pipeline for address, control, and data I/O signals, with two-cycle latency between address/control registration and data transfer. Its ZBT™ architecture eliminates bus turnaround dead cycles by enabling immediate read-after-write or write-after-read transitions without OE control overhead.

It integrates an on-chip burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved 4-word burst sequences. The device features three chip enables (CE1, CE2, CE2) with two-cycle deselect timing, asynchronous OE for output tri-state control, and optional IEEE 1149.1 JTAG boundary scan (available in SA versions only).

Key Specifications

Pinout & Package

71V3558S166PFG8 is packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body size, with exposed thermal pad (PFG suffix). Pinout validated per IDT document 5281 drw 02 (128K×36 configuration).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1356BV18-167BZC and AS7C3256A-15JIN, the 71V3558S166PFG8 delivers unique ZBT™ dead-cycle elimination and integrated burst counter-enabling true zero-gap memory transactions essential for packet-switched and real-time signal processing workloads.

Availability

71V3558S166PFG8 is available at Aetrix Electronics and suitable for network switch fabric design, telecom baseband processing, real-time signal buffering, and industrial PLC data logging requiring stable component supply across extended product lifecycles.

Supply support for 71V3558S166PFG8 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 fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications and computing infrastructure.

The 71V3558S166PFG8 belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency memory subsystems in packet-forwarding engines, switch fabrics, and real-time DSP buffers where bus efficiency and deterministic timing are critical.

FAQ

What is the memory organization and density of the 71V3558S166PFG8?

The 71V3558S166PFG8 is configured as 128K × 36-bit, delivering 4,718,592 bits (4.5 Mbit) of synchronous SRAM. This organization supports 36-bit data paths common in network processors and DSP interfaces, and enables depth expansion using its three chip enable pins (CE1, CE2, CE2) without external decoding logic.

Does the 71V3558S166PFG8 support burst read and write operations?

Yes, the 71V3558S166PFG8 supports 4-word burst operations in both linear and interleaved sequences, controlled by the LBO pin and advanced via the ADV/LD signal. Burst mode reduces address bus activity by 75% per transaction and is fully supported for both reads and writes, with data appearing two clock cycles after the initial address load.

What is the role of the ZZ pin on the 71V3558S166PFG8?

The ZZ pin on the 71V3558S166PFG8 is a synchronous sleep mode input. When asserted HIGH, it gates the internal clock and places the device into its lowest-power state while guaranteeing data retention. This feature is essential for power-constrained telecom and industrial applications requiring rapid wake-up with no data loss.

Is JTAG boundary scan available on the 71V3558S166PFG8?

JTAG boundary scan (IEEE 1149.1) is not available on the standard "S" version of the 71V3558S166PFG8. It is only implemented in the "SA" variant (e.g., 71V3558SA), which includes dedicated TMS, TDI, TCK, TDO, and optional TRST pins. The 71V3558S166PFG8 uses NC pins in those locations per its 100-pin TQFP pinout.

What are the voltage and temperature specifications for the 71V3558S166PFG8?

The 71V3558S166PFG8 operates with VDD and VDDQ at 3.3 V ±5%, and is rated for industrial temperature range (–40°C to +85°C). Absolute maximum ratings specify terminal voltages up to VDD +0.5 V for I/O pins and –0.5 V to +4.6 V for other terminals, ensuring robustness in noisy industrial environments.