Renesas 71V3558S166PFG

Overview

71V3558S166PFG from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM with 128K × 36-bit organization (4.5 Mbit), 166 MHz clock frequency, 3.5 ns clock-to-data access time, zero bus turnaround architecture, and pipelined outputs. It operates in industrial temperature range (–40°C to +85°C) and is packaged in a 100-pin TQFP for high-speed cache and buffer applications in networking and telecom equipment.

For engineers reviewing the 71V3558S166PFG datasheet, 71V3558S166PFG pinout, 71V3558S166PFG application, or 71V3558S166PFG equivalent, key selection criteria include ZBT™ burst capability (linear/interleaved), individual byte write control (BW1–BW4), three chip enables for depth expansion, JTAG boundary scan support (IEEE 1149.1), and sleep mode (ZZ) for power management.

Technical Context

The 71V3558S166PFG implements a fully synchronous, pipelined architecture where address/control signals are registered on the rising edge of CLK, and data transfers occur two cycles later. Its ZBT™ feature eliminates dead cycles between read and write operations by enabling immediate bus turnaround without OE control.

It integrates an on-chip 4-word burst counter controlled by ADV/LD and LBO pins, supports interleaved or linear burst sequences, and includes asynchronous OE for output tri-state control. The device uses separate VDD (3.3V core) and VDDQ (3.3V I/O) supplies and features a synchronous sleep mode (ZZ) that gates the internal clock while retaining data.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, lead pitch 0.5 mm. Pin 64 supports ZZ (sleep mode) on latest die revision; pins 14, 16, and 66 tolerate VIH-level input without direct VDD connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355KV18-166BZC and AS7C3256A-166JCIN, the 71V3558S166PFG uniquely delivers 36-bit width, ZBT™ bus efficiency, and integrated burst control - reducing external glue logic and improving sustained bandwidth in high-clock-frequency systems.

Availability

71V3558S166PFG is available at Aetrix Electronics and suitable for high-speed network switch buffers, telecom line card caches, and industrial PLC real-time data loggers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 71V3558S166PFG 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, computing, and industrial markets.

The 71V3558S166PFG belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency bus turnaround in packet-switched infrastructure where deterministic timing and burst efficiency are mandatory.

FAQ

What is the memory organization and total capacity of the 71V3558S166PFG?

The 71V3558S166PFG 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 high-end networking ASICs and DSP interfaces, with address lines A0–A16 fully utilized and A17 reserved for future expansion or 256K×18 mode compatibility.

Does the 71V3558S166PFG support burst read and write operations, and how is burst order selected?

Yes, the 71V3558S166PFG supports 4-word burst operations in both read and write modes. Burst sequence order - linear or interleaved - is selected via the LBO pin: LBO = LOW selects linear order, LBO = HIGH selects interleaved order. The burst counter advances synchronously on each rising CLK edge when ADV/LD is HIGH.

How does the ZBTTM feature eliminate dead cycles between read and write operations in the 71V3558S166PFG?

The ZBTTM (Zero Bus Turnaround) feature in the 71V3558S166PFG removes the need for idle cycles by allowing immediate transition from read to write (or vice versa) within the same clock domain. This is achieved through internal synchronization of OE and bus direction control, eliminating external OE timing constraints and enabling continuous data flow in full-duplex bus systems.

What are the power supply requirements and voltage tolerances for the 71V3558S166PFG?

The 71V3558S166PFG requires two independent 3.3 V supplies: VDD (core logic, 3.3 V ±5%) and VDDQ (I/O drivers, 3.3 V ±5%). Absolute maximum ratings allow VDD/VDDQ up to +3.465 V and minimum down to +3.135 V. Input voltage thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V, ensuring robust noise margin in electrically noisy environments.

Is JTAG boundary scan supported on the 71V3558S166PFG, and which package options include it?

JTAG boundary scan (IEEE 1149.1) is optional and implemented only in BGA package variants (119-ball and 165-fBGA) of the 71V3558S166PFG - not in the 100-pin TQFP package. Signals TMS, TDI, TCK, TDO, and optional TRST are assigned to dedicated pins in BGA versions; the "S" suffix indicates non-JTAG TQFP, while "SA" denotes JTAG-enabled versions in BGA.