Renesas 71V3556SA166BGGI8

Overview

71V3556SA166BGGI8 from IDT (now Renesas) is a 128K × 36-bit, 4.5 Mbit, 3.3V synchronous ZBT™ SRAM with zero bus turnaround, 166 MHz operation (3.5 ns clock-to-data access), pipelined outputs, and JTAG boundary scan support. It serves as high-speed cache or buffer memory in networking switches, telecom line cards, and packet processing engines requiring deterministic latency and burst data throughput.

For engineers reviewing the 71V3556SA166BGGI8 datasheet, 71V3556SA166BGGI8 pinout, 71V3556SA166BGGI8 application, or 71V3556SA166BGGI8 equivalent, key selection criteria include ZBT™ bus turnaround elimination, 4-word interleaved/linear burst capability, individual byte write control (BW1–BW4), industrial temperature range (–40°C to +85°C), and BGA-119 package compatibility with JEDEC-standard layout.

Technical Context

The 71V3556SA166BGGI8 implements a fully synchronous, pipelined architecture where address/control registration occurs on the rising edge of CLK, with data output valid two cycles later. Its ZBT™ feature eliminates dead cycles between read/write transitions by decoupling bus direction control from OE and using internal synchronization of output buffers.

It integrates a 4-word burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved addressing sequences. The device includes three chip enables (CE1, CE2, CE2) for depth expansion, optional IEEE 1149.1 JTAG boundary scan (TMS/TDI/TCK/TDO/TRST), and synchronous sleep mode (ZZ) for power reduction while retaining data.

Key Specifications

Pinout & Package

71V3556SA166BGGI8 is packaged in a 119-ball fine-pitch BGA (BGG119) per JEDEC MO-207AD, with 1.0 mm ball pitch, 14 mm × 14 mm body size, and industrial-grade thermal performance.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV18-166BZI and AS7C33128PFSI-166BIN, the 71V3556SA166BGGI8 uniquely delivers 36-bit ZBT™ operation with integrated JTAG and per-byte write control-enabling higher bandwidth, lower latency, and enhanced testability in mission-critical infrastructure.

Availability

71V3556SA166BGGI8 is available at Aetrix Electronics and suitable for networking switch fabric, telecom line card buffer, packet processing engine cache, and radar signal processing memory applications requiring stable component supply, long-term lifecycle support, and industrial temperature reliability.

Supply support for 71V3556SA166BGGI8 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 semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71V3556SA166BGGI8 belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency bus turnaround in high-throughput packet-forwarding and real-time signal processing systems.

FAQ

What is the memory configuration and total capacity of the 71V3556SA166BGGI8?

The 71V3556SA166BGGI8 is configured as 128K × 36-bit, delivering a total capacity of 4,718,592 bits (4.5 Mbit). This organization supports 36-bit parallel data paths commonly used in high-end networking ASICs and DSP interfaces, and is distinct from the 256K × 18-bit variant offered in the same family.

Does the 71V3556SA166BGGI8 support JTAG boundary scan, and which pins are used?

Yes, the 71V3556SA166BGGI8 supports IEEE 1149.1 JTAG boundary scan. Pins TMS, TDI, TCK, TDO, and optional TRST are dedicated to this function and are assigned to specific balls in the BGG119 package. TRST is pulled up internally and may be left floating if unused.

How does the ZBT™ feature of the 71V3556SA166BGGI8 eliminate bus turnaround delays?

The ZBT™ feature in the 71V3556SA166BGGI8 removes dead cycles between read and write operations by internally synchronizing the output buffer enable signal-eliminating the need for external OE control and allowing immediate bus direction reversal. This results in continuous data flow without wait states.

What are the burst addressing modes supported by the 71V3556SA166BGGI8, and how is selection controlled?

The 71V3556SA166BGGI8 supports both linear and interleaved 4-word burst sequences. The LBO (Linear Burst Order) pin determines mode: LOW selects linear, HIGH selects interleaved. This static configuration must be set before operation and remains fixed during burst execution.

What is the role of the ADV/LD pin in the 71V3556SA166BGGI8, and how does it interact with burst operations?

The ADV/LD pin controls whether the internal burst counter advances (HIGH) or loads a new external address (LOW). During burst reads/writes, sampling ADV/LD HIGH increments the counter automatically, enabling sequential access without reissuing addresses-reducing bus overhead and improving throughput efficiency.