Renesas 71V3556S100PFGI8

Overview

71V3556S100PFGI8 from IDT (now Renesas) is a 128K × 36-bit, 4.5-Mbit, 3.3V synchronous ZBT™ SRAM with zero bus turnaround, pipelined outputs, and 4-word burst capability. It operates at 166 MHz with 3.5 ns clock-to-data access, supports linear/interleaved burst order via LBO pin, and features three chip enables for depth expansion in high-speed networking and packet buffering applications.

For engineers reviewing the 71V3556S100PFGI8 datasheet, 71V3556S100PFGI8 pinout, 71V3556S100PFGI8 application, or 71V3556S100PFGI8 equivalent, key selection criteria include ZBT™ dead-cycle elimination, 100-pin TQFP industrial-grade packaging (–40°C to +85°C), synchronous R/W control with ADV/LD address management, and support for individual byte write (BW1–BW4) and JTAG boundary scan.

Technical Context

The 71V3556S100PFGI8 implements a fully pipelined architecture where address/control signals are registered on the rising CLK edge, and data transfers occur two cycles later. Its ZBT™ feature eliminates bus idle cycles between read/write transitions by synchronizing internal output enable-removing the need for external OE timing control.

It integrates a synchronous 4-word burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved addressing sequences. The device uses separate VDD (3.3V core) and VDDQ (3.3V I/O) supplies, includes three active-low/high chip enables (CE1, CE2, CE2), and offers optional IEEE 1149.1 JTAG test interface in BGA variants-though not implemented in this TQFP variant.

Key Specifications

Pinout & Package

71V3556S100PFGI8 is packaged in a 100-pin plastic thin quad flatpack (TQFP), JEDEC standard PKG100, with 0.5 mm pitch and exposed thermal pad (not electrically connected). Pin 64 supports ZZ (sleep mode) on latest die revision; pins 14, 16, and 66 tolerate VIH-level inputs without direct VDD connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-167AXC and AS7C33128PFSI-15, the 71V3556S100PFGI8 delivers superior bus efficiency via ZBT™ and deterministic latency via pipelined outputs-critical for real-time packet and signal processing where dead cycles degrade throughput.

Availability

71V3556S100PFGI8 is available at Aetrix Electronics and suitable for packet buffering, network line card design, and industrial motion control applications requiring stable component supply, long-term lifecycle support, and industrial-temperature qualification.

Supply support for 71V3556S100PFGI8 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, specializes in high-performance timing, memory, and interface solutions for communications and computing infrastructure.

The 71V3556S100PFGI8 belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency bus turnaround in high-speed packet-switching, baseband processing, and real-time control systems.

FAQ

What is the memory organization and total capacity of the 71V3556S100PFGI8?

The 71V3556S100PFGI8 is configured as 128K × 36 bits, delivering a total capacity of 4,718,592 bits (4.5 Mbit). This organization supports 36-bit wide data paths ideal for networking and DSP applications requiring parallel word access without external width expansion.

Does the 71V3556S100PFGI8 support burst read and write operations?

Yes, the 71V3556S100PFGI8 supports 4-word synchronous burst operations in both linear and interleaved sequences, selected via the LBO pin. Burst mode is initiated by sampling ADV/LD high after initial address load, and each burst cycle advances the internal counter automatically.

What is the role of the ADV/LD pin in the 71V3556S100PFGI8?

The ADV/LD pin serves a dual function: when sampled LOW at the rising CLK edge, it loads a new external address into the internal register; when sampled HIGH, it advances the burst counter. This single pin enables flexible address management for both random and sequential access patterns in the 71V3556S100PFGI8.

How does the ZBTTM feature improve system performance in the 71V3556S100PFGI8?

The ZBTTM (Zero Bus Turnaround) feature in the 71V3556S100PFGI8 eliminates idle bus cycles between consecutive read and write operations. By internally synchronizing output enable and removing OE timing constraints, it enables back-to-back transactions-increasing effective bus bandwidth by up to 30% in burst-intensive workloads.

Is JTAG boundary scan supported on the 71V3556S100PFGI8 package?

No, JTAG boundary scan (IEEE 1149.1) is not supported on the 71V3556S100PFGI8. The TQFP package lacks dedicated TMS, TDI, TCK, TDO, and TRST pins-these are only available in BGA variants (e.g., "SA" suffix parts). The 71V3556S100PFGI8 is the "S" version, confirming absence of JTAG functionality.