Renesas 71V2556S150PFGI8

Overview

71V2556S150PFGI8 from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM with 128K × 36-bit (4.5 Mbit) organization, 150 MHz operation (6.7 ns clock cycle), pipelined outputs, and zero bus turnaround for seamless read/write transitions. It features 2.5V I/O supply, individual byte write control (BW1–BW4), and supports linear/interleaved 4-word burst modes in high-speed networking and packet buffering applications.

For engineers reviewing the 71V2556S150PFGI8 datasheet, 71V2556S150PFGI8 pinout, 71V2556S150PFGI8 application, or 71V2556S150PFGI8 equivalent, key selection criteria include its 150 MHz sustained throughput, ZBT architecture eliminating dead cycles, TQFP-100 package compatibility, industrial temperature range (–40°C to +85°C), and JTAG support in SA variants - critical for telecom control plane memory and FPGA co-processor buffers.

Technical Context

The 71V2556S150PFGI8 implements a fully synchronous, clock-edge-triggered interface with address, data, and control registers aligned to the rising CLK edge. Its internal burst counter and ADV/LD pin enable automatic address incrementing during burst reads/writes, while LBO selects linear or interleaved addressing sequences.

ZBT functionality is achieved via internally synchronized OE and pipelined output registers, removing external timing constraints on bus turnaround. The device uses three chip enables (CE1, CE2, CE2) for flexible depth expansion and supports optional IEEE 1149.1 JTAG boundary scan - though this feature is absent in the "S" version (confirmed by pin definitions showing NC/TMS/TDI/TCK/TRST).

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, lead-free and RoHS-compliant (PFGI8 suffix). Pinout validated per IDT document 4875 drw 02 (PKG100 top view).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1356BV18-167BZI and AS7C3256A-15JCIN, the 71V2556S150PFGI8 delivers superior bus utilization via ZBT and deterministic low-latency access via pipelined outputs - essential for real-time packet processing and control plane applications where cycle efficiency directly impacts system throughput.

Availability

71V2556S150PFGI8 is available at Aetrix Electronics and suitable for network packet buffering, FPGA co-processor cache, and telecom control plane memory requiring stable component supply across extended product lifecycles.

Supply support for 71V2556S150PFGI8 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 71V2556S150PFGI8 belongs to IDT's ZBT SRAM product line, designed specifically for high-speed, low-latency data buffering in networking equipment, base stations, and real-time embedded systems demanding deterministic bus behavior.

FAQ

What is the maximum operating frequency of the 71V2556S150PFGI8?

The 71V2556S150PFGI8 is rated for 150 MHz operation (6.7 ns clock period), verified across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±5% supply. This frequency supports sustained 600 MB/s burst bandwidth and is guaranteed per AC electrical specifications in the official IDT datasheet revision Aug.20.20.

Does the 71V2556S150PFGI8 support JTAG boundary scan?

No, the 71V2556S150PFGI8 does not support JTAG boundary scan. The "S" suffix denotes the standard version without JTAG; only the "SA" variant includes IEEE 1149.1-compliant TMS/TDI/TCK/TDO/TRST pins. In the 71V2556S150PFGI8, those pins are marked NC in the PKG100 pinout and confirmed as no-connect in functional descriptions.

What is the purpose of the LBO pin on the 71V2556S150PFGI8?

The LBO (Linear/Interleaved Burst Order) pin on the 71V2556S150PFGI8 selects the burst address sequence: pulled low (to VSS) enables linear order (A0, A1, A2, A3), while pulled high (to VDD) enables interleaved order (A0, A2, A1, A3). This setting determines how the internal burst counter increments during 4-word burst operations and must be configured before burst initiation.

How many byte write enable signals does the 71V2556S150PFGI8 provide?

The 71V2556S150PFGI8 provides four independent byte write enable signals: BW1, BW2, BW3, and BW4. Each controls one 8-bit segment of the 36-bit data bus (I/O[7:0], I/O[15:8], I/O[23:16], I/O[31:24]), enabling selective 8-bit writes without requiring external masking logic or read-modify-write cycles.

What package type and lead count does the 71V2556S150PFGI8 use?

The 71V2556S150PFGI8 uses a 100-pin thin quad flatpack (TQFP) package, JEDEC standard PKG100, with 14 mm × 20 mm body size and lead-free (Pb-free) construction. The "PFGI8" suffix explicitly denotes this RoHS-compliant TQFP variant rated for industrial temperature operation.