Renesas 71V3556S133PFGI

Overview

71V3556S133PFGI from IDT (now Renesas) is a 3.3V synchronous ZBT SRAM with 128K × 36-bit organization, 133 MHz clock speed, 3.5 ns clock-to-data access time, zero bus turnaround architecture, and pipelined outputs in a 100-pin TQFP package. It serves as high-speed buffer memory in network packet processors and telecom line cards where burst read/write efficiency and deterministic latency are critical.

For engineers reviewing the 71V3556S133PFGI datasheet, 71V3556S133PFGI pinout, 71V3556S133PFGI application, or 71V3556S133PFGI equivalent, key selection criteria include ZBT™ timing compliance, 4-word burst capability (linear/interleaved), individual byte write control (BW1–BW4), 3.3V I/O supply (VDDQ), and industrial temperature support (–40°C to +85°C).

Technical Context

The 71V3556S133PFGI implements a fully synchronous, positive-edge-triggered architecture with registered address, data, and control inputs. Its internal burst counter and ADV/LD-controlled address loading enable deterministic 4-cycle burst sequences without external sequencing logic.

ZBTTM eliminates dead cycles between read and write operations via internal synchronization of output buffer enable - removing need for OE timing coordination. The device supports three chip enables (CE1, CE2, CE2) for depth expansion and includes optional IEEE 1149.1 JTAG boundary scan (SA variant only; PFGI is S version, so JTAG not present).

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch, lead-free and RoHS-compliant (PFGI suffix denotes industrial temp, green packaging).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1356BV133BZC and AS7C33128PFSI, the 71V3556S133PFGI uniquely delivers zero bus turnaround, integrated burst counter, and simplified control (single R/W, ADV/LD, LBO) - reducing FPGA logic utilization and PCB routing complexity in burst-centric systems.

Availability

71V3556S133PFGI is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, and baseband processor cache applications requiring stable component supply, long-term industrial temperature support, and ZBT™-compliant timing behavior.

Supply support for 71V3556S133PFGI 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 timing, memory interface, and RF power solutions for high-performance computing and communications infrastructure.

The 71V3556S133PFGI belongs to IDT's ZBT SRAM product line, designed specifically for applications demanding deterministic low-latency memory access, zero bus turnaround, and burst efficiency in networking, telecom, and military/aerospace systems.

FAQ

What is the memory organization and total capacity of the 71V3556S133PFGI?

The 71V3556S133PFGI is a 128K × 36-bit synchronous SRAM, delivering 4,718,592 bits (4.5 Mbit) of storage. This configuration is fixed for the 71V3556S part number and differs from the 256K × 18-bit 71V3558S family member. All address bits A0–A16 are used, with no A17 connection in this variant.

Does the 71V3556S133PFGI support JTAG boundary scan?

No, the 71V3556S133PFGI does not support JTAG boundary scan. The "S" suffix indicates the standard version; JTAG is only available in the "SA" variant (e.g., 71V3556SA). Pins TMS, TDI, TCK, TDO, and TRST are No Connect (NC) on the 71V3556S133PFGI in TQFP packaging.

How does the ZBTTM feature eliminate dead cycles in the 71V3556S133PFGI?

ZBTTM eliminates dead cycles by internally synchronizing the output buffer enable signal - removing the need for external OE timing control. This allows immediate transition from write to read (or read to write) without bus turnaround delay, enabling back-to-back transactions at full 133 MHz clock rate in the 71V3556S133PFGI.

What is the function of the ADV/LD and LBO pins on the 71V3556S133PFGI?

ADV/LD controls whether the internal burst counter loads a new external address (ADV/LD = LOW) or increments (ADV/LD = HIGH). LBO selects burst order: LOW = linear sequence, HIGH = interleaved sequence. Both are synchronous inputs critical to burst operation in the 71V3556S133PFGI.

Can the 71V3556S133PFGI operate with only one chip enable asserted?

No - the 71V3556S133PFGI requires CE1 = LOW, CE2 = LOW, and CE2 = HIGH simultaneously to enable the device. If any one is violated (e.g., CE2 = LOW), the chip enters deselect mode within two clock cycles. This three-signal scheme enables flexible depth expansion without external logic in the 71V3556S133PFGI.