Renesas 71V3559S80PFGI

Overview

71V3559S80PFGI from Integrated Device Technology is a 3.3V synchronous ZBT™ SRAM organized as 128K x 36 (4.5 Mbit), featuring flow-through outputs, 4-word burst capability (linear or interleaved), and zero bus turnaround for high-speed memory interfacing in network packet buffers and cache controllers. It operates at 100 MHz with 7.5 ns clock-to-data access and supports industrial temperature range (–40°C to +85°C).

For engineers reviewing the 71V3559S80PFGI datasheet, 71V3559S80PFGI pinout, 71V3559S80PFGI application, or 71V3559S80PFGI equivalent, key selection criteria include burst mode control via ADV/LD and LBO pins, individual byte write enables (BW1–BW4), JTAG boundary scan support, and compatibility with 3.3V core/I/O supplies in TQFP-100 packaging.

Technical Context

The 71V3559S80PFGI implements a synchronous dual-edge-triggered architecture where address, control, and data-in signals are registered on the rising edge of CLK. Its internal burst counter advances on ADV/LD = HIGH, enabling four consecutive data transfers per address load without dead cycles between read/write transitions.

It features three chip enables (CE1, CE2, CE2) with mixed polarity - CE1/CE2 active-low and CE2 active-high - allowing flexible depth expansion. Output enable (OE) is asynchronous and tri-states I/Os independently of clock, while sleep mode (ZZ) gates the internal clock to reduce power with guaranteed data retention.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch. Pin 64 supports ZZ (sleep mode) on latest die revisions; pins 83–84 reserved for future density expansion.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355KV18-100BZXI and AS7C3128PFSIG, the 71V3559S80PFGI uniquely integrates burst addressing, sleep mode, and JTAG in a single 128K × 36 device - reducing system component count and enabling power-aware, testable designs without external logic.

Availability

71V3559S80PFGI is available at Aetrix Electronics and suitable for network packet buffers, telecom line cards, and DSP co-processor buffers requiring stable component supply across extended product lifecycles.

Supply support for 71V3559S80PFGI 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

Integrated Device Technology (IDT), now part of Renesas Electronics, specializes in high-performance timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71V3559S80PFGI belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency memory subsystems in high-speed packet processing and real-time control applications.

FAQ

What is the maximum clock frequency supported by the 71V3559S80PFGI?

The 71V3559S80PFGI supports a maximum clock frequency of 100 MHz, corresponding to a 10 ns clock period. This is validated under industrial temperature conditions (–40°C to +85°C) with 3.3 V ±5% supply rails. The 7.5 ns clock-to-data access time (tCD) ensures data validity within the first half of the subsequent clock cycle, enabling tight timing closure in FPGA- or ASIC-based memory controllers.

Does the 71V3559S80PFGI support both linear and interleaved burst modes?

Yes, the 71V3559S80PFGI supports both linear and interleaved 4-word burst sequences, selected by the static LBO pin: LBO = LOW configures linear order (A0, A1, A2, A3), while LBO = HIGH selects interleaved order (A0, A2, A1, A3). The burst counter advances on each rising CLK edge when ADV/LD = HIGH, and the sequence wraps automatically after four words - a feature confirmed in the Interleaved and Linear Burst Sequence Tables of the datasheet.

How does the ZBT™ (Zero Bus Turnaround) feature function in the 71V3559S80PFGI?

The ZBT™ feature in the 71V3559S80PFGI eliminates dead cycles between successive read and write operations by allowing immediate transition from one access type to another without bus idle time. This is achieved through synchronized control logic and flow-through outputs, ensuring that the data bus remains active across consecutive cycles - a behavior verified in the Functional Timing Diagram and Mixed Load/Burst Operation Table of the official datasheet.

Is JTAG boundary scan supported on the 71V3559S80PFGI, and which pins are used?

Yes, the 71V3559S80PFGI includes IEEE 1149.1-compliant JTAG boundary scan. Pins TMS, TDI, TCK, TDO, and optional TRST (pin 65 in TQFP-100) implement the test access port. These pins are dedicated and do not share functions with memory control signals - confirmed in the Pin Definitions table and Functional Block Diagram of the datasheet, with internal pull-ups on TMS, TDI, TCK, and TRST.

What is the role of the ZZ (Sleep Mode) pin on the 71V3559S80PFGI, and how is it implemented?

The ZZ pin on the 71V3559S80PFGI is a synchronous active-high input that gates the internal clock and places the device in low-power sleep mode while retaining memory contents. When asserted, it reduces dynamic power consumption significantly; data retention is guaranteed across the full industrial temperature range. Pin 64 in the TQFP-100 package supports ZZ on latest die revisions, as documented in the Pin Configuration diagrams and Absolute Maximum Ratings section.