Renesas 71V3559S85PFG8

Overview

71V3559S85PFG8 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 seamless read/write transitions. It operates at 100 MHz with 7.5 ns clock-to-data access, supports individual byte write control (BW1–BW4), and includes JTAG boundary scan (IEEE 1149.1) and sleep mode (ZZ). Used in high-speed networking and packet buffering systems where deterministic latency and bus efficiency are critical.

For engineers reviewing the 71V3559S85PFG8 datasheet, 71V3559S85PFG8 pinout, 71V3559S85PFG8 application, or 71V3559S85PFG8 equivalent, key selection criteria include its 100-pin TQFP package, synchronous 3.3V I/O and core supply, burst counter architecture, flow-through output timing, and support for linear/interleaved burst ordering via LBO - all essential for cache coherency and memory controller interface design.

Technical Context

The 71V3559S85PFG8 implements a synchronous dual-edge-triggered address/control register pipeline with flow-through data outputs - eliminating output registers to reduce read latency. Its internal burst counter advances on ADV/LD = HIGH, enabling four consecutive data cycles per address load without external sequencing logic.

It uses three chip enables (CE1, CE2 active-low; CE2 active-high) for flexible depth expansion, supports asynchronous OE for output tri-state control, and integrates optional IEEE 1149.1 JTAG test circuitry with TMS/TDI/TCK/TDO/TRST pins. Sleep mode (ZZ) gates the internal clock to minimize power while retaining data.

Key Specifications

Pinout & Package

Packaged in a 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 extensions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371DV33-100AXC and AS7C33128PFSI-10BIN, the 71V3559S85PFG8 uniquely delivers zero bus turnaround, integrated burst sequencing, and flow-through outputs - making it optimal for memory controllers prioritizing latency predictability and bus utilization over raw dual-port bandwidth.

Availability

71V3559S85PFG8 is available at Aetrix Electronics and suitable for high-speed networking equipment, industrial baseband processors, and real-time protocol stack implementations requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature operation.

Supply support for 71V3559S85PFG8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The IDT71V3559 product line was designed specifically for high-performance, low-latency memory subsystems in networking and telecom infrastructure - emphasizing burst efficiency, deterministic timing, and seamless integration with ASIC/FPGA memory controllers.

FAQ

What is the memory organization and total capacity of the 71V3559S85PFG8?

The 71V3559S85PFG8 is organized as 128K × 36 bits, delivering a total capacity of 4,718,592 bits (4.5 Mbit). This configuration is fixed for the "S" suffix variant; the related IDT71V3557S supports 256K × 18 in the same package family but is a distinct part number. The 71V3559S85PFG8 uses all 36 data bits (I/O0–I/O31 and I/OP1–I/OP4) and 18 address lines (A0–A17) to address the full array.

Does the 71V3559S85PFG8 support both linear and interleaved burst modes, and how is the selection made?

Yes, the 71V3559S85PFG8 supports both linear and interleaved burst sequences via the LBO (Linear Burst Order) pin. When LBO is driven LOW, the device executes linear bursts (A0, A1, A2, A3); when driven HIGH, it performs interleaved bursts (A0, A1, A3, A2). LBO is a static input and must remain stable during burst operation. This selection is confirmed in the Functional Block Diagram and Burst Sequence Tables of the official IDT datasheet DSC-5282/09.

What is the role of the ZZ pin on the 71V3559S85PFG8, and which package pin does it occupy?

The ZZ pin on the 71V3559S85PFG8 enables synchronous sleep mode: when asserted HIGH, it gates the internal clock and reduces power consumption while guaranteeing data retention. In the 100-pin TQFP package (PFG suffix), ZZ is assigned to pin 64 - explicitly noted in the Pin Configuration diagrams and footnotes of the datasheet. This pin is not NC in the "S" version and is functional for power management in industrial thermal environments.

How does the 71V3559S85PFG8 implement zero bus turnaround (ZBT™), and what timing benefit does it provide?

The 71V3559S85PFG8 achieves ZBT™ by eliminating dead cycles between read and write operations: a write cycle can immediately follow a read (or vice versa) without requiring bus idle time for direction change. This is enabled by its synchronous control architecture, flow-through outputs, and single R/W pin - all coordinated by the ADV/LD and CEN signals. The result is deterministic 7.5 ns clock-to-data access and continuous bus utilization, critical for packet buffering and cache coherency applications.

Is JTAG boundary scan supported on the 71V3559S85PFG8, and which pins are used?

Yes, the 71V3559S85PFG8 includes optional IEEE 1149.1-compliant JTAG boundary scan. Pins TMS, TDI, TCK, TDO, and TRST (optional reset) are dedicated to this function and appear in the 100-pin TQFP pinout (e.g., TMS = pin 91, TDI = pin 92, TCK = pin 93, TDO = pin 94, TRST = pin 95). These pins are functional in the "S" version and documented in the Pin Definitions table and Functional Block Diagram of datasheet DSC-5282/09.