Renesas 71V3559S80PFG

Overview

71V3559S80PFG 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 individual byte write control via BW1–BW4.

For engineers reviewing the 71V3559S80PFG datasheet, 71V3559S80PFG pinout, 71V3559S80PFG application, or 71V3559S80PFG equivalent, key selection criteria include ZBT™ timing behavior, TQFP-100 packaging, synchronous burst counter operation, JTAG boundary scan support, and compatibility with 3.3V core/I/O supply rails in high-bandwidth embedded memory subsystems.

Technical Context

The 71V3559S80PFG implements a synchronous dual-edge-triggered address/control register architecture with ADV/LD controlling either external address load (low) or internal burst counter increment (high). Its flow-through output path eliminates output data registers, reducing read latency but requiring precise OE management for bus contention control.

Burst sequencing is determined statically by LBO (Linear/Interleaved), while chip enable logic uses three independent inputs (CE1, CE2, CE2) with mixed polarity - CE1/CE2 active-low and CE2 active-high - enabling flexible depth expansion without external logic. Sleep mode (ZZ) gates the internal clock to minimize power while retaining data.

Key Specifications

Pinout & Package

71V3559S80PFG is packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, lead-free and RoHS-compliant. Pin 64 supports ZZ (sleep mode) on latest die revisions; pins 83–84 are 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 CY7C1355KV18-100BZXI and AS7C3128PFSIG, the 71V3559S80PFG uniquely delivers zero-bus-turnaround timing with integrated burst counter and flow-through outputs - essential for minimizing latency in packet-switching and cache-fill applications where address bus efficiency and deterministic read timing are critical.

Availability

71V3559S80PFG is available at Aetrix Electronics and suitable for packet buffering, cache memory, telecom line card buffering, and industrial real-time data logging requiring stable component supply across commercial and industrial temperature ranges.

Supply support for 71V3559S80PFG 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The 71V3559S80PFG belongs to IDT's ZBT™ SRAM product line, engineered specifically for high-speed networking and caching applications demanding deterministic burst access, minimal bus turnaround overhead, and robust industrial-grade reliability.

FAQ

What is the memory organization and total capacity of the 71V3559S80PFG?

The 71V3559S80PFG is organized as 128K × 36 bits, delivering a total capacity of 4,718,592 bits (4.5 Mbit). This configuration supports 36-bit wide data paths ideal for 32-bit processor interfaces with parity or ECC extension. It shares pinout and timing compatibility with the 256K × 18 variant (71V3557S80PFG), allowing layout reuse across density options.

Does the 71V3559S80PFG support JTAG boundary scan, and which pins are used?

Yes, the 71V3559S80PFG supports IEEE 1149.1-compliant JTAG boundary scan. Required pins are TMS (pin 89), TDI (pin 90), TCK (pin 91), TDO (pin 92), and optional TRST (pin 93). These signals are located on the top row of the TQFP-100 package and operate synchronously with CLK, enabling board-level test and debug without physical probe access.

How does the ZBT™ feature eliminate dead cycles in the 71V3559S80PFG?

The ZBT™ (Zero Bus Turnaround) feature in the 71V3559S80PFG allows immediate transition from a write cycle to a read cycle (or vice versa) without inserting idle clock cycles. This is achieved through synchronized address/control latching and flow-through outputs, ensuring the bus remains active - critical for sustaining peak bandwidth in packet buffering and cache subsystems where bus efficiency directly impacts throughput.

What is the function of the ADV/LD and LBO pins on the 71V3559S80PFG?

ADV/LD is a dual-function synchronous input: LOW loads a new external address into the internal register; HIGH advances the internal burst counter. LBO (Linear/Interleaved Burst Order) is a static input selecting burst sequence - LOW enables linear addressing (0,1,2,3), HIGH enables interleaved (0,2,1,3). Both pins must be stable before clock edges and cannot change mid-burst.

Can the 71V3559S80PFG operate in low-power sleep mode, and how is it controlled?

Yes, the 71V3559S80PFG supports synchronous sleep mode via the ZZ pin (pin 64 on TQFP-100). When ZZ is driven HIGH, the internal clock is gated, reducing dynamic power consumption while guaranteeing data retention across the full industrial temperature range (–40°C to +85°C). The device resumes normal operation within one clock cycle after ZZ returns LOW.