Renesas 71V3559S80BQG8

Overview

71V3559S80BQG8 from Integrated Device Technology is a 3.3V synchronous ZBT™ SRAM organized as 256K x 18 (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) for system-level testability in high-speed networking and packet buffering applications.

For engineers reviewing the 71V3559S80BQG8 datasheet, 71V3559S80BQG8 pinout, 71V3559S80BQG8 application, or 71V3559S80BQG8 equivalent, key selection criteria include its 100-pin TQFP package, synchronous 3.3V core/I/O supply, burst counter architecture, sleep mode (ZZ) support, and compatibility with ZBT™-optimized memory controllers in telecom infrastructure and FPGA-based data path designs.

Technical Context

The 71V3559S80BQG8 implements a synchronous dual-edge-triggered interface with ADV/LD controlling address load versus burst counter increment, and LBO selecting linear or interleaved burst order. Its flow-through output path eliminates output register latency, while internal synchronization of OE removes external timing constraints on output enable control.

It integrates three chip enables (CE1, CE2, CE2) with mixed polarity for flexible depth expansion, a dedicated Clock Enable (CEN) to suspend operation without clock gating, and optional JTAG test logic with TMS/TDI/TCK/TDO/TRST pins. Sleep mode (ZZ) gates the internal clock to minimize power while retaining data.

Key Specifications

Pinout & Package

71V3559S80BQG8 is packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, with 0.5 mm lead pitch. Pin 1 is located at top-left corner (marking dot adjacent), and pin numbering follows counter-clockwise convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355BV18-100BZXI and AS7C3256B-10JIN, the 71V3559S80BQG8 uniquely combines ZBT™ zero-turnaround, integrated JTAG, industrial temperature range, and TQFP packaging - making it optimal for upgradeable telecom hardware and FPGA-based embedded systems requiring testability and thermal robustness.

Availability

71V3559S80BQG8 is available at Aetrix Electronics and suitable for packet buffering, FPGA co-processing, telecom line card memory, and industrial data logging requiring stable component supply across extended product lifecycles.

Supply support for 71V3559S80BQG8 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 71V3559S80BQG8 belongs to IDT's ZBT™ SRAM product line, engineered specifically for high-speed, low-latency data buffering in network infrastructure and real-time embedded systems where deterministic timing and bus efficiency are critical.

FAQ

What memory organization does the 71V3559S80BQG8 implement?

The 71V3559S80BQG8 implements a 256K x 18 organization (4.5 Mbit total), supporting an 18-bit data bus with two parity bits (I/OP1 and I/OP2). This configuration is distinct from the 128K x 36 variant (71V3557) and is optimized for systems requiring narrower, higher-speed data paths - such as FPGA-based packet processors and telecom PHY interfaces.

Does the 71V3559S80BQG8 support burst mode, and how is it configured?

Yes, the 71V3559S80BQG8 supports 4-word synchronous burst mode controlled by the ADV/LD and LBO pins. When ADV/LD is HIGH, the internal burst counter advances; LBO selects linear (LBO = LOW) or interleaved (LBO = HIGH) addressing order. Burst operation requires no external address generation, reducing controller overhead and bus contention in high-throughput applications.

What is the purpose of the ZZ pin on the 71V3559S80BQG8?

The ZZ pin on the 71V3559S80BQG8 enables synchronous sleep mode: when driven HIGH, it internally gates the clock and reduces dynamic power consumption while guaranteeing data retention. This feature is critical for energy-constrained telecom modules and industrial controllers that require periodic low-power states without data loss or external refresh circuitry.

How does the 71V3559S80BQG8 achieve zero bus turnaround (ZBT™)?

The 71V3559S80BQG8 achieves ZBT™ by eliminating dead cycles between read and write operations through synchronized control logic and flow-through outputs. Its R/W pin determines transaction type one cycle after address load, and the burst counter allows immediate continuation of sequential accesses - enabling back-to-back reads/writes without bus arbitration delays or turnaround penalties.

Is JTAG boundary scan supported on the 71V3559S80BQG8, and which pins are used?

Yes, the 71V3559S80BQG8 includes optional IEEE 1149.1 JTAG boundary scan. Pins TMS, TDI, TCK, TDO, and TRST (pin 66 on TQFP) implement the full TAP controller. TRST is asynchronous and optional; if unused, it may be left floating (internally pulled up). JTAG enables production test coverage and in-system diagnostics without requiring additional test fixtures.