Renesas 71V3558SA100BQGI

Overview

71V3558SA100BQGI from IDT (now Renesas) is a 3.3V synchronous ZBT™ SRAM with 256K × 18-bit organization (4.5 Mbit), 100 MHz clock speed, 3.5 ns clock-to-data access, zero bus turnaround architecture, and JEDEC-standard 100-pin TQFP packaging. It serves as a high-bandwidth, low-latency memory buffer in network packet processors and telecom line cards requiring burst-mode pipelined data transfers.

For engineers reviewing the 71V3558SA100BQGI datasheet, 71V3558SA100BQGI pinout, 71V3558SA100BQGI application, or 71V3558SA100BQGI equivalent, key selection criteria include ZBT™ dead-cycle elimination, 4-word interleaved/linear burst capability, individual byte write control (BW1–BW4), JTAG IEEE 1149.1 support, and industrial temperature operation (–40°C to +85°C).

Technical Context

The 71V3558SA100BQGI implements a fully synchronous, pipelined SRAM architecture where address/control registration occurs on the rising CLK edge, with data output valid two cycles later. Its ZBT™ feature eliminates bus turnaround latency by enabling immediate read-after-write or write-after-read transitions without dead cycles.

It integrates an on-chip burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved 4-word burst sequences. The device includes three chip enables (CE1, CE2, CE2) for depth expansion, asynchronous OE for output tri-state control, and optional boundary-scan JTAG (TMS/TDI/TCK/TDO/TRST) compliant with IEEE 1149.1.

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. Pin 64 supports ZZ (sleep mode) on latest die revision; pins 14, 16, and 66 tolerate VIH-level input without direct VDD connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355BV18-100BZI and AS7C3256B-10JIN, the 71V3558SA100BQGI delivers unique ZBT™ dead-cycle elimination and integrated burst control-critical for maximizing throughput in pipelined telecom and packet-processing systems-while maintaining pin-compatible TQFP packaging and industrial temperature support.

Availability

71V3558SA100BQGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and defense electronics requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for 71V3558SA100BQGI 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 71V3558SA100BQGI belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency bus turnaround in high-speed packet-switching and real-time control systems demanding deterministic timing and burst efficiency.

FAQ

What is the memory organization and density of the 71V3558SA100BQGI?

The 71V3558SA100BQGI is configured as 256K × 18-bit, delivering 4.5 Mbit (4,718,592-bit) total capacity. This x18 organization is implemented in the 100-pin TQFP package and is distinct from the 128K × 36 variant also offered in the same family. The 71V3558SA100BQGI uses address lines A0–A17, with A0–A16 actively decoded for 256K addressing.

Does the 71V3558SA100BQGI support JTAG boundary scan, and which pins are used?

Yes, the 71V3558SA100BQGI supports IEEE 1149.1-compliant boundary scan. The JTAG interface uses pins TMS (pin 97), TDI (pin 98), TCK (pin 99), TDO (pin 100), and optional TRST (pin 64 on latest die revision). All JTAG pins have internal pull-ups except TRST, which has an internal pull-up and may be left floating if unused.

How does the ZBT™ feature eliminate dead cycles in the 71V3558SA100BQGI?

The ZBT™ (Zero Bus Turnaround) feature in the 71V3558SA100BQGI allows immediate transition from a write cycle to a read cycle-or vice versa-without inserting idle bus cycles. This is achieved through internal synchronization of OE and address/control registers, ensuring the bus remains active and productive during mode switches, directly improving effective bandwidth in pipelined architectures.

What is the function of the ADV/LD and LBO pins on the 71V3558SA100BQGI?

ADV/LD is a synchronous input that determines whether the internal burst counter loads a new external address (ADV/LD = LOW) or increments (ADV/LD = HIGH). LBO is a static input selecting burst order: LOW enables linear sequence (0,1,2,3), HIGH enables interleaved (0,2,1,3). Both pins must be stable before and during burst operation to ensure correct address sequencing in the 71V3558SA100BQGI.

What power supply requirements and thermal specifications apply to the 71V3558SA100BQGI?

The 71V3558SA100BQGI requires two 3.3 V supplies: VDD (core, 3.135–3.465 V) and VDDQ (I/O, 3.135–3.465 V), each with ±5% tolerance. It operates over the industrial temperature range of –40°C to +85°C and supports sleep mode (via ZZ pin) for reduced power consumption while retaining data. Absolute maximum ratings include VTERM ≤ VDD + 0.5 V on I/O pins.