Renesas 71V3557S80BGI8

Overview

IDT71V3557S80BGI8 from Integrated Device Technology is a 128K × 36-bit (4.5 Mbit), 3.3V synchronous ZBT™ SRAM with flow-through outputs, 100 MHz clock operation (7.5 ns clock-to-data access), and zero bus turnaround architecture. It supports interleaved/linear 4-word burst reads/writes, individual byte write control (BW1–BW4), and JTAG boundary scan (IEEE 1149.1). Used in high-speed network packet buffers and cache coherency subsystems where deterministic latency and bus efficiency are critical.

For engineers reviewing the IDT71V3557S80BGI8 datasheet, IDT71V3557S80BGI8 pinout, IDT71V3557S80BGI8 application, or IDT71V3557S80BGI8 equivalent, key selection criteria include ZBT™ timing compliance, TQFP-100 package compatibility, 3.3V core/I/O supply tolerance, synchronous burst counter behavior, and industrial temperature range (–40°C to +85°C) support.

Technical Context

The IDT71V3557S80BGI8 implements a synchronous dual-edge-triggered address/control register pipeline with flow-through data output path-no output register-enabling immediate data availability on CLK edge + t_CD. Its burst counter advances on ADV/LD = HIGH and loads new addresses on ADV/LD = LOW, with LBO pin selecting linear or interleaved sequence order.

Three chip enables (CE1, CE2 active-low; CE2 active-high) provide flexible depth expansion, while CEN suspends all synchronous logic without affecting output state. The optional JTAG interface includes TMS, TDI, TCK, TDO, and TRST (asynchronous reset), and ZZ pin enables low-power sleep mode 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 1 marked by corner notch; pins 14, 64, and 66 require VSS connection per latest die revision (pin 64 supports ZZ sleep mode).

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT71V3557S80BGI8, the Cypress alternative omits JTAG and sleep mode but matches pinout and speed for legacy drop-in replacement, while the ISSI part trades burst capability and 36-bit width for higher density and simpler control-requiring bus-width and timing redesign.

Availability

IDT71V3557S80BGI8 is available at Aetrix Electronics and suitable for network infrastructure, industrial automation, and telecom equipment requiring stable component supply, long-term lifecycle support, and industrial-temperature performance.

Supply support for IDT71V3557S80BGI8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

IDT71V3557S80BGI8 belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-bus-turnaround applications in high-speed packet processing, cache subsystems, and real-time control systems demanding deterministic latency and burst efficiency.

FAQ

What is the memory organization and total capacity of the IDT71V3557S80BGI8?

The IDT71V3557S80BGI8 is organized as 128K × 36 bits, delivering a total capacity of 4,718,592 bits (4.5 Mbit). This configuration supports 36-bit data paths common in high-end networking and DSP interfaces. It shares pin compatibility with the 256K × 18 variant (IDT71V3559), allowing layout reuse across density options.

Does the IDT71V3557S80BGI8 support burst read and write operations?

Yes, the IDT71V3557S80BGI8 supports synchronous 4-word burst operations for both reads and writes. Burst order (linear or interleaved) is selected via the LBO pin. The internal burst counter advances on ADV/LD = HIGH, enabling efficient sequential access without repeated address bus cycles-critical for packet buffering and streaming applications.

What is the role of the ZZ pin on the IDT71V3557S80BGI8?

The ZZ pin on the IDT71V3557S80BGI8 is a synchronous sleep mode enable. When driven HIGH, it internally gates the clock and reduces power consumption to its lowest level while guaranteeing data retention. This feature is essential for power-sensitive industrial and telecom applications where intermittent operation or standby modes are required.

Is JTAG boundary scan supported on the IDT71V3557S80BGI8?

Yes, the IDT71V3557S80BGI8 includes optional IEEE 1149.1-compliant JTAG boundary scan functionality with dedicated TMS, TDI, TCK, TDO, and TRST pins. TRST is asynchronous and optional; if unused, it may be left floating (internally pulled up). This enables production testing, board-level diagnostics, and in-system verification without requiring additional test fixtures.

What package type and footprint does the IDT71V3557S80BGI8 use?

The IDT71V3557S80BGI8 is supplied in a JEDEC-standard 100-pin thin quad flatpack (TQFP), measuring 14 mm × 20 mm with 0.5 mm lead pitch. Pin 1 is identified by a corner notch. Pins 14, 64, and 66 must connect to VSS per latest die revision, and pin 64 supports the ZZ sleep function-key for PCB layout and thermal design validation.