Renesas 71V3556SA150BGGI

Overview

71V3556SA150BGGI from IDT (now Renesas) is a 128K × 36-bit, 4.5 Mbit, 3.3V synchronous ZBT™ SRAM with zero bus turnaround, 150 MHz operation (6.67 ns cycle time), pipelined outputs, and 4-word burst capability. It features synchronous address/control/data registers triggered on the positive clock edge, individual byte write enables (BW1–BW4), and JTAG boundary scan (IEEE 1149.1). It is used in high-bandwidth packet buffering and network switch fabric interfaces requiring deterministic latency and no dead cycles between read/write transitions.

For engineers reviewing the 71V3556SA150BGGI datasheet, 71V3556SA150BGGI pinout, 71V3556SA150BGGI application, or 71V3556SA150BGGI equivalent, key selection criteria include ZBT™ timing compliance, 100-pin TQFP or 119-ball BGA package compatibility, industrial temperature support (–40°C to +85°C), 3.3V core/I/O supply tolerance, and JTAG testability for production validation.

Technical Context

The 71V3556SA150BGGI implements a fully synchronous, pipelined architecture where address and control signals are registered on the rising CLK edge, and data access occurs two cycles later. Its ZBT™ feature eliminates bus turnaround dead cycles by enabling immediate read-after-write or write-after-read transitions without wait states.

It integrates an on-chip 4-word burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved burst sequences. The device includes three chip enables (CE1, CE2 active-low; CE2 active-high), asynchronous OE, and optional IEEE 1149.1 JTAG interface with TMS/TDI/TCK/TDO/TRST pins - available only in BGA packages per documentation.

Key Specifications

Pinout & Package

71V3556SA150BGGI is packaged in a 119-ball fine-pitch ball grid array (fBGA), designated BGGI per IDT ordering nomenclature. This JEDEC-standard package supports automated optical inspection and thermal dissipation suitable for industrial ambient conditions.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-167AXC and AS7C33128PFSIG-15BIN, the 71V3556SA150BGGI uniquely delivers ZBT™ timing, integrated burst control, and IEEE 1149.1 testability in a qualified industrial BGA package - making it optimal for latency-sensitive, high-reliability networking and embedded control systems.

Availability

71V3556SA150BGGI is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric, industrial PLC memory cache, and medical imaging data pipeline applications requiring stable component supply and long-term industrial lifecycle support.

Supply support for 71V3556SA150BGGI 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, specializes in high-performance timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71V3556SA150BGGI belongs to IDT's ZBT™ synchronous SRAM product line, engineered specifically for zero-latency memory subsystems in packet-switched networks, baseband processing, and real-time embedded control.

FAQ

What is the maximum operating frequency of the 71V3556SA150BGGI?

The 71V3556SA150BGGI is rated for 150 MHz operation, corresponding to a 6.67 ns clock cycle time. This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3V ±5% supply conditions, with 3.5 ns clock-to-data access time enabling tight pipeline scheduling in high-speed memory controllers.

Does the 71V3556SA150BGGI support burst mode, and how is it configured?

Yes, the 71V3556SA150BGGI supports 4-word burst mode using its internal counter. Burst behavior is selected via the LBO pin (low = linear, high = interleaved) and controlled by ADV/LD: sampling ADV/LD high advances the counter, while sampling it low loads a new external address. This enables efficient sequential access without repeated address bus transactions.

Is JTAG boundary scan available on the 71V3556SA150BGGI, and which pins implement it?

Yes, the 71V3556SA150BGGI includes optional IEEE 1149.1-compliant JTAG boundary scan. Pins TMS, TDI, TCK, TDO, and TRST (optional reset) are assigned to dedicated balls in the 119-ball BGA package. TRST is not required, as automatic reset occurs at power-up and via TMS/TCK per standard.

How does the ZBT™ feature eliminate bus turnaround dead cycles in the 71V3556SA150BGGI?

The ZBT™ architecture in the 71V3556SA150BGGI allows immediate transition between read and write operations without inserting idle cycles. By decoupling address/control registration from data transfer timing (which occurs two clocks later), the bus remains active - enabling back-to-back read-after-write or write-after-read sequences essential for high-throughput packet processing.

What is the function of the ZZ (sleep mode) pin on the 71V3556SA150BGGI, and how is it used?

The ZZ pin on the 71V3556SA150BGGI enables synchronous sleep mode: asserting ZZ high gates the internal clock and reduces power consumption to its minimum while retaining memory contents. Data retention is guaranteed during sleep. ZZ has an internal pulldown resistor, so it defaults to inactive (low) unless actively driven high by the system controller.