Renesas 71V3556SA133BGI8

Overview

71V3556SA133BGI8 from IDT (now Renesas) is a 128K × 36-bit, 4.5-Mbit, 3.3V synchronous ZBT™ SRAM with zero bus turnaround, pipelined outputs, and 133 MHz operation (7.5 ns clock-to-data access). It features 4-word burst capability (linear/interleaved), individual byte write control (BW1–BW4), and JTAG boundary scan (IEEE 1149.1). Used in high-speed networking line cards and packet buffer subsystems requiring deterministic latency and no dead cycles between read/write transitions.

For engineers reviewing the 71V3556SA133BGI8 datasheet, 71V3556SA133BGI8 pinout, 71V3556SA133BGI8 application, or 71V3556SA133BGI8 equivalent, key selection criteria include ZBT™ timing compliance, TQFP-100 package compatibility, industrial temperature support (–40°C to +85°C), 3.3V core/I/O supply tolerance, and JTAG-enabled testability for board-level validation.

Technical Context

The 71V3556SA133BGI8 implements a fully synchronous, positive-edge-triggered architecture with registered address, data, and control inputs. Its ZBT™ feature eliminates bus turnaround dead cycles by enabling immediate read-after-write or write-after-read transitions without wait states.

It integrates a 4-word burst counter controlled by ADV/LD and LBO pins, supports interleaved or linear addressing sequences, and uses internal output buffer synchronization to remove OE timing constraints. The device includes three chip enables (CE1, CE2, CE2) for depth expansion and optional IEEE 1149.1 JTAG for boundary scan testing.

Key Specifications

Pinout & Package

71V3556SA133BGI8 is packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body size, with 0.5 mm pitch. Pin 1 marked via corner notch; top-side marking includes "71V3556SA133BGI8" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1356BV33-133AXC and AS7C33128PFSI-133BIN, the 71V3556SA133BGI8 uniquely delivers guaranteed ZBT™ timing, JTAG testability, and programmable burst control-making it optimal for carrier-grade infrastructure demanding deterministic latency and production test coverage.

Availability

71V3556SA133BGI8 is available at Aetrix Electronics and suitable for high-speed networking equipment, telecom line cards, and industrial real-time control systems requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 71V3556SA133BGI8 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, is a semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71V3556SA133BGI8 belongs to IDT's ZBT™ SRAM product line, designed specifically for zero-latency memory buffering in packet-switched networks, baseband processing, and real-time control systems demanding deterministic timing and burst efficiency.

FAQ

What is the maximum operating frequency of the 71V3556SA133BGI8?

The 71V3556SA133BGI8 is rated for 133 MHz operation, corresponding to a 7.5 ns clock period and 7.5 ns clock-to-data access time. This frequency is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3V ±5% supply conditions, as specified in the official Renesas datasheet revision Aug.06.21.

Does the 71V3556SA133BGI8 support JTAG boundary scan?

Yes, the 71V3556SA133BGI8 includes full IEEE 1149.1-compliant JTAG boundary scan functionality with dedicated TMS, TDI, TCK, TDO, and optional TRST pins. This feature is explicitly confirmed in the "SA" variant designation and functional block diagram in the datasheet, enabling PCB interconnect testing and system-level diagnostics.

How does the ZBT™ feature eliminate dead cycles in the 71V3556SA133BGI8?

The ZBT™ architecture in the 71V3556SA133BGI8 allows immediate transition from write to read (or read to write) without inserting idle cycles. This is achieved via internal pipeline staging and synchronized output enable-ensuring data valid on the bus two clocks after command assertion, regardless of direction change, as verified in the synchronous truth table and timing diagrams.

What memory configuration does the 71V3556SA133BGI8 implement?

The 71V3556SA133BGI8 implements a fixed 128K × 36-bit organization (4.5 Mbit total), distinct from the 256K × 18-bit variant (71V3558SA). This configuration is confirmed by pin assignments (A0–A16, 36 I/O lines), functional block diagram labeling, and ordering information in the datasheet-no configuration register or mode pin alters this topology.

Is the 71V3556SA133BGI8 available in industrial temperature grade?

Yes, the "BGI8" suffix denotes industrial temperature grade (–40°C to +85°C), as defined in the ordering information section of the datasheet. Absolute maximum ratings, recommended operating conditions, and timing specifications are all validated across this range, making the 71V3556SA133BGI8 suitable for base station, router, and industrial control deployments.