Renesas 71V3556S133PFG

Overview

71V3556S133PFG 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 three chip enables for depth expansion. Used in high-speed networking line cards and packet buffering where deterministic latency and bus efficiency are critical.

For engineers reviewing the 71V3556S133PFG datasheet, 71V3556S133PFG pinout, 71V3556S133PFG application, or 71V3556S133PFG equivalent, key selection criteria include ZBT™ timing compliance, TQFP-100 package compatibility, 3.3V I/O and core supply requirements, industrial temperature support (–40°C to +85°C), and JTAG boundary-scan availability in SA variants.

Technical Context

The 71V3556S133PFG implements a fully synchronous, positive-edge-triggered architecture with registered address, data, and control inputs. Its ZBT™ feature eliminates dead cycles between read/write transitions by overlapping bus turnaround with internal memory access.

It integrates a 4-word burst counter controlled by ADV/LD and LBO pins, supports pipelined output enable (OE asynchronous), and includes optional IEEE 1149.1 JTAG test logic. The device uses dual power domains: VDD (3.3V ±5%) for core logic and VDDQ (3.3V ±5%) for I/O buffers.

Key Specifications

Pinout & Package

Packaged in a 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch, JEDEC MO-140 standard. Pin 1 marked by corner notch; top-side marking includes "71V3556S133PFG" and date code.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1356BV133BXC and AS7C33128PFSIG, the 71V3556S133PFG uniquely delivers ZBT™-enabled zero-turnaround operation, integrated burst counter, industrial temperature support, and optional JTAG - making it optimal for deterministic, high-throughput embedded memory interfaces.

Availability

71V3556S133PFG is available at Aetrix Electronics and suitable for high-speed networking equipment, industrial automation controllers, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 71V3556S133PFG 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, computing, and industrial markets.

The 71V3556S133PFG belongs to IDT's ZBT™ SRAM product line, engineered specifically for applications demanding zero-bus-turnaround timing, burst efficiency, and robust synchronous operation in bandwidth-constrained systems.

FAQ

What is the maximum operating frequency and corresponding access time for the 71V3556S133PFG?

The 71V3556S133PFG is rated for 133 MHz operation, with a guaranteed clock-to-data access time of ≤7.5 ns under industrial temperature and voltage conditions. This timing is achieved using registered inputs and pipelined outputs, and assumes proper setup/hold compliance on all synchronous signals relative to the CLK rising edge.

Does the 71V3556S133PFG support burst mode, and how is it configured?

Yes, the 71V3556S133PFG supports 4-word burst mode. Burst operation is enabled via the ADV/LD pin: sampling ADV/LD HIGH advances the internal counter, while sampling it LOW loads a new external address. The LBO pin selects linear (LBO = LOW) or interleaved (LBO = HIGH) burst order - a static configuration that must remain stable during burst sequences.

What is the function of the ZZ pin on the 71V3556S133PFG, and does it retain data in sleep mode?

The ZZ pin on the 71V3556S133PFG is a synchronous active-HIGH sleep mode input. When asserted, it gates the internal clock and reduces power consumption to its lowest level while guaranteeing full data retention. This makes the 71V3556S133PFG suitable for power-sensitive applications such as battery-backed industrial loggers or portable medical devices.

How many chip enable signals does the 71V3556S133PFG have, and what are their polarities?

The 71V3556S133PFG has three chip enable signals: CE1 and CE2 are active-low, while CE2 is active-high. All three must be simultaneously asserted (CE1 = LOW, CE2 = LOW, CE2 = HIGH) to select the device. Deselection occurs if any one is deasserted, initiating a 2-cycle tri-state transition on the data bus.

Is JTAG boundary scan available on the 71V3556S133PFG, and which package options support it?

JTAG boundary scan (IEEE 1149.1) is available only on the "SA" variant suffix (e.g., 71V3556SA), not on the base "S" version like the 71V3556S133PFG. It is supported in BGA packages (119-ball and 165-fBGA), but not in the TQFP-100 package used by the 71V3556S133PFG. TRST is optional and internally pulled up.