Renesas 71V547S100PFG

Overview

71V547S100PFG from IDT (now Renesas) is a 3.3V, 128K × 36-bit synchronous SRAM with Zero Bus Turnaround (ZBT™) architecture, flow-through outputs, and 4-word burst capability. It delivers 95 MHz operation (8 ns clock-to-data access), supports linear/interleaved burst ordering via LBO pin, and features three chip enables for depth expansion - used in high-speed packet buffering and network switch fabric control planes.

For engineers reviewing the 71V547S100PFG datasheet, 71V547S100PFG pinout, 71V547S100PFG application, or 71V547S100PFG equivalent, key selection criteria include ZBT™ bus turnaround elimination, synchronous 3.3V operation with ±5% tolerance, JEDEC-standard 100-pin TQFP packaging, and support for individual byte write (BW1–BW4) and clock enable (CEN) for low-power idle states.

Technical Context

The 71V547S100PFG implements a synchronous pipeline architecture where address/control registration occurs on the rising CLK edge, with data output appearing one cycle later. Its ZBT™ feature eliminates dead cycles between read/write transitions by decoupling bus direction control from external OE timing - only OE remains asynchronous.

Burst operation is managed by an on-chip counter advanced via ADV/LD (high = increment, low = load new address), with sequence order determined statically by LBO (low = linear, high = interleaved). Chip select uses three enables (CE1, CE2 active-low; CE2 active-high), enabling flexible memory depth expansion without external logic.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 14 mm × 20 mm 100-pin thin quad flatpack (TQFP), RoHS-compliant, with 0.5 mm pitch and exposed thermal pad (not electrically connected).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371DV33-100AXC and AS7C312836B-10BIN, the 71V547S100PFG uniquely combines ZBT™, flow-through outputs, and integrated burst counter - delivering lowest latency and highest effective bandwidth for memory-intensive telecom and industrial control applications.

Availability

71V547S100PFG is available at Aetrix Electronics and suitable for network packet buffering, high-speed switch fabric control, and industrial real-time data acquisition requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 71V547S100PFG 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 fabless semiconductor company specializing in high-performance timing, memory interface, and RF solutions for communications and computing infrastructure.

The 71V547S100PFG belongs to IDT's ZBT™ synchronous SRAM product line, designed specifically for low-latency, high-throughput data buffering in networking equipment, telecom line cards, and real-time industrial controllers.

FAQ

What is the maximum operating frequency of the 71V547S100PFG?

The 71V547S100PFG is rated for 100 MHz operation (tCYC = 15 ns minimum), with guaranteed 95 MHz performance (8 ns clock-to-data access) across industrial temperature range. This frequency is achievable under specified 3.3V ±5% supply and proper AC loading conditions per Figure 1 in the datasheet.

Does the 71V547S100PFG support true zero bus turnaround?

Yes, the 71V547S100PFG implements ZBT™ (Zero Bus Turnaround) architecture, eliminating dead cycles between read and write operations. This is achieved via synchronous control logic and flow-through outputs - allowing immediate bus direction reversal without external OE coordination or added latency.

How does burst mode work on the 71V547S100PFG?

Burst mode on the 71V547S100PFG is initiated by sampling ADV/LD = HIGH after an initial address load. The on-chip counter then generates four consecutive addresses based on LBO state (linear or interleaved). Each burst word appears one clock cycle after the previous, with no additional address setup required.

What is the function of the CEN pin on the 71V547S100PFG?

The CEN (Clock Enable) pin on the 71V547S100PFG suspends all synchronous operation when sampled HIGH at the rising CLK edge. Internal registers retain their state, outputs remain unchanged, and no new accesses occur - enabling precise clock gating for power management without data loss or reinitialization.

Can the 71V547S100PFG operate in industrial temperature environments?

Yes, the 71V547S100PFG is qualified for industrial temperature operation from –40°C to +85°C, with full DC and AC specifications guaranteed across this range. Its 3.3V ±5% supply tolerance and robust timing margins ensure reliable performance in uncooled industrial enclosures and telecom line cards.