Renesas 71V2546S100PFG

Overview

71V2546S100PFG from IDT (now Renesas) is a 128K × 36-bit (4.5 Mbit), 3.3V synchronous ZBT™ SRAM with 2.5V I/O, pipelined outputs, and zero-bus-turnaround architecture. It delivers 150 MHz operation (3.8 ns clock-to-data access), supports 4-word linear/interleaved burst modes via internal counter, and features individual byte write control (BW1–BW4) for precision memory management in high-speed packet buffering and network switching applications.

For engineers reviewing the 71V2546S100PFG datasheet, 71V2546S100PFG pinout, 71V2546S100PFG application, or 71V2546S100PFG equivalent, this device is selected for deterministic latency, dead-cycle-free read/write transitions, and industrial-temperature support (–40°C to +85°C) in telecom infrastructure and real-time data path designs.

Technical Context

The 71V2546S100PFG implements a fully synchronous, clock-edge-triggered architecture with address/control/data registers aligned to the rising edge of CLK. Its ZBT™ mode eliminates bus turnaround delays by enabling immediate read-after-write or write-after-read transitions without idle cycles.

It integrates an on-chip burst counter controlled by ADV/LD and LBO pins, supporting both linear and interleaved 4-word sequences. Output enable (OE) is asynchronous but internally synchronized, and Clock Enable (CEN) halts all synchronous operations while preserving register state.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, lead-free and RoHS-compliant (PFG suffix). Pin 64 supports ZZ (sleep mode) on latest die revision.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1356BV18-167BZI and AS7C31026B-10JIN, the 71V2546S100PFG uniquely delivers zero-bus-turnaround performance at 3.3V/2.5V dual-rail operation - making it irreplaceable in latency-critical, high-throughput packet buffering where burst efficiency and deterministic tCD are mandatory.

Availability

71V2546S100PFG is available at Aetrix Electronics and suitable for network packet buffering, telecom line card memory, real-time signal processing, industrial PLC data logging, and high-speed test equipment requiring stable component supply across extended product lifecycles.

Supply support for 71V2546S100PFG 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 leader in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 71V2546S100PFG belongs to IDT's ZBT™ SRAM product line, engineered specifically for zero-latency bus turnaround in high-speed networking and packet-switching infrastructure.

FAQ

What is the maximum operating frequency of the 71V2546S100PFG?

The 71V2546S100PFG is rated for up to 150 MHz operation, corresponding to a 6.67 ns clock period. This is validated across the full industrial temperature range (–40°C to +85°C) and 3.3V ±5% VDD supply, with guaranteed 3.8 ns clock-to-data access time (tCD) under specified load conditions.

Does the 71V2546S100PFG support true ZBT™ (Zero Bus Turnaround) operation?

Yes, the 71V2546S100PFG implements genuine ZBT™ architecture: it eliminates dead cycles between consecutive read and write operations. When R/W toggles mid-burst or between cycles, the device transitions seamlessly without inserting idle clocks - a feature confirmed in its functional description, truth tables, and timing diagrams.

What package type and pin count does the 71V2546S100PFG use?

The 71V2546S100PFG is supplied in a 100-pin plastic thin quad flatpack (TQFP), JEDEC standard PKG100 package, measuring 14 mm × 20 mm. The "PFG" suffix denotes lead-free, RoHS-compliant construction with matte tin finish.

How does the burst counter function in the 71V2546S100PFG?

The 71V2546S100PFG contains an on-chip 4-word burst counter controlled by ADV/LD and LBO. When ADV/LD is HIGH, the counter increments; when LOW, an external address is loaded. LBO selects linear (LBO = VSS) or interleaved (LBO = VDD) addressing - enabling flexible burst patterns without external sequencing logic.

Is the 71V2546S100PFG compatible with industrial temperature requirements?

Yes, the 71V2546S100PFG is fully specified and tested for industrial temperature operation from –40°C to +85°C. All DC and AC electrical characteristics - including tCD, tCYC, and power consumption - are guaranteed across this range, making it suitable for deployment in base stations, industrial automation, and outdoor networking equipment.