Renesas 71V2546S100BG8

Overview

71V2546S100BG8 from IDT (now Renesas) is a 128K × 36-bit, 4.5 Mbit synchronous ZBT™ SRAM with pipelined outputs, 3.3V core supply, 2.5V I/O, and 100 MHz operation (10 ns clock-to-data access). It implements zero bus turnaround for dead-cycle-free read/write transitions and supports 4-word linear or interleaved burst mode via internal counter. Used in high-speed packet buffering and network switch fabric control planes.

For engineers reviewing the 71V2546S100BG8 datasheet, 71V2546S100BG8 pinout, 71V2546S100BG8 application, or 71V2546S100BG8 equivalent, key selection criteria include ZBT timing compliance, TQFP-100 package compatibility, 2.5V I/O voltage tolerance, industrial temperature support (–40°C to +85°C), and burst counter control via ADV/LD and LBO pins.

Technical Context

This SRAM uses fully synchronous, positive-edge-triggered registers for address, data, and control signals, enabling full pipelining with two-cycle latency from address/control registration to data output. The on-chip burst counter advances on rising CLK when ADV/LD = HIGH, supporting both linear and interleaved sequences selected by LBO.

ZBT architecture eliminates bus turnaround delay by allowing immediate read-after-write or write-after-read transitions without wait states. Output enable (OE) is asynchronous but internally synchronized, and chip enable logic (CE1/CE2/CE2) permits depth expansion while ensuring pending transfers complete before tri-state.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch. 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 CY7C1315KV18-100BZI and AS7C3256A-10JCN, the 71V2546S100BG8 uniquely delivers native 36-bit width, ZBT dead-cycle elimination, and integrated burst sequencing-making it irreplaceable in high-throughput telecom buffering where deterministic latency and bus efficiency are critical.

Availability

71V2546S100BG8 is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric control, baseband processor caching, industrial PLC FIFOs, and high-reliability embedded instrumentation requiring stable component supply across extended temperature ranges.

Supply support for 71V2546S100BG8 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, and interface ICs for communications, computing, and industrial markets.

The 71V2546S100BG8 belongs to IDT's ZBT SRAM product line, engineered specifically for zero-latency bus turnaround in packet-switched network infrastructure and real-time control systems demanding deterministic memory access.

FAQ

What is the maximum operating frequency of the 71V2546S100BG8?

The 71V2546S100BG8 is rated for 100 MHz operation (10 ns clock cycle), delivering guaranteed 10 ns clock-to-data access time under commercial and industrial temperature conditions with 3.3V ±5% VDD and 2.5V VDDQ. This frequency is validated across the full –40°C to +85°C range and supports sustained burst-mode operation without derating.

Does the 71V2546S100BG8 support true ZBTTM (Zero Bus Turnaround) behavior?

Yes, the 71V2546S100BG8 implements genuine ZBTTM functionality: it eliminates dead cycles between consecutive read and write operations by overlapping bus direction changes with data transfer. This is achieved through internal timing control and does not require external OE or turnaround logic-verified in the synchronous truth table and functional timing diagrams.

What package type and pin count does the 71V2546S100BG8 use?

The 71V2546S100BG8 is packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP) with 14 mm × 20 mm body size and 0.5 mm lead pitch. Pin 64 supports ZZ (sleep mode) on the latest die revision, and pins 14, 16, and 66 tolerate VIH ≥ VDD without direct VDD connection.

How does burst mode work on the 71V2546S100BG8, and how is it configured?

Burst mode on the 71V2546S100BG8 delivers four consecutive data words per address using an internal counter. Sequence order (linear or interleaved) is selected by the LBO pin: tied to VSS for linear, VDD for interleaved. ADV/LD controls counter behavior-LOW loads external address, HIGH increments counter-and is sampled synchronously on CLK rise.

What are the supported temperature ranges for the 71V2546S100BG8?

The 71V2546S100BG8 is qualified for industrial temperature operation from –40°C to +85°C, verified across all electrical parameters including AC timing, DC leakage, and I/O drive strength. This rating applies to the full 100 MHz speed grade and supports deployment in base stations, industrial automation, and outdoor networking equipment.