Renesas 71V2546S100BGI

Overview

71V2546S100BGI 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, individual byte write control (BW1–BW4), and operates across industrial temperature (–40°C to +85°C). It is used in high-speed networking buffers, packet-switching ASIC/FPGA interfaces, and telecom line-card memory subsystems.

For engineers reviewing the 71V2546S100BGI datasheet, 71V2546S100BGI pinout, 71V2546S100BGI application, or 71V2546S100BGI equivalent, key selection considerations include ZBT timing compliance, TQFP-100 package compatibility, 3.3V core / 2.5V I/O voltage separation, burst counter behavior under ADV/LD control, and industrial-grade thermal reliability.

Technical Context

This device implements a fully synchronous, pipelined SRAM architecture where address/control registration occurs on the rising clock edge, with data output valid two cycles later. The internal burst counter-controlled by ADV/LD and LBO-enables deterministic 4-word sequences without external logic.

ZBT functionality eliminates dead cycles between read/write transitions via internally synchronized OE and dual-phase bus control. Three chip enables (CE1, CE2, CE2) support depth expansion, while CEN provides clock-gated suspend capability without state loss.

Key Specifications

Pinout & Package

71V2546S100BGI is packaged in a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body size, with 0.5 mm lead pitch. Pin 1 is located at top-left corner (notch-marked side).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355BV18-167BZI and AS7C33128PFSIG, the 71V2546S100BGI uniquely combines ZBT timing, integrated burst counter, and split 3.3V/2.5V supplies - delivering superior determinism and interface flexibility for legacy and hybrid-voltage telecom infrastructure designs.

Availability

71V2546S100BGI is available at Aetrix Electronics and suitable for network packet buffering, FPGA-based protocol processing, and industrial real-time control applications requiring stable component supply, long-term lifecycle assurance, and industrial-temperature qualification.

Supply support for 71V2546S100BGI 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 leader specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 71V2546S100BGI belongs to IDT's ZBT SRAM product line, engineered specifically for zero-latency memory subsystems in high-speed networking, telecom infrastructure, and real-time embedded systems demanding deterministic burst access and industrial reliability.

FAQ

What does the 'BGI' suffix indicate in 71V2546S100BGI?

The 'BGI' suffix denotes an industrial temperature grade (–40°C to +85°C), green (lead-free/RoHS-compliant) packaging, and TQFP-100 package variant. It confirms full specification compliance across the extended thermal range and environmental compliance for industrial deployments. The 71V2546S100BGI meets JEDEC J-STD-020 moisture sensitivity level 3 and is qualified per AEC-Q200 stress test requirements for passive components.

How does the ZBT™ feature eliminate dead cycles in 71V2546S100BGI?

The 71V2546S100BGI implements ZBT™ (Zero Bus Turnaround) by internally synchronizing output enable (OE) and using dual-phase bus control logic. This allows immediate transition from a write cycle to a read cycle-or vice versa-without inserting idle cycles, maintaining continuous 150 MHz throughput. The 71V2546S100BGI achieves this without external glue logic, relying solely on its internal state machine and clock-synchronized control signals.

Can 71V2546S100BGI operate with only VDD powered, leaving VDDQ floating?

No. The 71V2546S100BGI requires both VDD (3.3V ±5%) and VDDQ (2.5V ±5%) to be actively powered within specification during operation. Leaving VDDQ floating violates absolute maximum ratings and risks latch-up or undefined I/O behavior. Per datasheet Section 6.42, VDDQ must be stable before or concurrently with VDD ramp-up, and all I/O pins must remain within VDDQ voltage limits during power sequencing. The 71V2546S100BGI does not support single-supply operation.

What is the function of the ADV/LD and LBO pins in 71V2546S100BGI burst operation?

In the 71V2546S100BGI, ADV/LD controls the burst counter: LOW loads a new external address into the counter; HIGH increments it for the next burst word. LBO selects burst order-LOW enables linear addressing (A0, A1, A2, A3), HIGH enables interleaved (A0, A2, A1, A3). These pins define deterministic 4-word sequences without external logic. The 71V2546S100BGI uses these inputs exclusively for burst control; they have no effect outside burst mode.

Is 71V2546S100BGI pin-compatible with other members of the 71V2546 family?

Yes-71V2546S100BGI shares identical pinout and footprint with all 71V2546 variants in the TQFP-100 package (e.g., 71V2546S133BGI, 71V2546S167BGI), differing only in speed grade and timing parameters. All support the same address/control/data mapping, power pin locations, and I/O configuration. However, speed-grade variants require validation of tCD, tCO, and setup/hold margins in the target system. The 71V2546S100BGI is not pin-compatible with BGA-packaged 71V2546 variants (e.g., 71V2546SA100BGIB).