Renesas 71V2546S133PFG

Overview

71V2546S133PFG from IDT (now Renesas) is a 128K × 36-bit, 4.5 Mbit synchronous ZBT™ SRAM with pipelined outputs, 133 MHz operation (7.5 ns clock-to-data), 3.3 V core supply, and 2.5 V I/O supply. It supports zero-bus-turnaround for dead-cycle-free read/write transitions and is used in high-speed networking packet buffers and telecom line-card data path memory.

For engineers reviewing the 71V2546S133PFG datasheet, 71V2546S133PFG pinout, 71V2546S133PFG application, or 71V2546S133PFG equivalent, key selection criteria include burst mode support (linear/interleaved), individual byte write control (BW1–BW4), triple chip enable architecture for depth expansion, and industrial temperature range (–40°C to +85°C) compliance.

Technical Context

This SRAM implements a fully synchronous, clock-edge-triggered interface with address, data, and control registers aligned to the rising edge of CLK. Its ZBT™ architecture eliminates bus turnaround latency by overlapping address setup and data transfer across consecutive cycles.

The device integrates an on-chip 4-word burst counter controlled by ADV/LD and LBO, enabling linear or interleaved burst sequences without external logic. Output enable (OE) is internally synchronized, removing timing constraints on OE assertion/deassertion.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body, lead pitch 0.5 mm. 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 CY7C1355BV18-133BZI and AS7C3128B-133JCIN, the 71V2546S133PFG uniquely delivers ZBT™ zero-turnaround operation, 2.5 V I/O compatibility, and hardware-configurable burst sequencing - essential for legacy telecom and high-performance packet buffer designs.

Availability

71V2546S133PFG is available at Aetrix Electronics and suitable for packet buffering, telecom line card memory, and industrial real-time control applications requiring stable component supply, long-lifecycle support, and industrial-grade thermal performance.

Supply support for 71V2546S133PFG 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 company specializing in high-performance timing, memory, and interface solutions for communications and computing infrastructure.

The 71V2546S133PFG belongs to IDT's ZBT™ SRAM product line, designed specifically for high-speed, low-latency data buffering in networking equipment, base stations, and real-time embedded systems demanding deterministic access timing.

FAQ

What is the maximum operating frequency of the 71V2546S133PFG?

The 71V2546S133PFG is rated for a maximum clock frequency of 133 MHz (tCYC = 7.5 ns), verified across the industrial temperature range (–40°C to +85°C) with VDD = 3.3 V ±5% and VDDQ = 2.5 V ±10%. This frequency enables sustained back-to-back read/write operations without bus turnaround penalties due to its ZBT™ architecture.

Does the 71V2546S133PFG support burst mode, and how is it configured?

Yes, the 71V2546S133PFG supports 4-word burst mode using its internal counter. Burst sequence type - linear or interleaved - is selected by the LBO pin (LBO = VSS for linear, LBO = VDD for interleaved). Address loading versus counter increment is controlled by ADV/LD (low = load external address, high = increment).

What is the function of the three chip enable pins (CE1, CE2, CE2) on the 71V2546S133PFG?

The 71V2546S133PFG uses CE1, CE2, and CE2 as independent chip enables: CE = active when CE1 = L, CE2 = L, and CE2 = H. Any deviation deselects the device. Pending read/write transfers complete before outputs go high-impedance, ensuring data integrity during chip deselection.

How does the 71V2546S133PFG implement zero bus turnaround (ZBT™)?

The 71V2546S133PFG achieves ZBT™ by eliminating dead cycles between read and write operations through fully pipelined address and data registers, synchronized output enable, and internal burst counter logic. This allows immediate transition from write to read (or vice versa) on consecutive clock edges without bus idle time.

Is the 71V2546S133PFG available in both commercial and industrial temperature grades?

Yes, the 71V2546S133PFG is offered in industrial temperature grade (–40°C to +85°C), as confirmed in the datasheet's Recommended Operating Conditions table. The "PFG" suffix denotes the 100-pin TQFP package with industrial temperature qualification. Commercial grade variants exist but are distinct part numbers.