Renesas 71V546S133PFGI

Overview

71V546S133PFGI from Integrated Device Technology (IDT) is a 3.3V, 128K × 36-bit synchronous SRAM with Zero Bus Turnaround (ZBT™) architecture, pipelined outputs, and 4-word burst capability. It operates at 133 MHz (7.5 ns cycle time), delivers 4.2 ns clock-to-data access, and supports linear or interleaved burst ordering via the LBO pin. It is used in high-speed packet buffering and network switch fabric control planes.

For engineers reviewing the 71V546S133PFGI datasheet, 71V546S133PFGI pinout, 71V546S133PFGI application, or 71V546S133PFGI equivalent, key selection criteria include ZBT™ bus turnaround elimination, synchronous 3.3V operation with CEN/ADV/LD control logic, JEDEC-standard 100-pin TQFP packaging, and industrial temperature support (–40°C to +85°C).

Technical Context

The 71V546S133PFGI implements a fully synchronous, clock-edge-triggered architecture where address, control, and data registers are sampled on the rising edge of CLK. All inputs except OE are synchronous, and internal pipelining ensures data output occurs two cycles after address/control registration.

Its ZBT™ feature eliminates dead cycles between read/write transitions by decoupling bus direction control from memory access timing. The on-chip 4-word burst counter-configured via ADV/LD and LBO-enables efficient sequential access without external address generation, reducing controller overhead in telecom and networking datapaths.

Key Specifications

Pinout & Package

Packaged in a JEDEC-standard 100-pin thin quad flatpack (TQFP), 14 mm × 20 mm body size, with exposed pad not electrically connected. Pin 14 is NC but requires VIH > 2.0 V if left unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1355BV18-133BZI and AS7C312836B-133BIN, the 71V546S133PFGI uniquely delivers deterministic zero-turnaround operation and integrated burst addressing-critical for latency-sensitive telecom and networking control plane memory.

Availability

71V546S133PFGI is available at Aetrix Electronics and suitable for network packet buffering, telecom switch fabric control, and industrial PLC data logging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 71V546S133PFGI 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

Integrated Device Technology (IDT), now part of Renesas Electronics, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT71V546 product line was engineered specifically for high-speed, low-latency buffering in packet-switched infrastructure-emphasizing ZBT™ architecture, burst efficiency, and industrial-grade reliability.

FAQ

What is the maximum operating frequency of the 71V546S133PFGI?

The 71V546S133PFGI is rated for a maximum clock frequency of 133 MHz, corresponding to a 7.5 ns clock cycle time. This specification is guaranteed across the full industrial temperature range (–40°C to +85°C) and 3.3 V ±5% supply voltage. The 71V546S133PFGI achieves this speed using a high-volume 3.3V CMOS process and registered I/O architecture that minimizes propagation delay.

Does the 71V546S133PFGI support true ZBT™ (Zero Bus Turnaround) operation?

Yes, the 71V546S133PFGI implements true ZBT™ functionality: it eliminates dead cycles between consecutive read and write operations by decoupling bus direction control from memory access timing. This is achieved through internal synchronization and pipelined output registers, allowing immediate transition from read data valid to write data setup without external bus arbitration or wait-state insertion.

How does the burst counter function in the 71V546S133PFGI?

The 71V546S133PFGI contains an on-chip 4-word burst counter controlled by the ADV/LD and LBO pins. When ADV/LD is sampled HIGH on a clock edge, the counter advances; when sampled LOW, a new external address is loaded. LBO selects linear (LBO = LOW) or interleaved (LBO = HIGH) burst order. The counter wraps automatically after four words, enabling efficient sequential access without external address increment logic.

What are the voltage and temperature specifications for the 71V546S133PFGI?

The 71V546S133PFGI operates from a single 3.3 V ±5% supply (3.135 V to 3.465 V) and is qualified for industrial temperature range: –40°C to +85°C ambient. Absolute maximum ratings include –0.5 V to +4.6 V on input pins and –0.5 V to VDD+0.5 V on I/O pins. The 71V546S133PFGI meets these specs without derating under specified load and timing conditions.

Can the 71V546S133PFGI be used with asynchronous controllers?

No-the 71V546S133PFGI is a fully synchronous SRAM: all address, control, and data signals (except OE) are registered on the rising edge of CLK and require strict setup/hold timing. Asynchronous controllers must be adapted with clock-domain bridging logic or external registers. OE remains asynchronous and can be tied LOW for continuous output enable, but all other timing dependencies remain strictly synchronous to CLK.