Renesas 71V3578S150PFG

Overview

71V3578S150PFG from IDT is a 256K × 18-bit, 3.3V synchronous SRAM with pipelined outputs, 150MHz clock speed (3.8ns access), burst counter, and single-cycle deselect. It supports linear/interleaved burst modes via LBO input, features global and byte-level write control, and operates across commercial temperature range (0°C to +70°C) in a 100-pin TQFP package. Used in high-speed networking buffers and cache subsystems requiring deterministic latency.

For engineers reviewing the 71V3578S150PFG datasheet, 71V3578S150PFG pinout, 71V3578S150PFG application, or 71V3578S150PFG equivalent, key selection criteria include burst mode timing compliance, ZZ sleep-mode current (30mA max), VDD/VDDQ supply separation, and compatibility with 3.3V I/O interfaces in pipelined memory subsystems.

Technical Context

The 71V3578S150PFG implements a synchronous, clock-driven architecture with registered address, data, and control inputs. Its internal burst counter advances on ADV=LOW and generates four consecutive 18-bit words per address, with output pipelining delivering first data one clock cycle after address latch.

Burst order is selected statically via LBO: LOW enables linear sequence (00→01→10→11), HIGH selects interleaved (00→01→11→10). Write operations support global (GW) or individual byte (BW1–BW2) enable, with BWE gating byte writes and GW overriding all byte controls.

Key Specifications

Pinout & Package

Packaged in JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), 14 mm × 20 mm body, 0.5 mm pitch. Pin 1 marked by corner notch; pins 14 (VDD/NC) and 64 (ZZ control) have specific biasing options per datasheet.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1315KV18-167BZI and AS7C3256A-15TIN, the 71V3578S150PFG delivers superior timing determinism via pipelined outputs and integrated burst logic, while its dual-supply architecture provides better signal integrity in noise-sensitive applications like avionics and test equipment.

Availability

71V3578S150PFG is available at Aetrix Electronics and suitable for high-speed networking buffers, real-time DSP cache modules, and industrial PLC memory subsystems requiring stable component supply and long-term obsolescence planning.

Supply support for 71V3578S150PFG 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) is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The 71V3578S150PFG belongs to IDT's pipelined burst synchronous SRAM product line, engineered for deterministic latency and high-throughput data buffering in systems where CPU-to-memory bandwidth is a critical bottleneck.

FAQ

What memory organization does the 71V3578S150PFG implement?

The 71V3578S150PFG implements a 256K × 18-bit organization, providing 4.6 Mbit total capacity with an 18-bit data bus width. This configuration supports efficient interfacing to 32-bit processors using two devices per 32-bit word, and is distinct from the 128K × 36-bit variant (71V3576S150PFG). The 71V3578S150PFG uses address pins A0–A17 to fully decode the 256K depth.

How does burst mode operate on the 71V3578S150PFG?

Burst mode on the 71V3578S150PFG delivers four consecutive 18-bit words per address assertion. Initiated by ADV=LOW, the internal counter advances automatically; LBO selects linear (00→01→10→11) or interleaved (00→01→11→10) sequence. First data appears pipelined one clock cycle after address latch, with subsequent words on the next three rising CLK edges - no additional address setup required.

What is the function of the ZZ pin on the 71V3578S150PFG?

The ZZ pin on the 71V3578S150PFG is an asynchronous sleep mode input. When driven HIGH, it gates the internal clock and reduces supply current to 30 mA (max) while retaining data. The pin has an internal pull-down, so it defaults to active mode if left unconnected. Recovery requires tZZR ≥100 ns after ZZ returns LOW before valid accesses resume.

Does the 71V3578S150PFG support byte-level writes?

Yes, the 71V3578S150PFG supports byte-level writes via BW1 and BW2 inputs, controlled by BWE. BW1 manages I/O0–I/O8 and I/OP1 (9 bits), BW2 manages I/O9–I/O17 and I/OP2 (9 bits). When BWE=LOW and a BWx input is LOW, only that 9-bit segment is written; all other outputs go high-Z. Global Write (GW) overrides all byte controls and writes the full 18-bit word.

What package and pin count does the 71V3578S150PFG use?

The 71V3578S150PFG uses a JEDEC-standard 100-pin plastic thin quad flatpack (TQFP), designated PKG100, with 14 mm × 20 mm body size and 0.5 mm lead pitch. Pin 1 is identified by a corner notch; pins 14 (VDD/NC) and 64 (ZZ) have configurable biasing options per the datasheet - pin 14 may be tied to VDD, driven ≥VIH, or left floating.