Renesas IDT71V256SA15PZI8

Overview

IDT71V256SA15PZI8 from Renesas Electronics is a 256K (32K × 8-bit) high-speed CMOS static RAM designed for secondary cache in 3.3V processor systems. It delivers 15ns access time, operates on a single 3.3V ±0.3V supply, supports industrial temperature range (–40°C to +85°C), and features LVTTL-compatible I/O - enabling low-power, high-reliability operation in embedded computing and industrial control applications.

For engineers reviewing the IDT71V256SA15PZI8 datasheet, IDT71V256SA15PZI8 pinout, IDT71V256SA15PZI8 application, or IDT71V256SA15PZI8 equivalent, key selection criteria include standby current (≤2mA), TSOP Type I package compatibility, read/write timing margins (tAA ≤15ns, tWC ≤15ns), and industrial-grade thermal stability - all critical for cache subsystems requiring deterministic latency and long-term reliability.

Technical Context

The IDT71V256SA15PZI8 implements a full CMOS SRAM architecture with asynchronous random-access behavior, supporting independent read and write cycles via separate CS, WE, and OE controls. Its address decoder drives a 262,144-bit memory array organized as 32K words × 8 bits, with bidirectional I/O0–I/O7 pins handling data flow under TTL-level logic thresholds.

Power management is achieved through dual standby modes: TTL-level standby (ISB ≤20mA) when CS = VIH, and full CMOS-level standby (ISB1 ≤2mA) when CS > VHC and f = 0. The device guarantees <6.6mW total power consumption in full standby, with typical dissipation significantly lower - essential for thermally constrained industrial modules.

Key Specifications

Pinout & Package

Package: 28-pin TSOP Type I (PZG28), 300 mil width, JEDEC-standard thin small-outline package with gull-wing leads for reflow soldering.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed SRAM applications.

Compared with CY62128EV30LL-45ZAXI and AS6C4008-15TIN, the IDT71V256SA15PZI8 uniquely combines 15ns speed, industrial temperature range, LVTTL compatibility, and TSOP packaging - making it the only option among the three qualified for new designs in harsh-environment embedded computing.

Availability

IDT71V256SA15PZI8 is available at Aetrix Electronics and suitable for industrial PLCs, medical imaging subsystems, and railway signaling equipment requiring stable component supply across extended product lifecycles.

Supply support for IDT71V256SA15PZI8 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

Renesas Electronics is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and IoT applications.

The IDT71V256SA series was developed as part of Renesas' legacy high-speed SRAM portfolio targeting deterministic-latency cache and buffer applications in 3.3V embedded systems.

FAQ

What is the maximum operating frequency supported by the IDT71V256SA15PZI8?

The IDT71V256SA15PZI8 does not operate synchronously and has no clock input; its performance is defined by access timing parameters. With a 15ns address access time (tAA), it supports effective bus frequencies up to approximately 66MHz in systems where address and control setup/hold times are met. The IDT71V256SA15PZI8 achieves this without internal clocking, relying instead on asynchronous control signals (CS, WE, OE) for deterministic read/write cycles.

Does the IDT71V256SA15PZI8 require external pull-up resistors on its control pins?

No, the IDT71V256SA15PZI8 does not require external pull-ups on CS, WE, or OE. Its inputs meet LVTTL specifications with VIH ≥2.0V and VIL ≤0.8V at VCC = 3.3V, allowing direct connection to 3.3V logic outputs. Internal input leakage is limited to ±2µA, so clean signal sources driving these pins within spec eliminate need for biasing components - simplifying layout for the IDT71V256SA15PZI8 in space-constrained designs.

Can the IDT71V256SA15PZI8 be used in battery-powered applications?

Yes, the IDT71V256SA15PZI8 is well-suited for battery-powered applications due to its full standby current of ≤2mA and guaranteed power dissipation below 6.6mW when CS is held HIGH and no inputs toggle. In systems with periodic wake/sleep cycles - such as portable test equipment or remote sensors - the IDT71V256SA15PZI8 maintains data integrity while minimizing quiescent drain, extending operational time between charges or battery replacements.

Is the IDT71V256SA15PZI8 RoHS compliant and lead-free?

Yes, the IDT71V256SA15PZI8 is a RoHS-compliant, lead-free device. The "G" suffix in its ordering code (PZG28 package) explicitly denotes green, halogen-free, and lead-free construction per Renesas' environmental compliance standards. This makes the IDT71V256SA15PZI8 suitable for export-controlled and environmentally regulated markets including EU, Japan, and China without additional qualification.

How does the IDT71V256SA15PZI8 handle simultaneous read and write operations?

The IDT71V256SA15PZI8 does not support true simultaneous read/write; it uses a single bidirectional data bus (I/O0–I/O7) controlled by CS, WE, and OE. A read occurs when CS and OE are LOW while WE is HIGH; a write occurs when CS and WE are LOW. The device prevents bus contention by tri-stating outputs during write cycles and disabling outputs when OE is HIGH - ensuring safe, conflict-free operation for the IDT71V256SA15PZI8 in standard microprocessor memory interfaces.