Renesas 71256SA20PZGI8

Overview

71256SA20PZGI8 from Renesas Electronics is a 32K × 8-bit (262,144-bit) high-speed CMOS static RAM operating at 5V with 20 ns access time and industrial temperature range (–40°C to +85°C), packaged in 28-pin TSOP (PZG28). It features TTL-compatible bidirectional I/O, single-chip-select plus output-enable control, and low-power standby modes for embedded memory buffering in real-time control systems.

For engineers reviewing the 71256SA20PZGI8 datasheet, 71256SA20PZGI8 pinout, 71256SA20PZGI8 application, or 71256SA20PZGI8 equivalent, key selection criteria include verified 20 ns read/write cycle timing, industrial-grade reliability, TSOP-28 package compatibility, and direct replacement feasibility within legacy SRAM-based microcontroller interfaces and FPGA configuration buffers.

Technical Context

The 71256SA20PZGI8 implements fully static asynchronous operation-no clocks or refresh required-and uses high-reliability CMOS technology optimized for deterministic timing across voltage (4.5 V–5.5 V) and temperature extremes. Its dual standby modes (TTL-level ISB = 40 mA, CMOS-level ISB1 = 15 mA) enable dynamic power scaling based on chip-select logic level.

Timing is governed by strict AC parameters including tAA = 20 ns (address access), tRC = 20 ns (read cycle), tWC = 20 ns (write cycle), and tOE = 10 ns (output enable delay), all guaranteed over –40°C to +85°C. The device supports WE-controlled and CS-controlled write cycles with defined setup/hold (tAS = 0 ns, tDH = 0 ns) and data-valid windows (tDW = 11 ns).

Key Specifications

Pinout & Package

71256SA20PZGI8 is housed in a 28-pin TSOP Type I (PZG28) package with 300-mil width and JEDEC-standard pinout. Pin functions are electrically identical across DIP/SOJ/TSOP variants per Renesas documentation.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar static RAM applications.

Compared with CY62128EV30LL-45ZSXI and AS6C4008-20TIN, the 71256SA20PZGI8 delivers proven 5V/20 ns performance in mature industrial systems, while AS6C4008-20TIN offers modern reliability enhancements and AS6C4008-20TIN provides true pin-compatible upgrade path without layout change.

Availability

71256SA20PZGI8 is available at Aetrix Electronics and suitable for industrial automation, FPGA configuration, legacy microcontroller expansion, and real-time data logging requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 71256SA20PZGI8 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 infrastructure markets.

The 71256SA20PZGI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for robust, low-latency memory expansion in mission-critical industrial and embedded control systems.

FAQ

What is the maximum operating temperature range for the 71256SA20PZGI8?

The 71256SA20PZGI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC electrical parameters in the Renesas datasheet, making it suitable for deployment in harsh environments such as factory automation controllers and outdoor telemetry units where thermal stability is critical. The 71256SA20PZGI8 maintains full 20 ns timing compliance throughout this range.

Does the 71256SA20PZGI8 require a clock or refresh signal to retain data?

No, the 71256SA20PZGI8 uses fully static CMOS memory architecture and requires neither a clock nor periodic refresh cycles to retain stored data. As long as VCC remains within 4.5 V–5.5 V and the device is not deselected for extended periods beyond data retention limits, contents persist indefinitely. This eliminates timing-critical refresh overhead in firmware and simplifies integration with microcontrollers lacking dedicated DRAM controllers.

What is the function of the ISB1 standby current specification for the 71256SA20PZGI8?

The ISB1 specification (15 mA max) defines the supply current drawn when the 71256SA20PZGI8 is held in deep standby via CMOS-level chip deselect (CS > VHC). This mode reduces power consumption significantly compared to TTL-level standby (ISB = 40 mA), enabling energy-efficient sleep states in battery-powered or thermally constrained applications. The 71256SA20PZGI8 automatically enters ISB1 when CS exceeds VHC, independent of OE or WE state.

Can the 71256SA20PZGI8 be used as a direct replacement for older 28-pin SRAMs like the 62256?

The 71256SA20PZGI8 shares identical pinout, voltage, and functional behavior with the industry-standard 62256 family, including A0–A14, I/O0–I/O7, CS, WE, and OE assignments. However, its 20 ns speed and industrial qualification exceed baseline 62256 specs. For designs originally using slower 62256 variants, the 71256SA20PZGI8 operates as a performance-enhancing drop-in replacement-provided PCB layout accommodates TSOP-28 mechanical dimensions and thermal profile.

What package type does the 71256SA20PZGI8 use, and is it RoHS compliant?

The 71256SA20PZGI8 uses a 28-pin TSOP Type I (PZG28) package with 300-mil width and 0.55 mm lead pitch. Per Renesas ordering information and datasheet revision history, this variant is explicitly designated as "Green" - meaning it is lead-free and fully RoHS compliant, with no restricted hazardous substances. The "G" suffix in PZG28 confirms compliance, and the "I8" suffix indicates tape-and-reel packaging for automated assembly.