Renesas 71024S15YGI

Overview

71024S15YGI from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 15 ns access time, 5 V single-supply operation, TTL-compatible I/O, and dual chip select plus output enable control - used in real-time data buffering for industrial controllers and legacy embedded systems.

For engineers reviewing the 71024S15YGI datasheet, 71024S15YGI pinout, 71024S15YGI application, or 71024S15YGI equivalent, this page delivers verified timing parameters, SOJ-32 pin mapping, standby current specs (ISB1 = 10 mA), and direct alternatives for memory upgrade or obsolescence mitigation in long-lifecycle designs.

Technical Context

The 71024S15YGI implements fully static asynchronous architecture-no clocks or refresh required-with independent CS1/CS2 selection logic enabling banked memory addressing. Its bidirectional I/Os use TTL-compatible voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and support fast read cycles (tAA = 15 ns, tOE = 7 ns) and write cycles (tWC = 15 ns, tWP = 12 ns).

Power management includes three distinct operating states: active (ICC = 155 mA), TTL-level standby (ISB = 40 mA), and CMOS-level full standby (ISB1 = 10 mA), triggered by voltage-threshold detection on CS1/CS2. All timing parameters are guaranteed across –40°C to +85°C at VCC = 5.0 V ± 10%.

Key Specifications

Pinout & Package

71024S15YGI is supplied in a 32-pin Plastic SOJ (Shrink Outline J-Lead) package, 400 mil body width (PBG32), with gull-wing leads suitable for automated assembly and IPC Class 2 reliability requirements.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-45ZAXI and AS6C1008-15TIN, the 71024S15YGI offers native 5 V TTL signaling and proven field reliability in legacy industrial platforms, while AS6C1008-15TIN provides a direct second-source option with identical timing and package.

Availability

71024S15YGI is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, avionics maintenance terminals, and medical imaging control modules requiring stable component supply across extended product lifecycles.

Supply support for 71024S15YGI 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 Corporation is a global semiconductor leader delivering microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71024S15YGI belongs to Renesas' legacy high-speed parallel SRAM product line, designed specifically for 5 V TTL-based embedded systems requiring deterministic, no-refresh memory performance in harsh environments.

FAQ

What is the maximum guaranteed access time for the 71024S15YGI?

The 71024S15YGI has a maximum address access time (tAA) of 15 ns across its full industrial temperature range (–40°C to +85°C) at VCC = 5.0 V ± 10%. This value is production-tested and guaranteed per Renesas datasheet Table 9. The 71024S15YGI achieves this timing without requiring external wait-state generation in compatible 5 V bus architectures.

Does the 71024S15YGI require a refresh circuit or clock signal?

No, the 71024S15YGI uses fully static CMOS design and requires no refresh cycles or clock input. It operates asynchronously - data retention is maintained as long as VCC is applied and temperature remains within specification. This eliminates refresh overhead in microcontroller or FPGA-based systems, simplifying design and reducing power variability. The 71024S15YGI maintains data integrity indefinitely under valid operating conditions.

What package type and dimensions does the 71024S15YGI use?

The 71024S15YGI is packaged in a 32-pin Plastic SOJ (Shrink Outline J-Lead) with 400 mil body width (PBG32). Lead pitch is 0.05 inches (1.27 mm), body width is 10.16 mm, and total length is 20.32 mm. This package is RoHS-compliant and qualified for reflow soldering per J-STD-020. The 71024S15YGI's PBG32 footprint matches industry-standard SOJ-32 layouts.

How does the dual chip select (CS1/CS2) logic function on the 71024S15YGI?

On the 71024S15YGI, CS1 is active-low and CS2 is active-high; both must be asserted simultaneously (CS1 = L, CS2 = H) to enable memory access. This two-signal scheme prevents partial selection and supports hierarchical decoding in multi-SRAM systems. When either CS is inactive, the device enters standby mode - ISB = 40 mA (TTL-level) or ISB1 = 10 mA (CMOS-level) depending on input voltage thresholds. The 71024S15YGI truth table confirms this behavior in Table 1.

Is the 71024S15YGI compatible with 3.3 V logic interfaces?

No, the 71024S15YGI is specified for 5 V ±10% operation only and features TTL-compatible I/O thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V). Driving its inputs from 3.3 V logic may result in marginal VIH margin and is not guaranteed. Interfacing with 3.3 V systems requires level translation. The 71024S15YGI's internal circuitry and timing parameters are validated exclusively at 5 V, and no 3.3 V operation mode is defined in its datasheet.