Renesas 71024S15TYG8

Overview

71024S15TYG8 from Renesas Electronics is a 128K × 8 (1 Mbit) high-speed CMOS static RAM with 15 ns access time, industrial temperature range (–40°C to +85°C), TTL-compatible I/O, and dual chip select plus output enable control. It operates from a single 5.0 V ±10% supply and is used in real-time embedded controllers requiring deterministic, no-refresh memory access.

For engineers reviewing the 71024S15TYG8 datasheet, 71024S15TYG8 pinout, 71024S15TYG8 application, or 71024S15TYG8 equivalent, key selection criteria include access time consistency (tAA = tRC = 15 ns), low standby current (ISB1 = 10 mA), SOJ-32 package compatibility, and industrial-grade reliability for avionics data buffers and programmable logic controller memory expansion.

Technical Context

The 71024S15TYG8 implements fully static asynchronous architecture-no clocks or refresh cycles required-and uses high-reliability CMOS process technology to achieve guaranteed 15 ns read/write cycle times across –40°C to +85°C. Its bidirectional I/O pins support direct TTL-level interfacing without level-shifting circuitry.

Two independent chip selects (CS1, CS2) enable hierarchical memory mapping, while the dedicated OE pin allows output gating with 7 ns enable-to-valid delay. Power management includes three distinct standby modes: ISB (TTL-level deselect), ISB1 (CMOS-level full standby), and dynamic ICC = 155 mA at fMAX.

Key Specifications

Pinout & Package

71024S15TYG8 is housed in a 32-pin Plastic SOJ (Small Outline J-Lead) package with 300-mil body width (PJG32). Pin 1 is located at the top-left corner when viewing the top side with marking visible; leads are gull-wing shaped for reliable solder joint formation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-45ZSXIT and AS6C4008-55TIN, the 71024S15TYG8 delivers 15 ns access at 5 V with industrial temperature support - making it the only option among the three qualified for real-time embedded systems requiring guaranteed sub-20 ns latency across –40°C to +85°C.

Availability

71024S15TYG8 is available at Aetrix Electronics and suitable for industrial PLC data buffering, avionics sensor caching, and radar signal processing applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 71024S15TYG8 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 headquartered in Tokyo, Japan, specializing in microcontrollers, analog, power, and memory solutions for automotive, industrial, and infrastructure markets.

The 71024S15TYG8 belongs to Renesas' legacy high-speed parallel SRAM product line, designed specifically for deterministic, no-refresh memory subsystems in real-time industrial and aerospace control systems.

FAQ

What is the operating voltage range for the 71024S15TYG8?

The 71024S15TYG8 operates from a single 5.0 V supply with a specified range of 4.5 V to 5.5 V. This 5 V tolerance ensures compatibility with legacy TTL and CMOS logic families without requiring additional voltage regulation. The device's VIH and VIL thresholds are defined relative to this supply, and all AC timing parameters-including the 15 ns access time-are guaranteed across the full 4.5–5.5 V range and –40°C to +85°C temperature span.

Does the 71024S15TYG8 require a clock or refresh signal?

No, the 71024S15TYG8 is a fully static RAM and requires neither a clock nor periodic refresh cycles. Its internal circuitry uses only combinational and latch-based logic, enabling true asynchronous operation. This eliminates timing dependencies found in DRAM, simplifies system design, and guarantees deterministic access latency-critical for hard real-time applications such as motion control and flight data acquisition where the 71024S15TYG8 is commonly deployed.

What is the function of the NC pin on the 71024S15TYG8?

Pin 1 of the 71024S15TYG8 is designated NC (No Connect) and must remain unconnected in the PCB layout. This pin has no internal connection and serves only as a mechanical alignment marker. Connecting it to any net-including ground or VCC-may cause undefined behavior or damage. The datasheet explicitly prohibits routing or soldering to this pin, and its presence aligns with the PJG32 SOJ package standard used across Renesas' parallel SRAM family.

How does the dual chip select (CS1/CS2) architecture of the 71024S15TYG8 improve system design?

The dual chip select architecture of the 71024S15TYG8 allows hierarchical memory decoding: CS1 and CS2 can be driven by separate address decoder outputs to enable banked memory configurations without external logic gates. For example, one bank may activate on CS1=L/CS2=H, another on CS1=H/CS2=L-effectively doubling usable density per address bus. This reduces glue logic count and improves signal integrity versus single-CS alternatives, directly benefiting compact industrial controller designs using the 71024S15TYG8.

Is the 71024S15TYG8 RoHS-compliant and lead-free?

Yes, the 71024S15TYG8 is a green, RoHS-compliant device with lead-free terminations and halogen-free packaging, as confirmed in Renesas' ordering information and "Restricted hazardous substance device" documentation dated March 2021. The 'G' suffix in the part number explicitly denotes green compliance, and the PJG32 package meets JEDEC JS709B and IPC-1752A material declaration requirements-making the 71024S15TYG8 suitable for medical, industrial, and aerospace applications with strict environmental compliance mandates.