Renesas IDT71124S12YGI

Overview

IDT71124S12YGI from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with 12 ns access time, JEDEC center-power/GND pinout for noise reduction, TTL-compatible I/O, and single 5 V supply operation. It serves as main or cache memory in industrial embedded controllers requiring fast, fully static, asynchronous read/write cycles without refresh.

For engineers reviewing the IDT71124S12YGI datasheet, IDT71124S12YGI pinout, IDT71124S12YGI application, or IDT71124S12YGI equivalent, key selection criteria include guaranteed 12 ns commercial-grade access timing, industrial temperature support (–40°C to +85°C), SOJ-32 package compatibility, and low standby current (10 mA CMOS-level ISB1) in power-constrained systems.

Technical Context

The IDT71124S12YGI implements fully static asynchronous circuitry-no clocks or refresh required-and uses high-reliability CMOS fabrication optimized for noise immunity via its center-power/GND pin arrangement. Its control logic supports independent chip select (CS) and output enable (OE), enabling flexible bus arbitration and partial-memory disable.

It features bidirectional TTL-compatible I/O lines (I/O₀–I/O₇), a dedicated write enable (WE), and operates across 4.5–5.5 V supply with guaranteed DC parameters including VOH ≥ 2.4 V (IOH = –4 mA) and VOL ≤ 0.4 V (IOL = 8 mA). AC timing is characterized at fMAX = 1/tRC with tRC = 12 ns and tAA = 12 ns under commercial conditions-but this specific variant (YGI suffix) is rated for industrial temperature range only at 15 ns and 20 ns speeds; the "S12" speed grade is commercially qualified only.

Key Specifications

Pinout & Package

Package: 32-pin Plastic SOJ (PBG32), 400-mil width, JEDEC-standard center-power/GND pinout for reduced switching noise and improved signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-45ZSXIT and AS6C1008-12PIN, the IDT71124S12YGI uniquely delivers 12 ns performance in an industrial-rated SOJ package with JEDEC center-power/GND layout-enabling noise-critical 5 V embedded systems to retain legacy compatibility while meeting modern EMI requirements.

Availability

IDT71124S12YGI is available at Aetrix Electronics and suitable for industrial automation, medical diagnostics, and ruggedized test instrumentation requiring stable component supply, long-lifecycle support, and verified industrial temperature qualification.

Supply support for IDT71124S12YGI 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 IoT applications.

The IDT71124S12YGI belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for noise-sensitive, 5 V industrial systems needing deterministic, refresh-free memory with JEDEC-standard SOJ packaging.

FAQ

What is the operating temperature range for IDT71124S12YGI?

The IDT71124S12YGI is specified for industrial temperature operation from –40°C to +85°C. Although the "S12" speed grade is listed in the datasheet, Renesas explicitly notes that the 12 ns speed is only commercially qualified (0°C to +70°C); the YGI suffix confirms industrial qualification-but actual timing performance at 12 ns is not guaranteed across the full industrial range. For guaranteed 12 ns operation, use the commercial-grade IDT71124S12YG variant.

Is IDT71124S12YGI pin-compatible with other 32-pin SOJ SRAMs?

IDT71124S12YGI follows the JEDEC-standard 32-pin SOJ pinout with center VCC/GND, which differs from conventional edge-power SOJ layouts. While pin count and physical footprint match generic 32-pin SOJ packages, the VCC/GND placement means it is not mechanically or electrically pin-compatible with non-JEDEC SOJ SRAMs unless their pinout matches PBG32 exactly. Always verify layout against the official Renesas pin diagram.

Does IDT71124S12YGI require external refresh circuitry?

No, the IDT71124S12YGI uses fully static CMOS memory cells and requires no refresh cycles or clocks. It operates asynchronously-data remains valid as long as power and CS are stable. This eliminates refresh overhead in microcontroller or FPGA-based systems and simplifies timing-critical designs where deterministic access is mandatory.

What is the meaning of the 'YGI' suffix in IDT71124S12YGI?

The 'YGI' suffix in IDT71124S12YGI decodes as: 'Y' = green (lead-free), 'G' = 400-mil SOJ package (PBG32), and 'I' = industrial temperature grade (–40°C to +85°C). The 'S12' denotes nominal 12 ns access time, though Renesas documentation clarifies this speed grade is not production-tested across the full industrial range-only commercial-grade S12 parts carry full 12 ns timing guarantees.

Can IDT71124S12YGI interface directly with 3.3 V logic?

IDT71124S12YGI is a 5 V-only device with TTL-compatible I/O thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), but its outputs swing rail-to-rail (0–5 V) and inputs tolerate up to VCC + 0.5 V. Direct connection to 3.3 V logic is unsafe without level translation, as 5 V outputs may damage 3.3 V receivers. Use dual-supply translators or resistive dividers if interfacing with 3.3 V FPGAs or microcontrollers.