Renesas IDT71024S20Y8

Overview

IDT71024S20Y8 from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with 20 ns access and cycle times, industrial temperature range (–40°C to +85°C), and TTL-compatible bidirectional I/O. It operates from a single 5.0 V ±10% supply, features dual chip selects (CS1, CS2) and an independent output enable (OE), and is used in real-time control buffers, legacy industrial PLCs, and embedded instrumentation requiring deterministic, no-refresh memory access.

For engineers reviewing the IDT71024S20Y8 datasheet, IDT71024S20Y8 pinout, IDT71024S20Y8 application, or IDT71024S20Y8 equivalent, key selection criteria include guaranteed 20 ns tAA/tRC timing under industrial conditions, ISB1 standby current of 10 mA at full CMOS-level deselect, and SOJ-32 package compatibility with legacy board layouts.

Technical Context

The IDT71024S20Y8 implements fully static asynchronous architecture-no clocks, no refresh cycles-enabling seamless integration into microcontroller-based systems where bus arbitration and deterministic latency are critical. Its dual chip select logic supports hierarchical memory mapping, while OE-controlled output gating allows shared data bus operation without external bus transceivers.

Timing is defined by overlapping active-low CS1 and active-high CS2, with write operations gated by WE and read outputs enabled only when OE is low. All inputs meet TTL voltage thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and I/O capacitance is specified at 8 pF (CI/O), ensuring signal integrity in 5 V bus environments.

Key Specifications

Pinout & Package

Package: 32-pin Plastic SOJ (Small Outline J-Lead), 300-mil body width (PJG32), lead finish Pb-free (Green).

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 AS6C1008-20PCN, the IDT71024S20Y8 uniquely delivers 20 ns industrial-grade timing in a drop-in SOJ-32 footprint with native 5 V operation-critical for sustaining legacy 5 V embedded systems without redesign.

Availability

IDT71024S20Y8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics maintenance terminals, and medical diagnostic imaging systems requiring stable component supply and long-term obsolescence management.

Supply support for IDT71024S20Y8 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 enterprise applications.

The IDT71024S20Y8 belongs to Renesas' legacy high-speed parallel SRAM product line, designed specifically for 5 V embedded systems needing deterministic, no-refresh memory with industrial temperature resilience and pin-compatible upgrade paths from earlier IDT71024 variants.

FAQ

What is the maximum operating temperature range for the IDT71024S20Y8?

The IDT71024S20Y8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters in the datasheet, including 20 ns access time (tAA) and 20 ns cycle time (tRC). The device uses Renesas' qualified industrial process and undergoes extended burn-in and characterization to ensure reliability within this full range. No derating is required for timing or current consumption at temperature extremes.

Does the IDT71024S20Y8 require a clock or refresh signal?

No, the IDT71024S20Y8 is a fully static asynchronous SRAM and requires no clock, refresh, or periodic access to retain data. Its internal circuitry maintains stored bits indefinitely as long as VCC remains within 4.5 V to 5.5 V and ambient temperature stays within –40°C to +85°C. This eliminates timing-critical refresh routines in MCU or FPGA firmware and simplifies system-level design compared to DRAM-based solutions.

What are the valid logic levels for input pins on the IDT71024S20Y8?

The IDT71024S20Y8 accepts TTL-compatible input levels: VIH (input high voltage) is guaranteed ≥2.2 V, and VIL (input low voltage) is guaranteed ≤0.8 V, with VCC = 5.0 V ±10%. These thresholds ensure reliable interfacing with standard 5 V microcontrollers, CPLDs, and discrete logic families without external level shifters. Input leakage current is limited to ±5 µA across the full operating range.

How does chip select logic work on the IDT71024S20Y8?

The IDT71024S20Y8 uses dual chip select inputs: CS1 (active-low) and CS2 (active-high). The device is selected only when CS1 is LOW and CS2 is HIGH simultaneously. If either CS1 is HIGH or CS2 is LOW, the device enters standby mode (ISB or ISB1), disabling outputs and reducing current draw. This two-signal scheme supports flexible memory mapping and prevents partial selection during bus transitions.

Is the IDT71024S20Y8 RoHS-compliant and lead-free?

Yes, the IDT71024S20Y8 is a Green (lead-free) device per Renesas' ordering nomenclature - the "G" suffix in the part number confirms compliance with RoHS Directive 2011/65/EU. It uses matte tin lead finish on the SOJ-32 package and contains no intentionally added lead, mercury, cadmium, hexavalent chromium, PBB, or PBDE. Full material declarations and test reports are available through Renesas' official product page.