Renesas IDT71024S20TYI

Overview

IDT71024S20TYI from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with industrial temperature range (–40°C to +85°C), 20 ns access time, 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 data buffering for industrial controllers and legacy embedded systems requiring asynchronous, non-refreshed memory.

For engineers reviewing the IDT71024S20TYI datasheet, IDT71024S20TYI pinout, IDT71024S20TYI application, or IDT71024S20TYI equivalent, key selection criteria include guaranteed tAA ≤ 20 ns at industrial temperature, ISB1 standby current of 10 mA max, SOJ-32 package compatibility, and direct support for WE/CS1/CS2/OE-controlled read/write cycles without clocks or refresh.

Technical Context

The IDT71024S20TYI implements fully static asynchronous operation with no clock or refresh circuitry required. Its bidirectional TTL-compatible I/Os interface directly with legacy microcontrollers and FPGAs, while dual chip selects (CS1, CS2) and dedicated OE enable flexible memory banking and bus arbitration.

It uses high-reliability CMOS process technology optimized for stable 5 V operation across –40°C to +85°C. Standby modes include TTL-level ISB (40 mA max) and CMOS-level ISB1 (10 mA max), activated via voltage-threshold detection on CS1/CS2, supporting low-power sleep states in battery-backed systems.

Key Specifications

Pinout & Package

Package: 32-pin Plastic SOJ (300-mil width, PJG32), surface-mount, gull-wing leads. Pin 1 marked by notch or bevel; top-view orientation per datasheet drawing 2964 drw 02.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-45ZSXIT and AS6C1008-20TIN, the IDT71024S20TYI uniquely retains dual active-level chip selects, full 5 V tolerance, and industrial-grade 20 ns timing - making it irreplaceable in legacy 5 V systems requiring hierarchical memory decoding and guaranteed sub-20 ns latency.

Availability

IDT71024S20TYI is available at Aetrix Electronics and suitable for industrial PLCs, legacy CNC controllers, railway signaling modules, and avionics BIT equipment requiring stable component supply across long product lifecycles.

Supply support for IDT71024S20TYI 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 industrial, automotive, and infrastructure markets.

The IDT71024S20TYI belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for backward-compatible memory upgrades in 5 V industrial control and instrumentation systems where reliability and timing predictability are critical.

FAQ

What is the maximum guaranteed access time for IDT71024S20TYI across its full operating temperature range?

The IDT71024S20TYI has a maximum guaranteed address access time (tAA) of 20 ns over the full industrial temperature range of –40°C to +85°C and supply voltage range of 4.5 V to 5.5 V. This value is production-tested and specified in Table 9 of the official Renesas datasheet revision Mar.30.21, ensuring deterministic timing in real-time embedded applications without derating.

Does IDT71024S20TYI require a clock signal or periodic refresh cycles to retain data?

No, the IDT71024S20TYI is a fully static RAM and requires neither a clock signal nor periodic refresh cycles. Its internal latching circuitry maintains stored data indefinitely as long as VCC remains within specification and the device is not deselected. This eliminates timing overhead and simplifies firmware design in systems like industrial PLCs where deterministic behavior is essential.

What are the valid logic thresholds for CS2 and OE inputs on IDT71024S20TYI?

For IDT71024S20TYI, CS2 is an active-high input with VIH ≥ 2.2 V (min) and VIL ≤ 0.8 V (max); OE is active-low with identical thresholds. These values are defined in Table 4 of the datasheet and ensure robust noise margins when interfacing with standard TTL and 5 V CMOS logic families in industrial environments.

Can IDT71024S20TYI be used in a system with mixed 3.3 V and 5 V logic domains?

IDT71024S20TYI operates exclusively at 5 V (4.5–5.5 V) and features TTL-compatible I/Os, so direct connection to 3.3 V logic is not safe without level translation. Its inputs tolerate up to VCC + 0.5 V (≤ 6.0 V), but outputs swing rail-to-rail at 5 V - interfacing with 3.3 V receivers requires external buffers or resistive dividers to avoid damage or signal integrity issues.

Is the NC pin (Pin 1) on IDT71024S20TYI electrically connected internally?

No, Pin 1 on the IDT71024S20TYI is designated NC (No Connect) and has no internal electrical connection. The Renesas datasheet explicitly states this in the Pin Configuration diagram and Truth Table notes. It must remain unconnected on the PCB - routing or soldering to this pin may cause functional or reliability issues.