Renesas IDT71024S20TYI8

Overview

IDT71024S20TYI8 from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with industrial temperature support (–40°C to +85°C), 20 ns read/write cycle 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 PLCs, legacy telecom line cards, and embedded controller memory expansion.

For engineers reviewing the IDT71024S20TYI8 datasheet, IDT71024S20TYI8 pinout, IDT71024S20TYI8 application, or IDT71024S20TYI8 equivalent, key selection criteria include access time consistency (tAA = tRC = 20 ns), low standby current (ISB1 = 10 mA), SOJ-32 package compatibility, and industrial-grade reliability without refresh circuitry.

Technical Context

The IDT71024S20TYI8 implements fully static asynchronous architecture-no clocks or refresh required-and uses high-reliability CMOS process technology optimized for deterministic timing across temperature extremes. Its bidirectional TTL-compatible I/O pins eliminate level-shifting needs in 5 V logic systems.

Two independent chip selects (CS1, CS2) and a dedicated OE pin enable flexible memory banking and bus arbitration; power-down modes are activated via CMOS-level (ISB1) or TTL-level (ISB) deselect conditions, delivering 10 mA or 40 mA standby current respectively.

Key Specifications

Pinout & Package

Package: 32-pin Plastic Small Outline J-Lead (SOJ), 300-mil body width (PJG32), lead pitch 0.050 inch, JEDEC MS-012AC compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-20ZSXIT and AS6C1008-20TIN, the IDT71024S20TYI8 uniquely delivers guaranteed 20 ns timing at –40°C to +85°C on a 5 V rail in SOJ-32, making it the only drop-in solution for legacy industrial hardware refresh without voltage or footprint changes.

Availability

IDT71024S20TYI8 is available at Aetrix Electronics and suitable for industrial PLCs, telecom line cards, embedded controller expansions, and avionics BIT equipment requiring stable component supply across full industrial temperature range and long product lifecycle.

Supply support for IDT71024S20TYI8 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.

IDT71024S20TYI8 belongs to Renesas' legacy IDT SRAM product line, designed specifically for high-reliability, pin-compatible replacements in 5 V industrial control and communications systems requiring zero-refresh memory.

FAQ

What is the maximum operating frequency supported by the IDT71024S20TYI8?

The IDT71024S20TYI8 does not operate on a clock signal-it is an asynchronous static RAM. Its performance is defined by timing parameters: read cycle time (tRC) and access time (tAA) are both guaranteed at 20 ns maximum across –40°C to +85°C. This corresponds to an effective upper limit of 50 MHz for continuous random-access patterns, but actual system throughput depends on address setup, hold, and bus turnaround constraints-not clock frequency.

Does the IDT71024S20TYI8 require refresh circuitry or external clocks?

No, the IDT71024S20TYI8 is a fully static RAM and requires neither refresh circuitry nor external clocks. Its internal latches retain data indefinitely as long as VCC is applied and inputs remain within specified DC conditions. This eliminates DRAM controller complexity and makes it ideal for simple microcontroller bus interfaces and real-time deterministic systems where timing predictability is critical.

What is the function of the NC pin on the IDT71024S20TYI8?

Pin 1 of the IDT71024S20TYI8 is marked NC (No Connect) and is internally unconnected. Per Renesas' recommended layout practices, this pin should be left floating or tied to GND to minimize noise coupling-never driven or connected to VCC. Its presence maintains SOJ-32 mechanical symmetry and ensures compatibility with standard PCB footprints used across the IDT71024 family.

Can the IDT71024S20TYI8 be used in a 3.3 V system?

The IDT71024S20TYI8 is specified for 5.0 V ±10% (4.5–5.5 V) operation only. Its input thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) and output drive strength are optimized for 5 V TTL logic families. Using it in a 3.3 V system risks VIH violation (3.3 V may fall below guaranteed recognition threshold) and excessive current draw; a true 3.3 V SRAM like CY62128EV30LL-20ZSXIT is required instead.

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

The IDT71024S20TYI8's CS1 (active-low) and CS2 (active-high) inputs enable hierarchical memory decoding: CS1 can serve as global chip enable while CS2 acts as bank select, allowing two IDT71024S20TYI8 devices to share the same address/data bus without external logic. This reduces gate count, simplifies PCB routing, and supports seamless memory expansion up to 256 KB using identical timing across both devices.