Renesas IDT71024S15TY8

Overview

IDT71024S15TY8 from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with 15 ns access time, industrial temperature range (–40°C to +85°C), and TTL-compatible bidirectional I/O. It operates from a single 5 V supply, requires no refresh or clock, and serves as main or cache memory in embedded controllers, industrial PLCs, and legacy communication systems.

For engineers reviewing the IDT71024S15TY8 datasheet, IDT71024S15TY8 pinout, IDT71024S15TY8 application, or IDT71024S15TY8 equivalent, key selection criteria include guaranteed tAA ≤ 15 ns at industrial temp, dual chip select architecture for bank decoding, OE-controlled output timing down to 7 ns, and SOJ-32 (300 mil) package compatibility with legacy board layouts.

Technical Context

The IDT71024S15TY8 implements fully static asynchronous operation with no clocks or refresh cycles required. Its dual CS architecture (CS1 active-low, CS2 active-high) enables hierarchical memory mapping, while OE allows independent output gating without affecting internal state.

All inputs and outputs are TTL-compatible (VIH ≥ 2.2 V, VIL ≤ 0.8 V), and the device supports three standby modes: ISB (TTL-level deselect, 40 mA), ISB1 (CMOS-level full standby, 10 mA), and dynamic ICC = 155 mA at fMAX for 15 ns grade - enabling low-power operation in intermittently active systems.

Key Specifications

Pinout & Package

32-pin Plastic SOJ (300 mil width, PJG32), surface-mount package with gull-wing leads. Pin 1 marked by notch or dot; top view shown in datasheet Figure 1.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY62128EV30LL-45ZAXI and AS6C1008-15PIN, the IDT71024S15TY8 uniquely delivers 15 ns performance at 5 V in a verified SOJ-32 (300 mil) package - preserving legacy timing, voltage, and mechanical compatibility without layout changes.

Availability

IDT71024S15TY8 is available at Aetrix Electronics and suitable for industrial automation, avionics data logging, and legacy telecom equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IDT71024S15TY8 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.

The IDT71024S15TY8 belongs to Renesas' legacy high-speed parallel SRAM product line, designed specifically for 5 V systems requiring deterministic, zero-refresh memory with industrial-grade reliability and direct TTL bus compatibility.

FAQ

What is the operating voltage range for the IDT71024S15TY8?

The IDT71024S15TY8 operates from a single 5 V supply with a specified range of 4.5 V to 5.5 V. This tolerance accommodates typical 5 V rail variation in industrial power supplies and ensures compatibility with legacy TTL and CMOS logic families without level shifting. The device draws dynamic current up to 155 mA and standby current as low as 10 mA in ISB1 mode.

Does the IDT71024S15TY8 require a clock or refresh signal?

No, the IDT71024S15TY8 is a fully static RAM and requires neither a clock nor periodic refresh cycles. Its internal latches retain data indefinitely as long as power is applied and address/control signals remain stable. This eliminates timing-critical refresh overhead in microcontroller or FPGA-based systems and simplifies system design for deterministic real-time applications.

What is the meaning of "TY" in the part number IDT71024S15TY8?

In IDT71024S15TY8, "TY" denotes the 300 mil width Plastic SOJ package (PJG32). The "T" specifies SOJ construction, "Y" indicates 300 mil body width, and the trailing "8" signifies tape-and-reel packaging. This distinguishes it from "YG" variants (400 mil SOJ, PBG32) and confirms mechanical compatibility with legacy IDT71024 footprints using the narrower SOJ outline.

Can the IDT71024S15TY8 be used in place of faster or slower speed grades like IDT71024S12TY8 or IDT71024S20TY8?

Yes - the IDT71024S15TY8 is pin- and functionally compatible with other IDT71024SxxTY8 variants (e.g., S12, S20). All share identical pinout, voltage, timing control logic, and package. Slower grades may be substituted where 15 ns timing is not required; faster grades require verifying system timing margins. No PCB changes are needed for speed grade swaps within the same package and temperature grade.

What are the key timing parameters that define read and write performance of the IDT71024S15TY8?

Key read parameters include tAA = 15 ns (address-to-data valid), tOE = 7 ns (OE-to-output valid), and tOH = 4 ns (output hold after address change). For writes: tWC = 15 ns (cycle time), tWP = 12 ns (minimum WE pulse width), and tDW = 8 ns (data valid before write end). All values are guaranteed across –40°C to +85°C and 4.5–5.5 V, enabling robust timing closure in industrial environments.