Renesas IDT71024S12TYI8

Overview

IDT71024S12TYI8 from Renesas Electronics is a 128K × 8-bit (1 Mbit) high-speed CMOS static RAM with 12 ns access time, industrial temperature range (–40°C to +85°C), and single 5V supply operation. It features TTL-compatible bidirectional I/O, dual chip selects (CS1/CS2), and output enable (OE) for fast read cycles down to 6 ns. Used in legacy industrial controllers and real-time data buffering where asynchronous, no-refresh memory is required.

For engineers reviewing the IDT71024S12TYI8 datasheet, IDT71024S12TYI8 pinout, IDT71024S12TYI8 application, or IDT71024S12TYI8 equivalent, key selection criteria include guaranteed 12 ns access time at industrial temperature, SOJ-32 package compatibility, low standby current (10 mA ISB1), and direct replacement feasibility in aging 5V SRAM-based systems.

Technical Context

The IDT71024S12TYI8 implements fully static asynchronous circuitry-no clocks or refresh cycles required-and uses high-reliability CMOS technology optimized for deterministic timing. Its dual chip select architecture supports hierarchical memory decoding, while OE-controlled output gating enables bus sharing without external transceivers.

All inputs and outputs are TTL-compatible (VIH = 2.2 V min, VIL = 0.8 V max), and the device operates across VCC = 4.5–5.5 V. Standby modes include TTL-level (ISB = 40 mA) and CMOS-level (ISB1 = 10 mA) power-down, activated via voltage-threshold detection on CS1/CS2.

Key Specifications

Pinout & Package

32-pin Plastic SOJ (PJG32), 300-mil body width, 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 asynchronous SRAM applications.

Compared with CY62128EV30LL-10ZSXIT and AS6C1008-12PIN, the IDT71024S12TYI8 uniquely delivers 12 ns performance at 5 V with full industrial temperature support and TTL-compatible signaling-making it the only viable option for drop-in upgrades in legacy 5 V industrial hardware.

Availability

IDT71024S12TYI8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics subsystems, and legacy test equipment requiring stable component supply, long-lifecycle support, and verified pin-and-timing compatibility with original IDT designs.

Supply support for IDT71024S12TYI8 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 IDT71024S12TYI8 belongs to Renesas' legacy high-speed CMOS SRAM product line, designed specifically for deterministic, no-refresh memory interfacing in 5V embedded control and instrumentation systems.

FAQ

What is the maximum guaranteed access time for IDT71024S12TYI8 across its full industrial temperature range?

The IDT71024S12TYI8 has a maximum guaranteed address access time (tAA) of 12 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, 2021. The 12 ns rating applies to all operating conditions within those bounds, ensuring deterministic timing for hard real-time applications.

Does IDT71024S12TYI8 support true bidirectional I/O without external direction control logic?

Yes, IDT71024S12TYI8 supports true bidirectional I/O through internal control driven by WE and chip select states. When CS1 is LOW, CS2 is HIGH, and WE is HIGH, the I/O pins function as outputs; when WE is LOW, they become inputs. No external transceiver or direction pin is needed. This behavior is confirmed in the Truth Table (Table 1) and timing waveforms for Read Cycle No. 1 and Write Cycle No. 1 in the Renesas datasheet.

What is the difference between ISB and ISB1 standby current specifications for IDT71024S12TYI8?

IDT71024S12TYI8 defines two standby modes: ISB (40 mA max) activates when CS1 ≥ VIH or CS2 ≤ VIL (TTL-level deselect), while ISB1 (10 mA max) activates when CS1 ≥ VHC or CS2 ≤ VLC (CMOS-level deselect). ISB1 achieves deeper power savings but requires stricter input voltage thresholds. Both are tested at VCC = 5.5 V and f = 0, as specified in Table 7 of the Renesas datasheet.

Is IDT71024S12TYI8 pin-compatible with earlier IDT71024 speed grades like IDT71024S15TYI8?

Yes, IDT71024S12TYI8 is pin-compatible with other IDT71024Sxx variants including IDT71024S15TYI8 and IDT71024S20TYI8. All share identical 32-pin SOJ (PJG32) packaging, pinout, and DC/AC interface definitions. The only differences are AC timing parameters (e.g., tAA, tRC) and corresponding dynamic current values - confirmed in Tables 7 and 9 of the Renesas datasheet.

Can IDT71024S12TYI8 operate reliably with VCC = 4.75 V, and what are the implications for VOH/VOL?

Yes, IDT71024S12TYI8 is fully specified for VCC = 4.5 V to 5.5 V. At VCC = 4.75 V, VOH remains ≥2.4 V (min) with IOH = –4 mA, and VOL stays ≤0.4 V (max) with IOL = 8 mA, per Table 4 (DC Electrical Characteristics). These margins ensure robust TTL-level interoperability even at the lower edge of the supply range, critical for systems with aging power supplies or underspecified regulators.