Renesas 7026S20G

Overview

IDT7026S20G from IDT (now Renesas) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time (commercial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write to the same memory location in real-time inter-processor communication systems.

For engineers reviewing the IDT7026S20G datasheet, IDT7026S20G pinout, IDT7026S20G application, or IDT7026S20G equivalent, key selection considerations include BUSY flag timing (tBAA ≤20 ns), master/slave port arbitration, byte-selectable I/O control (UBL/LBL), and industrial-temperature availability in 84-pin PLCC.

Technical Context

The IDT7026S20G implements fully asynchronous dual-port operation with separate address, control, and data buses per port - enabling concurrent CPU/DSP access without external logic. Its on-chip arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) that assert when both ports attempt access to identical addresses, with priority determined by tAPS (5 ns setup).

It integrates full hardware semaphore support via dedicated SEM pins and A0–A2 address decoding for eight shared flags, allowing inter-processor synchronization without software polling. The device supports cascaded 32-bit+ word expansion using M/S select and automatic power-down via CE-controlled standby modes (ISB1 ≤30 mA at 20 ns speed).

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), 1.15 in × 1.15 in footprint, lead-free and RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Compared with CY7C136-20VC and AS7C31026B-20JC, the IDT7026S20G uniquely delivers 5V TTL compatibility, push-pull BUSY outputs eliminating external components, and full on-chip semaphore arbitration - reducing system-level design complexity for real-time embedded applications.

Availability

IDT7026S20G is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial motion control applications requiring stable component supply across commercial temperature ranges.

Supply support for IDT7026S20G 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 (formerly Integrated Device Technology) is a global semiconductor leader specializing in microcontrollers, analog, power management, and memory solutions for industrial, automotive, and communications markets.

The IDT7026S20G belongs to the IDT7026 family of high-speed dual-port SRAMs designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems.

FAQ

What is the maximum operating frequency supported by the IDT7026S20G?

The IDT7026S20G does not operate at a fixed clock frequency but supports asynchronous operation with a 20 ns maximum access time (tAA). This corresponds to an effective maximum random-access throughput of approximately 50 MHz in best-case conditions. System-level timing depends on external bus controller design and must respect all AC parameters including tRC (read cycle time), tWC (write cycle time), and BUSY arbitration windows.

Does the IDT7026S20G support industrial temperature range operation?

No - the IDT7026S20G is rated for commercial temperature range only (0°C to +70°C). For industrial operation (−40°C to +85°C), the IDT7026S20J variant is specified. The 'G' suffix denotes commercial-grade PLCC packaging, while 'J' indicates industrial-grade ceramic PGA or PLCC variants with extended thermal validation.

How does the M/S pin affect BUSY functionality in the IDT7026S20G?

When M/S = HIGH, the IDT7026S20G operates as a master: BUSYL and BUSYR are push-pull outputs asserting during address contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven LOW. This enables daisy-chained configurations where one master arbitrates multiple slaves without external logic.

Can the IDT7026S20G be used in a 32-bit data bus configuration?

Yes - the IDT7026S20G supports 32-bit expansion via master/slave cascading. Two devices are connected with M/S = HIGH on the master and M/S = LOW on the slave; BUSY outputs from the master feed BUSY inputs of the slave. The IDT7026S20G's built-in arbitration logic ensures full-speed, error-free operation without additional discrete logic, as confirmed in the functional description section of the datasheet.

What is the purpose of the SEM pins on the IDT7026S20G?

The SEML and SEMR pins on the IDT7026S20G enable hardware semaphore register access. When CE = VIH and SEM = VIH, the device enters semaphore mode - allowing eight shared flags to be written via I/O0 and read across all I/O lines (I/O0–I/O15) using A0–A2 as address bits. This provides atomic inter-processor synchronization without software polling or external latches.