Renesas 7026S25JI8

Overview

IDT7026S25JI8 from Integrated Device Technology (IDT) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 25 ns maximum access time, TTL-compatible 5V ±10% operation, and on-chip semaphore arbitration logic-designed for real-time inter-processor communication in military-grade embedded systems requiring deterministic memory coherency.

For engineers reviewing the IDT7026S25JI8 datasheet, IDT7026S25JI8 pinout, IDT7026S25JI8 application, or IDT7026S25JI8 equivalent, key selection considerations include simultaneous port access timing, BUSY flag arbitration behavior (M/S = H/L), byte-selectable I/O control (UBL/LBL), and industrial/military temperature range compliance (-40°C to +85°C).

Technical Context

The IDT7026S25JI8 implements fully asynchronous dual-port architecture with separate address, control, and data buses per port-enabling concurrent read/write operations to any memory location without external arbitration logic. Its on-chip hardware semaphore logic supports eight shared flags accessed via A0–A2 and I/O0, with write-to-read latency of 5 ns (tSWRD) and contention window of 5 ns (tSPS).

Port arbitration uses push-pull BUSY outputs (BUSYL/BUSYR) when configured as MASTER (M/S = H), or as write-inhibit inputs when SLAVE (M/S = L). The device supports cascaded 32-bit+ word systems via Master/Slave select, with automatic power-down per port controlled by individual CE pins.

Key Specifications

Pinout & Package

84-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 1.15 in × 1.15 in × 0.17 in. All VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AC and R1EX24016AS0C-25, the IDT7026S25JI8 delivers integrated hardware semaphore and configurable BUSY arbitration in the same 84-pin PLCC footprint-reducing BOM count and enabling deterministic real-time operation across extended temperature ranges.

Availability

IDT7026S25JI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, military communications baseband processing, and redundant control system memory requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for IDT7026S25JI8 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

Integrated Device Technology (IDT), now part of Renesas Electronics, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The IDT7026S25JI8 belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency shared memory in safety-critical and real-time embedded systems with strict timing and reliability requirements.

FAQ

What is the operating temperature range specified for the IDT7026S25JI8?

The IDT7026S25JI8 is rated for industrial temperature operation from -40°C to +85°C, as confirmed by its "I" suffix and datasheet Table 2. This range applies to all electrical specifications including 25 ns access time, power consumption, and BUSY arbitration timing-making it suitable for harsh-environment embedded deployments.

How does the M/S pin affect BUSY signal behavior on the IDT7026S25JI8?

When M/S = H, the IDT7026S25JI8 operates as MASTER: BUSYL and BUSYR are push-pull outputs indicating port contention. When M/S = L, it operates as SLAVE: BUSYL and BUSYR become write-inhibit inputs-allowing external arbitration logic to control write gating without internal arbitration.

Can the IDT7026S25JI8 support 32-bit data bus expansion, and how is it implemented?

Yes-the IDT7026S25JI8 supports 32-bit expansion using Master/Slave cascading. One device is configured as MASTER (M/S = H), others as SLAVE (M/S = L). The MASTER's BUSY outputs coordinate arbitration across the array, enabling full-speed error-free operation without additional discrete logic.

What is the function of the semaphore logic in the IDT7026S25JI8, and how is it accessed?

The IDT7026S25JI8 includes eight hardware semaphore flags accessed via A0–A2 address lines and I/O0 data line. To use them, set CE = VIH and SEM = VIL. Writes to I/O0 update the selected flag; reads return the flag value across all 16 I/O pins-enabling lock-free synchronization between ports.

Does the IDT7026S25JI8 require external pull-up resistors on BUSY pins?

No-BUSYL and BUSYR are push-pull outputs in MASTER mode (M/S = H), eliminating the need for external pull-ups. In SLAVE mode (M/S = L), they function as CMOS inputs with no external biasing required. This simplifies PCB layout and improves noise immunity in high-reliability systems.