Renesas 7026S55J

Overview

IDT7026S55J from Integrated Device Technology (IDT) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, TTL-compatible 5 V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time interprocessor communication systems.

For engineers reviewing the IDT7026S55J datasheet, IDT7026S55J pinout, IDT7026S55J application, or IDT7026S55J equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 40 ns), dual-port I/O byte enable control (UBL/LBL, UBR/LBR), industrial temperature range (–40°C to +85°C), and 84-pin PLCC package compatibility with legacy military-grade board layouts.

Technical Context

The IDT7026S55J implements fully asynchronous dual-port architecture with separate address, control, and bidirectional data buses per port - enabling concurrent read/write operations without internal synchronization overhead. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags across both ports, with dedicated SEM pins and push-pull BUSY outputs.

Port arbitration operates via two modes: chip-enable–based (tBAC/tBDC) and address-match–based (tBAA/tBDA), both supporting M/S-selectable master (BUSY output) or slave (BUSY input) configuration. The device enters low-power standby (ISB3 ≤ 5 µA) when CE is deasserted, and supports byte-level write control via upper/lower byte enables for multiplexed bus interfacing.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), 1.15 in × 1.15 in body, lead pitch 0.05 in, RoHS-compliant green variant available.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-55JC and AS7C31026B-55JC, the IDT7026S55J uniquely integrates push-pull BUSY signaling and full on-chip semaphore management - enabling deterministic, logic-free interprocessor coordination in safety-critical or latency-sensitive systems.

Availability

IDT7026S55J is available at Aetrix Electronics and suitable for industrial automation controllers, avionics data concentrators, and real-time digital signal processing systems requiring stable component supply and long-term obsolescence management.

Supply support for IDT7026S55J 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7026S55J belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic interprocessor communication in real-time embedded systems where hardware arbitration and low-latency memory sharing are essential.

FAQ

What is the operating temperature range for IDT7026S55J?

IDT7026S55J is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the manufacturer's specification tables and applies to all DC and AC electrical parameters under 5.0 V ±10% supply conditions. The part does not support extended military temperature grades unless explicitly ordered as a derivative variant (e.g., 7026S55JQ).

Does IDT7026S55J support true simultaneous access to the same memory address?

Yes, IDT7026S55J implements true dual-port memory cells that permit simultaneous read/write access to identical addresses. When contention occurs, on-chip BUSY logic asserts BUSYL or BUSYR to stall one port, ensuring data integrity without external arbitration circuitry - a core feature confirmed in the functional block diagram and truth tables.

How does the M/S pin affect BUSY pin behavior on IDT7026S55J?

When M/S = HIGH, IDT7026S55J operates as a master: BUSYL and BUSYR are push-pull outputs indicating port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes - allowing external arbitration control. This dual-mode behavior is defined in Note 1 of the Pin Configurations section.

Can IDT7026S55J be used in a 32-bit data bus configuration?

Yes, IDT7026S55J supports 32-bit expansion via master/slave cascading. One device is configured as master (M/S = HIGH), another as slave (M/S = LOW), with BUSY outputs tied to BUSY inputs. The datasheet confirms this topology enables full-speed error-free 32-bit operation without additional discrete logic.

What is the standby current consumption of IDT7026S55J in full standby mode?

In full standby mode (ISB3), where both ports have CE high and all inputs held at CMOS logic levels, IDT7026S55J consumes ≤5 µA. This value is specified in Table 10 for the "S" speed grade at commercial/industrial temperatures and reflects actual measured performance, not typical-only data.