Renesas 7026S35G

Overview

7026S35G from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 35 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous access to the same memory location in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7026S35G datasheet, 7026S35G pinout, 7026S35G application, or 7026S35G equivalent, this device supports master/slave cascading for 32-bit+ bus expansion, provides push-pull BUSY flag outputs, and delivers 1.0 mA full-standby current at industrial temperature range (–40°C to +85°C).

Technical Context

The 7026S35G implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - enabling concurrent read/write operations without internal arbitration delay. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags via I/O0, supporting inter-processor synchronization without external logic.

Port arbitration is driven by chip enable (CEL/CER) and address match detection (tBAA ≤ 20 ns), with BUSY assertion configurable as output (M/S = H) or input (M/S = L). The device supports byte-selectable writes (UBL/UBR, LBL/LBR) and automatic power-down when CE is deasserted, achieving ISB3 = 1.0 mA (typ.) in full CMOS standby mode.

Key Specifications

Pinout & Package

7026S35G is supplied in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 1.15 in × 1.15 in body size and J-lead configuration. Pin 1 is marked by a corner notch; all VCC pins require local decoupling, and 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 CY7C136-35JC and IDT70V26S35PF, the 7026S35G uniquely retains 5V TTL compatibility, integrated push-pull BUSY outputs, and on-chip semaphore logic - making it irreplaceable in legacy industrial and avionics systems requiring deterministic, hardware-synchronized dual-port access without external components.

Availability

7026S35G is available at Aetrix Electronics and suitable for real-time industrial PLCs, dual-core DSP communication buffers, avionics flight control interfaces, and redundant network switch controllers requiring stable component supply across extended product lifecycles.

Supply support for 7026S35G 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

IDT (Integrated Device Technology) was a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions before its acquisition by Renesas Electronics in 2019.

The IDT7026 family was designed specifically for deterministic inter-processor communication in real-time embedded systems - delivering hardware-arbitrated dual-port SRAM with integrated semaphore logic and industrial-temperature reliability.

FAQ

What is the maximum operating temperature range certified for the 7026S35G?

The 7026S35G is rated for industrial temperature operation from –40°C to +85°C. This range is validated per the device's qualification testing and applies to all AC and DC specifications in the datasheet, including tRC = 35 ns max and ISB3 = 1.0 mA typical. Military and commercial variants exist under different suffixes, but 7026S35G specifically meets industrial-grade thermal requirements.

Does the 7026S35G support true simultaneous read/write to the same memory address?

Yes, the 7026S35G implements true dual-port memory cells that permit simultaneous access - including concurrent read and write - to the exact same memory location. When contention occurs, the on-chip BUSY logic asserts BUSYL or BUSYR to stall the later-accessing port, ensuring data integrity without external arbitration. This behavior is inherent to the silicon architecture and requires no firmware intervention.

How does the M/S pin affect BUSY signal functionality in the 7026S35G?

When M/S = H, the 7026S35G operates as a master: BUSYL and BUSYR are push-pull outputs indicating contention. When M/S = L, it operates as a slave: BUSYL and BUSYR become dedicated write-inhibit inputs. In slave mode, asserting BUSYL LOW blocks all left-port writes regardless of R/WL state - a hardware gating mechanism used in master/slave cascaded configurations to prevent race conditions.

Can the 7026S35G be used in a 32-bit data bus configuration?

Yes, the 7026S35G supports 32-bit expansion via master/slave cascading. One device is configured as master (M/S = H), another as slave (M/S = L); their BUSY signals are cross-connected to coordinate access. The IDT7026 family documentation confirms this topology enables full-speed, error-free 32-bit word access without additional discrete logic - leveraging native CE, R/W, and semaphore controls across both devices.

What is the purpose of the semaphore function in the 7026S35G, and how is it accessed?

The 7026S35G integrates eight hardware semaphore flags for inter-processor synchronization. To access them, set CEL = VIH and SEM = VIL (or CER = VIH and SEMR = VIL), then use A0–A2 to select the flag and I/O0 to write (0 = acquire, 1 = release). All 16 I/O lines reflect the flag value during reads. This eliminates software polling and provides atomic, hardware-enforced resource locking critical in real-time systems.