Renesas 7026L55JI

Overview

7026L55JI from IDT (Integrated Device Technology) is a high-speed 16K × 16 true dual-port static RAM with independent left/right ports, 55 ns maximum read cycle time, 5 V ±10% single supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access to the same memory location and integrates on-chip semaphore logic for inter-port synchronization in real-time embedded systems.

For engineers reviewing the 7026L55JI datasheet, 7026L55JI pinout, 7026L55JI application, or 7026L55JI equivalent, key selection considerations include its 55 ns access timing, 1 mW typical standby power, master/slave arbitration capability, and 84-pin PLCC package compatibility with legacy military/industrial memory subsystems.

Technical Context

The 7026L55JI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-enabling concurrent read/write operations without external arbitration logic. Its on-chip BUSY arbitration responds to address or chip-enable match events, with tBAA ≤ 45 ns and tBDD ≤ 40 ns under industrial conditions.

It features dedicated semaphore registers (8 flags, addressed via A0–A2), accessed when CE = VIH and SEM = VIL, supporting mutual exclusion in multi-processor shared-memory designs. The device uses CMOS process technology and supports byte-selectable writes via UBL/LBL and UB/RB controls on both ports.

Key Specifications

Pinout & Package

The 7026L55JI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) with 1.15 in × 1.15 in body size and J-lead configuration. 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-55AXC and IDT70V26S15PF, the 7026L55JI uniquely combines 5 V TTL compatibility, industrial temperature range, PLCC package, and hardware semaphore support-making it irreplaceable in fielded military and industrial control systems requiring drop-in longevity.

Availability

7026L55JI is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics data concentrators, dual-processor communication buffers, and military radio modems requiring stable component supply across extended product lifecycles.

Supply support for 7026L55JI 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 timing, memory, and RF solutions before its acquisition by Renesas Electronics in 2019. Known for high-reliability interface and memory ICs.

The IDT7026 family was designed specifically for deterministic, low-latency shared-memory architectures in multi-processor embedded systems-prioritizing hardware arbitration, semaphore support, and industrial/military environmental resilience over density or cost.

FAQ

What is the maximum operating temperature range for the 7026L55JI?

The 7026L55JI is rated for industrial temperature operation from –40°C to +85°C. This range is validated per manufacturer specifications and applies across all DC and AC parameters-including 55 ns access time and 0.2 mA ISB3 standby current-without derating. It is not qualified for military (–55°C to +125°C) or commercial (0°C to +70°C) grades.

Does the 7026L55JI support true simultaneous read/write to the same memory location?

Yes, the 7026L55JI implements true dual-port SRAM cells that allow independent, asynchronous access to any memory location from left and right ports. When both ports target the same address, on-chip BUSY logic asserts within ≤45 ns to stall one port while permitting the other to complete-ensuring data coherency without external logic.

How does the semaphore function work on the 7026L55JI?

The 7026L55JI provides eight hardware semaphore flags accessed via A0–A2 when CE = VIH and SEM = VIL. Each flag is written using I/O0 and read across all 16 I/O lines. Semaphore arbitration is fully hardware-managed: writing "0" claims the flag; writing "1" releases it-enabling lock-free inter-processor synchronization without software overhead.

Can the 7026L55JI be used in a master/slave configuration with other IDT7026 devices?

Yes, the 7026L55JI supports cascaded master/slave operation using the M/S pin. When M/S = H, BUSYL/BUSYR act as push-pull outputs; when M/S = L, they become write-inhibit inputs. Multiple 7026L55JI devices can be combined to build wider (e.g., 32-bit) or deeper memory arrays with centralized arbitration-no additional discrete logic required.

What is the standby current consumption of the 7026L55JI in full CMOS-input mode?

In full standby mode (ISB3), where both ports have CEL/CER > VCC – 0.2 V and all inputs held at valid CMOS levels, the 7026L55JI consumes 0.2 mA typical current. This ultra-low quiescent draw is specified across the full –40°C to +85°C range and enables energy-efficient operation in battery-backed or thermally constrained industrial systems.