Renesas 7025L55JI

Overview

IDT7025L55JI from Integrated Device Technology (IDT) is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, 1 mA typical standby current, and industrial temperature range (–40°C to +85°C). It enables simultaneous read access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the IDT7025L55JI datasheet, IDT7025L55JI pinout, IDT7025L55JI application, or IDT7025L55JI equivalent, key selection criteria include dual-port arbitration latency, BUSY/INT flag timing, semaphore coherency support, battery-backed 2V data retention, and compatibility with TTL-level 5V ±10% supply in space-constrained industrial PLCs and military avionics interfaces.

Technical Context

The IDT7025L55JI implements full hardware port arbitration with on-chip semaphore logic, supporting eight independent semaphore flags addressed via A0–A2. Its BUSY flag operates in master mode (output) or slave mode (input), enabling deterministic contention resolution during simultaneous access to identical addresses.

It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls for multiplexed bus compatibility, and supports both R/W-controlled and CE/UB/LB-controlled write cycles. The device enters ultra-low-power standby (<1 mA typ.) when both chip enables (CEL/CER) are deasserted, retaining data down to 2V.

Key Specifications

Pinout & Package

84-pin ceramic Pin Grid Array (PLG84) package with 0.100″ pin pitch; body size ≈ 1.15 in × 1.15 in × 0.17 in; requires all VCC pins connected to 5V supply and all GND pins tied to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IDT70V25L55JGI, the IDT7025L55JI uniquely delivers integrated semaphore logic and lowest standby current (0.2 mA), making it optimal for safety-critical, battery-backed dual-processor architectures where hardware-enforced memory coherency is mandatory.

Availability

IDT7025L55JI is available at Aetrix Electronics and suitable for real-time motion control, avionics display buffering, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.

Supply support for IDT7025L55JI 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, and RF solutions before its acquisition by Renesas Electronics in 2019.

The IDT7025L55JI belongs to IDT's legacy high-speed dual-port SRAM family, designed specifically for deterministic inter-processor communication in military, aerospace, and industrial control systems demanding hardware-enforced memory coherency.

FAQ

What is the guaranteed maximum read cycle time for IDT7025L55JI?

The IDT7025L55JI has a guaranteed maximum read cycle time (tRC) of 55 ns across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply. This parameter is production-tested and applies to both left and right ports operating independently or concurrently under specified AC test conditions.

Does IDT7025L55JI support battery backup operation, and what voltage is required?

Yes, IDT7025L55JI supports battery backup operation with guaranteed data retention at VCC = 2.0 V. In this mode, typical data retention current is 100 µA (max 4000 µA over military temp range), enabling long-term memory hold during main power loss in safety-critical systems.

How does the BUSY flag operate in master versus slave configuration on IDT7025L55JI?

When M/S = HIGH, IDT7025L55JI operates as master: BUSYL/BUSYR are outputs asserting during address contention. When M/S = LOW, it operates as slave: BUSYL/BUSYR become inputs that must be driven HIGH by the master to block writes-enabling hierarchical arbitration in multi-device systems.

What is the function of the SEM pins on IDT7025L55JI, and how many semaphore flags are available?

The SEML and SEMR pins enable access to eight hardware semaphore flags. These flags are addressed via A0–A2 and read/written through I/O0–I/O15. They provide atomic, hardware-enforced synchronization between processors sharing the IDT7025L55JI memory space without software intervention.

Which package type is used for IDT7025L55JI, and what are its mechanical dimensions?

IDT7025L55JI is packaged in an 84-pin ceramic Pin Grid Array (PLG84) with approximate dimensions of 1.15 in × 1.15 in × 0.17 in. This hermetic PGA package meets MIL-PRF-38535 QML requirements and is qualified for high-reliability industrial and military applications.