Renesas 7025L20JI8

Overview

7025L20JI8 from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 20 ns max read cycle time, 1 µA typical standby current, and industrial temperature range (–40°C to +85°C). It supports simultaneous reads of the same memory location and is used in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7025L20JI8 datasheet, 7025L20JI8 pinout, 7025L20JI8 application, or 7025L20JI8 equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH, semaphore flag support (8 flags via A0–A2), and 2V data retention capability for battery backup operation.

Technical Context

The 7025L20JI8 implements full on-chip hardware semaphore signaling using eight dedicated flags addressed by A0–A2, enabling atomic resource locking between ports. Its port arbitration logic resolves contention via BUSY assertion-either address-match or chip-enable triggered-with priority set-up time tAPS = 5 ns guaranteed across all speed grades.

It operates fully asynchronously from either port, with separate upper-byte (UB/UBR) and lower-byte (LB/LBR) controls for multiplexed bus compatibility. The device supports MASTER/SLAVE cascading for 32-bit+ word systems without external logic, where M/S = H configures BUSY as output (Master) and M/S = L configures BUSY as input (Slave).

Key Specifications

Pinout & Package

7025L20JI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, body size ≈ 1.15 in × 1.15 in × 0.17 in, suitable for automated assembly and industrial thermal cycling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C38098B-20JCIN, the 7025L20JI8 uniquely integrates hardware semaphore flags, 2V data retention, and M/S-configurable BUSY arbitration-making it the only option for deterministic, battery-backed, industrial-grade dual-processor synchronization without external logic.

Availability

7025L20JI8 is available at Aetrix Electronics and suitable for industrial PLC memory buffers, avionics sensor fusion modules, and medical imaging data pipelines requiring stable component supply across extended product lifecycles.

Supply support for 7025L20JI8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics.

The 7025L20JI8 belongs to IDT's legacy high-speed dual-port SRAM family, designed specifically for deterministic inter-processor communication in real-time industrial, aerospace, and medical systems demanding hardware-enforced synchronization and battery-backed reliability.

FAQ

What is the maximum operating temperature range for the 7025L20JI8?

The 7025L20JI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per the datasheet's Recommended DC Operating Conditions table and applies across all functional modes including active, standby, and data retention. The 7025L20JI8 does not support military-grade (–55°C to +125°C) operation.

Does the 7025L20JI8 support true simultaneous read access to the same memory location from both ports?

Yes, the 7025L20JI8 features true dual-ported memory cells that permit simultaneous reads of identical addresses from left and right ports without contention or delay. This capability is explicitly stated in the "Features" section and confirmed by the Functional Block Diagram and Truth Table I, which show independent I/O paths and control logic for each port.

How does the BUSY flag function on the 7025L20JI8 when configured as a Master versus Slave?

When M/S = H (Master), BUSYL/BUSYR are outputs asserting during port contention; when M/S = L (Slave), BUSYL/BUSYR become inputs accepting arbitration signals from a Master device. This dual-mode behavior is defined in Note 1 of the Functional Block Diagram and verified in Truth Table II and Timing Waveforms (drw 13–14).

What is the minimum supply voltage required to maintain data integrity in retention mode for the 7025L20JI8?

The 7025L20JI8 guarantees data retention down to 2.0 V (VDR = 2.0 V), as specified in Table 10 ("Data Retention Characteristics"). This applies only to the 'L' (low-power) version and is measured at TA = +25°C; the device enters retention mode automatically when VCC drops below operational thresholds while CE remains asserted.

Can the 7025L20JI8 be used in a 32-bit data bus configuration without external logic?

Yes-the 7025L20JI8 supports MASTER/SLAVE cascading via the M/S pin to construct wider data paths. Two devices can be combined into a 32-bit system using IDT's documented approach, eliminating discrete logic. This is confirmed in the "Description" section and referenced in Pin Configuration notes for PLG84/FP84 packages.