Renesas 7024L55JI

Overview

7024L55JI from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 55 ns max read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and battery-backed data retention down to 2V - used in real-time embedded systems requiring concurrent CPU/DSP memory access.

For engineers reviewing the 7024L55JI datasheet, 7024L55JI pinout, 7024L55JI application, or 7024L55JI equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing (tBDD ≤ 30 ns), standby current (ISB3 = 0.2 mA typ.), and 84-pin PLCC package compatibility with legacy military/industrial PCB layouts.

Technical Context

The 7024L55JI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via MASTER/SLAVE configuration using the M/S pin, generating BUSY flags and supporting semaphore signaling across both ports without external logic.

It features dedicated upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for multiplexed bus interfacing, full TTL-level compatibility, and four standby power modes - including full CMOS-level ISB3 (0.2 mA typ.) for ultra-low-power battery retention at 2V.

Key Specifications

Pinout & Package

7024L55JI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in. The package provides robust thermal performance and mechanical reliability for industrial reflow and long-term operation.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-55JC and IDT70V24L55JGI, the 7024L55JI delivers unique value through its self-contained arbitration and semaphore engine - eliminating external logic while maintaining full 5V compatibility and proven industrial reliability in legacy platforms.

Availability

7024L55JI is available at Aetrix Electronics and suitable for real-time digital signal processing, redundant controller systems, legacy military avionics interfaces, and high-speed test equipment requiring stable component supply and long-lifecycle support.

Supply support for 7024L55JI 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 7024L55JI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered for deterministic real-time memory sharing in aerospace, industrial control, and test instrumentation applications.

FAQ

What is the maximum operating temperature range for the 7024L55JI?

The 7024L55JI is rated for industrial temperature operation from –40°C to +85°C. This range is verified per manufacturer specifications and applies to all DC and AC parameters including 55 ns access time, standby current, and data retention - making it suitable for deployment in motor drives, base stations, and ruggedized field equipment where ambient thermal stress is significant.

Does the 7024L55JI support battery backup operation, and what voltage is required?

Yes, the 7024L55JI supports battery backup with guaranteed data retention down to 2.0 V (VDR = 2.0 V min). In retention mode, it draws only 100 µA typical (ICCDR), enabling multi-year operation from a small lithium cell - a key capability confirmed in the official datasheet's Data Retention Characteristics table (Table 10).

How does the MASTER/SLAVE (M/S) pin affect BUSY flag behavior on the 7024L55JI?

When M/S = H, the 7024L55JI operates as MASTER: BUSYL and BUSYR are output flags indicating port contention. When M/S = L, it operates as SLAVE: BUSYL and BUSYR become inputs for receiving arbitration signals from a master device. This dual-role capability is explicitly defined in the Pin Names table and Truth Table I, enabling flexible cascading in multi-device memory systems.

What is the standby current consumption of the 7024L55JI in full CMOS-level shutdown mode?

In full standby mode (ISB3), where both ports are disabled with CMOS-level inputs (CE > VCC − 0.2 V, VIN > VCC − 0.2 V or < 0.2 V), the 7024L55JI consumes 0.2 mA typical and 5 µA max - significantly lower than the S-version (5 mW typ.). This value is documented in Table 9a under "7024L" column for ISB3, confirming its suitability for ultra-low-power hold modes.

Can the 7024L55JI perform simultaneous reads from both ports to the same memory location?

Yes, the 7024L55JI uses true dual-ported memory cells that allow completely independent, simultaneous reads from both left and right ports to identical or different addresses - a core architectural feature highlighted in the "Features" section and functional block diagram. No arbitration delay or BUSY assertion occurs during concurrent reads, ensuring deterministic timing for mirrored data access.