Renesas 7024L17J8

Overview

7024L17J8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 17 ns maximum read cycle time (commercial grade), 2V data retention capability, and full on-chip semaphore arbitration logic - deployed in real-time inter-processor communication systems requiring simultaneous access to shared memory without external logic.

For engineers reviewing the 7024L17J8 datasheet, 7024L17J8 pinout, 7024L17J8 application, or 7024L17J8 equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = H/L configuration, low-power standby current (1 µA typical), and compatibility with 5V ±10% TTL-level control interfaces.

Technical Context

The 7024L17J8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent read/write access to any memory location. Its on-chip arbitration logic resolves port contention via BUSY flag assertion and supports semaphore signaling using dedicated SEM pins and A0–A2 address lines.

It features two distinct power modes: active operation at 750 mW typical (5V supply) and ultra-low standby at 1 µA typical (2V battery backup), enabled by independent CE control per port and CMOS-level input threshold support for ISB3/ISB4 states.

Key Specifications

Pinout & Package

7024L17J8 is packaged in an 84-pin PLCC (Plastic Leaded Chip Carrier) with 0.050″ lead pitch and body size ≈ 1.15″ × 1.15″ × 0.17″. Pin functions are electrically identical across PLCC, PGA, Flatpack, and TQFP variants per datasheet note (4).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-15JC and AS7C34098B-15JC, the 7024L17J8 uniquely delivers integrated hardware semaphore arbitration, M/S-configurable cascading, and 2V data retention - reducing BOM count by 4 components and enabling drop-in replacement in existing IDT-based 5V dual-port memory systems.

Availability

7024L17J8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC memory coherency requiring stable component supply across extended product lifecycles.

Supply support for 7024L17J8 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, acquired by Renesas Electronics in 2019.

The 7024L17J8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor memory sharing in avionics, test equipment, and industrial control systems.

FAQ

What is the maximum operating frequency supported by the 7024L17J8?

The 7024L17J8 does not operate on a clock; its maximum effective throughput is determined by the 17 ns read cycle time (tRC), enabling up to 58.8 million memory accesses per second per port under ideal asynchronous conditions. This value is validated for commercial temperature range (0°C to +70°C) with 5.0 V ±10% supply.

Does the 7024L17J8 support battery backup operation, and what voltage is required?

Yes, the 7024L17J8 supports battery backup operation with guaranteed data retention at VCC = 2.0 V minimum. The L-suffix variant achieves this with ISB3 ≤ 1 µA typical, allowing multi-year retention on small coin-cell batteries - a feature confirmed in datasheet Table 10 and Figure 5 waveform.

How does the Master/Slave (M/S) pin affect BUSY signal behavior on the 7024L17J8?

When M/S = H, BUSYL/BUSYR are outputs indicating port contention; when M/S = L, they become inputs that must be driven low by the master to enable writes. This configuration allows daisy-chained expansion - verified in Functional Description section and Truth Table I of the 7024S/L datasheet.

Can the 7024L17J8 perform simultaneous read operations on both ports without arbitration delay?

Yes - the 7024L17J8's true dual-port architecture permits concurrent reads from identical or different addresses on left and right ports with no BUSY assertion or timing penalty. This is explicitly stated in the Features list ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and confirmed in Timing Waveform Figure 7.

What package type is used for the 7024L17J8, and are pinouts compatible with other IDT7024 variants?

The 7024L17J8 uses an 84-pin PLCC package (PLG84), and its pinout is functionally identical to IDT7024 devices in PGA, Flatpack, and TQFP packages per datasheet Note 4. All variants share the same signal mapping, including CEL/CER, R/WL/R/WR, and SEM/INT/BUSY pin assignments.