Renesas 7024L35JI

Overview

7024L35JI from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 35 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 signaling, and master/slave arbitration for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7024L35JI datasheet, 7024L35JI pinout, 7024L35JI application, or 7024L35JI equivalent, key selection considerations include BUSY-flag arbitration timing (tBDD ≤ 35 ns), battery-backed data retention at 2V, low standby current (1 µA typ.), and compatibility with 84-pin PGA (GU84) and 100-pin TQFP packages.

Technical Context

The 7024L35JI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-enabling concurrent reads/writes to any memory location, including simultaneous reads of identical addresses. Its on-chip arbitration logic resolves port contention via BUSY flag assertion and priority set-up (tAPS = 5 ns).

It integrates full hardware semaphore support (8 flags addressed by A0–A2), interrupt flag generation (INTL/INTR), and separate upper/lower byte enables (UBL/UBR, LBL/LBR) for multiplexed bus interfacing. The L-version delivers ultra-low standby power (1 µA typ.) and 2V data retention, distinguishing it from the S-version.

Key Specifications

Pinout & Package

7024L35JI is available in 84-pin PGA (GU84) and 100-pin TQFP (PNG100) packages. Both are leaded ceramic/molded plastic packages rated for industrial temperature operation and designed for high-reliability board mounting.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-35JC and AS7C34098B-35PC, the 7024L35JI uniquely integrates hardware semaphore, BUSY-flag arbitration, and M/S cascading-reducing BOM count and eliminating timing-critical software arbitration in multi-processor systems.

Availability

7024L35JI is available at Aetrix Electronics and suitable for real-time motion control, avionics data logging, and industrial PLC memory hub applications requiring stable component supply, long-lifecycle support, and guaranteed industrial-temperature performance.

Supply support for 7024L35JI 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, and RF solutions, now part of Renesas Electronics.

The 7024L35JI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered for deterministic inter-processor communication in aerospace, industrial automation, and test equipment where hardware-enforced arbitration is mandatory.

FAQ

What is the maximum operating frequency supported by the 7024L35JI?

The 7024L35JI does not operate at a fixed clock frequency but supports asynchronous operation with a maximum read cycle time (tRC) of 35 ns, enabling sustained dual-port data rates up to 28.6 MHz. Its fully combinational address decoding and lack of internal clocking mean timing is governed solely by setup/hold and access specifications-not a system clock.

Does the 7024L35JI support battery backup operation, and what is the minimum retention voltage?

Yes, the 7024L35JI supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in Table 10. In this mode, it draws only 1 µA typical standby current (ISB3), allowing multi-year retention on small backup cells-critical for avionics and medical devices requiring nonvolatile state preservation during main power loss.

How does the M/S pin configure master vs. slave behavior in multi-device systems?

When M/S = HIGH, the 7024L35JI operates as a master: BUSYL/BUSYR become outputs that assert during port contention. When M/S = LOW, it operates as a slave: BUSYL/BUSYR become inputs that accept BUSY signals from a master device. This enables seamless cascading of multiple 7024L35JI units into wider data buses (e.g., 32-bit) without external arbitration logic.

What is the function of the semaphore flags, and how are they accessed?

The 7024L35JI includes eight hardware semaphore flags accessed via the SEM pin and address lines A0–A2. When SEM = LOW and CE = HIGH (or UB & LB = HIGH), writes to I/O0 latch a flag; reads return the flag state across all 16 I/O pins. This provides atomic, glitch-free inter-processor synchronization without software overhead or external latches.

Which package types are offered for the 7024L35JI, and are both pin-compatible?

The 7024L35JI is offered in 84-pin PGA (GU84) and 100-pin TQFP (PNG100) packages. These are not pin-compatible: GU84 uses a square grid with power/ground distributed across corners and edges, while PNG100 adds NC pins and reorganizes I/O placement. Designers must select one package and route accordingly-no mechanical or electrical interchangeability exists between them.