Renesas 7024L35JI8

Overview

7024L35JI8 from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 35 ns maximum read cycle time (tRC), 2V data retention capability, and full on-chip semaphore arbitration logic - deployed in real-time embedded systems requiring concurrent CPU/DSP memory access without external logic.

For engineers reviewing the 7024L35JI8 datasheet, 7024L35JI8 pinout, 7024L35JI8 application, or 7024L35JI8 equivalent, this page delivers verified timing specs, master/slave port arbitration behavior, battery backup operation details, industrial temperature support (–40°C to +85°C), and exact PLCC-84 pin mapping per official IDT documentation.

Technical Context

The 7024L35JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses for left and right ports, enabling simultaneous reads from the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag signaling and supports both master (BUSY output) and slave (BUSY input) configurations using the M/S pin.

It integrates full hardware semaphore support across eight flags (addressed by A0–A2), with dedicated SEM, INT, and BUSY signals per port. The device operates at 5.0 V ±10% with TTL-compatible inputs and outputs, and enters ultra-low-power standby mode (<1 mW typ.) when CE is deasserted.

Key Specifications

Pinout & Package

7024L35JI8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC) with 0.050" lead pitch and body size ≈ 1.15 in × 1.15 in × 0.17 in. Pin 1 is marked by a corner notch; all VCC and GND pins must be connected per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-35AC and IDT70V24L35PF, the 7024L35JI8 uniquely combines 5 V operation, 2 V data retention, industrial temperature range, and PLCC-84 packaging - making it irreplaceable in legacy 5 V industrial systems requiring battery-backed dual-port memory.

Availability

7024L35JI8 is available at Aetrix Electronics and suitable for real-time DSP co-processing, redundant controller memory sharing, industrial PLC I/O buffering, and legacy bus interface bridging requiring stable component supply across extended product lifecycles.

Supply support for 7024L35JI8 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 IDT7024 family was designed specifically for high-reliability dual-processor and real-time embedded systems requiring deterministic, contention-free memory access - targeting industrial automation, aerospace avionics, and telecom infrastructure.

FAQ

What is the guaranteed maximum access time for the 7024L35JI8?

The 7024L35JI8 guarantees a maximum read cycle time (tRC) of 35 ns across its full industrial temperature range (–40°C to +85°C) and supply voltage (4.5 V to 5.5 V). This value is production-tested and applies to both ports under worst-case conditions, ensuring deterministic timing for real-time systems. The 7024L35JI8 does not specify faster variants - 35 ns is its rated speed grade.

Does the 7024L35JI8 support battery backup operation, and what voltage is required?

Yes, the 7024L35JI8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR), as specified in Table 10 of the datasheet. In this mode, typical data retention current is 100 µA, enabling multi-year hold time on small backup cells. The 7024L35JI8 achieves this with its low ISB3 standby current (0.2 µA typ.), distinguishing it from the higher-power S-version.

How does the Master/Slave (M/S) pin configure arbitration behavior in the 7024L35JI8?

When M/S = HIGH, the 7024L35JI8 operates as a Master: BUSYL and BUSYR become output signals that assert during port contention, blocking writes on the contending port. When M/S = LOW, it operates as a Slave: BUSYL and BUSYR become inputs, allowing external master arbitration. This enables scalable cascading - e.g., one master coordinating multiple slave 7024L35JI8 devices in a 64-bit memory system.

What package type is used for the 7024L35JI8, and are there thermal or mounting considerations?

The 7024L35JI8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package with body dimensions approximately 1.15 in × 1.15 in × 0.17 in. It requires standard PLCC socket or reflow soldering with preheat, soak, and peak profiles compliant with IPC-J-STD-020. Thermal design must account for 750 mW typical active power dissipation - adequate copper pour and airflow are recommended for continuous operation at +85°C.

Can the 7024L35JI8 perform simultaneous read operations from both ports to the same memory address?

Yes, the 7024L35JI8 features true dual-ported memory cells that permit simultaneous reads from identical addresses on the left and right ports without contention, delay, or data corruption. This capability is explicitly stated in the "Features" section and is fundamental to its use in CPU/DSP co-processing architectures where deterministic latency is mandatory.