Renesas 7024L20JI

Overview

7024L20JI from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (industrial grade), 2V data retention capability, and full on-chip semaphore arbitration logic - deployed in real-time interprocessor communication systems requiring simultaneous, conflict-free memory access.

For engineers reviewing the 7024L20JI datasheet, 7024L20JI pinout, 7024L20JI application, or 7024L20JI equivalent, key selection considerations include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = H/L configuration, industrial temperature support (–40°C to +85°C), and low-power standby current (1 µA typical) for battery-backed operation.

Technical Context

The 7024L20JI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations-even to the same memory location-via true dual-ported SRAM cells. Its on-chip arbitration logic resolves port contention using BUSY flag signaling and master/slave select (M/S) configuration.

It supports semaphore flag management via dedicated SEM pins and I/O0–I/O15, with eight programmable flags addressed by A0–A2. The device operates from a single 5V ±10% supply, retains data down to 2V, and enters ultra-low-power standby (<1 µA) when both chip enables are deasserted with CMOS-level inputs.

Key Specifications

Pinout & Package

7024L20JI is packaged in an 84-pin ceramic PGA (GU84 package), with 42 pins per side, requiring all VCC and GND pins to be connected per datasheet note. Pin functions are strictly differentiated between left port (L-suffixed), right port (R-suffixed), and shared control signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-20AXC and AS7C34098B-20JIN, the 7024L20JI uniquely integrates hardware semaphore and M/S-configurable BUSY arbitration - reducing BOM count and eliminating timing-critical firmware synchronization in dual-CPU systems.

Availability

7024L20JI is available at Aetrix Electronics and suitable for industrial automation, avionics control, radar processing, and smart metering applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7024L20JI 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 since 2019.

The 7024L20JI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems demanding hardware-enforced memory coherency.

FAQ

What is the guaranteed maximum access time for the 7024L20JI across its operating temperature range?

The 7024L20JI is specified with a maximum access time of 20 ns over the full industrial temperature range (–40°C to +85°C) and 4.5 V to 5.5 V supply, as confirmed in Table 12a of the official datasheet. This value applies to tAA, tACE, and tABE parameters under standard load conditions and is production-tested for industrial-grade units.

Does the 7024L20JI support true simultaneous read operations from both ports to the same memory address?

Yes, the 7024L20JI implements true dual-ported SRAM cells that allow concurrent reads from both left and right ports to identical addresses without contention or data corruption. This capability is explicitly stated in the "Features" section and enabled by independent sense amplifiers and bitline structures per port.

How does the M/S pin affect BUSY signal behavior in the 7024L20JI?

When M/S = H, the 7024L20JI operates as Master: BUSYL and BUSYR become outputs that assert during port contention. When M/S = L, it operates as Slave: BUSYL and BUSYR become inputs used to stall local writes until the Master releases the BUSY flag - a hardware-enforced flow control mechanism documented in Figure 2740 drw 02J.

What is the minimum supply voltage required to retain data in the 7024L20JI during power loss?

The 7024L20JI guarantees data retention down to VCC = 2.0 V, as specified in Table 10 (VDR parameter). This 2V threshold is valid across all temperature grades and enables direct connection to backup lithium batteries or supercapacitors without regulation - a defining feature of the "L" (low-power) variant.

Can the 7024L20JI be used in a MASTER/SLAVE cascaded configuration to build a 32-bit wide memory system?

Yes, the 7024L20JI supports MASTER/SLAVE cascading via the M/S pin and BUSY flag routing, as described in the first bullet of the "Features" section. Multiple devices can be combined to expand data bus width to 32 bits or more while maintaining full-speed operation and eliminating external arbitration logic.