Renesas 7024L20PF

Overview

7024L20PF from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns maximum access time (industrial grade), 1 mW typical standby power, and full on-chip semaphore arbitration logic-used in real-time inter-processor communication systems requiring simultaneous read/write access to shared memory.

For engineers reviewing the 7024L20PF datasheet, 7024L20PF pinout, 7024L20PF application, or 7024L20PF equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under Master/Slave configuration, battery-backed data retention at 2 V, and compatibility with 84-pin PLCC packaging for legacy industrial control backplanes.

Technical Context

The 7024L20PF implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent reads or writes-including simultaneous reads of the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion and supports semaphore signaling across ports using dedicated SEM, INT, and M/S pins.

It features TTL-compatible 5 V (±10%) single-supply operation, integrated upper/lower-byte enables (UBL/UBR, LBL/LBR), and automatic power-down via chip enable (CE). The L-version delivers ultra-low standby current (1 mW typ.) and guaranteed 2 V data retention-critical for battery-backed systems where power loss must not corrupt shared state.

Key Specifications

Pinout & Package

7024L20PF is supplied in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050″ lead pitch and 1.15″ × 1.15″ body size. Pin 1 is marked by a corner notch; all VCC and GND pins require local decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-20VXI and IS61LV25616AL-20TQLI, the 7024L20PF uniquely integrates full port arbitration, semaphore flags, and Master/Slave configuration-making it irreplaceable in hard real-time dual-CPU systems where deterministic latency and hardware-enforced coherency are mandatory.

Availability

7024L20PF is available at Aetrix Electronics and suitable for industrial PLCs, avionics subsystems, and medical imaging equipment requiring stable component supply across extended product lifecycles.

Supply support for 7024L20PF 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 high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 7024L20PF belongs to IDT's legacy dual-port SRAM family, engineered specifically for deterministic inter-processor communication in safety-critical and real-time embedded systems.

FAQ

What is the guaranteed data retention voltage for the 7024L20PF?

The 7024L20PF guarantees data retention down to 2.0 V (VDR = 2.0 V min), enabling reliable operation during brown-out conditions. At this voltage, typical data retention current is 100 µA, supporting multi-year battery backup in industrial control modules without volatile state loss.

How does the M/S pin affect arbitration behavior in the 7024L20PF?

When M/S = H, the 7024L20PF operates as Master: BUSYL/BUSYR become outputs that assert during port contention. When M/S = L, it operates as Slave: BUSYL/BUSYR become inputs, allowing external Master to control arbitration. This configuration enables scalable cascading of multiple 7024L20PF devices without additional logic.

Can the 7024L20PF perform simultaneous reads from both ports to the same memory address?

Yes-the 7024L20PF uses true dual-port memory cells that permit concurrent reads from both left and right ports to identical addresses with no timing penalty or bus contention. This capability is fundamental to its use in lock-free inter-processor data exchange and is verified across all operating temperature ranges.

What is the function of the SEM pins on the 7024L20PF?

The SEML and SEMR pins enable access to the on-chip 8-bit semaphore register. When SEM = L, the device enters semaphore mode: A0–A2 select one of eight flags, and I/O0 writes or reads the flag state. This hardware mechanism replaces software-based mutexes, reducing inter-processor synchronization latency to ≤5 ns.

Does the 7024L20PF support byte-wide writes without affecting adjacent bytes?

Yes-the 7024L20PF supports independent upper- and lower-byte writes via UBL/LBL (left port) and UBR/LBR (right port). Asserting only UBL enables writing to I/O0–I/O7 while preserving I/O8–I/O15, and vice versa. This feature is essential for mixed-data-width processor interfaces and avoids destructive read-modify-write cycles.