Renesas 7024S20PF

Overview

7024S20PF from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (commercial/industrial), TTL-compatible 5V ±10% supply, and 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 7024S20PF datasheet, 7024S20PF pinout, 7024S20PF application, or 7024S20PF equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = H/L configuration, battery-backed data retention at 2V (L-version), and compatibility with 84-pin PLCC packaging for legacy industrial control backplanes.

Technical Context

The 7024S20PF implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent read/write to any memory location without external logic. Its on-chip arbitration resolves port contention via BUSY flag assertion and supports master/slave cascading for 32-bit+ word expansion.

It integrates full hardware semaphore signaling (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 device operates across –40°C to +85°C (industrial grade) and retains data at VCC = 2V in low-power standby mode.

Key Specifications

Pinout & Package

7024S20PF is supplied in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050″ lead pitch and JEDEC MS-026AC outline. Pin 1 is marked by a corner notch; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-20VC and IDT70V24L20PF, the 7024S20PF uniquely delivers integrated master/slave arbitration, 5V TTL compatibility, and industrial temperature support in a single PLCC package - making it irreplaceable in legacy-reliant, real-time deterministic systems.

Availability

7024S20PF is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data interfaces, and redundant control systems requiring stable component supply across extended product lifecycles.

Supply support for 7024S20PF 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) was a fabless semiconductor company specializing in timing, memory interface, and RF solutions before its acquisition by Renesas in 2019. It pioneered high-performance dual-port SRAM architectures for real-time embedded systems.

The 7024S20PF belongs to IDT's legacy 7024S/L family of high-speed dual-port SRAMs, designed specifically for deterministic inter-processor communication in industrial, military, and aerospace applications where hardware arbitration and 5V compatibility are mandatory.

FAQ

What is the maximum operating speed of the 7024S20PF?

The 7024S20PF has a maximum access time of 20 ns, corresponding to a minimum read cycle time (tRC) of 20 ns. This rating applies across the industrial temperature range (–40°C to +85°C) and is guaranteed under VCC = 5.0 V ±10%. The 7024S20PF does not specify a maximum clock frequency because it is an asynchronous device - timing depends on control signal setup/hold and propagation delays, not a system clock.

Does the 7024S20PF support battery backup for data retention?

No - the 7024S20PF ('S' suffix) does not support battery backup data retention. Only the 'L' version (e.g., 7024L20PF) guarantees data retention at VCC = 2 V. The 7024S20PF's ISB3 full standby current is 1.0 mA (typ), whereas the L-version achieves 0.2 µA (typ) in retention mode. For battery-backed operation, the 7024L20PF must be selected instead.

How does the M/S pin affect BUSY signal behavior in the 7024S20PF?

In the 7024S20PF, the M/S pin configures arbitration role: when M/S = H (high), the device operates as master and asserts BUSYL/BUSYR as outputs to signal port contention; when M/S = L (low), it operates as slave and expects BUSY signals as inputs for synchronization. This enables daisy-chained master/slave configurations without external logic - a key feature distinguishing the 7024S20PF from basic dual-port SRAMs.

Can the 7024S20PF be used in a 32-bit data bus system?

Yes - the 7024S20PF supports 32-bit expansion via master/slave cascading. Two devices can be connected using the M/S pin: one configured as master (M/S = H), the other as slave (M/S = L). The master's BUSY output connects to the slave's BUSY input, enabling coordinated arbitration. This eliminates external logic and maintains full 20 ns performance across the combined 32-bit word width, as documented in the IDT7024 datasheet section "Expanding Data Bus Width."

What is the purpose of the semaphore function in the 7024S20PF?

The semaphore function in the 7024S20PF provides eight hardware-managed flags (addressed by A0–A2) for inter-processor synchronization. Each flag can be atomically set/cleared via SEM enable and I/O0, preventing race conditions during resource allocation. This eliminates software-based spinlocks and reduces CPU overhead - critical for real-time deterministic systems where predictable latency is required, such as motion control or avionics health monitoring.