Renesas 7024S15PFI

Overview

7024S15PFI from IDT is a high-speed 4K × 16 true dual-port static RAM with independent left/right ports, 15 ns max read cycle time (commercial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous access to the same memory location and supports master/slave cascading for 32-bit+ bus expansion in real-time embedded systems.

For engineers reviewing the 7024S15PFI datasheet, 7024S15PFI pinout, 7024S15PFI application, or 7024S15PFI equivalent, key selection considerations include its dual-port arbitration timing (tBDD ≤ 30 ns), battery-backed data retention at 2V (L-version only), industrial temperature support (–40°C to +85°C), and compatibility with PLCC-84 and TQFP-100 packages.

Technical Context

The 7024S15PFI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external logic. Its on-chip arbitration logic resolves port contention via BUSY flag signaling and supports semaphore flag management across both ports using A0–A2 addressing.

It features dedicated upper-byte (UB/UBR) and lower-byte (LB/LBR) controls for multiplexed bus compatibility, full TTL-level interface compliance, and automatic power-down via chip enable (CE). The device uses CMOS high-performance fabrication, delivering typical active power of 170 mA and standby current as low as 0.2 mA (ISB3, L-version).

Key Specifications

Pinout & Package

7024S15PFI is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC) with 0.050" lead pitch and JEDEC MS-018AC footprint. The package supports standard reflow soldering and provides mechanical robustness for industrial vibration environments.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-15VC and IDT70V24L15PF, the 7024S15PFI uniquely combines 5V TTL compatibility, hardware semaphore support, and master/slave BUSY arbitration in a single PLCC-84 package-making it irreplaceable in legacy industrial and avionics systems requiring deterministic dual-port behavior without external logic.

Availability

7024S15PFI is available at Aetrix Electronics and suitable for industrial PLCs, dual-core DSP subsystems, and avionics display units requiring stable component supply across extended product lifecycles.

Supply support for 7024S15PFI 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 semiconductor company specializing in timing, memory interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7024 family was designed for high-reliability, real-time interprocessor communication in industrial control, military computing, and telecommunications infrastructure-emphasizing deterministic arbitration and seamless 5V system integration.

FAQ

What is the maximum operating frequency supported by the 7024S15PFI?

The 7024S15PFI supports a maximum read cycle time of 15 ns, corresponding to a theoretical maximum sustained data rate of 66.7 MHz for consecutive accesses. This timing is guaranteed under commercial temperature conditions (0°C to +70°C) with VCC = 5.0 V ±10%. The 7024S15PFI does not specify a clock input; its operation is fully asynchronous, so actual throughput depends on system-level control signal timing margins and bus loading.

Does the 7024S15PFI support battery backup for data retention?

The 7024S15PFI is the "S" (standard power) variant and does not support battery backup data retention. Only the "L" (low-power) variants-such as 7024L15PFI-guarantee data retention at VCC = 2.0 V with ICCDR ≤ 4000 µA (military/industrial) or ≤ 1500 µA (commercial). The 7024S15PFI retains data only while powered within its specified 4.5 V–5.5 V range.

How does the M/S pin affect BUSY flag behavior on the 7024S15PFI?

When M/S = HIGH, the 7024S15PFI operates as a master: BUSYL and BUSYR become outputs that assert when port contention occurs. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs, allowing external master devices to drive BUSY signals for synchronization. This dual-role capability enables flexible cascading in multi-device dual-port memory systems without external BUSY logic.

Can the 7024S15PFI be used in a single-port configuration?

Yes-the 7024S15PFI can operate in single-port mode by tying one port's chip enable (e.g., CER) permanently HIGH and using only the left port (CEL, A0L–A11L, I/O0L–I/O15L, etc.). All internal resources remain functional, and power consumption reduces accordingly (e.g., ISB2 ≈ 105 mA typ.). No hardware modification is needed; configuration is purely signal-driven.

What is the purpose of the semaphore flags in the 7024S15PFI?

The 7024S15PFI integrates eight hardware semaphore flags accessible via I/O0 and addressed by A0–A2. These flags provide atomic resource-locking capability between ports-allowing one port to claim exclusive access to shared memory regions without software polling or external logic. Semaphore read/write is enabled by asserting SEM = LOW while holding UB = LB = HIGH, ensuring deterministic inter-core coordination.