Renesas 7025S17PF8

Overview

7025S17PF8 from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 17 ns maximum read cycle time (tRC), TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous read 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 7025S17PF8 datasheet, 7025S17PF8 pinout, 7025S17PF8 application, or 7025S17PF8 equivalent, key selection considerations include BUSY arbitration timing (tBAA ≤ 17 ns), semaphore flag support (8 flags via A0–A2), battery backup data retention at 2 V (L-version only), and compatibility with 84-pin PLCC packaging for legacy industrial control and military avionics designs.

Technical Context

The 7025S17PF8 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 contention via BUSY flag assertion (M/S = H) or BUSY input (M/S = L), with priority set-up time tAPS = 5 ns and BUSY disable-to-valid-data delay tBDD ≤ 18 ns.

It integrates full hardware semaphore signaling (SEML/SEMR), interrupt flag generation (INTL/INTR), and byte-selectable I/O (UBL/LBL, UBR/LBR) for multiplexed bus interfacing. The device uses CMOS technology and supports both RAM array access (SEM = VIH) and semaphore register access (SEM = VIL) under distinct enable conditions.

Key Specifications

Pinout & Package

7025S17PF8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch and JEDEC MO-047AC outline. Pin 1 is located at the index corner; pins are numbered counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C3256A-15JCN, the 7025S17PF8 uniquely delivers true dual-port operation with integrated arbitration, semaphore, and interrupt logic in a legacy-compatible 84-pin PLCC-making it irreplaceable for deterministic real-time inter-processor communication where latency and hardware locking are design-critical.

Availability

7025S17PF8 is available at Aetrix Electronics and suitable for real-time industrial PLCs, military avionics data buffers, and DSP-based radar signal processing systems requiring stable component supply across extended product lifecycles.

Supply support for 7025S17PF8 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 high-performance silicon solutions, now part of Renesas Electronics.

The 7025S17PF8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in industrial control, aerospace, and defense systems where hardware arbitration and semaphore support are mandatory.

FAQ

What is the maximum operating speed of the 7025S17PF8?

The 7025S17PF8 has a maximum read cycle time (tRC) of 17 ns, corresponding to a theoretical peak throughput of approximately 58.8 MHz for consecutive reads. This speed is guaranteed over the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply, with all AC parameters-including tAA (address access), tACE (chip enable access), and tAOE (output enable access)-specified at ≤17 ns.

Does the 7025S17PF8 support battery backup for data retention?

No-the 7025S17PF8 is the 'S' (standard power) variant and does not support battery backup data retention. Only the 'L' (low-power) variant (e.g., 7025L17PF8) guarantees data retention at 2 V with typical ICCDR ≤ 100 µA. The 7025S17PF8 requires continuous 5 V supply for volatile operation and will lose data upon power loss.

How does the M/S pin affect BUSY signal behavior in the 7025S17PF8?

When M/S = HIGH, the 7025S17PF8 operates as a master: BUSYL and BUSYR become outputs that assert during port contention to block conflicting writes. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs, allowing an external master to gate writes on this device. This configuration enables scalable multi-device systems without external arbitration logic.

Can the 7025S17PF8 be used in a single-port configuration?

Yes-the 7025S17PF8 can operate with only one port active by holding the opposing port's chip enable (CEL or CER) high and disabling its associated control signals. All timing and DC specifications remain valid for the active port, and standby current (ISB2) drops to 105 mA (typ.) under these conditions. This mode simplifies integration into legacy 16-bit bus systems while preserving upgrade path to dual-port use.

What is the purpose of the semaphore flags in the 7025S17PF8?

The 7025S17PF8 includes eight hardware semaphore flags accessed via I/O0–I/O15 and addressed by A0–A2 when SEM = VIL. These flags provide atomic, hardware-enforced mutual exclusion for shared resources between ports-eliminating race conditions in real-time multitasking. Each flag can be individually written (via I/O0) and read (via I/O0–I/O15), enabling efficient resource locking without software overhead or external logic.