Renesas 7025S20PFI8

Overview

7025S20PFI8 from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent left/right ports, 20 ns maximum access time (industrial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous read/write operations on both ports - e.g., in real-time DSP co-processing systems where one port serves a CPU and the other a DMA controller.

For engineers reviewing the 7025S20PFI8 datasheet, 7025S20PFI8 pinout, 7025S20PFI8 application, or 7025S20PFI8 equivalent, key selection criteria include bus contention resolution via BUSY flag, master/slave cascading for 32-bit+ data width, battery-backed 2V data retention, and industrial temperature support (–40°C to +85°C).

Technical Context

The 7025S20PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves port conflicts using BUSY signaling - asserted when both ports attempt simultaneous access to the same memory location. The M/S pin configures master (BUSY output) or slave (BUSY input) mode for multi-device expansion.

It supports semaphore flag management via dedicated SEM pins and A0–A2 addressing of eight hardware semaphores, enabling inter-processor synchronization without external logic. All timing parameters - including tAA (20 ns max), tRC (20 ns), and tBDD (30 ns max) - are specified over the full industrial temperature range and validated at VCC = 5.0 V ±10%.

Key Specifications

Pinout & Package

7025S20PFI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch, body size ≈ 1.15 in × 1.15 in × 0.17 in. 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 CY7C136-20JC and AS7C38098B-20JI, the 7025S20PFI8 uniquely integrates master/slave BUSY handshaking and 2V data retention - making it the only option among the three qualified for fault-tolerant, expandable, and power-loss-resilient dual-port memory architectures.

Availability

7025S20PFI8 is available at Aetrix Electronics and suitable for motor control systems, DSP co-processing platforms, and telecom line cards requiring stable component supply, long-term lifecycle assurance, and industrial-grade reliability.

Supply support for 7025S20PFI8 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, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. It delivered high-performance, low-power ICs for communications and computing infrastructure.

The 7025S series belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time embedded systems demanding deterministic latency, inter-processor synchronization, and robust industrial operation - such as industrial automation, test equipment, and military avionics.

FAQ

What is the maximum operating temperature range for the 7025S20PFI8?

The 7025S20PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all DC and AC electrical parameters, including 20 ns access time, 5V ±10% supply operation, and full functionality of BUSY arbitration and semaphore logic - making it suitable for deployment in harsh environments like factory floors and outdoor telecom cabinets.

Does the 7025S20PFI8 support battery backup for data retention?

Yes, the 7025S20PFI8 supports data retention down to VCC = 2.0 V, with ICCDR ≤ 4000 µA (military/industrial grade). This feature allows the device to preserve memory contents during main power failure when backed by a coin-cell or supercapacitor - critical for retaining configuration, calibration data, or last-known-safe states in safety-critical systems.

How does the BUSY arbitration mechanism work on the 7025S20PFI8?

The 7025S20PFI8 uses hardware-driven BUSY arbitration: when both ports attempt simultaneous access to the same memory address, the BUSY signal asserts on the contending port (if configured as slave) or indicates conflict (if master). Timing parameters tBAA (≤20 ns), tBDD (≤30 ns), and tAPS (5 ns) ensure deterministic resolution - allowing designers to implement lock-free, low-latency inter-processor communication without software polling or external logic.

Can multiple 7025S20PFI8 devices be cascaded for wider data buses?

Yes, the 7025S20PFI8 supports master/slave cascading via the M/S pin to build 32-bit or wider memory systems. When M/S = H, BUSY is an output indicating contention; when M/S = L, BUSY is an input that gates writes. This native handshaking eliminates need for external arbitration logic - enabling scalable, full-speed memory expansion in applications like high-end DSP boards and packet processors.

What package type is used for the 7025S20PFI8?

The 7025S20PFI8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, with standard 0.050" lead pitch and body dimensions approximately 1.15 in × 1.15 in × 0.17 in. This RoHS-compliant, surface-mountable package supports reflow soldering and is socket-compatible for development and repair - widely adopted in industrial and telecom hardware for its mechanical robustness and thermal performance.