Renesas 7005S25PFI8

Overview

7005S25PFI8 from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 25 ns maximum access time (commercial grade), TTL-compatible 5V ±10% supply, and integrated hardware semaphore/arbitration logic. It enables simultaneous asynchronous reads from both ports to the same memory location and supports master/slave cascading for 16-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 7005S25PFI8 datasheet, 7005S25PFI8 pinout, 7005S25PFI8 application, or 7005S25PFI8 equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 30 ns), BUSY flag arbitration (tAPS = 5 ns), interrupt flag latency (tINS/tINR ≤ 20 ns), and industrial-grade thermal operation (-40°C to +85°C) in the 64-pin TQFP package.

Technical Context

The 7005S25PFI8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A12L/I/O0L–I/O7L/CEL/OEL/R/WL on left; A0R–A12R/I/O0R–I/O7R/CER/OER/R/WR on right), enabling concurrent read/write operations without external logic. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and semaphore signaling using SEML/SEMR pins.

It supports two operational modes: as a stand-alone 64K-bit dual-port RAM or as a MASTER/SLAVE pair (via M/S pin) for wider data buses. The device uses CMOS technology with active power consumption of 155 mA (typ.) and full standby current of 1.0 mA (typ.), and retains data at 2V for battery backup applications.

Key Specifications

Pinout & Package

7005S25PFI8 is housed in a 64-pin thin quad flatpack (TQFP) with 0.5 mm pitch, compliant with JEDEC MO-159. All VCC (pins 8, 23, 47, 64) and GND (pins 7, 22, 33, 46) must be decoupled locally. Pin 1 index corner is marked by a dot or beveled edge.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C024AV-25AXC and AS7C38099B-25JCIN, the 7005S25PFI8 uniquely delivers integrated hardware semaphore, master/slave cascading, and industrial-temperature 5 V operation in a compact 64-pin footprint - critical for real-time deterministic systems where external arbitration logic adds latency and board space.

Availability

7005S25PFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, and industrial PLC memory expansion requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7005S25PFI8 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 sensor solutions, now part of Renesas Electronics since 2019.

The IDT7005 family was designed specifically for deterministic, low-latency inter-processor communication in industrial automation, avionics, and telecom infrastructure - emphasizing hardware arbitration, dual-port concurrency, and robust environmental qualification.

FAQ

What is the maximum operating temperature range for the 7005S25PFI8?

The 7005S25PFI8 is rated for industrial temperature operation from -40°C to +85°C, as confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section. This rating applies to the "S" speed grade (25 ns) and is validated across all electrical parameters including access time, power consumption, and BUSY arbitration timing.

Does the 7005S25PFI8 support battery backup operation?

Yes, the 7005S25PFI8 supports battery backup with data retention down to 2 V (VDR = 2.0 V min), as specified in Table 9. In data retention mode (CE > VHC, VIN > VHC or < VLC), ICCDR is guaranteed ≤ 4000 µA for military/industrial grades, enabling reliable operation during main power loss.

How does the M/S pin affect BUSY signal behavior on the 7005S25PFI8?

When M/S = H, the 7005S25PFI8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert LOW during port contention. When M/S = L, it operates as a slave: BUSYL and BUSYR become inputs that inhibit writes when driven LOW by a master device - enabling hierarchical multi-device arbitration.

What is the purpose of the semaphore function in the 7005S25PFI8?

The semaphore function provides eight hardware flags accessed via A0–A2 and I/O0–I/O7, controlled by SEML/SEMR. These flags enable atomic inter-port synchronization without software polling or external logic - critical for preventing race conditions in real-time multi-processor systems using the 7005S25PFI8.

Can the 7005S25PFI8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7005S25PFI8 features true dual-port memory cells that allow simultaneous reads from both left and right ports to identical addresses without conflict, arbitration delay, or data corruption - a core capability explicitly highlighted in the Features section and functional description.