Renesas 7025S45PFI

Overview

7025S45PFI from IDT (Integrated Device Technology) is a high-speed 8K × 16 true dual-port static RAM with independent left/right ports, 45 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and battery backup data retention at 2V - used in real-time embedded systems requiring deterministic memory coherency between two processors or DMA engines.

For engineers reviewing the 7025S45PFI datasheet, 7025S45PFI pinout, 7025S45PFI application, or 7025S45PFI equivalent, key selection considerations include its 45 ns access timing, dual-port arbitration logic, BUSY/INT flag signaling, byte-selectable I/O control, and compatibility with master/slave cascading for 32-bit+ bus expansion.

Technical Context

The 7025S45PFI implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via hardware BUSY flag generation when both ports access the same address, with priority determined by M/S pin state and tAPS setup timing.

It integrates full semaphore support using A0–A2 to select one of eight flags, writable via I/O0 and readable across all 16 I/O lines. The device supports two distinct power modes: active operation (typ. 155 mA at 45 ns) and full standby (typ. 1.0 mA with CMOS-level inputs), enabling low-power retention down to 2V.

Key Specifications

Pinout & Package

7025S45PFI is housed in a 100-pin TQFP (PNG100) package measuring 14 mm × 14 mm × 1.4 mm, with exposed thermal pad and standard 0.5 mm pitch. Pin functions are symmetrically distributed for left (L) and right (R) ports, supporting identical signal routing on both sides of the device.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-45AXI and IS61WV102416BLL-10TLI, the 7025S45PFI uniquely delivers 5V TTL compatibility, integrated hardware arbitration, and 2V data retention - making it irreplaceable in legacy industrial and military systems demanding deterministic dual-port behavior without voltage translation or external logic.

Availability

7025S45PFI is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and medical imaging equipment requiring stable component supply across extended product lifecycles.

Supply support for 7025S45PFI 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, and interface ICs, acquired by Renesas Electronics in 2019. Known for high-reliability, high-performance memory solutions.

The 7025S45PFI belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for real-time embedded systems requiring deterministic inter-processor communication, hardware-based resource arbitration, and robust operation across industrial and military temperature ranges.

FAQ

What is the maximum operating temperature range for the 7025S45PFI?

The 7025S45PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including 45 ns access time, BUSY arbitration timing, and 2V data retention. It does not support commercial (0°C to +70°C) or military (–55°C to +125°C) grades - the "I" suffix in the part number explicitly denotes industrial qualification.

Does the 7025S45PFI support true simultaneous read operations on both ports to the same memory location?

Yes, the 7025S45PFI supports true simultaneous reads to the same address on both ports without contention or delay. Its dual-port SRAM cell architecture allows concurrent access with no arbitration overhead. However, simultaneous write-to-same-address is blocked by the BUSY flag mechanism - the 7025S45PFI enforces exclusive write access via hardware arbitration to prevent data corruption.

How does the M/S pin affect BUSY signal behavior in the 7025S45PFI?

When M/S = HIGH, the 7025S45PFI operates as a master: BUSYL and BUSYR are push-pull outputs that assert during address contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs, allowing external BUSY signals from a master device to gate local write operations. This enables hierarchical arbitration in multi-device configurations without external logic.

Can the 7025S45PFI retain data at 2V, and what is the typical current draw in that mode?

Yes, the 7025S45PFI supports data retention at VCC = 2.0 V. In this mode, typical current draw is 100 µA, with a maximum of 4000 µA across the full industrial temperature range. This capability is exclusive to the "L" (low-power) variant - confirmed by the "S45PFI" suffix where "S" indicates speed grade (45 ns) and "I" confirms industrial temp, while the base family "7025S/L" designates dual variants; the 7025S45PFI uses the low-power core.

What package type is used for the 7025S45PFI, and are there pin-compatible alternatives in other packages?

The 7025S45PFI is supplied exclusively in a 100-pin Thin Quad Flatpack (TQFP, package code PNG100). While the broader 7025S/L family offers 84-pin PGA, Flatpack, and PLCC variants, those are not pin-compatible with the 100-pin TQFP due to differing pin counts, signal assignments, and power/ground distribution. No direct pin-compatible alternative exists - board layout must match the PNG100 footprint.