Renesas 7025S55PFI

Overview

7025S55PFI from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 55 ns maximum read cycle time, 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 control systems.

For engineers reviewing the 7025S55PFI datasheet, 7025S55PFI pinout, 7025S55PFI application, or 7025S55PFI equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing under address contention, semaphore flag update pulse width, low-power standby current (16 mA typ. for both ports), and 84-pin PLCC package compatibility with legacy military/industrial PCB layouts.

Technical Context

The 7025S55PFI implements full hardware port arbitration with on-chip semaphore logic and BUSY flag generation triggered by address match or chip enable assertion. Its dual-port architecture allows concurrent read/write operations across independent address/data/control buses without external logic.

It supports two distinct operational modes: as a stand-alone 128 Kbit dual-port RAM or as a MASTER/SLAVE pair-where M/S = H configures BUSY as output (master), and M/S = L configures BUSY as input (slave)-enabling deterministic contention resolution in multi-processor shared-memory systems.

Key Specifications

Pinout & Package

7025S55PFI is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with J-lead configuration, body size ≈ 1.12 in × 1.12 in × 0.16 in. Pin 1 is marked by a notch or dot; orientation follows standard PLCC top-view convention.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IDT70V25S55PF, the 7025S55PFI uniquely retains full 5 V TTL compatibility, industrial temperature rating, and battery-backed data retention-making it irreplaceable in legacy-reliant, mission-critical 5 V systems where PCB layout and power architecture cannot be modified.

Availability

7025S55PFI is available at Aetrix Electronics and suitable for industrial motion control, avionics subsystems, and telecom line card applications requiring stable component supply across extended product lifecycles.

Supply support for 7025S55PFI 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 IDT7025 family was engineered for deterministic real-time shared-memory architectures in military, industrial, and telecom infrastructure-prioritizing hardware arbitration, low-latency dual-port access, and ruggedized packaging.

FAQ

What is the operating temperature range specified for the 7025S55PFI?

The 7025S55PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is explicitly confirmed in the "Recommended DC Operating Conditions" table (Table 5) and applies to all speed grades within the 7025S/L series, including the 55 ns variant. The device meets this range under 5.0 V ±10% supply conditions.

Does the 7025S55PFI support battery backup for data retention?

Yes, the 7025S55PFI supports data retention at 2 V, consistent with the IDT7025L low-power variant's documented capability. Although the "S" suffix denotes standard power (vs. "L" for low-power), the family shares the same CMOS process and retention architecture; Table 10 confirms VDR = 2.0 V and tCDR = 0 ns for data retention mode activation.

How does the BUSY arbitration mechanism function in the 7025S55PFI when configured as a master?

When M/S = H (master configuration), the 7025S55PFI asserts BUSYR as an output upon detecting address contention or pending write completion on the opposite port. Timing parameters tBAA (≤20 ns), tBDA (≤20 ns), and tBDD (≤30 ns) define its response-ensuring the reading port receives valid data only after BUSY deassertion, preventing read-before-write hazards.

Can the 7025S55PFI be used in a 32-bit data bus configuration?

Yes, the 7025S55PFI supports 32-bit expansion via master/slave cascading. Two devices are connected with M/S = H on the master and M/S = L on the slave; the master's BUSYR drives the slave's BUSYL, enabling coordinated arbitration. This configuration requires no external logic and maintains full-speed operation as stated in the device description.

What is the maximum allowable standby current for the 7025S55PFI under industrial temperature conditions?

Under industrial temperature (–40°C to +85°C) and TTL-level inputs, the 7025S55PFI exhibits a maximum standby current (ISB1) of 20 mA when both ports are disabled-per Table 9a. At typical conditions (25°C), it draws 16 mA, making it suitable for low-duty-cycle monitoring applications where power budget is constrained.