Renesas 7005S55PFI

Overview

7005S55PFI from IDT is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns max read cycle time, TTL-compatible 5V ±10% supply, and integrated semaphore/arbitration logic for real-time inter-processor communication in embedded control systems.

For engineers reviewing the 7005S55PFI datasheet, 7005S55PFI pinout, 7005S55PFI application, or 7005S55PFI equivalent, this page delivers verified timing specs (tRC = 55 ns), power data (ISB1 = 13 mA), package mapping (64-pin TQFP), and dual-port arbitration behavior critical for deterministic multi-CPU memory sharing designs.

Technical Context

The 7005S55PFI implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-enabling simultaneous reads from identical memory locations without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and M/S-selectable master/slave configuration.

It supports two distinct access modes: RAM mode (CE = VIL, SEM = VIH) and semaphore mode (CE = VIH, SEM = VIL), with dedicated interrupt flag registers (INTL/INTR) and eight hardware semaphores addressed by A0–A2. All timing parameters-including tBDD (BUSY disable to valid data) and tSPS (semaphore contention window)-are specified for military-grade reliability across −55°C to +125°C.

Key Specifications

Pinout & Package

64-pin TQFP (PNG64) package with 4×16 pin grid, 0.5 mm pitch, and exposed thermal pad. Pin 1 marked by corner notch; top view orientation per IDT drawing 2738 drw 03.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IS61LV5128-55QL, the 7005S55PFI uniquely integrates hardware arbitration and semaphore logic in a 5V-native 64-pin footprint-eliminating external components required by alternatives while maintaining military temperature compliance and deterministic timing.

Availability

7005S55PFI is available at Aetrix Electronics and suitable for real-time industrial PLCs, avionics data bus bridges, secure military radio basebands, and high-reliability medical imaging controllers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7005S55PFI 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 high-performance timing, memory, and RF solutions, now part of Renesas Electronics.

The IDT7005 family was designed specifically for deterministic dual-processor communication in mission-critical military, aerospace, and industrial control systems-prioritizing hardware arbitration, wide temperature operation, and seamless 5V integration over density or cost.

FAQ

What is the maximum operating temperature range certified for the 7005S55PFI?

7005S55PFI is rated for −55°C to +125°C ambient operation and qualified to MIL-PRF-38535 QML Class V standards. This military-grade temperature range is explicitly confirmed in the datasheet's "Maximum Operating Temperature" table (page 4) and applies to all speed grades including the 55 ns variant. The device maintains full timing compliance and electrical specifications across this entire range without derating.

Does the 7005S55PFI support true simultaneous read operations from both ports to the same memory address?

Yes, the 7005S55PFI implements true dual-ported memory cells that allow concurrent reads from identical addresses on left and right ports without contention or timing penalty. This capability is explicitly stated in the "Features" section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and verified by the absence of BUSY assertion or timing penalties in the Read Cycle Waveform (Figure 2738 drw 07).

How does the M/S pin affect BUSY signal behavior in the 7005S55PFI?

When M/S = H, BUSYL and BUSYR function as push-pull outputs asserting busy status to external devices; when M/S = L, they become inputs monitoring busy signals from other devices in a cascaded master/slave configuration. This dual-mode behavior is documented in Note 1 of the Functional Block Diagram and Pin Names table (page 3), enabling flexible system-level arbitration without external logic.

What is the guaranteed data retention voltage for the 7005S55PFI during battery backup operation?

The 7005S55PFI guarantees data retention down to 2.0 V (VDR = 2.0 V min) when operating in battery backup mode, as specified in Table 2738 tbl 09. This parameter is tested and guaranteed across all temperature ranges for the "L" version; the "S" suffix in 7005S55PFI indicates standard power, but retention capability remains identical per IDT's family specification.

Can the 7005S55PFI be used in a 16-bit data path configuration, and if so, how is it implemented?

Yes, the 7005S55PFI supports 16-bit expansion via Master/Slave cascading using the M/S pin. Two devices are configured-one as master (M/S = H), one as slave (M/S = L)-with BUSY outputs/inputs cross-connected. This eliminates need for external arbitration logic and is explicitly described in the "Description" section (page 2) and "Features" list ("IDT7005 easily expands data bus width to 16 bits or more using the Master/Slave select").