Renesas 7007S55PFI

Overview

IDT7007S55PFI from IDT (now Renesas) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 55 ns read cycle time, industrial temperature range (–40°C to +85°C), and TTL-compatible 5 V ±10% operation. It enables simultaneous asynchronous access to shared memory in real-time inter-processor communication systems such as DSP-FPGA co-processing modules.

For engineers reviewing the 7007S55PFI datasheet, 7007S55PFI pinout, 7007S55PFI application, or 7007S55PFI equivalent, this page delivers verified timing specs, validated master/slave arbitration behavior, confirmed semaphore flag implementation, and precise TQFP-80 package mapping - all directly traceable to the official IDT DSC 2940/16 datasheet (September 2019).

Technical Context

The 7007S55PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external arbitration logic. Its on-chip BUSY flag generation (M/S = H for master output, M/S = L for slave input) resolves port contention at the hardware level using address-match or CE-controlled arbitration.

It integrates full semaphore signaling (8 flags, addressed via A0–A2) and interrupt support (INTL/INTR triggered by writes to 7FFE_H/7FFF_H), both operating under dedicated CE/SEM control states. Power management uses per-port chip enable (CEL/CER) to switch between active (typ. 150 mA) and full standby (typ. 1.0 mA) modes.

Key Specifications

Pinout & Package

7007S55PFI is packaged in an 80-pin thin quad flatpack (TQFP, package code PNG80), measuring approximately 14 mm × 14 mm × 1.4 mm. All VCC pins require connection to 5 V supply; all GND pins must be tied to system ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and AS7C33256B-55JCIN, the 7007S55PFI uniquely delivers 5 V-native operation, integrated BUSY arbitration, and on-die semaphore/INT logic - making it irreplaceable in deterministic real-time inter-processor communication where timing predictability and feature integration are mandatory.

Availability

7007S55PFI is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data loggers, and multi-core test equipment requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial-temperature performance.

Supply support for 7007S55PFI 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.

The IDT7007 family was designed specifically for deterministic inter-processor communication in real-time embedded systems, emphasizing hardware arbitration, low-latency dual-port access, and robust industrial-grade reliability.

FAQ

What is the maximum operating temperature range for the 7007S55PFI?

The 7007S55PFI is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the Absolute Maximum Ratings table (DSC 2940/16, Table 5) and validated across all AC/DC electrical specifications. This range applies to the full 55 ns speed grade and supports deployment in motor drives, factory automation, and outdoor infrastructure equipment.

Does the 7007S55PFI support true simultaneous read operations on both ports?

Yes, the 7007S55PFI implements true dual-port memory cells that allow simultaneous reads from the same or different addresses on left and right ports without contention or delay. This capability is explicitly stated in the Features section and enabled by physically independent sense amplifiers and data paths per port - a core architectural trait of the IDT7007 series.

How is semaphore functionality implemented in the 7007S55PFI?

The 7007S55PFI provides eight hardware semaphore flags accessed via A0–A2 when CE = VIH and SEM = VIL (Truth Table II). Each flag is written using I/O0 and read across all I/O lines. This dedicated register bank operates independently of the main RAM array and requires no software initialization - a key differentiator from general-purpose SRAMs.

What package type is used for the 7007S55PFI, and what are its mechanical dimensions?

The 7007S55PFI uses an 80-pin thin quad flatpack (TQFP) package, designated PNG80. Its body measures approximately 14 mm × 14 mm × 1.4 mm, with lead pitch of 0.5 mm. Pin configuration matches Figure 2940 drw 03 in the datasheet, and all VCC/GND connections follow Notes 1–2 on that diagram.

Can the 7007S55PFI be used in a master/slave configuration, and how is it controlled?

Yes - the 7007S55PFI supports master/slave cascading via the M/S pin. When M/S = H, BUSYL/BUSYR function as push-pull outputs indicating local port contention; when M/S = L, they become inputs that inhibit writes on the slave port. This configuration enables seamless expansion to 16-bit+ data buses without external logic, as detailed in the Functional Block Diagram and Description sections.