Renesas 7007S55PF8

Overview

7007S55PF8 from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 55 ns read cycle time, TTL-compatible 5 V ±10% operation, and integrated hardware semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7007S55PF8 datasheet, 7007S55PF8 pinout, 7007S55PF8 application, or 7007S55PF8 equivalent, this page delivers verified timing specs, master/slave arbitration behavior, BUSY/INT signal timing, semiconductor-grade standby current values, and confirmed TQFP-80 package compatibility - all validated against IDT's official DSC 2940/16 datasheet (September 2019).

Technical Context

The 7007S55PF8 implements fully asynchronous dual-port access with separate address, control, and I/O buses per port, enabling simultaneous reads of the same memory location. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output), with M/S pin selecting master (BUSY output) or slave (BUSY input) mode.

It supports two distinct memory access modes: RAM array access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), using A0–A2 to select among eight semaphore flags. Interrupts are triggered by writes to dedicated mailbox addresses (7FFE_H and 7FFF_H) and cleared via reads to those same locations.

Key Specifications

Pinout & Package

7007S55PF8 is housed in an 80-pin thin quad flatpack (TQFP) package (IDT package code PNG80), with 4×20 pin grid, exposed thermal pad (not electrically connected), and 0.5 mm pitch. All V_CC and GND pins must be decoupled locally per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-55AXC and IDT70V27L25PFGI, the 7007S55PF8 offers native 5 V TTL compatibility, identical 80-pin TQFP footprint, and proven industrial-temperature reliability - making it the optimal choice for cost-sensitive, legacy 5 V embedded designs requiring deterministic dual-port behavior without voltage translation or layout changes.

Availability

7007S55PF8 is available at Aetrix Electronics and suitable for industrial PLC communication, real-time motor control, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 7007S55PF8 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, acquired by Renesas Electronics in 2019.

The IDT7007 family was engineered for deterministic inter-processor communication in hard real-time systems, emphasizing hardware arbitration, mailbox-style interrupts, and seamless master/slave scalability - directly addressing needs in industrial automation, aerospace, and medical equipment.

FAQ

What is the maximum operating temperature range for the 7007S55PF8?

The 7007S55PF8 is rated for industrial temperature operation from –40°C to +85°C, as confirmed in the "Recommended DC Operating Conditions" table (DSC 2940/16, Table 5). This specification applies to all speed grades including the 55 ns variant, and is validated across the full 5.0 V ±10% supply range.

Does the 7007S55PF8 support true simultaneous read operations from both ports to the same memory address?

Yes, the 7007S55PF8 implements true dual-ported memory cells that allow concurrent reads from both left and right ports to the identical address location without contention or BUSY assertion. This capability is explicitly stated in the "Features" section and verified in Truth Table I of the DSC 2940/16 datasheet.

How does the M/S pin affect BUSY signal behavior on the 7007S55PF8?

When M/S = HIGH, the 7007S55PF8 operates as a master: BUSYL and BUSYR are push-pull outputs used for arbitration. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes upon assertion. This dual-role behavior is defined in Note 1 of the Pin Configurations section and Figure 1 of the datasheet.

What are the valid interrupt mailbox addresses for the 7007S55PF8, and how are they triggered?

The 7007S55PF8 uses fixed addresses 7FFE_H (to set INTL) and 7FFF_H (to set INTR) as interrupt mailboxes. INTL asserts when the right port writes to 7FFE_H; INTR asserts when the left port writes to 7FFF_H. Clearing requires a read from the same address, as detailed in Truth Table III and the Functional Description section.

Is the 7007S55PF8 pin-compatible with other members of the IDT7007 family, such as the 7007S25PF8?

Yes, all IDT7007 variants-including 7007S55PF8, 7007S25PF8, and 7007S35PF8-share identical 80-pin TQFP (PNG80) packaging and pinout. The sole difference is AC timing performance (t_RC, t_AA, etc.), meaning PCB layout and firmware interface remain unchanged across speed grades.