Renesas 7007S20PFI8

Overview

7007S20PFI8 from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with independent left/right asynchronous ports, 20 ns maximum access time (industrial grade), 5 V ±10% single supply, and on-chip semaphore/interrupt arbitration logic - used in real-time inter-processor communication systems such as industrial PLCs and telecom line cards.

For engineers reviewing the 7007S20PFI8 datasheet, 7007S20PFI8 pinout, 7007S20PFI8 application, or 7007S20PFI8 equivalent, key selection criteria include BUSY-flag arbitration timing (tBDD ≤ 30 ns), dual-port read/write contention handling, master/slave cascading capability via M/S pin, and industrial temperature support (–40°C to +85°C).

Technical Context

The 7007S20PFI8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves simultaneous access conflicts using either chip-enable (CE)-driven or address-match-driven BUSY assertion, with configurable master/slave mode via the M/S pin.

It supports two distinct memory access modes: standard RAM access (CE = LOW, SEM = HIGH) and semaphore register access (CE = HIGH, SEM = LOW), enabling eight hardware semaphores addressed by A0–A2. Interrupt flags (INTL/INTR) are triggered by writes to dedicated mailbox addresses (7FFE_H/7FFF_H).

Key Specifications

Pinout & Package

80-pin thin quad flatpack (TQFP), RoHS-compliant, body size 14 mm × 14 mm × 1.4 mm. Pin 1 marked via corner notch; all VCC pins require local decoupling; all GND pins must be connected to solid ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC and R1EX24032AS0C-20#U0, the 7007S20PFI8 uniquely integrates hardware semaphore registers, master/slave arbitration, and industrial temperature support in an 80-pin TQFP - making it the sole option for deterministic, low-latency inter-processor communication in harsh environments.

Availability

7007S20PFI8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card inter-processor messaging, and avionics sensor fusion hubs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 7007S20PFI8 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 interface, RF, and high-performance silicon solutions before its acquisition by Renesas in 2019.

The IDT7007 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, industrial reliability, and seamless 5 V system integration.

FAQ

What is the operating temperature range of the 7007S20PFI8?

The 7007S20PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is production-tested and guaranteed across all DC and AC parameters, including access time (tAA ≤ 20 ns), standby current (ISB3 ≤ 0.2 mA), and BUSY arbitration timing (tBDD ≤ 30 ns), making it suitable for factory automation and outdoor telecom equipment where ambient conditions vary widely.

How does the M/S pin affect BUSY flag behavior in the 7007S20PFI8?

In the 7007S20PFI8, the M/S pin configures BUSY functionality: when M/S = HIGH, BUSYL and BUSYR become push-pull outputs that assert during address contention; when M/S = LOW, they become inputs that accept BUSY signals from a master device. This enables hierarchical arbitration in multi-RAM systems - for example, one 7007S20PFI8 as master coordinating multiple slave devices without external logic.

Can the 7007S20PFI8 perform simultaneous reads from both ports to the same memory address?

Yes, the 7007S20PFI8 supports true simultaneous reads to the same memory location from both ports with no timing penalty or conflict. Its dual-port SRAM cell architecture guarantees coherent, glitch-free data delivery on both I/O buses - a core feature confirmed in the functional description and truth tables, essential for mirrored status register access in redundant control systems.

What are the dedicated interrupt mailbox addresses for the 7007S20PFI8?

The 7007S20PFI8 uses fixed interrupt mailbox addresses: writing to address 7FFF_H on the left port asserts the right-port interrupt flag (INTR), and writing to 7FFE_H on the right port asserts the left-port flag (INTL). Clearing is symmetric - reading 7FFF_H clears INTR, and reading 7FFE_H clears INTL. These locations reside within the main 32K × 8 array and retain user-defined data.

Does the 7007S20PFI8 support hardware semaphore operations, and how are they accessed?

Yes, the 7007S20PFI8 includes eight hardware semaphore registers accessed separately from main memory. To use them, set SEM = LOW and CE = HIGH, then address semaphores using A0–A2 (eight combinations). I/O0 writes the flag value; all I/O lines (I/O0–I/O7) read it. This dedicated path prevents interference with RAM operations and enables atomic test-and-set behavior critical for RTOS resource locking.