Renesas 7027S20PFI

Overview

7027S20PFI from IDT (now Renesas) is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 20 ns maximum access time (industrial grade), TTL-compatible 5V ±10% supply, and on-chip semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7027S20PFI datasheet, 7027S20PFI pinout, 7027S20PFI application, or 7027S20PFI equivalent, this page delivers verified specifications, industrial-temperature package mapping (100-pin TQFP), dual-port arbitration behavior, BUSY/INT flag timing, and validated alternatives for multiprocessing memory subsystems.

Technical Context

The 7027S20PFI implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves port contention via address-match or chip-enable-triggered BUSY assertion, with programmable Master/Slave configuration using the M/S pin.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 addressing of eight shared flags, and provides separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for flexible bus-width matching in 32-bit+ systems.

Key Specifications

Pinout & Package

7027S20PFI is packaged in a 100-pin TQFP (Thin Quad Flatpack) with 0.5 mm pitch, 14 mm × 14 mm body, and exposed thermal pad. All VCC and GND pins must be properly decoupled per layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AC, 7027S20PFI offers hardware semaphore and M/S scalability; compared with 70V27L20PF, it trades slightly higher standby power for broader legacy compatibility and identical industrial qualification.

Availability

7027S20PFI is available at Aetrix Electronics and suitable for real-time multiprocessor systems, avionics data concentrators, industrial PLC backplanes, and ruggedized communications gateways requiring stable component supply across extended product lifecycles.

Supply support for 7027S20PFI 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, designs high-performance timing, memory, and interface solutions for industrial, communications, and computing markets.

The 7027S20PFI belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in safety-critical and latency-sensitive embedded systems.

FAQ

What is the operating temperature range for the 7027S20PFI?

The 7027S20PFI is rated for industrial operation from −40°C to +85°C. This specification is guaranteed across all AC and DC parameters including 20 ns access time, BUSY arbitration timing, and full standby current (ISB3 ≤ 0.2 mA), making it suitable for deployment in uncontrolled environments such as factory floors or vehicle engine compartments.

Does the 7027S20PFI support true simultaneous read/write to the same memory location?

Yes, the 7027S20PFI features true dual-ported memory cells that permit concurrent read and write operations to identical addresses without corruption. Its on-chip arbitration logic uses either address-match detection or chip-enable sequencing to assert BUSY and prevent conflicting writes - a core capability confirmed in the functional block diagram and Truth Table V.

How does the M/S pin affect BUSY signal behavior in the 7027S20PFI?

When M/S = VIH, the 7027S20PFI operates as a Master: BUSYL and BUSYR become push-pull outputs that actively drive low to inhibit writes on the opposing port during contention. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that must be driven externally (e.g., by another Master) to gate write operations - enabling hierarchical multi-RAM configurations.

Can the 7027S20PFI be used in a 32-bit data path system?

Yes, the 7027S20PFI supports 32-bit expansion via its Master/Slave cascade capability. Two devices can be configured - one as Master (M/S = VIH), one as Slave (M/S = VIL) - with BUSY chaining to maintain atomicity. The datasheet explicitly states "IDT7027 easily expands data bus width to 32 bits or more using the Master/Slave select when cascading more than one device."

What are the valid mailbox addresses for interrupt generation in the 7027S20PFI?

The 7027S20PFI uses fixed mailbox addresses for interrupt triggering: writing to address 7FFFh (hex) on the right port asserts INTR; writing to 7FFEh on the left port asserts INTL. These locations are user-accessible SRAM cells - the written 16-bit value becomes the message payload, and clearing occurs via read (right port) or enabled read (left port), as defined in Truth Table IV.