Renesas 7027S25PF

Overview

7027S25PF from IDT (Integrated Device Technology) is a high-speed 32K × 16 dual-port static RAM with true simultaneous access to the same memory location from independent left and right ports, 25 ns maximum access time, TTL-compatible 5 V ±10% supply, and integrated hardware semaphore/arbiration logic - deployed in real-time industrial control systems requiring deterministic inter-processor communication.

For engineers reviewing the 7027S25PF datasheet, 7027S25PF pinout, 7027S25PF application, or 7027S25PF equivalent, this page delivers verified timing specs, master/slave BUSY arbitration behavior, dual-byte control for bus-matching, on-chip semaphore addressing (A0–A2), and TQFP-100 package layout - all confirmed from IDT's official DSC 3199/12 datasheet (June 2019).

Technical Context

The 7027S25PF implements fully asynchronous dual-port architecture with separate address, data, and control buses per port (A0L–A14L/I/O0L–I/O15L vs. A0R–A14R/I/O0R–I/O15R), enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration resolves contention via BUSY flag assertion based on address match or chip-enable timing, with tBDD ≤25 ns propagation delay for port-to-port write-read synchronization.

It supports MASTER/SLAVE cascading for 32-bit+ word systems using M/S pin configuration: when M/S = VIH, BUSY is an output flagging write contention; when M/S = VIL, BUSY becomes an input that inhibits writes on the slave port. Semaphore flags (8 total) are accessed via CE = VIH/SEM = VIL with A0–A2 addressing and I/O0 write/data broadcast across all 16 I/O lines.

Key Specifications

Pinout & Package

7027S25PF is housed in a 100-pin TQFP package (IDT package code PNG100) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins must be externally decoupled; NC pins are no-connect and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and R1EX24032AS0A, the 7027S25PF uniquely integrates master/slave cascading, hardware semaphore addressing, and push-pull BUSY arbitration - delivering plug-and-play dual-CPU interoperability in legacy 5 V industrial systems without external glue logic.

Availability

7027S25PF is available at Aetrix Electronics and suitable for industrial PLCs, real-time motor controllers, DSP co-processing subsystems, and avionics data acquisition modules requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7027S25PF 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, acquired by Renesas Electronics in 2019.

The 7027S25PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time industrial and aerospace systems where hardware-enforced memory coherency is mandatory.

FAQ

What is the maximum operating temperature range for the 7027S25PF?

The 7027S25PF is rated for industrial temperature operation from –40°C to +85°C, as confirmed in IDT's DSC 3199/12 datasheet Section 2 (Description) and Table 6 (Recommended DC Operating Conditions). This qualifies it for deployment in harsh environments such as factory automation cabinets and outdoor motor drive enclosures without derating.

Does the 7027S25PF support true simultaneous read/write to the same memory address?

Yes, the 7027S25PF implements true dual-ported memory cells that permit simultaneous access to the same memory location from left and right ports - a core feature explicitly stated in the "Features" section of the datasheet. When contention occurs, hardware arbitration asserts BUSY to stall the later-arriving write, preserving data integrity without software intervention.

How does the M/S pin affect BUSY functionality on the 7027S25PF?

When M/S = VIH, the 7027S25PF operates as a Master: BUSYL and BUSYR are push-pull outputs that assert LOW during address/contention conflicts. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that inhibit writes when driven LOW by a Master - enabling hierarchical multi-device memory expansion as described in Section 1 (Functional Block Diagram).

What are the valid semaphore addressing pins and how many flags does the 7027S25PF provide?

The 7027S25PF provides eight hardware semaphore flags addressed exclusively by A0–A2 (3 address bits), as documented in Truth Table III and Section 16 (Functional Description). Semaphore access requires CE = VIH and SEM = VIL - distinct from normal RAM access - and all 16 I/O lines reflect the flag value upon read, enabling broadcast-style synchronization.

Is the 7027S25PF pin-compatible with other speed grades in the IDT7027S family?

Yes, all IDT7027S variants - including 7027S15PF, 7027S20PF, 7027S25PF, 7027S35PF, and 7027S55PF - share identical 100-pin TQFP packaging and pinout, as confirmed in Pin Configurations (Pages 2–3) of DSC 3199/12. Only AC timing parameters differ; no PCB redesign is required when upgrading or downgrading speed grade.