Renesas 7027S15PF8

Overview

7027S15PF8 from IDT (now Renesas) is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous read/write access to the same address, 15 ns maximum access time (commercial grade), TTL-compatible 5V ±10% supply, and integrated hardware semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7027S15PF8 datasheet, 7027S15PF8 pinout, 7027S15PF8 application, or 7027S15PF8 equivalent, key selection considerations include bus-matching byte controls (UBL/LBL), master/slave cascading capability via M/S pin, BUSY/INT flag timing behavior, and industrial-grade thermal compatibility when configured as 7027S15PFI8.

Technical Context

The 7027S15PF8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses - each supporting concurrent reads or writes without external arbitration logic. Its on-chip port arbitration resolves contention via address-match or chip-enable timing, with BUSY assertion governed by tBAA/tBDA timing parameters.

Hardware semaphore signaling uses dedicated SEM pins and A0–A2 addressing to manage eight shared flags across ports; interrupt generation is triggered by writes to fixed mailbox addresses (7FFE_H/7FFF_H), with INTL/INTR outputs asserted as push-pull signals per Truth Table IV.

Key Specifications

Pinout & Package

7027S15PF8 is housed in a 100-pin TQFP package (IDT package code PF8) with 14 mm × 14 mm footprint and 1.4 mm height. Pin 1 index corner marked; all VCC and GND pins require local decoupling 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-15AC, the 7027S15PF8 delivers native 5V operation and simpler board integration; versus 70V27L15PF8, it trades 5 mW higher standby for 5 ns faster access - making it optimal for latency-bound, intermittently powered systems.

Availability

7027S15PF8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, real-time avionics data buffers, and DSP-FPGA co-processing interfaces requiring stable component supply, long-term obsolescence mitigation, and verified dual-port timing compliance.

Supply support for 7027S15PF8 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 semiconductor leader specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The IDT7027 family was designed specifically for real-time multiprocessing systems requiring deterministic, collision-free shared memory - targeting aerospace, factory automation, and test equipment where software arbitration introduces unacceptable jitter.

FAQ

What is the maximum operating temperature range for the 7027S15PF8?

The 7027S15PF8 is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial range (–40°C to +85°C); that specification applies only to variants designated with 'I' suffix (e.g., 7027S15PFI8). Thermal derating beyond +70°C is not supported per datasheet Section 5 Absolute Maximum Ratings.

Does the 7027S15PF8 support true simultaneous read/write to the same memory location?

Yes, the 7027S15PF8 implements true dual-ported memory cells that allow concurrent read and write operations to the exact same address - confirmed in the Functional Block Diagram and Features section stating "True Dual-Ported memory cells which allow simultaneous access of the same memory location." This is hardware-enforced and requires no software coordination.

How does the BUSY arbitration work when the 7027S15PF8 is configured as a Master (M/S = VIH)?

When M/S = VIH, BUSYL and BUSYR operate as push-pull outputs. If both ports attempt access to the same address, the port with earlier address/enable stabilization asserts BUSY on the opposing port to inhibit its write - governed by tAPS (5 ns min) and tBDD timing. This prevents data corruption without CPU involvement, as detailed in Timing Waveform 11 and Truth Table V.

Can the 7027S15PF8 be used in a 32-bit data path configuration?

Yes, the 7027S15PF8 supports 32-bit expansion via Master/Slave cascading: two devices are connected with M/S = VIH (Master) and M/S = VIL (Slave), sharing BUSY/INT lines and using CE0/CE1 to select depth. 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 voltage levels required for reliable semaphore flag access on the 7027S15PF8?

Semaphore access requires CE = VIH and SEM = VIL per Truth Table III and Section 4 Notes. Input voltage thresholds are VIH ≥ 2.2 V and VIL ≤ 0.8 V (DC Electrical Characteristics Table 7), with 5.0 V ±10% supply. Attempting semaphore access with CE = VIL or SEM = VIH will instead access the main RAM array - misconfiguration causes functional failure, not damage.