Renesas 7027S35PF8

Overview

7027S35PF8 from IDT 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, 35 ns maximum access time (commercial grade), TTL-compatible 5 V ±10% supply, and on-chip semaphore/arbiter logic for inter-port synchronization - used in real-time embedded systems requiring deterministic shared-memory communication between two processors or bus masters.

For engineers reviewing the 7027S35PF8 datasheet, 7027S35PF8 pinout, 7027S35PF8 application, or 7027S35PF8 equivalent, key selection considerations include its 35 ns read/write timing, dual chip-enable architecture for depth expansion, Master/Slave BUSY arbitration, separate upper/lower byte enables, and TQFP-100 packaging with industrial-grade thermal range support.

Technical Context

The 7027S35PF8 implements fully asynchronous dual-port operation with independent address, control, and I/O buses per port, enabling concurrent read/write access without external arbitration logic. Its on-chip hardware supports semaphore flag management (8 flags, addressed via A0–A2), interrupt signaling (INTL/INTR at fixed addresses 7FFEh/7FFFh), and automatic power-down via CE0/CE1 control.

Port arbitration uses both address-match and chip-enable timing modes: when M/S = VIH (Master), BUSY outputs assert on contention; when M/S = VIL (Slave), BUSY inputs block writes. The device supports 32-bit+ data bus expansion using Master/Slave cascading with dedicated M/S pin and BUSY flag routing.

Key Specifications

Pinout & Package

7027S35PF8 is housed in a 100-pin TQFP (PNG100) package with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC, 7027S35PF8 delivers native 5 V operation and integrated BUSY arbitration, reducing BOM count; compared with IDT70V27L15PF, it trades 20 ns slower access for lower power and commercial-grade cost optimization - ideal for cost-sensitive, non-extreme-temperature dual-CPU designs.

Availability

7027S35PF8 is available at Aetrix Electronics and suitable for real-time dual-processor communication, industrial PLC memory coherency, and telecom line card buffering requiring stable component supply across production lifecycles.

Supply support for 7027S35PF8 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, and RF solutions, now part of Renesas Electronics since 2019.

The IDT7027 family was designed specifically for deterministic, low-latency shared-memory architectures in dual-processor and bus-mastering systems - emphasizing hardware arbitration, semaphore support, and seamless expandability without external logic.

FAQ

What is the maximum operating frequency supported by the 7027S35PF8?

The 7027S35PF8 does not operate at a clock frequency - it is an asynchronous static RAM. Its performance is defined by access timing parameters: tAA (address access) and tRC (read cycle) are both rated at 35 ns maximum. This enables reliable operation in systems where control signals (CE, R/W, OE) meet these timing windows, supporting effective data rates up to ~28.6 MHz in burst-read scenarios.

Does the 7027S35PF8 support 3.3 V operation?

No, the 7027S35PF8 requires a nominal 5.0 V supply with ±10% tolerance (4.5 V to 5.5 V). It is TTL-compatible and not 3.3 V–rated. For 3.3 V systems, designers must use level-shifting circuitry or select alternatives like the CY7C028V-35AXC, which features 3.3 V core operation with 5 V tolerant I/O.

How does the Master/Slave configuration work on the 7027S35PF8?

Configuring the 7027S35PF8 as Master (M/S = VIH) enables BUSYL and BUSYR as push-pull outputs that assert during address contention. As Slave (M/S = VIL), those pins become inputs that inhibit writes when driven low by a Master device. This allows cascaded dual-port systems to coordinate access without external logic - the BUSY signal propagates automatically between linked devices.

Can the 7027S35PF8 be used without enabling the semaphore or interrupt functions?

Yes. The semaphore (SEML/SEMR) and interrupt (INTL/INTR) functions are optional. When unused, A0–A2 remain standard address lines, and locations 7FFEh/7FFFh function as regular SRAM - no configuration or disable sequence is required. The device operates as a basic dual-port RAM with full timing compliance and arbitration disabled.

What is the purpose of the CE0 and CE1 pins on each port of the 7027S35PF8?

CE0 and CE1 per port provide hierarchical chip enable control: CE0L/CE0R enable primary access, while CE1L/CE1R support depth expansion. When CE0 is deasserted and CE1 asserted, the port enters low-power standby (ISB2 mode). This dual-enable scheme allows stacking multiple 7027S35PF8 devices to build wider memory arrays (e.g., 32K × 32) without external address decoders or gating logic.