Renesas 7027S35G

Overview

7027S35G from IDT is a high-speed 32K × 16 dual-port static RAM with true simultaneous access to the same memory location, 35 ns maximum access time (commercial grade), 5 V ±10% single-supply operation, and integrated hardware semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7027S35G datasheet, 7027S35G pinout, 7027S35G application, or 7027S35G equivalent, this page delivers verified timing specs, validated TQFP-100 package mapping, confirmed dual-port arbitration behavior, and two field-proven alternative parts for bus-width expansion or power optimization in multi-CPU architectures.

Technical Context

The 7027S35G implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - enabling concurrent read/write operations without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag assertion based on address match or chip-enable timing, with configurable Master/Slave mode via M/S pin.

It integrates full hardware semaphore signaling across eight flags (addressed by A0–A2), supports byte-selectable writes (UBL/LBL), and provides four standby current modes (ISB1–ISB4) controlled by TTL/CMOS-level CE inputs - all operating within industrial temperature range (–40°C to +85°C) at 5 V supply.

Key Specifications

Pinout & Package

7027S35G is packaged in a 100-pin TQFP (IDT package code PNG100), with 48 I/O pins (I/O0L–I/O15L and I/O0R–I/O15R), 32 address pins (A0L–A14L and A0R–A14R), dual chip enables per port (CE0L/CE1L, CE0R/CE1R), and dedicated semaphore/interrupt/BUSY control signals. 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-35AXC and IDT70V27L25PFI, the 7027S35G uniquely retains native 5 V operation, M/S cascading, and full BUSY/semaphore feature set - making it irreplaceable in legacy industrial and aerospace platforms requiring drop-in compatibility and deterministic arbitration.

Availability

7027S35G is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and telecom line cards requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 7027S35G 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 interface, and RF solutions for communications, computing, and industrial markets.

The IDT7027 family was designed specifically for deterministic inter-processor communication in real-time embedded systems - delivering hardware-accelerated arbitration, semaphore, and interrupt signaling to replace software-based synchronization overhead.

FAQ

What is the maximum access time specification for the 7027S35G?

The 7027S35G has a maximum access time (tAA) of 35 ns under commercial temperature conditions (0°C to +70°C) and 5 V ±10% supply. This value is guaranteed across voltage and temperature extremes per AC Electrical Characteristics Table 12 in the official datasheet. The 7027S35G achieves this performance using high-speed CMOS process technology while maintaining full dual-port functionality.

Does the 7027S35G support both Master and Slave configurations?

Yes, the 7027S35G supports configurable Master/Slave operation via the M/S pin: when M/S = VIH, BUSYL and BUSYR function as push-pull outputs indicating port contention; when M/S = VIL, they become inputs that inhibit writes on the slave port. This enables flexible cascading in 32-bit+ memory systems without external logic - a key feature confirmed in the Functional Block Diagram and Truth Table I.

How does the 7027S35G implement hardware semaphore functionality?

The 7027S35G implements eight hardware semaphore flags accessed via A0–A2 address lines and controlled by SEM pins (SEML/SEMR). Writing to I/O0 sets the flag; reading returns the value across all 16 I/O lines. This atomic operation - detailed in Truth Table III and Functional Description - eliminates race conditions in multi-CPU systems, unlike software-only semaphores that require disabling interrupts or complex polling loops.

What are the power consumption characteristics of the 7027S35G in standby mode?

In full standby (ISB3 mode), where both ports are deselected with CMOS-level inputs (CE > VCC − 0.2 V), the 7027S35G draws only 0.2 mA typical - significantly lower than its 750 mW active power (150 mA at 5 V). This low-quiescent-current state is enabled by internal power-gating circuitry controlled by CE0/CE1, allowing selective port shutdown in battery-sensitive or thermally constrained applications.

Is the 7027S35G pin-compatible with other members of the IDT7027 family?

Yes, the 7027S35G shares identical pinout and package (100-pin TQFP) with all speed grades (e.g., 7027S15G, 7027S25G) and variants (7027L series) in the IDT7027 family. This allows direct replacement for performance tuning or thermal optimization without PCB modification - confirmed by Pin Configurations diagrams and Package Code PNG100 references across datasheet pages 2–3.