Renesas 7027L35PF

Overview

7027L35PF from IDT is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 35 ns maximum access time (commercial grade), 1 mW typical standby power, and full on-chip semaphore and arbitration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7027L35PF datasheet, 7027L35PF pinout, 7027L35PF application, or 7027L35PF equivalent, key selection considerations include its 100-pin TQFP package, master/slave cascading capability for 32-bit+ bus expansion, BUSY/INT flag timing compliance, and industrial-grade voltage tolerance (4.5–5.5 V) despite being commercial-temp rated.

Technical Context

The 7027L35PF 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 timing, asserting BUSY flags to inhibit conflicting writes without external logic.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 addressing of eight shared flags, with tSPS = 5 ns contention window and tSWRD = 5 ns write-to-read latency-enabling deterministic inter-processor synchronization in tightly coupled multi-CPU architectures.

Key Specifications

Pinout & Package

7027L35PF is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm lead pitch and 14 mm × 14 mm body size. All VCC and GND pins must be externally 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-35AXC and IDT70V27L35PF, the 7027L35PF delivers native 5 V operation and hardware M/S cascade capability ideal for legacy industrial control upgrades, while IDT70V27L35PF extends reliability to industrial temperatures without altering timing or logic behavior.

Availability

7027L35PF is available at Aetrix Electronics and suitable for industrial PLC controllers, telecom line cards, avionics display systems, and test & measurement equipment requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.

Supply support for 7027L35PF 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 interface solutions for communications, computing, and industrial markets.

The 7027L35PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems with strict timing predictability requirements.

FAQ

What is the operating temperature range for the 7027L35PF?

The 7027L35PF is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial temperature ranges; for -40°C to +85°C operation, the pin-compatible IDT70V27L35PF is the designated alternative. Thermal derating is not supported, and operation outside this range may result in timing violations or data retention failure.

Does the 7027L35PF support true simultaneous read/write to the same memory location?

Yes, the 7027L35PF features true dual-ported memory cells that allow independent, asynchronous read and write operations to the exact same address by left and right ports. The on-chip arbitration logic uses BUSY flag assertion to prevent data corruption-ensuring deterministic behavior without external intervention. This capability is confirmed in the functional block diagram and Truth Table V.

How does the 7027L35PF implement semaphore signaling between ports?

The 7027L35PF provides eight hardware semaphore flags addressed by A0–A2 and accessed via I/O0 (write) and all I/O lines (read) when CE = VIH and SEM = VIL. Each flag has a 5 ns contention window (tSPS) and 5 ns write-to-read latency (tSWRD), enabling atomic, cycle-deterministic mutual exclusion. This is implemented entirely in hardware-no firmware overhead is required for flag management.

Can the 7027L35PF be used in a 32-bit data bus configuration?

Yes, the 7027L35PF supports 32-bit bus expansion using its Master/Slave (M/S) configuration. When cascaded, one device operates as master (M/S = VIH, BUSY output) and another as slave (M/S = VIL, BUSY input), enabling full-speed, error-free 32-bit operation without external logic. This is explicitly documented in the "IDT MASTER/SLAVE Dual-Port RAM approach" section of the datasheet.

What is the standby power consumption of the 7027L35PF?

The 7027L35PF consumes 0.2 mA typical (1 µA max) in full standby mode (ISB3) when both ports are disabled with CMOS-level inputs (CE > VCC − 0.2 V). In TTL-level standby (ISB1), it draws 30 mA typical. This ultra-low ISB3 current enables energy-efficient sleep modes in portable or thermally constrained applications while retaining full SRAM data retention.