Renesas 7027L55PF8/2909

Overview

IDT7027L55PF8/2909 from IDT (now Renesas) 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, 55 ns maximum access time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables real-time inter-processor communication in embedded control systems requiring deterministic arbitration and semaphore-based resource sharing.

For engineers reviewing the IDT7027L55PF8/2909 datasheet, IDT7027L55PF8/2909 pinout, IDT7027L55PF8/2909 application, or IDT7027L55PF8/2909 equivalent, key selection criteria include its 55 ns read cycle time, 1 mW standby power, on-chip BUSY/INT flag logic, Master/Slave cascading capability for 32-bit+ bus expansion, and support for hardware semaphore signaling across ports.

Technical Context

The IDT7027L55PF8/2909 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration resolves contention via address-match or chip-enable timing, generating BUSY flags to stall conflicting writes.

It integrates full hardware semaphore support using eight dedicated flags addressed by A0–A2, writable via I/O0 and readable across all 16 I/O lines. The M/S pin configures the device as Master (BUSY output) or Slave (BUSY input), enabling depth expansion with no external logic.

Key Specifications

Pinout & Package

Package: 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with IDT7027L55PF8/2909, CY7C028V-55AXC requires voltage translation and external arbitration, increasing BOM cost and board area, while Renesas 70V27L55PF8 offers identical functionality with enhanced supply chain assurance.

Availability

IDT7027L55PF8/2909 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial motion control, and avionics data concentrators requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.

Supply support for IDT7027L55PF8/2909 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

Renesas Electronics Corporation is a global semiconductor leader delivering trusted microcontrollers, analog, power, and connectivity solutions for automotive, industrial, infrastructure, and IoT applications.

IDT7027L55PF8/2909 belongs to the IDT7027 family of high-speed dual-port SRAMs designed specifically for deterministic, low-latency inter-processor communication in safety-critical and real-time embedded systems.

FAQ

What is the maximum operating temperature range for the IDT7027L55PF8/2909?

The IDT7027L55PF8/2909 is rated for industrial temperature operation from –40°C to +85°C. This specification is verified per the DC and AC electrical characteristics tables in the official datasheet, with all timing parameters guaranteed across this full range. The device uses CMOS high-performance technology optimized for thermal stability in demanding environments such as motor drives and factory automation equipment. IDT7027L55PF8/2909 maintains 55 ns access time and 1 mW standby power throughout this range.

Does the IDT7027L55PF8/2909 support true simultaneous read/write to the same memory location?

Yes, the IDT7027L55PF8/2909 features true dual-ported memory cells that allow independent, asynchronous access-including simultaneous read and write-to the exact same memory address from left and right ports. This capability is implemented at the silicon level and does not require external arbitration. When contention occurs, on-chip logic asserts BUSY on the requesting port to prevent data corruption. IDT7027L55PF8/2909 delivers this functionality without any additional discrete components.

How does the Master/Slave (M/S) pin function in the IDT7027L55PF8/2909?

The M/S pin configures the IDT7027L55PF8/2909 as either Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL and BUSYR are push-pull outputs used to signal contention to downstream devices. In Slave mode, they become inputs that inhibit writes when asserted low. This enables seamless depth expansion: one Master coordinates multiple Slaves via BUSY chaining, eliminating external logic. IDT7027L55PF8/2909 supports cascading for 32-bit or wider memory systems using this native architecture.

What is the purpose of the semaphore function in the IDT7027L55PF8/2909?

The IDT7027L55PF8/2909 integrates eight hardware semaphore flags accessed via A0–A2 and controlled by SEM pins. These flags are written using I/O0 and read across all 16 I/O lines, enabling atomic resource locking between ports without software overhead. Each flag operates independently, allowing fine-grained synchronization of shared peripherals or memory regions. IDT7027L55PF8/2909 implements this entirely in hardware-no firmware intervention or polling is required to acquire or release semaphores.

Can the IDT7027L55PF8/2909 operate with a 3.3 V supply?

No, the IDT7027L55PF8/2909 requires a single 5.0 V ±10% supply (4.5 V to 5.5 V) and is TTL-compatible. Its input thresholds (VIH = 2.2 V min, VIL = 0.8 V max) and output drive levels (VOH = 2.4 V min at –4 mA, VOL = 0.4 V max at 4 mA) are specified exclusively for 5 V operation. Attempting to power IDT7027L55PF8/2909 from 3.3 V will result in undefined behavior, failed logic transitions, and potential damage due to improper biasing of internal circuits.