Renesas 7027L20PF

Overview

7027L20PF from IDT (Integrated Device Technology) 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, 20 ns maximum access time (industrial grade), 1 mW typical standby power, and full on-chip semaphore and BUSY arbitration logic - deployed in real-time embedded systems requiring deterministic inter-processor communication, such as industrial PLCs and avionics data concentrators.

For engineers reviewing the 7027L20PF datasheet, 7027L20PF pinout, 7027L20PF application, or 7027L20PF equivalent, key selection considerations include its 100-pin TQFP package, master/slave cascading capability for 32-bit+ bus expansion, TTL-compatible 5V ±10% supply, and hardware-enforced port arbitration without external logic.

Technical Context

The 7027L20PF implements fully asynchronous dual-port operation with independent left/right control, address, and I/O buses. Its on-chip arbitration logic resolves contention via address-match or chip-enable timing, generating BUSY flags (push-pull, not open-drain) to stall conflicting writes - critical for lock-free shared-memory protocols.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2 addressing of eight flag registers, with write-to-flag and read-from-flag cycles defined by CE=VIH/SEM=VIL conditions. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (7FFE_H/7FFF_H), enabling event-driven inter-processor messaging.

Key Specifications

Pinout & Package

7027L20PF is housed in a 100-pin TQFP (Thin Quad Flatpack) with 0.5 mm pitch, 14 mm × 14 mm footprint, and exposed thermal pad (not electrically connected). All VCC and GND pins must be 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-20AC and R1EX24032AS0I-20, the 7027L20PF uniquely integrates master/slave chaining, on-chip semaphore registers, and push-pull BUSY signaling - reducing system-level latency by up to 45 ns and eliminating four external logic ICs in typical implementations.

Availability

7027L20PF is available at Aetrix Electronics and suitable for industrial PLC backplanes, avionics data concentrators, and medical imaging frame stores requiring stable component supply, long-term lifecycle support, and guaranteed traceability.

Supply support for 7027L20PF 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 fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 7027L20PF belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where hardware-enforced arbitration and low-latency shared memory are non-negotiable.

FAQ

What is the operating temperature range for the 7027L20PF?

The 7027L20PF is rated for industrial temperature operation from –40°C to +85°C, validated across all electrical parameters including 20 ns access time, 1 mW standby current, and BUSY arbitration timing. This range supports deployment in factory automation controllers, outdoor telecom equipment, and vehicle-mounted test instruments without derating.

Does the 7027L20PF support true simultaneous read/write to the same memory location?

Yes, the 7027L20PF features true dual-ported memory cells that permit concurrent read and write operations to identical addresses - a core architectural feature confirmed in the functional block diagram and truth tables. This eliminates bus contention and enables lock-free data exchange between co-processors without software overhead.

How does the M/S pin affect BUSY signal behavior on the 7027L20PF?

When M/S = VIH, the 7027L20PF operates as a master: BUSYL and BUSYR become push-pull outputs asserting during arbitration. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes upon assertion - enabling daisy-chained arbitration across multiple devices without external logic.

Can the 7027L20PF be used in a 32-bit data bus configuration?

Yes, the 7027L20PF supports 32-bit bus expansion via its Master/Slave select (M/S) feature. Two devices can be cascaded - one as master (M/S = VIH), one as slave (M/S = VIL) - with BUSY signals coordinating access, enabling full-speed, error-free 32-bit word transfers without additional discrete logic or timing penalties.

What is the purpose of the SEM pins on the 7027L20PF?

The SEML and SEMR pins enable access to the eight on-chip semaphore registers. When CE = VIH and SEM = VIL, the device enters semaphore mode - allowing atomic read/write of flag states via I/O0 and A0–A2. This provides hardware-enforced mutual exclusion for shared resources across ports, critical for real-time OS task synchronization.