Renesas 7027L20PFI

Overview

7027L20PFI from IDT (Integrated Device Technology) is a high-speed 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous 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. It serves as a master/slave-configurable memory buffer in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7027L20PFI datasheet, 7027L20PFI pinout, 7027L20PFI application, or 7027L20PFI equivalent, key selection considerations include industrial temperature support (–40°C to +85°C), TQFP-100 packaging, dual 16-bit independent I/O buses, hardware semaphore signaling, and BUSY-flag-controlled port arbitration for conflict-free multi-CPU memory sharing.

Technical Context

The 7027L20PFI implements fully asynchronous dual-port operation with separate left/right address, control, and data buses - each supporting independent read/write cycles without external synchronization. Its on-chip arbitration logic resolves contention via address-match or chip-enable timing, generating BUSY flags to stall conflicting writes.

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) accessible via CE = VIH/SEM = VIL mode, with write-to-I/O0 and read-from-all-I/Os behavior. The M/S pin configures master (BUSY output) or slave (BUSY input) role for cascaded 32-bit+ memory expansion.

Key Specifications

Pinout & Package

7027L20PFI is housed in a 100-pin TQFP package (JEDEC MO-140AA), with 48 I/O pins (2 × 16 data + 2 × 15 address + M/S), 10 power/ground pins (VCC/GND), and 32 control/flag pins including dual CE0/CE1, R/W, OE, UB/LB, SEM, INT, and BUSY signals per port.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V27L20PF, the 7027L20PFI uniquely delivers 5 V TTL compatibility, industrial temperature range, and drop-in replaceability in legacy 5 V dual-processor systems without voltage translation or layout changes.

Availability

7027L20PFI is available at Aetrix Electronics and suitable for real-time industrial controllers, dual-CPU communication bridges, redundant system failover memory, and legacy bus interface adapters requiring stable component supply across extended product lifecycles.

Supply support for 7027L20PFI 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, RF, and high-performance silicon solutions for communications, computing, and industrial markets.

The IDT7027 family was designed specifically for deterministic, low-latency inter-processor communication in hard real-time embedded systems - emphasizing hardware arbitration, semaphore support, and industrial reliability over general-purpose SRAM performance.

FAQ

What is the operating temperature range specified for the 7027L20PFI?

The 7027L20PFI is rated for industrial temperature operation from –40°C to +85°C. This specification is guaranteed across all electrical parameters including 20 ns maximum access time, 1 mW standby power, and full functionality of BUSY arbitration and semaphore logic - making it suitable for deployment in harsh environments such as factory automation and outdoor infrastructure.

Does the 7027L20PFI support true simultaneous access to the same memory location from both ports?

Yes, the 7027L20PFI features true dual-ported memory cells that permit concurrent read or write operations to the same address from left and right ports. When contention occurs, on-chip arbitration asserts BUSY to stall the later-arriving write, preserving data integrity - a core architectural feature confirmed in the functional block diagram and truth tables of the 7027L20PFI datasheet.

How is the master/slave configuration implemented on the 7027L20PFI?

The 7027L20PFI uses the M/S pin to configure master or slave mode: when M/S = VIH, BUSYL and BUSYR become push-pull outputs indicating port contention; when M/S = VIL, they become inputs that inhibit writes upon assertion. This configuration enables cascaded 32-bit+ memory expansion using multiple 7027L20PFI devices without external logic - as documented in the "Master/Slave select" section of the datasheet.

What is the purpose of the semaphore function in the 7027L20PFI?

The 7027L20PFI includes eight hardware semaphore flags accessed via A0–A2 when CE = VIH and SEM = VIL. These flags provide atomic resource locking between processors - writing '0' to I/O0 acquires the flag, writing '1' releases it. This eliminates software mutex overhead and race conditions, directly supporting deterministic inter-processor synchronization in RTOS-based systems using the 7027L20PFI.

Can the 7027L20PFI be used in a 3.3 V system?

No, the 7027L20PFI is a 5 V-only device with TTL-compatible inputs and outputs, specified for VCC = 4.5 V to 5.5 V. Applying 3.3 V violates the recommended operating conditions and will result in undefined behavior, including failure of BUSY arbitration and semaphore functions. For 3.3 V systems, IDT's 70V27L series (e.g., 70V27L20PF) is the functionally equivalent alternative - but it is not pin-compatible with the 7027L20PFI.