Renesas 7027L25PF8

Overview

7027L25PF8 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, 25 ns maximum access time, 1 mW typical standby power, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It serves as a master/slave-configurable shared memory buffer in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 7027L25PF8 datasheet, 7027L25PF8 pinout, 7027L25PF8 application, or 7027L25PF8 equivalent, key selection criteria include bus arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore flag update pulse (tSOP = 12 ns), and dual-chip-enable depth expansion capability without external logic.

Technical Context

The 7027L25PF8 implements fully asynchronous dual-port operation with independent left/right address, control, and I/O buses. Its on-chip arbitration logic resolves contention via address-match or chip-enable-triggered BUSY assertion, with tBDD ≤ 25 ns for port-to-port write-read validity assurance.

It supports semaphore signaling across eight flags addressed by A0–A2, accessed only when CE = VIH and SEM = VIL, and provides interrupt generation via dedicated mailbox addresses (7FFE_H for INTL, 7FFF_H for INTR), with tINS/tINR ≤ 20 ns.

Key Specifications

Pinout & Package

7027L25PF8 is packaged in a 100-pin Thin Quad Flatpack (TQFP) with 14 mm × 14 mm body and 1.4 mm height. All VCC pins require connection to 5 V supply; all GND pins must be grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and IDT70V27L25PF, the 7027L25PF8 uniquely delivers 5 V TTL compatibility, M/S-configurable arbitration, and identical pinout to legacy IDT7027S variants-enabling drop-in replacement in existing industrial and avionics platforms without layout changes.

Availability

7027L25PF8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics flight computers, medical imaging subsystems, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7027L25PF8 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. It pioneered high-performance dual-port SRAM architectures for real-time embedded systems.

The 7027L25PF8 belongs to IDT's legacy 7027 family of dual-port SRAMs, designed specifically for deterministic inter-processor communication in safety-critical industrial and aerospace applications where hardware-enforced arbitration and low-latency shared memory are mandatory.

FAQ

What is the operating voltage range for the 7027L25PF8?

The 7027L25PF8 operates from a single 5.0 V ±10% supply (4.5 V to 5.5 V), making it compatible with standard TTL logic families without level-shifting circuitry. This voltage range is specified across the full industrial temperature range (–40°C to +85°C) and supports both commercial and industrial speed grades. The 7027L25PF8 does not support 3.3 V operation.

How does the BUSY arbitration mechanism work on the 7027L25PF8?

The 7027L25PF8 asserts BUSY when address or chip-enable signals match between ports, blocking writes until contention clears. With M/S = VIH (master), BUSY is an output that signals contention to the slave port; with M/S = VIL (slave), BUSY is an input that inhibits local writes. The 7027L25PF8 guarantees resolution within tBDD ≤ 25 ns, ensuring deterministic behavior in real-time systems.

Can the 7027L25PF8 be used in a 32-bit data bus configuration?

Yes-the 7027L25PF8 supports 32-bit expansion via master/slave cascading using the M/S pin. When configured as master (M/S = VIH), it drives BUSY to coordinate with a slave device (M/S = VIL). Two 7027L25PF8 devices can be combined to form a 32K × 32-bit memory without external logic, maintaining full-speed operation and error-free arbitration as documented in the IDT7027 functional description.

What is the purpose of the semaphore function in the 7027L25PF8?

The 7027L25PF8 includes eight hardware semaphore flags accessed via A0–A2 when CE = VIH and SEM = VIL. These flags enable atomic resource locking between processors-e.g., one port writes "0" to claim a flag, the other reads it to detect availability. The 7027L25PF8 guarantees tSOP = 12 ns semaphore update pulse width, ensuring reliable interlock coordination without software overhead.

Does the 7027L25PF8 support interrupt generation, and how is it implemented?

Yes-the 7027L25PF8 generates interrupts via dedicated mailbox addresses: writing to 7FFF_H asserts INTR, and writing to 7FFE_H asserts INTL. Each flag is cleared by reading its respective address. Timing is guaranteed with tINS/tINR ≤ 20 ns. These interrupts serve as hardware-acknowledged messaging channels between ports, and the 7027L25PF8 treats unused mailbox locations as standard SRAM if interrupts are disabled.