Renesas 7025L15PFI8

Overview

7025L15PFI8 from IDT (now Renesas) is a high-speed 8K × 16-bit true dual-port static RAM with independent left/right ports, 15 ns max read cycle time (commercial grade), 2V data retention for battery backup, and on-chip semaphore arbitration logic. It enables simultaneous asynchronous access to the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7025L15PFI8 datasheet, 7025L15PFI8 pinout, 7025L15PFI8 application, or 7025L15PFI8 equivalent, key selection criteria include dual-port contention resolution timing (tBDD ≤ 30 ns), low standby current (1 µA typ. at 2V), TTL-compatible 5V ±10% supply, and 84-pin PLCC packaging for industrial temperature operation (–40°C to +85°C).

Technical Context

The 7025L15PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external arbitration logic. Its on-chip hardware semaphore logic uses A0–A2 addressing to manage eight shared flags between ports.

Port arbitration relies on BUSY flag generation (M/S = H for master output; M/S = L for slave input) and priority setup timing (tAPS = 5 ns), ensuring deterministic resolution during address-contention events. The device supports both R/W-controlled and CE/UB/LB-controlled write cycles with defined tDW, tDH, and tWZ timing windows.

Key Specifications

Pinout & Package

7025L15PFI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050" lead pitch, JEDEC MO-047A compliant, suitable for reflow soldering and industrial PCB layouts.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-100AXI and IDT70V25L15PF8, the 7025L15PFI8 uniquely combines 5V TTL compatibility, 2V data retention, and integrated hardware arbitration-making it irreplaceable in legacy industrial and avionics systems requiring zero-software-synchronization memory sharing.

Availability

7025L15PFI8 is available at Aetrix Electronics and suitable for real-time motion control, digital signal processing buffers, avionics data acquisition, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.

Supply support for 7025L15PFI8 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 timing, memory, and interface solutions for high-performance computing and communications infrastructure.

The IDT7025 family was designed specifically for deterministic, low-latency memory sharing between heterogeneous processors-targeting aerospace, industrial automation, and telecom baseband subsystems demanding hardware-enforced coherency.

FAQ

What is the maximum guaranteed read cycle time for the 7025L15PFI8 under commercial conditions?

The 7025L15PFI8 guarantees a maximum read cycle time (tRC) of 15 ns under commercial temperature and voltage conditions (0°C to +70°C, VCC = 5.0 V ±10%). This specification is production-tested and applies to both ports operating independently or concurrently, provided all timing constraints-including tACE, tABE, and tAOE-are met per the datasheet's AC Electrical Characteristics table.

Does the 7025L15PFI8 support battery backup operation, and what is the minimum retention voltage?

Yes, the 7025L15PFI8 supports battery backup operation with guaranteed data retention down to 2.0 V (VDR = 2.0 V). At this voltage, typical data retention current (ICCDR) is 100 µA, and the device maintains stored contents indefinitely as long as VCC remains ≥2.0 V-verified across the industrial temperature range (–40°C to +85°C).

How does the BUSY arbitration mechanism work in the 7025L15PFI8 when both ports access the same address?

In the 7025L15PFI8, BUSY arbitration activates when both ports attempt simultaneous access to the same memory location. With M/S = H (master), BUSY is driven high to block the slave port's write until the master completes. Timing parameters tBAA (≤20 ns), tBDD (≤30 ns), and tAPS (5 ns) define response latency and priority resolution-ensuring deterministic, hardware-enforced serialization without software intervention.

Can the 7025L15PFI8 be used in MASTER/SLAVE configurations, and what pins enable this functionality?

Yes, the 7025L15PFI8 supports MASTER/SLAVE cascading via the M/S pin and BUSY signals. When M/S = H, the device operates as master with BUSYR/BUSYL outputs; when M/S = L, it acts as slave with BUSYR/BUSYL as inputs. This enables seamless 32-bit+ word expansion using multiple 7025L15PFI8 devices without external logic-only interconnect wiring and proper CE sequencing are required.

What is the standby current consumption of the 7025L15PFI8 in full-power-down mode?

In full standby mode (ISB3), where both CEL and CER are held high (VIH), all inputs are at CMOS levels (≥VCC − 0.2 V or ≤0.2 V), and SEMR/SEML are high, the 7025L15PFI8 draws just 0.2 µA typical current. This ultra-low quiescent draw enables energy-sensitive applications like battery-powered data loggers and failsafe controllers where memory must retain state for years.