Renesas 7025L17PFI8

Overview

7025L17PFI8 from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 17 ns maximum read cycle time, 2V data retention for battery backup, and industrial temperature range (–40°C to +85°C). It enables simultaneous reads of the same memory location and supports MASTER/SLAVE cascading for 32-bit+ bus expansion in real-time embedded control systems.

For engineers reviewing the 7025L17PFI8 datasheet, 7025L17PFI8 pinout, 7025L17PFI8 application, or 7025L17PFI8 equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing under address contention, semaphore flag update pulse width (10 ns), low standby current (1 µA typ.), and compatibility with TTL-level 5V ±10% supply and multiplexed bus architectures.

Technical Context

The 7025L17PFI8 implements full on-chip hardware semaphore signaling using eight dedicated flags addressed via A0–A2, with tSWRD = 5 ns write-to-read delay. Its port arbitration logic resolves simultaneous access via BUSY assertion-when M/S = H (Master), BUSY is output; when M/S = L (Slave), BUSY is input-and enforces priority via tAPS = 5 ns setup time.

It operates fully asynchronously from either port, supports separate upper- and lower-byte control (UBL/LBL), and features automatic power-down via Chip Enable (CE) with ISB3 = 0.2 µA typical full-standby current under CMOS-level inputs. Data retention at 2V is guaranteed across all temperature grades.

Key Specifications

Pinout & Package

7025L17PFI8 is packaged in an 84-pin PLCC (Plastic Leaded Chip Carrier) with 0.050" lead pitch, body size ≈ 1.15 in × 1.15 in × 0.17 in. Pin 1 is marked by a corner notch; pin numbering proceeds counterclockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C133-15VC and AS7C3316P-15JC, the 7025L17PFI8 uniquely integrates hardware semaphore, MASTER/SLAVE topology, and 2V data retention-making it the sole option for robust, low-power, industrial-grade dual-CPU shared memory without external components.

Availability

7025L17PFI8 is available at Aetrix Electronics and suitable for industrial automation, avionics data exchange, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7025L17PFI8 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 high-performance memory, timing, interface, and RF solutions, now part of Renesas Electronics.

The IDT7025 product line was designed specifically for real-time embedded systems requiring deterministic dual-processor communication, such as industrial controllers, military computing, and telecom infrastructure-prioritizing hardware arbitration, low-power retention, and industrial reliability over density or cost.

FAQ

What is the guaranteed data retention voltage for the 7025L17PFI8?

The 7025L17PFI8 guarantees data retention at VCC = 2.0 V across its full industrial temperature range (–40°C to +85°C), with ICCDR ≤ 4000 µA max. This enables direct connection to a 2V lithium battery or backup supply without regulation, preserving memory contents during main power failure. The specification is characterized but not production-tested per datasheet Table 10.

Does the 7025L17PFI8 support true simultaneous read access to the same memory location from both ports?

Yes, the 7025L17PFI8 uses true dual-ported memory cells that allow simultaneous reads of identical addresses on left and right ports without contention or arbitration delay. This is confirmed in the Features section and Truth Table I, where non-contention read modes show concurrent DATAOUT on both I/O buses when CE, R/W, and OE are asserted appropriately.

How does the M/S pin affect BUSY signal behavior on the 7025L17PFI8?

When M/S = H, the 7025L17PFI8 operates as Master: BUSYL/BUSYR are push-pull outputs asserting busy during address contention. When M/S = L, it operates as Slave: BUSYL/BUSYR become inputs sampled by the device to coordinate with a Master in cascaded configurations. This is explicitly defined in the Functional Block Diagram notes and Pin Names table.

What is the minimum pulse width required to update a semaphore flag in the 7025L17PFI8?

The 7025L17PFI8 requires a minimum 10 ns pulse width on OE or SEM (tSOP = 10 ns) to reliably update semaphore flags, as specified in AC Electrical Characteristics Table 12a. This applies to both left and right ports and is independent of address or data setup timing.

Can the 7025L17PFI8 operate with mixed voltage interfaces, such as 3.3V I/O driving its 5V inputs?

No-the 7025L17PFI8 is a 5V-only device with TTL-compatible inputs (VIH min = 2.2 V, VIL max = 0.8 V) and requires VCC = 4.5–5.5 V. Driving its inputs with 3.3V logic may violate VIH margin under worst-case conditions and is not supported. Level-shifting circuitry is required for interfacing with 3.3V systems.