Renesas 7025L17PFI

Overview

7025L17PFI from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent 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 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 7025L17PFI datasheet, 7025L17PFI pinout, 7025L17PFI application, or 7025L17PFI equivalent, key selection considerations include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore contention window (tSPS = 5 ns), and low-power standby current (ISB3 = 0.2 mA typ. at CMOS-level inputs).

Technical Context

The 7025L17PFI implements fully asynchronous dual-port operation with on-chip port arbitration logic and hardware semaphore signaling across eight flags addressed by A0–A2. Its architecture supports simultaneous reads of identical addresses without conflict, using dedicated BUSY output (Master) or BUSY input (Slave) controlled by the M/S pin.

It features separate upper-byte (UB/UBR) and lower-byte (LB/LBR) enables for multiplexed bus compatibility, TTL-compatible 5V ±10% single-supply operation, and automatic power-down via chip enable (CE) with two-tier standby modes - TTL-level (ISB1 = 20 mA typ.) and CMOS-level (ISB3 = 0.2 mA typ.).

Key Specifications

Pinout & Package

7025L17PFI is packaged in an 84-pin PLCC (Plastic Leaded Chip Carrier) with 0.050" lead pitch and JEDEC MO-052AC outline. Pin 1 is marked by a corner notch; package body measures approximately 1.15 in × 1.15 in × 0.17 in.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-167BZC and AS7C3256A-15JC, the 7025L17PFI uniquely delivers integrated hardware arbitration, 2V data retention, and 5V TTL compatibility - making it irreplaceable in deterministic industrial control and legacy avionics where pin-level timing predictability and battery backup are mandatory.

Availability

7025L17PFI is available at Aetrix Electronics and suitable for industrial motion controllers, avionics display buffers, and radar signal processors requiring stable component supply across extended product lifecycles.

Supply support for 7025L17PFI 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 high-performance timing, memory, and interface solutions before its acquisition by Renesas Electronics in 2019.

The 7025L17PFI belongs to IDT's legacy dual-port SRAM product line, designed specifically for real-time embedded systems demanding deterministic latency, hardware-based inter-processor synchronization, and robust operation across military and industrial temperature ranges.

FAQ

What is the guaranteed maximum read cycle time for the 7025L17PFI?

The 7025L17PFI has a guaranteed maximum read cycle time (tRC) of 17 ns across the full industrial temperature range (–40°C to +85°C) and 5.0 V ±10% supply. This specification is production-tested and applies to both ports under worst-case voltage and temperature conditions, ensuring deterministic timing for hard real-time applications.

Does the 7025L17PFI support battery backup operation, and what voltage is required?

Yes, the 7025L17PFI supports battery backup operation with guaranteed data retention down to 2.0 V (VDR). In data retention mode, it draws only 100 µA typical (ICCDR) when CE is deasserted and inputs are held at valid logic levels, enabling multi-year retention using small lithium or supercapacitor backup sources.

How does the M/S pin affect BUSY signal behavior on the 7025L17PFI?

When M/S = H, the 7025L17PFI operates as Master: BUSYL/BUSYR are push-pull outputs that assert during port contention. When M/S = L, it operates as Slave: BUSYL/BUSYR become inputs used to block writes until the Master releases contention - enabling hierarchical arbitration in cascaded configurations without external logic.

What is the function of the SEM pin on the 7025L17PFI, and how are semaphores accessed?

The SEML/SEMR pins enable hardware semaphore access. When SEM = L, the device enters semaphore mode: A0–A2 select one of eight flags, and I/O0 writes the flag value while I/O0–I/O15 read it. This provides atomic lock/unlock operations without software intervention, critical for safe multi-processor resource sharing.

Can the 7025L17PFI be used in a 32-bit data bus configuration, and how is this implemented?

Yes, the 7025L17PFI supports 32-bit expansion via MASTER/SLAVE cascading. Two devices are connected with M/S = H (Master) and M/S = L (Slave); the Master's BUSY output drives the Slave's BUSY input. Address and control lines are shared, while data buses are concatenated - enabling full 32-bit word access without external decoding or timing compensation.