Renesas 7025S25PF

Overview

7025S25PF from IDT is a high-speed 8K × 16 (128 Kbit) true dual-port static RAM with independent asynchronous left/right ports, 25 ns maximum read cycle time, TTL-compatible 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables simultaneous read 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 7025S25PF datasheet, 7025S25PF pinout, 7025S25PF application, or 7025S25PF equivalent, key selection criteria include dual-port arbitration latency, BUSY flag timing under address contention, semaphore flag update pulse width, battery-backed data retention at 2 V, and compatibility with 84-pin PLCC packaging for legacy board layouts.

Technical Context

The 7025S25PF implements full hardware port arbitration with on-chip logic that resolves simultaneous access via BUSY flag assertion-either by chip enable (M/S = H) or address match (M/S = L). Its semaphore subsystem uses A0–A2 to select among eight flags, written via I/O0 and read across I/O0–I/O15, with tSOP = 10 ns guaranteed.

It operates fully asynchronously per port: reads require only CE, OE, UB/LB, and address setup; writes are controlled by R/W, CE, and byte enables. Power management includes four standby modes (ISB1–ISB4), with ISB3 ≤ 0.2 mA typical for CMOS-level inputs and full retention at VCC = 2 V.

Key Specifications

Pinout & Package

7025S25PF is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), with lead pitch of 0.05 inches and body size ≈ 1.12 in × 1.12 in × 0.16 in. All VCC and GND pins must be decoupled locally per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and IDT70V25S25PF, the 7025S25PF uniquely combines 5 V TTL compatibility, hardware semaphore support, and 2 V data retention in the industry-standard 84-pin PLCC package - making it irreplaceable for retrofitting or sustaining industrial control systems requiring robust, drop-in dual-port memory.

Availability

7025S25PF is available at Aetrix Electronics and suitable for industrial motion controllers, avionics display units, and redundant communication gateways requiring stable component supply across extended product lifecycles.

Supply support for 7025S25PF 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 sensor solutions, now part of Renesas Electronics.

The IDT7025 family was designed specifically for real-time embedded systems demanding deterministic dual-port memory access, hardware-based inter-processor synchronization, and industrial-grade reliability - targeting motor control, test equipment, and aerospace platforms.

FAQ

What is the maximum operating temperature range for the 7025S25PF?

The 7025S25PF is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all AC and DC specifications including tRC = 25 ns, ISB3 ≤ 0.2 mA, and VIL/VOL thresholds. It does not support military-grade –55°C to +125°C operation - that capability applies only to specific 7025X70 variants.

Does the 7025S25PF support battery backup data retention?

Yes, the 7025S25PF supports data retention down to VCC = 2.0 V, with ICCDR ≤ 4000 µA across the industrial temperature range. This feature is intrinsic to the "L" variant designation in the IDT7025L series; the "S" in 7025S25PF indicates standard power, but the part retains full 2 V retention capability as confirmed in Table 10 of the datasheet.

How does the BUSY flag operate in master vs. slave configuration on the 7025S25PF?

When M/S = H, BUSYL/BUSYR function as outputs asserting contention; when M/S = L, they become inputs accepting BUSY signals from a master device. The 7025S25PF's BUSY timing (tBAA ≤ 20 ns, tBDD ≤ 30 ns) ensures deterministic resolution of simultaneous accesses - critical for lock-free inter-processor communication in real-time systems.

Can the 7025S25PF be used in a 32-bit memory system without external logic?

Yes - the 7025S25PF supports native 32-bit expansion via Master/Slave cascading. Two devices can be configured with M/S = H (master) and M/S = L (slave), using BUSY handshake and shared address/data buses to achieve full-speed, error-free 32-bit word access without discrete gates or CPLDs, as documented in the functional description and timing waveforms.

What are the key differences between the 7025S25PF and the IDT70V25S25PF?

The 7025S25PF uses 5 V TTL I/O and supports 2 V data retention; the IDT70V25S25PF is a 3.3 V LVCMOS variant with lower power (95 mA typ) but no battery backup capability. Both share 25 ns speed and 84-pin PLCC packaging, but voltage incompatibility prevents direct substitution without level-shifting or redesign.