Renesas 7025S45PF

Overview

7025S45PF from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with simultaneous independent access on left and right ports, 45 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit memory expansion via master/slave cascading in real-time control systems requiring deterministic arbitration.

For engineers reviewing the 7025S45PF datasheet, 7025S45PF pinout, 7025S45PF application, or 7025S45PF equivalent, this page delivers verified timing parameters (tRC = 45 ns, tAA = 45 ns), BUSY/INT/SEM signaling behavior, power modes (active 155 mA typ., standby 16 mA typ.), and precise package mapping for PLCC-84 footprint integration.

Technical Context

The 7025S45PF implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling concurrent read/write operations-even to the same memory location-under hardware-managed arbitration. Its on-chip semaphore logic supports eight flag registers accessed via A0–A2 and I/O0–I/O15, with dedicated SEM, INT, and BUSY signals for inter-port coordination.

It features two distinct power management states: TTL-level standby (ISB1 = 16 mA typ.) and CMOS-level full standby (ISB3 = 1.0 mA typ.), plus battery backup capability down to 2V for data retention. The M/S pin configures master (BUSY output) or slave (BUSY input) mode for cascaded 32-bit+ systems without external logic.

Key Specifications

Pinout & Package

7025S45PF is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) with 0.050″ lead pitch, body size ≈ 1.12″ × 1.12″ × 0.16″, and standard JEDEC MO-048A outline. Pin 1 identifier is marked by a notch or dot at the top-left corner of the package.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-45JC, the 7025S45PF integrates BUSY arbitration and M/S configuration, eliminating external logic; versus IDT70V25S45PF, it maintains 5V compatibility at higher active current but enables direct legacy system integration without voltage translation.

Availability

7025S45PF is available at Aetrix Electronics and suitable for industrial motion controllers, redundant PLC modules, dual-CPU communication buffers, and automated test equipment requiring stable component supply across extended product lifecycles.

Supply support for 7025S45PF 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 high-performance timing, memory, interface, and RF solutions for communications, computing, and industrial markets.

The IDT7025 family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, battery backup, and seamless 32-bit+ memory expansion without external logic.

FAQ

What is the maximum operating temperature range for the 7025S45PF?

The 7025S45PF is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all DC and AC parameters in the official IDT datasheet (DSC 2683/13, October 2019), making it suitable for deployment in motor drives, factory automation controllers, and outdoor-rated instrumentation where ambient thermal stress is present.

Does the 7025S45PF support battery backup, and what voltage is required?

Yes, the 7025S45PF supports battery backup data retention at VCC = 2.0 V minimum, as confirmed in Table 10 of the datasheet. The L-version (IDT7025L) achieves 100–4000 µA retention current depending on grade; the S-version (7025S45PF) retains data at 2V with ICCDR ≤ 1500 µA (commercial grade), enabling operation from standard lithium coin cells during main power loss.

How does the M/S pin configure master vs. slave operation in the 7025S45PF?

When M/S = High, the 7025S45PF operates as Master: BUSYR functions as an output flag indicating port contention. When M/S = Low, it operates as Slave: BUSYL becomes an input that must be driven by another device's BUSYR to stall writes during arbitration. This pin enables hierarchical cascading without external logic, as detailed in Figures 11–16 of the datasheet.

What is the meaning of "45" in the part number 7025S45PF?

The "45" in 7025S45PF denotes the maximum read cycle time (tRC) of 45 ns, which is the primary speed grade identifier per IDT's naming convention. This value is guaranteed across the full industrial temperature range and defines the device's timing envelope for both read and write cycles (tWC = 45 ns), as specified in Tables 12a and 13a of the datasheet.

Can the 7025S45PF perform simultaneous reads from both ports to the same memory address?

Yes, the 7025S45PF supports true simultaneous reads to the same memory location on both ports - a core feature enabled by its dual-port SRAM cell architecture. This capability is explicitly stated in the "Features" section of the datasheet and requires no arbitration delay or BUSY assertion, unlike simultaneous read/write or write/write operations which trigger hardware arbitration.