Renesas 7025S35PFI

Overview

7025S35PFI from IDT (Integrated Device Technology) is a high-speed, 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 35 ns maximum read cycle time, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It supports simultaneous reads of the same memory location and is used in real-time embedded systems requiring deterministic inter-processor communication, such as radar signal processors and avionics data concentrators.

For engineers reviewing the 7025S35PFI datasheet, 7025S35PFI pinout, 7025S35PFI application, or 7025S35PFI equivalent, key selection considerations include BUSY-flag arbitration timing (tBAA ≤ 20 ns), semaphore flag support for inter-port synchronization, battery backup data retention at 2V, and compatibility with 32-bit bus expansion via MASTER/SLAVE cascading.

Technical Context

The 7025S35PFI implements full hardware port arbitration with dedicated BUSY output (Master) or BUSY input (Slave) controlled by the M/S pin, enabling deterministic conflict resolution during simultaneous access to identical addresses. Its on-chip semaphore logic supports eight independent flags accessed via A0–A2 and I/O0–I/O15, allowing atomic resource locking between ports without external logic.

It operates fully asynchronously from either port, with separate CE, R/W, OE, UB/LB, and SEM controls per side. The device supports two distinct power modes: active operation (typ. 150 mA ICC for 7025S variant) and full standby (ISB3 ≤ 1.0 mA) when CMOS-level inputs hold CE high and all control signals stable.

Key Specifications

Pinout & Package

7025S35PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) package with 0.5 mm pitch, compliant with JEDEC MO-159. Pin 1 is located at top-left corner (marked by dot or beveled edge), with pins numbered counter-clockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and AS7C38098B-35PCN, the 7025S35PFI uniquely delivers industrial-temperature 5 V operation with integrated arbitration and 2 V data retention-critical for legacy avionics and safety-critical motion control where external logic adds failure modes and board space.

Availability

7025S35PFI is available at Aetrix Electronics and suitable for radar signal processing, avionics data concentrators, and industrial PLC motion controllers requiring stable component supply across extended product lifecycles.

Supply support for 7025S35PFI 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. It pioneered dual-port SRAM architectures for real-time embedded systems.

The 7025S35PFI belongs to IDT's legacy 7025 family of high-speed dual-port SRAMs, designed specifically for deterministic inter-processor communication in military, aerospace, and industrial control systems demanding sub-40 ns latency and hardware-enforced arbitration.

FAQ

What is the guaranteed maximum access time for 7025S35PFI across its full industrial temperature range?

The 7025S35PFI guarantees a maximum read cycle time (tRC) of 35 ns over –40°C to +85°C and VCC = 4.5 V to 5.5 V. This includes worst-case propagation through address decoders, memory cells, and output drivers, validated per MIL-PRF-38535 QML requirements for industrial-grade qualification.

Does 7025S35PFI support true simultaneous read operations from both ports to the same memory address?

Yes, the 7025S35PFI implements true dual-port memory cells that allow concurrent reads from both left and right ports to identical addresses without contention or timing penalty. This is confirmed in the Functional Block Diagram and Truth Table I, where CE, R/W, and OE states are independently controlled per port.

How does the BUSY arbitration mechanism work in 7025S35PFI when configured as Master (M/S = H)?

When M/S = H, 7025S35PFI operates as Master: BUSYL becomes an output that asserts HIGH when the left port attempts to access an address currently being written by the right port (or vice versa). The asserting port must wait until BUSY deasserts before completing the access-enforcing deterministic priority without external logic.

Can 7025S35PFI retain data during main power loss, and what is the minimum retention voltage?

Yes, the 7025S35PFI ('S' variant) supports data retention at VCC = 2.0 V minimum, as specified in Table 10. This enables integration with backup batteries or supercapacitors to preserve critical state during brownout events-verified across the full industrial temperature range.

What package type and pin count does 7025S35PFI use, and is it RoHS-compliant?

The 7025S35PFI uses a 100-pin Thin Quad Flatpack (TQFP) package (JEDEC MO-159), measuring 14 mm × 14 mm × 1.4 mm. Per IDT documentation, this variant is RoHS-compliant and qualifies as a "green part" with lead-free terminations and halogen-free molding compound.