Renesas 7025S45PFI8

Overview

7025S45PFI8 from IDT (Integrated Device Technology) is a high-speed 8K × 16-bit true dual-port static RAM with independent left/right ports, 45 ns maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous asynchronous access, on-chip semaphore arbitration, and battery-backed data retention down to 2V - used in real-time embedded systems requiring deterministic dual-processor memory coherency.

For engineers reviewing the 7025S45PFI8 datasheet, 7025S45PFI8 pinout, 7025S45PFI8 application, or 7025S45PFI8 equivalent, key selection considerations include BUSY-flag arbitration timing (tBAA ≤ 20 ns), dual-port write recovery (tWR = 0 ns), byte-selectable I/O control (UBL/LBL), 84-pin PLCC package compatibility, and full CMOS-level standby current (ISB3 ≤ 0.2 mA for L-version).

Technical Context

The 7025S45PFI8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via hardware BUSY flag assertion (M/S = H for master output) and supports both address-match and chip-enable arbitration modes with tAPS = 5 ns priority setup.

It integrates eight semaphore flags accessible via A0–A2 addressing and controlled by SEM/UB/LB signals, enabling inter-processor synchronization without external logic. The device operates in three power states: active (ICC ≤ 155 mA typ.), TTL-level standby (ISB1 ≤ 13 mA), and full CMOS-level standby (ISB3 ≤ 0.2 mA), with data retention at VCC = 2V.

Key Specifications

Pinout & Package

7025S45PFI8 is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC) package with 0.050″ lead pitch and JEDEC MO-047AC outline. 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 CY7C1370D-45BGXI and AS7C38099B-45PCN, the 7025S45PFI8 uniquely delivers integrated BUSY-flag arbitration and eight hardware semaphores in a 5V 84-pin PLCC package - essential for deterministic real-time systems where external logic adds latency or reliability risk.

Availability

7025S45PFI8 is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and dual-core DSP interfaces requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 7025S45PFI8 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 timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7025 family was designed specifically for high-reliability dual-processor systems requiring deterministic memory coherency - targeting industrial control, military computing, and telecom infrastructure where software-managed memory sharing introduces unacceptable latency or failure modes.

FAQ

What is the maximum operating temperature range for the 7025S45PFI8?

The 7025S45PFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings table and DC Electrical Characteristics section of the official IDT datasheet DSC 2683/13. It does not support extended military-grade ranges (–55°C to +125°C) unless explicitly ordered as a MIL-spec variant - the 'PFI8' suffix denotes industrial PLCC packaging.

Does the 7025S45PFI8 support true simultaneous read operations from both ports?

Yes, the 7025S45PFI8 supports true simultaneous reads from both left and right ports - including reads to the same memory location - due to its true dual-ported memory cell architecture. This capability is explicitly stated in the Features section and verified in Truth Table I under "Non-Contention Read/Write Control", where CE, R/W, and OE states permit concurrent outputs without conflict.

How does the BUSY arbitration mechanism work on the 7025S45PFI8?

The 7025S45PFI8 uses hardware-based BUSY arbitration triggered by address or chip-enable contention. When M/S = H (master), BUSY is an output that asserts within tBAA ≤ 20 ns of address match or CE assertion, blocking the contending port's write. When M/S = L (slave), BUSY is an input requiring external assertion. Timing parameters tBDD, tAPS, and tWH ensure deterministic resolution - all defined in Table 14a/b of the datasheet.

What is the data retention voltage requirement for the 7025S45PFI8?

The 7025S45PFI8 supports data retention at VCC = 2.0 V minimum, as specified in Table 10 (Data Retention Characteristics). This applies only to the 'L' (low-power) version - confirmed by ICCDR ≤ 4000 µA max over full temperature range. The 'S' version does not guarantee retention below 4.5 V. The 7025S45PFI8 is an 'S' variant, so it does not support 2V retention; retention capability is exclusive to IDT7025L parts.

Is the 7025S45PFI8 pin-compatible with other members of the IDT7025 family?

Yes, the 7025S45PFI8 shares identical 84-pin PLCC pinout with all IDT7025 variants in the same package type (e.g., 7025S20PFI8, 7025S25PFI8), including matching signal names, power/ground locations, and control pin assignments as shown in Pin Configuration drawings 2683 drw 02 and 2683 drw 04. Speed grade differences (e.g., 20 ns vs. 45 ns) do not affect pin mapping or electrical interface compatibility.