Renesas 7025S20PF8

Overview

7025S20PF8 from IDT (Integrated Device Technology) is a high-speed, 8K × 16-bit true dual-port static RAM with independent asynchronous left/right ports, 20 ns maximum read cycle time (tRC), TTL-compatible 5V ±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 7025S20PF8 datasheet, 7025S20PF8 pinout, 7025S20PF8 application, or 7025S20PF8 equivalent, key selection considerations include BUSY arbitration timing (tBAA ≤ 20 ns), semaphore flag support (8 flags via A0–A2), byte-selectable I/O (UBL/LBL), on-chip port arbitration logic, and battery backup data retention at 2V (IDT7025L variant).

Technical Context

The 7025S20PF8 implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention using either address-match or chip-enable priority schemes, with BUSY assertion governed by M/S pin configuration (master output / slave input).

It integrates full hardware semaphore signaling across ports via dedicated SEM pins and I/O0–I/O15, enabling inter-processor synchronization without external logic. The device supports both R/W-controlled and CE/UB/LB-controlled write cycles, with tDW = 15 ns and tWH = 15 ns ensuring reliable write-hold timing under BUSY arbitration.

Key Specifications

Pinout & Package

7025S20PF8 is packaged in an 84-pin Plastic Leaded Chip Carrier (PLCC), with 4 corner pins designated as GND and 4 as VCC for robust power distribution and noise immunity. Pin layout follows standard IDT dual-port RAM conventions with mirrored left/right port signal groups.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-20VXI and AS7C38098B-20TIN, the 7025S20PF8 uniquely delivers integrated M/S-configurable BUSY arbitration and seamless master/slave cascading - critical for deterministic real-time systems where external arbitration logic adds latency and board area.

Availability

7025S20PF8 is available at Aetrix Electronics and suitable for industrial motion controllers, avionics display buffers, telecom line cards, medical imaging modules, and military data acquisition systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 7025S20PF8 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. Known for high-reliability, high-performance memory and interface ICs.

The IDT7025 product line was designed specifically for deterministic real-time embedded systems requiring hardware-synchronized dual-processor communication - targeting aerospace, industrial automation, and medical imaging applications demanding zero-software-overhead memory sharing.

FAQ

What is the operating temperature range for the 7025S20PF8?

The 7025S20PF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (Table 2683 tbl 05) and applies to all speed grades including the 20 ns version. It is not rated for commercial (0°C to +70°C) or military (–55°C to +125°C) ranges unless explicitly ordered with those suffixes.

Does the 7025S20PF8 support battery backup data retention?

No - the 7025S20PF8 is the "S" (standard power) variant and does not support 2V data retention. Battery backup capability is exclusive to the "L" (low-power) variant (e.g., 7025L20PF8), which specifies ICCDR ≤ 4000 µA at VCC = 2V. The "S" suffix in 7025S20PF8 indicates active power consumption optimized for performance, not retention.

How does the M/S pin affect BUSY functionality on the 7025S20PF8?

When M/S = HIGH, the device operates as a master: BUSYL and BUSYR are outputs that assert during port contention. When M/S = LOW, it operates as a slave: BUSYL and BUSYR become inputs used to receive BUSY signals from a master device. This configuration enables daisy-chained arbitration in multi-device 32-bit+ memory systems, as detailed in the Functional Block Diagram and Truth Table II.

Can the 7025S20PF8 be used in a single-port configuration?

Yes - the 7025S20PF8 can operate with only one port active by holding the opposing port's CE pin high (e.g., CER = VIH) while using CEL, R/WL, and associated signals. All timing parameters (e.g., tRC, tAA) remain valid for the enabled port. Unused I/O and address pins should be terminated per standard SRAM practice, but no functional degradation occurs.

What package type is used for the 7025S20PF8?

The 7025S20PF8 uses an 84-pin Plastic Leaded Chip Carrier (PLCC) package, identified by the "PF8" suffix per IDT's ordering nomenclature. This matches the PLG84(4)/FP84(4) mechanical outline shown in Drawing 2683 drw 02, with body dimensions approximately 1.15 in × 1.15 in × 0.17 in and gull-wing leads for surface-mount assembly.