Renesas 7025S25PF8

Overview

IDT7025S25PF8 from Integrated Device Technology (IDT) is a high-speed 8K × 16-bit true dual-ported static RAM with 25 ns maximum access time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It supports simultaneous independent read/write access on left and right ports, features on-chip semaphore logic and BUSY arbitration, and is used in real-time embedded systems requiring deterministic memory coherency-such as digital signal processors interfacing with FPGA peripherals.

For engineers reviewing the IDT7025S25PF8 datasheet, IDT7025S25PF8 pinout, IDT7025S25PF8 application, or IDT7025S25PF8 equivalent, key selection considerations include its 25 ns read cycle time, dual-port arbitration behavior under M/S = H/L configuration, battery-backed data retention at 2V (L-version), and compatibility with 84-pin PLCC packaging for legacy board layouts.

Technical Context

The IDT7025S25PF8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access without external synchronization. Its on-chip arbitration logic resolves contention via BUSY flag assertion (output on Master, input on Slave) and supports semaphore signaling across ports using A0–A2 address lines to select one of eight flags.

It operates in two distinct functional modes: standalone 128K-bit dual-port RAM or cascaded MASTER/SLAVE configuration for 32-bit+ word systems. The M/S pin selects mode-high enables BUSY output and master arbitration priority; low configures BUSY as input and defers to external master-enabling scalable memory expansion without discrete glue logic.

Key Specifications

Pinout & Package

Package: 84-pin Plastic Leaded Chip Carrier (PLCC), JEDEC MS-026AC compliant, body size ≈ 29.2 mm × 29.2 mm × 3.9 mm.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C136-25JC and R1EX24002AS0C, the IDT7025S25PF8 uniquely delivers integrated semaphore arbitration and 25 ns performance in a legacy-compatible 84-pin PLCC, making it irreplaceable in deterministic real-time systems where hardware-coordinated memory access is mandatory.

Availability

IDT7025S25PF8 is available at Aetrix Electronics and suitable for DSP-FPGA interfaces, industrial PLCs, avionics DAQ modules, and legacy military comms upgrades requiring stable component supply and long-term obsolescence management.

Supply support for IDT7025S25PF8 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

Integrated Device Technology (IDT) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019.

The IDT7025S25PF8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for real-time embedded systems demanding deterministic memory coherency between heterogeneous processors or ASICs.

FAQ

What is the maximum operating temperature range for the IDT7025S25PF8?

The IDT7025S25PF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the DC Operating Conditions table (Table 5) and applies across all speed grades including the 25 ns version. It does not support extended military temperature ranges unless explicitly ordered as a MIL-spec variant (e.g., IDT7025S25PF8M).

Does the IDT7025S25PF8 support battery backup operation?

Yes, the IDT7025S25PF8 supports data retention at 2V, as specified in Table 10 (Data Retention Characteristics). However, this feature is only guaranteed for the "L" (low-power) version of the part family. The "S" suffix in IDT7025S25PF8 indicates standard power consumption, so battery backup is not characterized or warranted for this specific variant.

Is the IDT7025S25PF8 pin-compatible with other members of the IDT7025 family?

Yes, all IDT7025 variants-including IDT7025S25PF8, IDT7025S20PF8, and IDT7025L25PF8-share identical 84-pin PLCC pinouts and electrical interface definitions. Differences are limited to access time, power consumption, and temperature grade; no PCB layout changes are required when substituting within the same package type.

How does the BUSY arbitration mechanism work in the IDT7025S25PF8?

In the IDT7025S25PF8, BUSY arbitration activates when both ports attempt access to the same memory address. With M/S = H (Master), BUSYR outputs a low signal within 20 ns (max) to block the right port's write. With M/S = L (Slave), BUSYR becomes an input-allowing external master control. Timing parameters tBAA, tBDA, and tBDD define response windows and are validated per AC Table 14a.

Can the IDT7025S25PF8 be used in a 32-bit data path configuration?

Yes, the IDT7025S25PF8 supports 32-bit expansion via Master/Slave cascading. Two devices can be connected using the M/S pin and BUSY signal: one configured as Master (M/S = H) drives BUSY to the Slave (M/S = L), enabling synchronized 32-bit word access without external logic. This is explicitly documented in the device description and functional block diagram.