Renesas 70V27S25PF8

Overview

70V27S25PF8 from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-ported static RAM with true simultaneous access to the same memory location, 25ns maximum read cycle time (tRC), 500mW typical active power, and industrial temperature support (–40°C to +85°C). It enables error-free 32-bit+ word systems via Master/Slave cascading in telecom switching fabric and real-time DSP co-processing applications.

For engineers reviewing the 70V27S25PF8 datasheet, 70V27S25PF8 pinout, 70V27S25PF8 application, or 70V27S25PF8 equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5ns), BUSY flag behavior under M/S = VIH configuration, semaphore address access (tSAA ≤ 35ns), and LVTTL-compatible 3.3V ±0.3V single-supply operation with full on-chip semaphore signaling support.

Technical Context

The 70V27S25PF8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses-enabling concurrent read/write operations without external arbitration logic. Its on-chip port arbitration logic resolves contention via address-match or chip-enable-triggered BUSY assertion, with tBDD ≤ 35ns delay from BUSY deassertion to valid data.

It supports two distinct operational modes: as a standalone 512K-bit dual-port SRAM, or as Master/Slave pair for 32-bit+ bus expansion using M/S pin configuration-where M/S = VIH enables BUSY output flag generation and M/S = VIL configures BUSY as input to inhibit writes during contention.

Key Specifications

Pinout & Package

70V27S25PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VDD pins require local 3.3V decoupling; all VSS pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-25AXC and AS7C33256PFS-25BIN, the 70V27S25PF8 uniquely integrates hardware semaphore signaling, configurable BUSY arbitration, and Master/Slave cascading-reducing system-level logic count and improving determinism in tightly coupled multi-processor systems.

Availability

70V27S25PF8 is available at Aetrix Electronics and suitable for telecom switching fabric, DSP co-processing buffers, industrial PLC I/O modules, and avionics data concentrators requiring stable component supply across extended product lifecycles.

Supply support for 70V27S25PF8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The IDT70V27 family was designed specifically for high-reliability dual-ported memory applications in real-time systems-emphasizing deterministic arbitration, low-latency access, and seamless bus-width scalability without external logic.

FAQ

What is the maximum operating frequency supported by the 70V27S25PF8?

The 70V27S25PF8 does not specify a clock frequency-it is a fully asynchronous static RAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 25 ns, corresponding to an effective throughput of up to 40 MHz for consecutive accesses. Actual system bandwidth depends on address/control setup/hold times and bus turnaround overhead-not a fixed clock rate.

Does the 70V27S25PF8 support both commercial and industrial temperature ranges?

Yes, the 70V27S25PF8 is qualified for industrial temperature range (–40°C to +85°C). The "S" suffix denotes standard power version, and the "25" indicates 25 ns speed grade-available in industrial grade. Commercial grade (0°C to +70°C) variants exist but are designated separately (e.g., 70V27S25PF).

How does the Master/Slave (M/S) pin affect BUSY signal behavior in the 70V27S25PF8?

When M/S = VIH, the 70V27S25PF8 operates as Master: BUSYL and BUSYR are push-pull outputs that assert during port contention to block writes. When M/S = VIL, it operates as Slave: BUSYL and BUSYR become inputs that must be driven externally to inhibit writes-enabling hierarchical arbitration in multi-device systems.

Can the 70V27S25PF8 be used without external arbitration logic?

Yes-the 70V27S25PF8 includes full on-chip arbitration logic. Its BUSY flag generation (via address match or CE timing), tAPS = 5 ns priority setup, and automatic write inhibition when BUSY is active eliminate the need for external arbitration components in most dual-processor or FPGA+CPU configurations.

What is the function of the semaphore enable (SEML/SEMR) pins on the 70V27S25PF8?

The SEML and SEMR pins enable access to the internal 8-flag semaphore register bank. When SEM = VIL and CE = VIH, the device enters semaphore mode-allowing atomic read/write of semaphore flags via I/O0–I/O15 using A0–A2 as flag address bits. This provides hardware-accelerated inter-port synchronization without software intervention.