Renesas 70V27L25PF

Overview

70V27L25PF from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true simultaneous access to the same memory location from independent left and right ports, 25ns maximum read cycle time (tRC), 660μW typical standby power, and industrial temperature support (–40°C to +85°C). It enables error-free 32-bit+ word expansion via Master/Slave cascading in real-time control systems.

For engineers reviewing the 70V27L25PF datasheet, 70V27L25PF pinout, 70V27L25PF application, or 70V27L25PF equivalent, key selection criteria include port arbitration timing (tAPS = 5ns), BUSY flag behavior under address match (tBAA ≤ 25ns), semaphore contention window (tSPS = 5ns), and LVTTL-compatible 3.3V ±0.3V single-supply operation.

Technical Context

The 70V27L25PF implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without external arbitration logic. Its on-chip arbitration logic resolves port conflicts using either address-match detection (tBAA/tBDA) or chip-enable timing (tBAC/tBDC), with BUSY asserted as push-pull output (Master) or input (Slave).

It integrates full hardware semaphore signaling across eight flags addressed by A0–A2, supporting inter-processor synchronization with tSWRD = 5ns write-to-read latency and tSPS = 5ns contention window. Power management uses dual chip enables (CE0/CE1) for per-port active/standby control, achieving ISB3 = 0.2mA full standby current under CMOS-level inputs.

Key Specifications

Pinout & Package

70V27L25PF 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 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 R1EX24032ASAS-25, the 70V27L25PF uniquely integrates hardware BUSY arbitration and semaphore registers-reducing system-level timing uncertainty and eliminating external logic, making it optimal for safety-critical real-time applications requiring guaranteed contention resolution.

Availability

70V27L25PF is available at Aetrix Electronics and suitable for industrial motion control, avionics data concentrators, medical imaging pipelines, and automotive ADAS preprocessors requiring stable component supply across extended product lifecycles.

Supply support for 70V27L25PF 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, and RF power solutions for communications, computing, and industrial markets.

The IDT70V27 family was designed specifically for high-reliability dual-processor systems requiring deterministic memory sharing-targeting applications where software-managed locks introduce unacceptable latency or jitter.

FAQ

What is the maximum operating frequency supported by the 70V27L25PF?

The 70V27L25PF does not specify a clock frequency but defines timing via absolute parameters: maximum read cycle time (tRC) is 25 ns, implying a theoretical maximum sustained access rate of 40 MHz. Actual system frequency depends on board layout, signal integrity, and control logic propagation delays-not an internal clock generator. The 70V27L25PF operates asynchronously, with no internal oscillator or PLL.

Does the 70V27L25PF support hot-swapping or dynamic voltage scaling?

No, the 70V27L25PF does not support hot-swapping or dynamic voltage scaling. It requires stable 3.3V ±0.3V supply during operation; VDD must ramp monotonically during power-up, and all control inputs must remain within valid VIH/VIL ranges before VDD reaches 2.0V. Violating absolute maximum ratings (e.g., VTERM > VDD + 0.3V) may cause permanent damage.

How does the BUSY arbitration mechanism work in Master versus Slave configuration for the 70V27L25PF?

In Master mode (M/S = VIH), BUSYL/BUSYR are push-pull outputs that assert LOW when port contention is detected-blocking writes on the contending port. In Slave mode (M/S = VIL), BUSYL/BUSYR become inputs; an external Master drives them LOW to inhibit writes. The 70V27L25PF's arbitration responds to either address match (tBAA ≤ 25ns) or chip-enable timing (tBAC ≤ 25ns), with tAPS = 5ns setup guaranteeing deterministic priority.

Can the 70V27L25PF be used in a single-port configuration?

Yes, the 70V27L25PF can operate in single-port mode by tying one port's CE0/CE1 HIGH permanently, disabling that port's circuitry and reducing active current. The enabled port functions identically to a standard 32K × 16 SRAM with full 25ns access, while the disabled port draws only 0.2 mA (ISB3). No reconfiguration or mode pins are needed-only control signal management.

What are the valid address ranges for interrupt flag triggering on the 70V27L25PF?

The 70V27L25PF triggers INTL when the right port writes to address 7FFE_H (32,766 decimal) with CER = R/WR = VIL; INTR triggers when the left port writes to 7FFF_H (32,767 decimal) under the same conditions. These are fixed, non-reprogrammable mailbox addresses defined in Truth Table IV. Writes to 7FFE_H/7FFF_H with OE enabled or CE disabled have no interrupt effect.