Renesas 70V09L20PFI8

Overview

70V09L20PFI8 from Integrated Device Technology is a high-speed 128K × 8 true dual-ported static RAM with independent left/right ports, 20 ns max access time (industrial grade), 3.3 V ±0.3 V single-supply operation, and on-chip semaphore/arbiter logic for interprocessor synchronization. It enables simultaneous read/write to the same memory location in real-time embedded multiprocessor systems.

For engineers reviewing the 70V09L20PFI8 datasheet, 70V09L20PFI8 pinout, 70V09L20PFI8 application, or 70V09L20PFI8 equivalent, this device supports deterministic port arbitration, hardware semaphore signaling, BUSY flag coordination in master/slave configurations, and low-power standby modes critical for industrial control and telecom data-path buffering.

Technical Context

The 70V09L20PFI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no shared timing constraints between left and right sides. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output) when both ports access identical addresses, with tBDD ≤17 ns propagation delay from write completion to valid read data.

It integrates eight dedicated semaphore latches (addressed by A0–A2) accessible only when CE = VIH and SEM = VIL, enabling token-passing resource locking without software overhead. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (1FFFEh/1FFFFh), supporting event-driven interprocessor communication.

Key Specifications

Pinout & Package

70V09L20PFI8 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 VCC pins require local decoupling; all GND pins must be connected to system ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C3128P-20JCIN, the 70V09L20PFI8 uniquely integrates semaphore latches and push-pull BUSY signaling in a compact 8-bit dual-port package - delivering hardware-enforced concurrency control without external components or timing penalties.

Availability

70V09L20PFI8 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, automotive ADAS, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for 70V09L20PFI8 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 sensor signal conditioning ICs for high-performance computing and communications.

The 70V09L20PFI8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems demanding sub-20 ns latency and hardware arbitration.

FAQ

What is the maximum operating temperature range certified for the 70V09L20PFI8?

The 70V09L20PFI8 is rated for industrial temperature operation from −40°C to +85°C, with all AC and DC specifications guaranteed across this range. This includes the 20 ns maximum access time, 3.3 V ±0.3 V supply tolerance, and full functionality of semaphore, interrupt, and BUSY logic - making it suitable for under-hood automotive, factory floor, and outdoor telecom deployments where thermal stability is critical.

How does the 70V09L20PFI8 handle simultaneous access to the same memory address by both ports?

The 70V09L20PFI8 uses hardware arbitration: when both left and right ports assert valid addresses matching within the same cycle, the BUSY flag (BUSYL or BUSYR) activates to block the later-arriving write. The tBDD parameter (≤17 ns) defines the delay from write completion on one port to valid read data on the other. In master mode (M/S = VIH), BUSY is an output that stalls the contending port; in slave mode (M/S = VIL), it becomes a write-inhibit input.

Can the 70V09L20PFI8 be used without enabling the semaphore or interrupt features?

Yes - the 70V09L20PFI8 operates as a standard dual-port SRAM even when semaphore (SEM) and interrupt (INTL/INTR) functions are unused. Addresses 1FFFEh and 1FFFFh become regular memory locations, and semaphore latches remain unaccessed unless CE = VIH and SEM = VIL. No configuration registers or initialization sequences are required; all features are pin-controlled and default to passive states.

What is the power consumption profile of the 70V09L20PFI8 in active versus standby modes?

In active operation with both ports enabled, the 70V09L20PFI8 draws up to 220 mA (typical 135 mA) at 3.3 V. In full standby (ISB3), with both CE0/CE1 and SEM held at CMOS-inactive levels (>VCC−0.2 V), current drops to 0.2 mA typical (3.0 mA max). Standby current remains stable across temperature, enabling reliable low-power hold states in battery-backed or energy-harvesting systems.

Is the 70V09L20PFI8 pin-compatible with earlier versions like the 70V09L15PFI8?

Yes - the 70V09L20PFI8 shares identical pinout, package (100-pin TQFP), and signal definitions with the 70V09L15PFI8 and other members of the 70V09 family. The only difference is speed grade: 70V09L15PFI8 guarantees 15 ns access (commercial only), while 70V09L20PFI8 guarantees 20 ns access across industrial temperatures. Both support identical voltage, timing, and functional modes - enabling drop-in replacement where 20 ns latency is acceptable.