Renesas 70V09L20PFI

Overview

70V09L20PFI 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/INT/BUSY arbitration logic. It enables simultaneous asynchronous read/write to the same memory location in real-time interprocessor communication systems.

For engineers reviewing the 70V09L20PFI datasheet, 70V09L20PFI pinout, 70V09L20PFI application, or 70V09L20PFI equivalent, this device serves as a drop-in-ready dual-port SRAM for deterministic inter-CPU handshaking, mailbox-based messaging, and hardware-coordinated resource sharing in industrial embedded controllers and telecom line cards.

Technical Context

The 70V09L20PFI implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no internal clock required. Its BUSY logic resolves port-to-port contention via address-match arbitration, while semaphore flags (8-bit, accessed via A0–A2) provide hardware-assisted token-passing coordination between processors.

It supports MASTER/SLAVE cascading for 16-bit+ data width expansion using M/S pin configuration; BUSY pins function as push-pull outputs in master mode (M/S = VIH) and as write-inhibit inputs in slave mode (M/S = VIL). All timing parameters - including tAA (20 ns), tBDD (17 ns), and tSWRD (5 ns) - are guaranteed over –40°C to +85°C.

Key Specifications

Pinout & Package

70V09L20PFI is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. Pin 1 is located at top-left corner (marked dot), and all VCC/GND pins must be externally decoupled per datasheet layout guidelines.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and IDT70V25L20PF, the 70V09L20PFI uniquely integrates semaphore latches and MASTER/SLAVE expandability in a thermally optimized TQFP package - delivering hardware-coordinated concurrency without external glue logic or layout compromise.

Availability

70V09L20PFI is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, avionics sensor fusion modules, and medical imaging real-time processing systems requiring stable component supply across extended product lifecycles.

Supply support for 70V09L20PFI 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 high-performance computing solutions.

The 70V09L20PFI belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic interprocessor communication in industrial, telecom, and aerospace systems where hardware arbitration and low-latency memory sharing are critical.

FAQ

What is the guaranteed maximum access time for 70V09L20PFI across its full operating temperature range?

The 70V09L20PFI guarantees a maximum address access time (tAA) of 20 ns over the full industrial temperature range of –40°C to +85°C. This value is production-tested and applies to both left and right ports under VCC = 3.3 V ±0.3 V, ensuring deterministic timing for real-time inter-CPU synchronization in mission-critical systems.

How does the BUSY arbitration logic function in 70V09L20PFI when both ports access the same memory address simultaneously?

When both ports assert valid addresses matching within the same cycle, the 70V09L20PFI's hardware BUSY logic detects the collision and asserts BUSYL or BUSYR (depending on port priority determined by tAPS setup) within 20 ns. The non-winning port's write is internally gated - preventing data corruption - while the winning port completes its access unimpeded. This occurs without software intervention.

Can 70V09L20PFI be used in a 16-bit data path system, and if so, how is width expansion implemented?

Yes - 70V09L20PFI supports 16-bit expansion via MASTER/SLAVE configuration. One device is configured as master (M/S = VIH) to generate BUSY arbitration signals; others operate as slaves (M/S = VIL) using those signals as write-inhibit inputs. No external logic is required, and both 8-bit ports remain fully functional for independent access.

What are the electrical characteristics of the INTL and INTR pins on 70V09L20PFI, and how are they initialized?

The INTL and INTR pins on 70V09L20PFI are push-pull outputs with VOH ≥ 2.4 V (IOH = –4 mA) and VOL ≤ 0.4 V (IOL = +4 mA). They must be initialized at power-up: writing to address 1FFFE (right port) sets INTL; reading 1FFFF (left port) clears INTR. Both flags remain asserted until explicitly reset per Truth Table IV in the datasheet.

Does 70V09L20PFI require external pull-up resistors on BUSY, INT, or SEM pins?

No - all BUSY, INT, and SEM pins on 70V09L20PFI are push-pull (totem-pole) outputs per datasheet Note 2 and Truth Table II. External pull-ups are unnecessary and discouraged, as they may cause excessive current draw or timing skew. Only standard 0.1 µF VCC–GND decoupling near each power pin is required per layout guidelines.