Renesas 70V09L20PFGI8

Overview

70V09L20PFGI8 from Integrated Device Technology is a high-speed 128K × 8 true dual-ported static RAM with independent left/right ports, 20 ns maximum access time (industrial grade), LVTTL-compatible 3.3 V ±0.3 V 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 70V09L20PFGI8 datasheet, 70V09L20PFGI8 pinout, 70V09L20PFGI8 application, or 70V09L20PFGI8 equivalent, key selection considerations include dual-port contention resolution via BUSY flag timing (tBAA ≤ 20 ns), semaphore write-to-read latency (tSWRD = 5 ns), interrupt mailbox addressing (1FFFE/1FFFF hex), and TQFP-100 industrial temperature support (–40°C to +85°C).

Technical Context

The 70V09L20PFGI8 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 handles port-to-port conflicts via push-pull BUSY outputs (not open-drain) and supports both master (M/S = VIH) and slave (M/S = VIL) configurations for array expansion.

It integrates three coexisting hardware coordination mechanisms: (1) BUSY-flag arbitration for memory location contention, (2) eight binary semaphore latches (addressed by A0–A2) accessible via dedicated SEM/R/W control, and (3) interrupt flags (INTL/INTR) triggered by writes to fixed mailbox addresses (1FFFE/1FFFF). All operate independently of core SRAM access cycles.

Key Specifications

Pinout & Package

70V09L20PFGI8 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 and GND pins must be connected per datasheet layout guidelines; NC pins are no-connect and must remain unconnected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C3128B-20JIN, the 70V09L20PFGI8 uniquely delivers integrated hardware arbitration (BUSY/SEM/INT) in a 128K × 8 configuration - enabling deterministic, low-latency interprocessor communication without external components or software overhead.

Availability

70V09L20PFGI8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, industrial motion control, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V09L20PFGI8 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 solutions for high-performance computing and communications systems.

The 70V09L20PFGI8 belongs to IDT's high-speed dual-port SRAM product line, designed specifically for deterministic interprocessor communication in industrial, aerospace, and medical systems requiring hardware-accelerated resource arbitration.

FAQ

What is the operating temperature range certified for the 70V09L20PFGI8?

The 70V09L20PFGI8 is specified for industrial temperature operation from –40°C to +85°C across all electrical parameters including 20 ns access time, BUSY timing (tBAA ≤ 20 ns), and power consumption. This rating is validated per datasheet Table 10 and applies to the PFGI8 package variant.

How does the BUSY arbitration logic function in master versus slave configuration on the 70V09L20PFGI8?

In master mode (M/S = VIH), BUSYL and BUSYR are push-pull outputs indicating port-to-port address contention; in slave mode (M/S = VIL), they become inputs that internally inhibit writes when driven low. The 70V09L20PFGI8 uses this dual-role capability to enable scalable width expansion with one master managing BUSY arbitration for multiple slaves.

Can the 70V09L20PFGI8 support simultaneous read and write to the same memory address without data corruption?

Yes - the 70V09L20PFGI8's true dual-port architecture allows simultaneous read and write to the same address. When contention occurs, BUSY logic asserts within 20 ns (tBAA) to stall the later access, while the earlier access proceeds. No external logic is needed to prevent corruption, as the on-chip arbitration enforces atomicity.

What are the exact memory addresses used for interrupt mailbox functionality in the 70V09L20PFGI8?

The 70V09L20PFGI8 uses fixed hexadecimal addresses for interrupt mailbox operation: writing to address 1FFFE (hex) asserts the left-port interrupt flag (INTL), and writing to address 1FFFF (hex) asserts the right-port flag (INTR). These locations are standard across all 70V09 variants and are documented in Truth Table IV of the datasheet.

Does the 70V09L20PFGI8 require external pull-up resistors on BUSY or interrupt pins?

No - the 70V09L20PFGI8 features push-pull (totem-pole) outputs for BUSYL, BUSYR, INTL, and INTR, eliminating the need for external pull-up resistors. This is explicitly stated in datasheet Note 2 of the Functional Block Diagram and confirmed in the Absolute Maximum Ratings table.