Renesas 7009L15PFG8

Overview

7009L15PFG8 from IDT (Integrated Device Technology) is a high-speed 128K × 8 true dual-ported static RAM with independent left/right ports, 15 ns max access time (commercial grade), TTL-compatible 5V ±10% supply, and integrated hardware semaphore/arbiter logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 7009L15PFG8 datasheet, 7009L15PFG8 pinout, 7009L15PFG8 application, or 7009L15PFG8 equivalent, this page delivers verified timing specs, BUSY/INT/SEM behavior, TQFP-100 package mapping, industrial-grade alternatives, and dual-port memory integration guidance for multiprocessor designs requiring deterministic arbitration without software overhead.

Technical Context

The 7009L15PFG8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port - enabling simultaneous reads to the same memory location. Its on-chip arbitration logic uses push-pull BUSY outputs (not open-drain) and supports Master/Slave configuration via the M/S pin to enable depth expansion without external logic.

Hardware semaphore functionality operates across eight dedicated latch locations (A0–A2), accessed via CE = VIH / SEM = VIL, with write-to-I/O0/read-from-all-I/Os protocol. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (1FFFEh/1FFFFh), and all timing parameters - including tBDD (BUSY disable to valid data), tSWRD (semaphore write-to-read), and tAPS (arbitration priority setup) - are specified for 15 ns commercial speed grade.

Key Specifications

Pinout & Package

7009L15PFG8 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 Note 1–2; 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-15ZXI and AS7C3128P-15JCIN, the 7009L15PFG8 uniquely integrates push-pull BUSY arbitration, M/S-selectable operation, and dedicated semaphore latches - delivering deterministic, zero-software-overhead inter-processor communication in a 5 V, 100-pin TQFP package.

Availability

7009L15PFG8 is available at Aetrix Electronics and suitable for industrial PLC control systems, real-time avionics data buffering, medical imaging frame stores, high-speed test equipment FIFOs, and multiprocessor communication interfaces requiring stable component supply and long-term lifecycle support.

Supply support for 7009L15PFG8 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

IDT (Integrated Device Technology) is a fabless semiconductor company specializing in high-performance memory, timing, and interconnect solutions for communications, computing, and industrial markets.

The 7009L15PFG8 belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and mailbox-style interrupts eliminate software synchronization bottlenecks.

FAQ

What is the maximum operating frequency supported by the 7009L15PFG8?

The 7009L15PFG8 does not specify a maximum clock frequency because it is an asynchronous SRAM. Its performance is defined by timing parameters: tRC (read cycle time) and tWC (write cycle time) are both 15 ns maximum. This corresponds to a theoretical maximum sustained throughput of approximately 66.7 million operations per second per port when operating under ideal timing conditions with no wait states.

How does the BUSY arbitration logic function in Master vs. Slave configuration for the 7009L15PFG8?

In Master configuration (M/S = VIH), BUSYL and BUSYR are push-pull outputs that assert LOW when port contention occurs on matching addresses, gating writes on the contending port. In Slave configuration (M/S = VIL), BUSYL and BUSYR become inputs that must be driven LOW to inhibit writes - enabling cascaded width expansion where one master drives BUSY signals to multiple slaves. The 7009L15PFG8's BUSY logic requires no external pull-ups in Master mode due to its totem-pole output structure.

Can the 7009L15PFG8 be used in industrial temperature applications?

No - the 7009L15PFG8 is rated exclusively for commercial temperature range (0°C to +70°C). For industrial applications (–40°C to +85°C), the pin-compatible 7009L20PFG8 variant must be used, which has identical functionality but relaxed 20 ns maximum access time. The "15" in 7009L15PFG8 explicitly denotes the 15 ns speed grade and commercial temperature qualification.

What are the valid address ranges for interrupt mailbox functionality in the 7009L15PFG8?

The 7009L15PFG8 uses two fixed 16-bit addresses for interrupt mailbox operation: writing to address 1FFFEh (hex) asserts the left-port interrupt flag (INTL), and writing to address 1FFFFh (hex) asserts the right-port interrupt flag (INTR). These locations are part of the main 128K memory map and retain full SRAM functionality when interrupts are disabled - no dedicated memory is reserved or lost.

How are the eight semaphore flags accessed and controlled on the 7009L15PFG8?

The 7009L15PFG8's eight semaphore flags reside in dedicated latches addressed by A0–A2. They are accessed only when CE = VIH and SEM = VIL (per Truth Table III). A write to I/O0 sets the selected semaphore; reading any I/O0–I/O7 returns its state. This atomic read-modify-write capability enables token-passing protocols without software locks - the 7009L15PFG8's semaphore logic operates independently of the main RAM array and requires no additional timing margins.