Renesas 7009L15PFG

Overview

7009L15PFG from IDT 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/INT/BUSY arbitration logic. It enables simultaneous read/write to same memory location and supports master/slave cascading for 16-bit+ bus expansion in real-time embedded multiprocessor systems.

For engineers reviewing the 7009L15PFG datasheet, 7009L15PFG pinout, 7009L15PFG application, or 7009L15PFG equivalent, this page delivers verified timing specs (tAA = 15 ns, tRC = 15 ns), dual-port arbitration behavior (M/S-controlled BUSY directionality), semiconductor-grade thermal range (0°C to +70°C), and exact TQFP-100 mechanical mapping - all confirmed against IDT's official 7009L specification rev. Jan.12.22.

Technical Context

The 7009L15PFG implements fully asynchronous dual-port operation with separate address/control/I/O buses per port, enabling concurrent access without cycle penalty. Its on-chip arbitration logic resolves contention via push-pull BUSY flags (not open-drain) and supports both master (BUSY output) and slave (BUSY input) modes via the M/S pin.

Hardware semaphore functionality uses dedicated A0–A2-addressed latches (8 flags) accessible only when CE = VIH and SEM = VIL, while full 128K × 8 RAM access requires CE = VIL and SEM = VIH. Interrupt flags (INTL/INTR) are triggered by writes to fixed mailbox addresses (1FFFEh/1FFFFh), with reset via read/write as defined in Truth Table IV.

Key Specifications

Pinout & Package

7009L15PFG 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 located at top-left corner (marking dot), pin numbering clockwise.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C3128A-15JCIN, the 7009L15PFG uniquely integrates push-pull BUSY arbitration, mailbox interrupts, and eight hardware semaphores in a 5 V, 100-pin TQFP - enabling deterministic, low-latency multiprocessor communication without external glue logic.

Availability

7009L15PFG is available at Aetrix Electronics and suitable for real-time multiprocessor communication, digital signal processing co-processing, industrial PLC redundancy handshaking, and avionics health monitoring systems requiring stable component supply and guaranteed long-term sourcing.

Supply support for 7009L15PFG 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 interface solutions for communications, computing, and industrial markets.

The 7009L product line delivers true dual-port SRAMs with integrated arbitration logic for deterministic multiprocessor systems, targeting applications demanding zero-wait-state shared memory and hardware-enforced resource locking.

FAQ

What is the maximum operating frequency supported by the 7009L15PFG?

The 7009L15PFG does not operate on a clock signal - it is an asynchronous SRAM. Its maximum effective throughput is governed by tRC = 15 ns, supporting up to 66.7 MHz sustained read/write cycles per port. This assumes proper setup/hold timing compliance (e.g., tAS = 0 ns, tDH = 0 ns) and valid CE/OE/R/W assertion. The 7009L15PFG achieves this performance at 0°C to +70°C with 5.0 V ±10% supply.

How does the M/S pin affect BUSY pin functionality in the 7009L15PFG?

When M/S = VIH, the 7009L15PFG operates as a master: BUSYL and BUSYR become push-pull outputs that assert LOW during port-to-port address contention. When M/S = VIL, it operates as a slave: BUSYL and BUSYR become inputs that internally inhibit writes when driven LOW. This dual-mode behavior enables scalable width expansion - one master drives BUSY signals to multiple slaves, as documented in Figure 3 of the IDT 7009L datasheet rev. Jan.12.22.

Can the 7009L15PFG support simultaneous read operations from both ports to the same memory address?

Yes, the 7009L15PFG supports true simultaneous reads from both ports to the same memory location without contention or delay. Its true dual-port SRAM cell architecture allows independent access paths, and BUSY logic is not activated during read/read collisions. This capability is explicitly stated in the Features section ("True Dual-Ported memory cells which allow simultaneous reads of the same memory location") and confirmed in Truth Table II of the 7009L datasheet.

What are the fixed memory addresses used for interrupt flag generation in the 7009L15PFG?

The 7009L15PFG uses two fixed 16-bit addresses for interrupt flag control: 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). Clearing is performed by reading those same addresses - e.g., reading 1FFFEh clears INTL. These mailbox locations are part of the main 128K × 8 array and retain user-defined data, as specified in Truth Table IV and Functional Description section of the IDT 7009L datasheet.

Does the 7009L15PFG require external pull-up resistors on BUSY or INT pins?

No, the 7009L15PFG does not require external pull-up resistors on BUSY or INT pins. BUSY outputs are push-pull (totem-pole) in master mode, and INTL/INTR are non-tri-state totem-pole outputs per datasheet Note 2. This eliminates external components and ensures clean signal edges. However, if interfacing with open-collector systems, verify voltage compatibility - the 7009L15PFG's VOH = 2.4 V min and VOL = 0.4 V max under 4 mA load, per DC Electrical Characteristics Table 9.