Renesas 70V09L15PFG8

Overview

70V09L15PFG8 from 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), LVTTL-compatible 3.3 V ±0.3 V supply, and integrated hardware semaphore/arbiration logic for inter-processor synchronization in real-time embedded systems.

For engineers reviewing the 70V09L15PFG8 datasheet, 70V09L15PFG8 pinout, 70V09L15PFG8 application, or 70V09L15PFG8 equivalent, key selection criteria include simultaneous port access capability, BUSY-flag arbitration timing (tBAA ≤15 ns), semaphore flag update pulse (tSOP =10 ns), and TQFP-100 packaging for space-constrained industrial control and telecom backplane designs.

Technical Context

The 70V09L15PFG8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port-enabling concurrent read/write to any memory location without internal contention. Its on-chip arbitration logic uses address-match detection and M/S pin configuration to determine BUSY output behavior (push-pull) or BUSY input mode.

Hardware semaphore support operates via dedicated A0–A2-addressed latches (8 flags), accessed using CE=VIH/SEM=VIL, with tSWRD=5 ns write-to-read latency and tSPS=5 ns contention window-ensuring deterministic token-passing between processors without software overhead.

Key Specifications

Pinout & Package

70V09L15PFG8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, 14 mm × 14 mm body size, and exposed thermal pad (not electrically connected). Pin 1 marked by dot; pins arranged in clockwise order from top-left corner.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15ZXC and IDT70V27L15PF, the 70V09L15PFG8 uniquely delivers 128K × 8 density with integrated semaphore/BUSY logic in a 100-pin footprint-making it optimal for space-constrained, real-time inter-processor communication where deterministic arbitration and minimal external components are required.

Availability

70V09L15PFG8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line card control, medical imaging subsystems, and aerospace avionics data loggers requiring stable component supply across extended production lifecycles.

Supply support for 70V09L15PFG8 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 solutions for high-performance computing and communications infrastructure.

The 70V09L15PFG8 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems requiring hardware-accelerated arbitration and semaphore signaling.

FAQ

What is the maximum operating frequency supported by the 70V09L15PFG8?

The 70V09L15PFG8 supports a maximum operating frequency of 66.7 MHz, derived from its 15 ns access time (tAA) and 15 ns read cycle time (tRC). This allows full-speed synchronous operation with microcontrollers and FPGAs running at standard 33–66 MHz bus clocks. The 70V09L15PFG8 maintains this performance across the commercial temperature range (0°C to +70°C) with 3.3 V ±0.3 V supply.

How does the BUSY arbitration logic function in the 70V09L15PFG8?

The 70V09L15PFG8's BUSY arbitration logic detects address matches between left and right ports and asserts BUSYL or BUSYR within 15 ns (tBAA). When configured as master (M/S = VIH), BUSY is a push-pull output that gates writes on the contending port. In slave mode (M/S = VIL), BUSY becomes an input that inhibits writes-enabling hierarchical arbitration in multi-device arrays. The 70V09L15PFG8 requires no external pull-ups due to its totem-pole output structure.

Can the 70V09L15PFG8 be used for semaphore-based resource locking between dissimilar processors?

Yes-the 70V09L15PFG8 includes eight dedicated hardware semaphore flags accessible via A0–A2 addressing and controlled by SEM/CE pins. Each flag supports atomic read-modify-write sequences with 5 ns contention window (tSPS), enabling deterministic token passing between heterogeneous processors (e.g., ARM + DSP, PowerPC + FPGA) without software intervention. The 70V09L15PFG8 semaphore logic operates independently of the main memory array, ensuring isolation and reliability.

What power-saving features does the 70V09L15PFG8 offer?

The 70V09L15PFG8 provides four standby modes: ISB1 (70 mA max, TTL-level CE inactive), ISB2 (155 mA max, one port active), ISB3 (3.0 mA max, full CMOS standby), and ISB4 (150 mA max, one port in CMOS standby). Its automatic power-down is controlled by CE0/CE1 enables-allowing per-port shutdown. Typical active power is 440 mW; standby drops to 660 µW (ISB3), reducing system energy use during idle intervals. The 70V09L15PFG8 achieves this using CMOS high-performance fabrication without compromising speed.

Is the 70V09L15PFG8 pin-compatible with other IDT dual-port SRAMs?

The 70V09L15PFG8 shares the same 100-pin TQFP package and core pinout (CE/R/W/OE/ADDR/I/O) with IDT's 70V27L15PF and 70V35L15PF families, but differs in memory depth (128K×8 vs 64K×16/32K×16) and feature set (e.g., semaphore count, interrupt address mapping). While PCB layout reuse is possible for basic connectivity, full pin compatibility requires verification of BUSY/INT/SEM pin behavior and timing-especially for M/S configuration and interrupt mailbox addresses. The 70V09L15PFG8 is not a drop-in replacement for devices lacking its specific arbitration logic.