Renesas 70V08L15PFG8

Overview

70V08L15PFG8 from IDT (now Renesas) is a high-speed, 3.3V, 64K × 8 true dual-ported static RAM with independent left/right ports, 15 ns max access time (commercial grade), LVTTL-compatible I/O, and on-chip semaphore/interrupt/arbitration logic. It enables simultaneous read/write to the same memory location in real-time interprocessor communication systems.

For engineers reviewing the 70V08L15PFG8 datasheet, 70V08L15PFG8 pinout, 70V08L15PFG8 application, or 70V08L15PFG8 equivalent, key selection criteria include port arbitration timing (tAPS = 5 ns), BUSY flag behavior (push-pull, M/S-configurable), dual CE support for depth expansion, and industrial-grade availability of compatible speed grades.

Technical Context

The 70V08L15PFG8 implements fully asynchronous dual-port architecture with separate address, control, and data buses per port. Its on-chip arbitration logic resolves contention via hardware BUSY signaling-configured as output (M/S = VIH) or input (M/S = VIL)-and supports priority-based access using tAPS (5 ns setup) and tBDD (17 ns disable-to-valid-data).

It integrates dedicated semaphore registers (8 flags, addressed by A0–A2) accessible when CE = VIH and SEM = VIL, and interrupt flags (INTL/INTR) triggered by writes to FFFE_H (left) or FFFF_H (right), both implemented as standard SRAM locations with user-defined payload.

Key Specifications

Pinout & Package

70V08L15PFG8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch. Pin 1 is located at top-left corner (marked dot); package body measures 14 mm × 14 mm × 1.4 mm. All VDD and VSS pins must be individually 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-15AXC and AS7C364B-15JCIN, the 70V08L15PFG8 uniquely integrates arbitration, semaphore, and interrupt logic in a 64K × 8 footprint - reducing BOM count and PCB area while guaranteeing deterministic timing for real-time interprocessor communication.

Availability

70V08L15PFG8 is available at Aetrix Electronics and suitable for real-time interprocessor communication, digital signal processing subsystems, industrial PLC backplanes, and avionics data concentrators requiring stable component supply and long-term obsolescence management.

Supply support for 70V08L15PFG8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V08L15PFG8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency interprocessor communication in real-time embedded systems where hardware arbitration and semaphore coherency are critical.

FAQ

What is the maximum operating frequency supported by the 70V08L15PFG8?

The 70V08L15PFG8 does not operate at a fixed clock frequency but supports asynchronous operation with a 15 ns maximum access time. This enables effective random-access throughput up to approximately 66.7 MHz (1/15 ns) in systems with optimized bus timing and no wait states. The device has no internal clock; timing is governed entirely by external control signal edges (CE, R/W, OE) and address stability.

How does the M/S pin affect BUSY functionality in the 70V08L15PFG8?

When M/S = VIH, BUSYL and BUSYR function as push-pull outputs that assert during port contention to block conflicting writes. When M/S = VIL, BUSYL and BUSYR become inputs used to receive BUSY signals from a master device - enabling hierarchical arbitration in multi-chip configurations. This dual-role capability is intrinsic to the 70V08L15PFG8's hardware arbitration design.

Can the 70V08L15PFG8 be used in industrial temperature environments?

The 70V08L15PFG8 is specified for commercial temperature range (0°C to +70°C). For industrial operation (–40°C to +85°C), the functionally identical 70V08L20PFGI8 (20 ns access) is the qualified variant. Both share identical pinout, logic, and feature set; only access time and temperature rating differ - making them drop-in replacements in thermally constrained applications.

What is the purpose of the SEM pins on the 70V08L15PFG8?

The SEML and SEMR pins enable access to the on-chip 8-bit semaphore register file. When CE = VIH and SEM = VIL, the device routes I/O0–I/O7 to eight dedicated semaphore flags (addressed by A0–A2), allowing atomic resource locking without software overhead. This hardware semaphore mechanism is a defining feature of the 70V08L15PFG8 and eliminates race conditions in multi-processor systems.

Does the 70V08L15PFG8 support depth expansion, and how is it implemented?

Yes, the 70V08L15PFG8 supports depth expansion using its dual chip-enable inputs (CE0 and CE1) per port. By tying CE0L/CE1L to one address decode and CE0R/CE1R to another, multiple devices can be stacked to increase memory depth without external logic. This capability is explicitly documented in the datasheet and is a core architectural feature of the 70V08L15PFG8.