Renesas 70V28L15PF8/2703

Overview

70V28L15PF8/2703 from Integrated Device Technology is a high-speed 3.3V 64K × 16 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/arbiter logic for inter-processor synchronization in real-time embedded systems.

For engineers reviewing the 70V28L15PF8/2703 datasheet, 70V28L15PF8/2703 pinout, 70V28L15PF8/2703 application, or 70V28L15PF8/2703 equivalent, this device supports simultaneous asynchronous read/write to shared memory locations, hardware BUSY arbitration, master/slave cascading for 32-bit+ data buses, and interrupt-driven mailbox communication between co-processors.

Technical Context

The 70V28L15PF8/2703 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port-enabling concurrent access without internal clocking. Its on-chip arbitration logic resolves contention via push-pull BUSY flags (BUSYL/BUSYR) that gate writes when address matches occur across ports.

It integrates eight dedicated semaphore latches (addressed by A0–A2) accessible via SEM enable, supporting token-passing protocols without software overhead; interrupt flags (INTL/INTR) are triggered by writes to fixed addresses FFFE_H (left) and FFFF_H (right), enabling mailbox-style inter-processor signaling.

Key Specifications

Pinout & Package

70V28L15PF8/2703 is housed in a 100-pin TQFP (PNG100) package with 0.5 mm lead pitch and 14 mm × 14 mm footprint. 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-15ZXI and IDT70V36S15PF8, the 70V28L15PF8/2703 offers optimal balance of LVTTL compatibility, integrated semaphores, and minimal board-level complexity for 16-bit dual-processor systems operating within commercial temperature limits.

Availability

70V28L15PF8/2703 is available at Aetrix Electronics and suitable for real-time industrial PLCs, dual-core DSP communication buffers, automotive ADAS sensor fusion hubs, and medical imaging data pipelines requiring stable component supply and guaranteed commercial-grade performance.

Supply support for 70V28L15PF8/2703 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V28L15PF8/2703 belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in tightly coupled embedded systems where latency, reliability, and hardware-assisted synchronization are critical.

FAQ

What is the maximum operating temperature range supported by the 70V28L15PF8/2703?

The 70V28L15PF8/2703 is specified for commercial temperature operation only: 0°C to +70°C. It is not rated for industrial −40°C to +85°C use. This is confirmed by the "70V28L15" speed grade designation and absence of industrial-grade markings in the ordering information. For extended temperature applications, consider the 70V28L20 variant instead.

Does the 70V28L15PF8/2703 support true simultaneous read/write to the same memory address?

Yes - the 70V28L15PF8/2703 uses true dual-ported SRAM cells that permit concurrent access to identical addresses. When both ports attempt a write or mixed read/write to the same location, hardware BUSY arbitration activates: one port proceeds while the other receives BUSY assertion, preventing data corruption. This behavior is intrinsic to the cell architecture and requires no external logic.

How are the semaphore flags accessed on the 70V28L15PF8/2703?

Semaphore flags are accessed by asserting SEM = VIL and CE = VIH (per Truth Table III), then using A0–A2 to select one of eight latches. I/O0 carries the write value; all I/O lines (I/O0–I/O15) reflect the current latch state during reads. The 70V28L15PF8/2703 dedicates no physical memory space to semaphores - they reside in separate hardware latches decoupled from the main 64K×16 array.

Can the 70V28L15PF8/2703 be used in a master/slave configuration for 32-bit data width expansion?

Yes - the 70V28L15PF8/2703 supports master/slave cascading via the M/S pin and BUSY chaining. When configured as master (M/S = VIH), BUSY outputs drive slaves' BUSY inputs, enabling automatic depth expansion. Two devices yield 64K×32 capacity with full-speed operation and no external logic, as documented in the functional description and pin configuration diagrams.

What is the function of the INTL and INTR pins on the 70V28L15PF8/2703?

INTL and INTR are push-pull interrupt flags: INTL asserts when the right port writes to address FFFE_H; INTR asserts when the left port writes to FFFF_H. These serve as mailbox triggers - the written 16-bit value becomes the message payload. Both flags are initialized at power-up and require no external pull-ups. Their behavior is defined in Truth Table IV and functional description section.