Renesas 70V28L15PFGI/2703

Overview

70V28L15PFGI/2703 from IDT (now Renesas) is a high-speed 3.3V 64K × 16 true dual-port static RAM with independent left/right ports, 15 ns max access time (commercial grade), LVTTL-compatible I/O, and integrated hardware semaphore/arbiter logic for inter-processor synchronization in real-time embedded systems.

For engineers reviewing the 70V28L15PFGI/2703 datasheet, 70V28L15PFGI/2703 pinout, 70V28L15PFGI/2703 application, or 70V28L15PFGI/2703 equivalent, this device delivers deterministic port-to-port arbitration, BUSY-flag–driven write inhibition, interrupt mailbox addressing (FFFEh/FFFFh), and byte-selectable I/O control-critical for lock-free multi-CPU memory sharing in industrial controllers and telecom line cards.

Technical Context

The 70V28L15PFGI/2703 implements fully asynchronous dual-port operation with separate CE0/CE1, R/W, OE, UB/LB, and SEM controls per port. Its on-chip arbitration logic asserts BUSY when both ports access identical addresses simultaneously, blocking the later write via push-pull output without external pull-ups.

Semaphore functionality uses eight dedicated latches (addressed by A0–A2) accessible only when CE = VIH and SEM = VIL; interrupt flags (INTL/INTR) are set/cleared by writes to FFFEh/FFFFh with specific CE/OE/R/W conditions, enabling mailbox-style inter-processor signaling without software polling overhead.

Key Specifications

Pinout & Package

70V28L15PFGI/2703 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 layout guidelines to ensure signal integrity and thermal stability.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and AS7C364098B-15TIN, the 70V28L15PFGI/2703 uniquely integrates hardware semaphore, BUSY arbitration, and interrupt mailbox logic in a 3.3V dual-port SRAM-enabling deterministic, low-latency inter-processor communication without external logic or software overhead.

Availability

70V28L15PFGI/2703 is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.

Supply support for 70V28L15PFGI/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

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 70V28L15PFGI/2703 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic multi-processor memory sharing in real-time embedded systems where hardware-enforced coherency is critical.

FAQ

What is the maximum operating temperature range certified for 70V28L15PFGI/2703?

The 70V28L15PFGI/2703 is rated for industrial temperature operation from –40°C to +85°C, as confirmed by the /2703 suffix in the ordering code and validated in the Absolute Maximum Ratings table (TBIAS = –55°C to +125°C, operating range specified in Table 3). This makes it suitable for harsh-environment applications like factory automation and outdoor telecom equipment.

Does 70V28L15PFGI/2703 require external pull-up resistors on BUSY or INT pins?

No. The 70V28L15PFGI/2703 features push-pull BUSY outputs (BUSYL/BUSYR) in master mode and open-drain–compatible interrupt outputs (INTL/INTR), eliminating the need for external pull-up resistors on BUSY. INT pins may use pull-ups for noise immunity in noisy environments, but they are not required for basic functionality per datasheet Figure 2 and Truth Table IV notes.

How does the semaphore function work in 70V28L15PFGI/2703, and what address range does it occupy?

The 70V28L15PFGI/2703 implements eight independent binary semaphore latches addressed by A0–A2 (i.e., locations 000–111 binary), accessible only when CE = VIH and SEM = VIL (Truth Table III). These latches operate independently of the main 64K×16 memory array and support token-passing protocols without software intervention or bus contention.

Can 70V28L15PFGI/2703 be used in a master/slave configuration for wider data buses, and how is it implemented?

Yes. The 70V28L15PFGI/2703 supports master/slave cascading via the M/S pin: when configured as master (M/S = VIH), BUSY outputs coordinate arbitration; as slave (M/S = VIL), BUSY inputs accept external arbitration signals. Multiple devices can be stacked to build 32-bit+ word systems using CE0/CE1 and M/S to manage depth and width expansion without external glue logic.

What are the power-down current specifications for 70V28L15PFGI/2703 in full standby mode?

In full standby mode (ISB3), where both ports have CMOS-level inputs (CE > VCC − 0.2 V, SEM > VCC − 0.2 V, VIN < 0.2 V or > VCC − 0.2 V), the 70V28L15PFGI/2703 draws 0.2 mA typical and 3.0 mA maximum current at VCC = 3.3 V, as specified in Table 10. This ultra-low state enables energy-efficient idle operation in battery-backed or thermally constrained systems.