Renesas 70V28L20PFG8

Overview

70V28L20PFG8 from IDT (now Renesas) is a high-speed, 3.3V, 64K × 16 true dual-port static RAM with independent left/right ports, 20 ns max access time (industrial & commercial), on-chip semaphore logic, and hardware BUSY arbitration. It enables simultaneous read/write to the same memory location in real-time inter-processor communication systems.

For engineers reviewing the 70V28L20PFG8 datasheet, 70V28L20PFG8 pinout, 70V28L20PFG8 application, or 70V28L20PFG8 equivalent, key selection criteria include dual-port timing symmetry, M/S-configurable BUSY behavior, LVTTL-compatible 3.3V operation, 100-pin TQFP packaging, and integrated semaphore flag support for lock-free resource sharing.

Technical Context

The 70V28L20PFG8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no shared timing constraints between left and right sides. Its on-chip arbitration logic responds to address match events within ≤20 ns (tBAA/tBAC), asserting push-pull BUSY outputs without external pull-ups.

Semaphore functionality operates independently of main memory via dedicated A0–A2 address space and SEM pin control, supporting eight binary flags writable by one port and readable by both. Interrupt generation is triggered by writes to FFFE_H (INTL) or FFFF_H (INTR), with reset via read or write as defined in Truth Table IV.

Key Specifications

Pinout & Package

70V28L20PFG8 is housed in a 100-pin Thin Quad Flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, lead pitch 0.5 mm. All VCC and GND pins must be connected per datasheet Note 1–2.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C364096B-20BIN, the 70V28L20PFG8 uniquely integrates semaphore latches, interrupt flags, and configurable BUSY behavior - reducing BOM count and eliminating timing-critical software arbitration in tightly coupled multi-processor designs.

Availability

70V28L20PFG8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC buffering, and medical imaging data pipelines requiring stable component supply across extended production lifecycles.

Supply support for 70V28L20PFG8 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 70V28L20PFG8 belongs to IDT's legacy high-speed dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor memory sharing in real-time embedded systems where hardware-assisted arbitration is critical.

FAQ

What is the maximum operating temperature range for the 70V28L20PFG8?

The 70V28L20PFG8 is rated for industrial operation from −40°C to +85°C, with all AC and DC specifications guaranteed across this full range - no derating or speed penalty applies at temperature extremes.

Does the 70V28L20PFG8 require external pull-up resistors on BUSY pins?

No. The 70V28L20PFG8 features push-pull BUSY outputs in Master mode (M/S = VIH), eliminating the need for external pull-up resistors. In Slave mode (M/S = VIL), BUSY pins function as inputs and remain high-impedance.

How many semaphore flags does the 70V28L20PFG8 support, and how are they accessed?

The 70V28L20PFG8 supports eight independent binary semaphore flags, addressed via A0–A2 and controlled by the SEM pin. When SEM = VIL, writes to I/O0 set the flag state; all I/O lines reflect the current value during reads.

Can the 70V28L20PFG8 be used in a 32-bit data path configuration?

Yes. Using the MASTER/SLAVE cascading method with the M/S pin, multiple 70V28L20PFG8 devices can be combined to form a 32-bit or wider word memory system - with full-speed operation and no external logic required.

What is the standby current consumption of the 70V28L20PFG8 in full CMOS standby mode?

In full standby mode (ISB3), where all inputs are held at CMOS levels (>VCC−0.2V or <0.2V), the 70V28L20PFG8 consumes only 0.2 mA typical - enabling ultra-low-power operation in battery-backed or energy-sensitive systems.