Renesas 70V28L20PFGI

Overview

70V28L20PFGI from Integrated Device Technology 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), LVTTL-compatible I/O, and on-chip semaphore/arbiration logic for multiprocessor synchronization. It operates across –40°C to +85°C and supports master/slave cascading for 32-bit+ bus expansion in real-time control systems.

For engineers reviewing the 70V28L20PFGI datasheet, 70V28L20PFGI pinout, 70V28L20PFGI application, or 70V28L20PFGI equivalent, key selection criteria include simultaneous port access timing, BUSY/INT flag behavior under contention, semaphore address mapping (A0–A2), CE-controlled power-down current (ISB1 ≤ 55 mA), and TQFP-100 mechanical compatibility with industrial PCB layouts.

Technical Context

The 70V28L20PFGI implements fully asynchronous dual-port architecture with separate address, data, and control buses per port-no shared timing constraints between left (L) and right (R) sides. Its arbitration logic asserts BUSY flags based solely on address match detection (tBAA ≤ 20 ns), independent of R/W state, and supports both master (push-pull BUSY output) and slave (BUSY input) modes via M/S pin configuration.

On-chip semaphore functionality uses dedicated 8-bit latch array addressed by A0–A2 and accessed via SEM = VIL with CE = VIH; semaphore read/write timing (tSAA ≤ 20 ns, tSOP = 10 ns) is decoupled from main memory access. Interrupt flags (INTL/INTR) are software-triggered by writes to fixed addresses FFFE_H (left sets right INT) and FFFF_H (right sets left INT), with reset via read access.

Key Specifications

Pinout & Package

70V28L20PFGI 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 Note 1–2; NC pins are internally unused 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 CY7C1362BV33-200BZXI and AS7C362000B-20JIN, the 70V28L20PFGI uniquely integrates hardware semaphore and BUSY arbitration in a 20 ns 64K×16 dual-port package-enabling deterministic, low-latency interprocessor communication without external logic or firmware overhead.

Availability

70V28L20PFGI is available at Aetrix Electronics and suitable for real-time multiprocessor control, telecom line card buffering, automotive ADAS sensor fusion hubs, and automated test equipment requiring stable component supply across industrial temperature ranges and long production lifecycles.

Supply support for 70V28L20PFGI 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 70V28L20PFGI belongs to IDT's legacy high-speed dual-port SRAM product line, engineered specifically for deterministic interprocessor communication in real-time embedded systems requiring hardware-enforced resource arbitration.

FAQ

What is the maximum operating temperature range for the 70V28L20PFGI?

The 70V28L20PFGI is rated for industrial operation from –40°C to +85°C. This specification is guaranteed across all AC and DC parameters including 20 ns access time, BUSY arbitration timing (tBAA ≤ 20 ns), and standby current (ISB1 ≤ 55 mA). The device uses standard CMOS process technology optimized for stability across this full range without derating.

How does the BUSY signal behave when the 70V28L20PFGI is configured as a slave?

When M/S = VIL, the 70V28L20PFGI operates in slave mode: BUSYL and BUSYR become dedicated write-inhibit inputs. A LOW on either BUSY pin blocks writes to the corresponding port regardless of R/WL/R/WR state. This allows external arbitration logic to directly control port access without modifying internal timing - a key feature for custom master-slave arrays.

Can the 70V28L20PFGI support 32-bit data bus width without external logic?

Yes - the 70V28L20PFGI supports 32-bit expansion via its MASTER/SLAVE architecture. By connecting two devices with M/S pins tied appropriately and cascading CE0/CE1 enables, the system achieves full 32-bit word access with synchronized timing. No glue logic is required because the internal arbitration and semaphore logic scale transparently across the pair.

What addresses trigger the interrupt flags INTL and INTR on the 70V28L20PFGI?

INTL is asserted when the right port writes to address FFFE_H (with CER = R/WR = VIL); INTR is asserted when the left port writes to FFFF_H. Both flags are cleared by reading their respective trigger addresses (FFFE_H for INTL, FFFF_H for INTR) with OE enabled. These locations function as user-defined mailboxes when interrupts are active.

Is the 70V28L20PFGI pin-compatible with earlier IDT70V28 variants like 70V28L15?

Yes - the 70V28L20PFGI shares identical pinout, package (100-pin TQFP), and functional block diagram with all IDT70V28L family members including 70V28L15. The only difference is speed grade: 70V28L20PFGI guarantees 20 ns access across industrial temperature, while 70V28L15 is commercial-only (15 ns, 0°C to +70°C). All control, address, and I/O signals map one-to-one.