Renesas 70V28VL20PF

Overview

70V28VL20PF from IDT (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, LVTTL-compatible I/O, and integrated hardware semaphore/arbiter logic for inter-processor synchronization in real-time embedded systems.

For engineers reviewing the 70V28VL20PF datasheet, 70V28VL20PF pinout, 70V28VL20PF application, or 70V28VL20PF equivalent, this device supports simultaneous asynchronous read/write to shared memory locations, BUSY-flag arbitration, interrupt signaling via FFFE/FFFF mailbox addresses, and master/slave cascading for 32-bit+ bus expansion - all without external glue logic.

Technical Context

The 70V28VL20PF implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Its on-chip arbitration logic resolves contention via push-pull BUSY outputs (active-high when M/S = VIH) or BUSY inputs (when M/S = VIL), with tBDD ≤ 17 ns propagation delay from write to valid data on the opposing port.

It integrates eight dedicated semaphore latches (addressed by A0–A2) accessible via SEM = VIL, CE = VIH, enabling token-passing resource locking between processors. Interrupt flags (INTL/INTR) are software-triggered by writes to fixed addresses FFFE (left) and FFFF (right), with tINS/tINR ≤ 20 ns timing.

Key Specifications

Pinout & Package

70V28VL20PF 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 layout guidelines; NC pins are internally unused.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-20AXC and AS7C364B-20TIN, the 70V28VL20PF uniquely delivers 3.3 V dual-port operation with integrated hardware arbitration, semaphore latches, and interrupt mailboxes - reducing BOM count, PCB area, and firmware complexity in multi-processor designs.

Availability

70V28VL20PF is available at Aetrix Electronics and suitable for real-time dual-processor communication, high-speed data acquisition buffering, and redundant control system memory requiring stable component supply across extended industrial lifecycles.

Supply support for 70V28VL20PF 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, is a fabless semiconductor company specializing in timing, memory interface, and RF solutions for high-performance computing and communications.

The 70V28VL20PF belongs to IDT's high-speed dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in industrial automation, aerospace avionics, and telecom infrastructure.

FAQ

What is the maximum operating temperature range for the 70V28VL20PF?

The 70V28VL20PF is rated for industrial temperature operation from −40°C to +85°C, with guaranteed 20 ns access time across this full range. This makes it suitable for deployment in demanding environments such as factory-floor controllers, outdoor base stations, and vehicle-mounted systems where thermal stability is critical.

How does the BUSY arbitration logic function in master versus slave mode on the 70V28VL20PF?

In master mode (M/S = VIH), BUSYL and BUSYR are push-pull outputs that assert high when the opposite port accesses the same address, blocking further writes until resolved. In slave mode (M/S = VIL), they become inputs that must be held high for normal operation or pulled low to inhibit writes - enabling hierarchical system-level arbitration without modifying the 70V28VL20PF's internal logic.

Can the 70V28VL20PF be used to build a 32-bit-wide memory system? If so, how?

Yes - the 70V28VL20PF supports 32-bit expansion via its MASTER/SLAVE architecture. By connecting two devices with M/S tied high (master) and low (slave), and cascading CE, R/W, and address lines, the pair forms a seamless 64K × 32 memory with no external logic. The master's BUSY output coordinates arbitration across both devices, preserving timing integrity.

What are the electrical characteristics of the INTL and INTR interrupt outputs on the 70V28VL20PF?

INTL and INTR are push-pull (totem-pole) outputs with VOH ≥ 2.4 V at IOH = −4 mA and VOL ≤ 0.4 V at IOL = +4 mA. They are asserted by opposite-port writes to addresses FFFE (INTL) or FFFF (INTR), with tINS/tINR ≤ 20 ns. No external pull-ups are required, and they drive directly into CMOS or TTL inputs.

Does the 70V28VL20PF support byte-level write control, and how is it implemented?

Yes - the 70V28VL20PF provides independent upper-byte (UB) and lower-byte (LB) write enables per port. When UBL = LOW and LBL = HIGH, only I/O8–I/O15 are written; when UBL = HIGH and LBL = LOW, only I/O0–I/O7 are written. This enables precise 8-bit updates without read-modify-write cycles, essential for mixed-data-width peripheral interfacing.