Renesas 70V28VL15PF

Overview

70V28VL15PF from IDT (Integrated Device Technology) 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/arbiration logic for multi-processor synchronization. It operates in master/slave configuration to support 32-bit+ bus expansion and is used in real-time embedded control systems requiring concurrent memory access without software overhead.

For engineers reviewing the 70V28VL15PF datasheet, 70V28VL15PF pinout, 70V28VL15PF application, or 70V28VL15PF equivalent, key selection criteria include dual-port arbitration timing (tBDD ≤ 15 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore write-to-read latency (tSWRD = 5 ns), and compatibility with 3.3V LVTTL buses in industrial automation and telecom line-card designs.

Technical Context

The 70V28VL15PF implements fully asynchronous dual-port architecture with separate address, data, and control pins per port - enabling simultaneous read/write to any memory location without contention-induced stalls. Its on-chip arbitration logic uses address-match detection and M/S-selectable push-pull BUSY signaling (not open-drain) to gate writes during conflict.

Hardware semaphore functionality is implemented via eight dedicated latches addressed by A0–A2, accessible only when CE = VIH and SEM = VIL, with tSAA ≤ 20 ns and tSOP = 10 ns. Interrupt flags (INTL/INTR) are triggered by writes to fixed addresses FFFE_H (left) and FFFF_H (right), supporting mailbox-style inter-processor communication.

Key Specifications

Pinout & Package

70V28VL15PF 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 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 AS7C364B-15JCIN, the 70V28VL15PF uniquely delivers 3.3V LVTTL dual-port operation with on-chip semaphore and BUSY arbitration - eliminating external glue logic and reducing BOM count in real-time multi-processor systems.

Availability

70V28VL15PF is available at Aetrix Electronics and suitable for industrial PLC backplanes, telecom line cards, automotive ADAS sensor fusion, and medical imaging data pipelines requiring stable component supply and long-term production continuity.

Supply support for 70V28VL15PF 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas in 2019. IDT pioneered high-performance dual-port SRAMs for real-time embedded systems.

The 70V28VL15PF belongs to IDT's 70V28 family of high-speed dual-port SRAMs, designed specifically for multi-processor synchronization in telecom, industrial automation, and test equipment where deterministic latency and hardware-assisted resource sharing are critical.

FAQ

What is the maximum operating frequency supported by the 70V28VL15PF?

The 70V28VL15PF does not operate at a fixed clock frequency but supports asynchronous access with a 15 ns maximum access time (tAA). This enables reliable interfacing with 3.3V LVTTL buses running up to approximately 67 MHz (1/15 ns) in non-pipelined configurations. Actual system throughput depends on bus protocol overhead and arbitration timing - notably tBDD ≤ 15 ns and tSAA ≤ 20 ns - which must be accounted for in timing closure.

How does the M/S pin affect BUSY signal behavior in the 70V28VL15PF?

In the 70V28VL15PF, the M/S pin configures BUSY pin functionality: when M/S = VIH, BUSYL and BUSYR are push-pull outputs that assert when address contention occurs; when M/S = VIL, they become inputs that internally inhibit writes upon assertion. This allows the device to operate as either a master (driving BUSY) or slave (responding to external BUSY), enabling flexible arbitration topologies in cascaded memory arrays.

Can the 70V28VL15PF be used without enabling the semaphore or interrupt features?

Yes - the 70V28VL15PF functions as a standard dual-port SRAM even when semaphores and interrupts are unused. Addresses FFFE_H and FFFF_H default to general-purpose memory locations, and semaphore registers remain inactive unless SEM = VIL and CE = VIH. No configuration registers or initialization sequences are required; all features are pin-controlled and transparent to basic read/write operations.

What is the power consumption profile of the 70V28VL15PF in standby mode?

The 70V28VL15PF offers multiple standby modes: ISB3 (full CMOS standby) draws 0.2 mA typical (3.0 mA max) when both ports have CE > VCC − 0.2 V; ISB1 (TTL standby) consumes 40 mA typical (70 mA max) with CE = VIH. The low ISB3 current makes it suitable for battery-backed or energy-harvesting applications where periodic wake-up polling is employed - with full 15 ns access restored within tPU = 0 ns of CE assertion.

Is the 70V28VL15PF pin-compatible with other members of the IDT70V28 family?

Yes - the 70V28VL15PF shares identical pinout, package (100-pin TQFP), and functional block diagram with other speed grades in the IDT70V28 family (e.g., 70V28L20PF). Differences are limited to AC timing parameters (e.g., tAA = 15 ns vs. 20 ns) and temperature grading (commercial-only vs. industrial). This allows direct replacement in existing layouts when performance or environmental requirements change.