Renesas 70V28VL15PF8

Overview

70V28VL15PF8 from Integrated Device Technology (IDT) 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 multiprocessor synchronization. It enables simultaneous read/write to the same memory location in systems requiring deterministic inter-processor communication - such as real-time industrial controllers and embedded DSP co-processing subsystems.

For engineers reviewing the 70V28VL15PF8 datasheet, 70V28VL15PF8 pinout, 70V28VL15PF8 application, or 70V28VL15PF8 equivalent, key selection considerations include its dual-chip-enable depth expansion capability, M/S-configurable BUSY arbitration mode, 100-pin TQFP package with separate upper/lower byte controls, and support for semaphore-based resource locking without software overhead.

Technical Context

The 70V28VL15PF8 implements fully asynchronous dual-port architecture with independent address, control, and data buses per port - enabling concurrent access without internal wait states. Its on-chip arbitration logic resolves contention via push-pull BUSY flags (active-high, non-tri-state), while semaphore registers (8 latches, addressed by A0–A2) provide hardware-assisted token passing between ports.

It supports three operational modes: Master (M/S = VIH, BUSY outputs), Slave (M/S = VIL, BUSY inputs), and standalone (no arbitration). Power management includes four standby current modes (ISB1–ISB4), triggered by TTL- or CMOS-level chip enable states on either port, with typical active power of 440 mW at 3.3 V.

Key Specifications

Pinout & Package

70V28VL15PF8 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 externally decoupled; NC pins are not internally connected.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-15ZXI and IDT70V36S15PF8, the 70V28VL15PF8 uniquely integrates hardware semaphore latches and configurable BUSY arbitration in a 64K × 16 footprint - delivering lower system-level latency and reduced BOM count for tightly coupled multiprocessor designs.

Availability

70V28VL15PF8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, DSP-FPGA co-processing subsystems, and medical imaging frame buffers requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V28VL15PF8 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 Electronics in 2019. IDT pioneered high-performance dual-port SRAM architectures for real-time embedded systems.

The 70V28VL15PF8 belongs to IDT's 70Vxx family of high-speed 3.3V dual-port SRAMs, designed specifically for deterministic inter-processor communication in industrial control, test equipment, and digital signal processing applications where hardware arbitration eliminates software-induced jitter.

FAQ

What is the maximum operating frequency supported by the 70V28VL15PF8?

The 70V28VL15PF8 has a 15 ns maximum access time, supporting up to 67 MHz operation (1/15 ns ≈ 66.7 MHz) in commercial temperature range. This applies to both ports independently - no derating is needed for simultaneous access. The device does not specify a clock input; timing is asynchronous and governed by tRC (read cycle time) and tWC (write cycle time), both rated at 15 ns max.

How does the M/S pin affect BUSY functionality in the 70V28VL15PF8?

When M/S = VIH, the 70V28VL15PF8 operates as a Master: BUSYL and BUSYR are push-pull outputs that assert HIGH when port contention occurs, gating writes automatically. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that must be driven HIGH externally to enable writes - allowing hierarchical arbitration in multi-device arrays. The 70V28VL15PF8 datasheet confirms both modes are fully supported without configuration registers.

Can the 70V28VL15PF8 be used for depth expansion, and how is it implemented?

Yes - the 70V28VL15PF8 supports depth expansion using dual chip enables (CE0L/CE1L and CE0R/CE1R). By tying CE0 of one device to CE1 of the next, and routing address MSBs to decode logic, designers can cascade multiple 70V28VL15PF8 units to build larger memory maps (e.g., 128K × 16) without external gating logic. The datasheet explicitly states "Dual chip enables allow for depth expansion without external logic" and shows cascading examples in the functional description.

What are the voltage levels and drive strength for the 70V28VL15PF8 I/O pins?

The 70V28VL15PF8 features LVTTL-compatible I/O with VOH ≥ 2.4 V (IOH = –4 mA) and VOL ≤ 0.4 V (IOL = +4 mA) at VCC = 3.3 V. Input thresholds are VIH ≥ 2.0 V and VIL ≤ 0.8 V. These values are specified in the DC Electrical Characteristics table (4849 tbl 09) and confirmed across commercial temperature range. No level-shifting circuitry is required when interfacing with standard 3.3 V LVTTL controllers.

How are interrupt flags (INTL/INTR) configured and cleared in the 70V28VL15PF8?

INTL asserts when the right port writes to address FFFEh; INTR asserts when the left port writes to FFFFh. To clear INTL, the left port reads FFFEh with CEL = OEL = VIL; to clear INTR, the right port reads FFFFh with CER = OER = VIL. These operations are defined in Truth Table IV (4849 tbl 16) and require no initialization beyond power-on reset - the flags remain latched until explicitly cleared via these address-specific accesses.