Renesas 70V27L15PFG

Overview

70V27L15PFG from Integrated Device Technology is a high-speed 32K × 16 dual-port static RAM with true simultaneous access to the same memory location from independent left and right ports, 15 ns maximum read cycle time (tRC), 3.3 V ±0.3 V single-supply operation, and industrial temperature range (–40°C to +85°C). It enables error-free 32-bit+ bus expansion via Master/Slave cascading in real-time control and communication subsystems.

For engineers reviewing the 70V27L15PFG datasheet, 70V27L15PFG pinout, 70V27L15PFG application, or 70V27L15PFG equivalent, this page delivers verified timing parameters, port arbitration behavior, semaphore signaling capability, BUSY/INT flag timing, and TQFP-100 package interface details required for deterministic dual-processor memory sharing designs.

Technical Context

The 70V27L15PFG implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent read/write operations without internal contention. Its on-chip arbitration logic resolves port conflicts via address-match or chip-enable priority, with programmable BUSY assertion (M/S = VIH) or BUSY input (M/S = VIL) modes.

It integrates full hardware semaphore support across eight flags addressed by A0–A2, with dedicated SEM pins and non-tri-state totem-pole INT/BUSY outputs. Power management uses TTL- and CMOS-level CE0/CE1 enables to achieve 660 µW typical standby current in full CMOS inactive mode (ISB3).

Key Specifications

Pinout & Package

70V27L15PFG is housed in a 100-pin TQFP (PN100-1) with 0.5 mm pitch, 14 mm × 14 mm footprint, and exposed thermal pad (not electrically connected). All VDD pins require local 3.3 V decoupling; all VSS pins must be solidly grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-15AXC and R1EX24032ASAS-15, the 70V27L15PFG uniquely integrates full semaphore registers, push-pull BUSY/INT outputs, and M/S-configurable cascading-enabling drop-in replacement in safety-critical industrial and aerospace systems without redesigning arbitration or timing margins.

Availability

70V27L15PFG is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, and medical imaging frame buffers requiring stable component supply, long-term lifecycle assurance, and guaranteed industrial temperature qualification.

Supply support for 70V27L15PFG 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 power solutions for high-performance computing and communications infrastructure.

The IDT70V27 family was designed specifically for deterministic dual-processor memory sharing in real-time control systems, emphasizing hardware arbitration, low-latency semaphore signaling, and industrial-grade reliability without external logic.

FAQ

What is the maximum operating frequency supported by the 70V27L15PFG?

The 70V27L15PFG does not operate at a fixed clock frequency but supports asynchronous operation with a 15 ns maximum read cycle time (tRC). This enables effective data throughput up to 66.7 MHz in continuous burst mode. Actual system bandwidth depends on address/control setup times and bus turnaround; the 70V27L15PFG achieves full performance without external clocks or PLLs.

How does the 70V27L15PFG handle simultaneous access to the same memory address from both ports?

The 70V27L15PFG resolves simultaneous access via on-chip arbitration logic that asserts BUSY on the later-arriving port. When M/S = VIH (Master), BUSY is an output that blocks writes; when M/S = VIL (Slave), BUSY is an input that inhibits internal writes. Address-match arbitration ensures deterministic priority with tAPS = 5 ns setup guarantee.

Can the 70V27L15PFG be used in a Master/Slave configuration with more than two devices?

Yes - the 70V27L15PFG supports cascaded Master/Slave topologies using the M/S pin and BUSY flag chaining. One device is configured as Master (M/S = VIH), others as Slaves (M/S = VIL), with BUSY outputs feeding BUSY inputs across the chain. This enables seamless 32-bit or wider word expansion without additional discrete logic or PCB layout changes.

What is the purpose of the SEM pins on the 70V27L15PFG?

The SEML and SEMR pins enable hardware semaphore register access instead of RAM. When SEM = VIL and CE = VIH, the device routes A0–A2 to eight dedicated semaphore flags (addressed 0–7), allowing atomic set/clear operations via I/O0. This provides lock-free inter-processor synchronization without memory-mapped register overhead or software intervention.

Does the 70V27L15PFG support partial-byte writes, and how is this implemented?

Yes - the 70V27L15PFG supports upper- and lower-byte writes via dedicated UBL/LBL and UBR/LBR pins. Setting UBL = LBL = VIH disables both bytes; UBL = VIL + LBL = VIH writes only I/O8–I/O15; UBL = VIH + LBL = VIL writes only I/O0–I/O7. This enables precise 8-bit peripheral interfacing without masking logic or wasted bandwidth.