Renesas 70V27L35PFI

Overview

70V27L35PFI from Integrated Device Technology is a high-speed 3.3V 32K × 16 dual-port static RAM with true dual-ported memory cells enabling simultaneous access to the same address, 35ns max read cycle time (tRC), 660μW typical standby power, and industrial temperature range (−40°C to +85°C). It serves as a stand-alone or master/slave-expanded memory in real-time embedded systems requiring deterministic inter-processor communication.

For engineers reviewing the 70V27L35PFI datasheet, 70V27L35PFI pinout, 70V27L35PFI application, or 70V27L35PFI equivalent, key selection criteria include port arbitration timing (tAPS = 5ns), BUSY flag behavior under M/S = VIH/VIL configuration, semaphore flag update pulse (tSOP = 15ns), and LVTTL-compatible 3.3V ±0.3V single-supply operation.

Technical Context

The 70V27L35PFI implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - no clock required. On-chip arbitration logic resolves contention via address-match or chip-enable priority, with BUSY outputs (push-pull, non-tri-state) asserting within 35ns (tBAA) when conflict occurs.

It supports semaphore signaling across ports using dedicated SEM pins and A0–A2-addressed flags, with tSWRD = 5ns write-to-read latency and tSPS = 5ns contention window. The device uses CMOS high-performance fabrication and features separate upper/lower byte enables (UB/LB) for flexible bus matching in 32-bit+ systems.

Key Specifications

Pinout & Package

70V27L35PFI 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 VDD and VSS pins must be connected per layout guidelines; 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 CY7C028V-35AXC, 70V27L35PFI delivers integrated semaphore and BUSY arbitration - reducing BOM count and firmware overhead. Against IDT70V35L35PF, it trades capacity for cost and footprint efficiency in fixed 512 Kbit applications.

Availability

70V27L35PFI is available at Aetrix Electronics and suitable for industrial automation, avionics data concentrators, and medical imaging systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V27L35PFI 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 IDT70V27 family was engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, semaphore support, and industrial reliability over general-purpose SRAM use cases.

FAQ

What is the maximum operating frequency supported by the 70V27L35PFI?

The 70V27L35PFI supports a maximum sustained read frequency of 28.6 MHz, derived from its 35 ns read cycle time (tRC). This is the guaranteed maximum rate for consecutive read operations with proper address and control timing margins. Write cycles follow the same 35 ns tWC specification, and the device operates fully asynchronously - no clock signal is required or used internally.

How does the BUSY arbitration mechanism work in the 70V27L35PFI?

In the 70V27L35PFI, BUSY arbitration activates when both ports attempt simultaneous access to the same memory location. With M/S = VIH (Master), BUSYL/BUSYR become push-pull outputs asserting within 35 ns (tBAA) to block the later-arriving write. With M/S = VIL (Slave), BUSY pins serve as inputs that inhibit local writes when driven low by the master port - enabling hierarchical, hardware-managed resource sharing.

Can the 70V27L35PFI be used in a 32-bit data bus configuration?

Yes - the 70V27L35PFI supports 32-bit expansion via its Master/Slave cascading architecture. When two devices are connected with M/S = VIH (Master) and M/S = VIL (Slave), the BUSY output of the Master controls the BUSY input of the Slave, allowing coordinated access across 32-bit-wide memory space without external glue logic. The device's separate UBL/LBL enables further simplify byte-lane alignment.

What is the purpose of the SEM pins on the 70V27L35PFI?

The SEML and SEMR pins on the 70V27L35PFI enable hardware semaphore mode: when CE = VIH and SEM = VIL, the device accesses eight dedicated semaphore flags (addressed by A0–A2) instead of main memory. This provides atomic, low-latency inter-port signaling with tSOP = 15 ns update pulse and tSWRD = 5 ns write-to-read latency - critical for lock-free synchronization in real-time systems.

Does the 70V27L35PFI support independent power-down per port?

Yes - the 70V27L35PFI implements per-port power management using CE0 and CE1. When CE0L = VIH and CE1L = VIH, the left port enters full standby consuming only 0.2 mA (ISB3 typ.). The right port can remain active simultaneously. This selective shutdown enables dynamic power optimization in asymmetric processing architectures where one processor sleeps while another remains operational.