Renesas 70V27L35PFI8

Overview

70V27L35PFI8 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 maximum read cycle time, industrial temperature range (−40°C to +85°C), and on-chip semaphore/arbiration logic for inter-processor communication in real-time embedded systems.

For engineers reviewing the 70V27L35PFI8 datasheet, 70V27L35PFI8 pinout, 70V27L35PFI8 application, or 70V27L35PFI8 equivalent, key selection considerations include BUSY flag arbitration timing (tBDD ≤ 40ns), low standby current (ISB3 = 0.2mA typ.), LVTTL-compatible 3.3V operation, and TQFP-100 packaging for space-constrained industrial control and telecom line-card designs.

Technical Context

The 70V27L35PFI8 implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses - supporting concurrent read/write operations without external arbitration logic. Its on-chip port arbitration uses address-match and chip-enable priority detection to assert BUSY flags, while semaphore logic enables eight hardware-mapped synchronization flags accessed via A0–A2.

It features separate upper-byte (UB) and lower-byte (LB) controls for flexible bus-width matching, master/slave configuration via M/S pin to support cascaded 32-bit+ memory expansion, and automatic power-down controlled by CE0/CE1 enabling ultra-low ISB3 standby current (0.2mA typ.) under CMOS-level inactive conditions.

Key Specifications

Pinout & Package

70V27L35PFI8 is housed in a 100-pin TQFP (PN100-1) package with 0.5mm pitch, 14mm × 14mm footprint, and 1.4mm max height. All VDD pins require local 3.3V decoupling; all VSS pins must be connected to solid ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C028V-35AXC and R1EX24032AS0I-35, the 70V27L35PFI8 uniquely integrates master/slave arbitration, hardware semaphores, and LVTTL compliance - making it the sole option for new designs requiring deterministic, low-latency inter-processor synchronization without external components.

Availability

70V27L35PFI8 is available at Aetrix Electronics and suitable for industrial motion control, telecom line cards, avionics data concentrators, and railway signaling units requiring stable component supply across extended product lifecycles.

Supply support for 70V27L35PFI8 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, RF, and sensor signal conditioning ICs for communications, computing, and industrial markets.

The IDT70V27 family was designed specifically for real-time embedded systems requiring deterministic, low-latency inter-processor communication - delivering hardware-accelerated arbitration and synchronization in a single 3.3V SRAM device.

FAQ

What is the maximum operating frequency supported by the 70V27L35PFI8?

The 70V27L35PFI8 does not specify a clock frequency but supports a maximum read cycle time (tRC) of 35ns, enabling sustained operation up to approximately 28.6 MHz per port under ideal conditions. Actual system throughput depends on address/control setup/hold timing and bus loading - verified AC characteristics assume 30pF load and 3ns input rise/fall times per the datasheet test conditions.

Does the 70V27L35PFI8 support true simultaneous read-write to the same memory location?

Yes, the 70V27L35PFI8 features true dual-ported memory cells that allow simultaneous access to the same address - one port may read while the other writes. However, when both ports attempt writes to the same location, on-chip arbitration asserts BUSY to block the later request, ensuring data integrity. This behavior is confirmed in the functional description and Truth Table V.

How does the M/S pin affect BUSY pin functionality on the 70V27L35PFI8?

When M/S = VIH, the 70V27L35PFI8 operates as a Master: BUSYL and BUSYR become push-pull outputs that signal contention to external devices. When M/S = VIL, it operates as a Slave: BUSYL and BUSYR become inputs that inhibit local writes when driven LOW by a Master - enabling hierarchical arbitration in multi-device systems as defined in Note 1 of the pin diagram.

What is the purpose of the SEM pin on the 70V27L35PFI8, and how is it used?

The SEM pin (SEML/SEMR) enables hardware semaphore register access on the 70V27L35PFI8. To read or write semaphore flags, CE must be HIGH and SEM LOW - placing the device in semaphore mode where A0–A2 select one of eight flags and I/O0 carries the write value (read appears on all I/Os). This is distinct from normal RAM access and requires specific control sequencing per Truth Table III.

Is the 70V27L35PFI8 RoHS-compliant and lead-free?

Yes, the 70V27L35PFI8 is a Green part per IDT's ordering information - meaning it meets RoHS Directive 2011/65/EU requirements with lead-free (Pb-free) terminations and halogen-free packaging. The datasheet explicitly states "Green parts available" and notes SnPb finish is EOL; the PFI8 suffix denotes lead-free TQFP packaging.