Renesas 70V27S35PF

Overview

70V27S35PF 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 (tRC), LVTTL-compatible I/O, and on-chip port arbitration logic - used in real-time embedded systems requiring concurrent CPU/DSP memory access.

For engineers reviewing the 70V27S35PF datasheet, 70V27S35PF pinout, 70V27S35PF application, or 70V27S35PF equivalent, key selection criteria include BUSY/INT flag timing, semaphore support for inter-processor synchronization, Master/Slave cascading capability, and industrial temperature operation (-40°C to +85°C) in 100-pin TQFP.

Technical Context

The 70V27S35PF implements fully asynchronous dual-port architecture with independent left/right address, control, and 16-bit bidirectional I/O buses. It supports both RAM array access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), with dedicated BUSY and INT flags for port arbitration and interrupt signaling.

Its on-chip arbitration logic resolves contention via address-match or chip-enable timing, with tAPS = 5ns priority setup time and tBDD ≤ 40ns disable-to-valid-data delay. The device uses CMOS process technology and features separate upper-byte (UB) and lower-byte (LB) enables for flexible bus-width matching in 32-bit+ systems.

Key Specifications

Pinout & Package

70V27S35PF is housed in a 100-pin TQFP (PN100-1) with 0.5 mm pitch, 14 mm × 14 mm footprint, and 1.4 mm height. All VDD pins require local decoupling; all VSS pins must be connected to ground plane.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-350BZXI and AS7C33128PFS-35BIN, the 70V27S35PF uniquely delivers hardware-accelerated inter-processor synchronization (semaphore + BUSY + INT) in a drop-in dual-port SRAM, reducing BOM count and eliminating timing-critical FPGA arbitration code.

Availability

70V27S35PF is available at Aetrix Electronics and suitable for real-time DSP systems, industrial PLC controllers, avionics data acquisition, and medical imaging subsystems requiring stable component supply and long-term industrial-grade availability.

Supply support for 70V27S35PF 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 safety-critical embedded systems - emphasizing hardware arbitration, interrupt signaling, and seamless Master/Slave scalability.

FAQ

What is the maximum operating frequency supported by the 70V27S35PF?

The 70V27S35PF does not operate on a clock signal - it is a fully asynchronous dual-port SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 35 ns, corresponding to an effective bandwidth of ~28.6 MHz for consecutive reads. Address access time (tAA) is also 35 ns max, ensuring deterministic latency without clock domain constraints.

Does the 70V27S35PF support industrial temperature range operation?

Yes, the 70V27S35PF is qualified for industrial temperature range operation from -40°C to +85°C. This is explicitly confirmed in the datasheet's "Commercial and Industrial Temperature Range" header and DC operating conditions table (Table 6), where the "Industrial" grade lists TA = -40°C to +85°C at VDD = 3.3 V ± 0.3 V.

How does the Master/Slave configuration work on the 70V27S35PF?

The M/S pin configures the 70V27S35PF's BUSY pins: when M/S = VIH, BUSYL and BUSYR are outputs indicating port contention (Master mode); when M/S = VIL, they become inputs that inhibit writes during contention (Slave mode). This enables cascaded systems where one device arbitrates and others obey - critical for expanding data width beyond 16 bits.

Can the 70V27S35PF be used without external arbitration logic?

Yes - the 70V27S35PF integrates full hardware arbitration including BUSY flag generation, semaphore registers, and interrupt signaling. When configured as Master (M/S = VIH), it autonomously asserts BUSY on the contending port, blocking writes until resolution. No external logic is needed for basic dual-processor coherency, unlike single-port SRAMs or QDR devices.

What is the function of the SEM pins on the 70V27S35PF?

The SEML and SEMR pins enable access to the internal 8-flag semaphore register. When SEM = VIL and CE = VIH, the device enters semaphore mode: A0–A2 select one of eight flags, and I/O0 writes the flag value while all I/O lines (I/O0–I/O15) read it back. This provides atomic lock/unlock capability essential for multi-processor resource sharing without software overhead.