Renesas 70V631S10PRFI

Overview

70V631S10PRFI from Integrated Device Technology (IDT) is a high-speed, fully asynchronous 256K × 18 dual-port static RAM with independent left/right ports, 10 ns max read cycle time, LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port. It enables simultaneous access to the same memory location in systems requiring real-time inter-processor communication, such as telecom line cards and industrial PLCs.

For engineers reviewing the 70V631S10PRFI datasheet, 70V631S10PRFI pinout, 70V631S10PRFI application, or 70V631S10PRFI equivalent, key selection considerations include its true dual-port arbitration logic, on-chip semaphore support, BUSY flag timing (tBAA ≤ 10 ns), industrial temperature range (–40°C to +85°C), and compatibility with 128-pin TQFP, 208-ball BGA, and 256-ball BGA packages.

Technical Context

The 70V631S10PRFI implements fully asynchronous dual-port operation with separate address, control, and data buses for left and right ports - enabling concurrent read/write access without external synchronization logic. Its on-chip arbitration logic resolves contention via hardware BUSY flag assertion and supports master/slave cascading for 36-bit+ word expansion using M/S pin configuration.

It integrates full semaphore signaling (8 flags addressed by A0–A2) and interrupt flag generation (INTL/INTR), both controlled via dedicated control pins and validated timing windows (tSOP ≤ 4 ns, tINS ≤ 10 ns). The device supports JTAG IEEE 1149.1 compliance - except on the 128-pin TQFP package due to pin count limitation.

Key Specifications

Pinout & Package

70V631S10PRFI is available in a 128-pin Thin Quad Flatpack (TQFP) package (PK-128), measuring approximately 14 mm × 20 mm × 1.4 mm, with standard 0.5 mm lead pitch. All VDD pins require 3.3 V supply; VDDQ pins must match selected I/O voltage (3.3 V if OPT = VIH, 2.5 V if OPT = VIL); all VSS pins connect to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10ZXC and AS7C3256B-10TIN, the 70V631S10PRFI uniquely delivers per-port I/O voltage selection, hardware semaphore/interrupt, and master/slave expansion - reducing system-level complexity and enabling robust real-time IPC in space-constrained industrial and telecom platforms.

Availability

70V631S10PRFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics data concentrators, and medical imaging systems requiring stable component supply across extended product lifecycles.

Supply support for 70V631S10PRFI 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 power management ICs before its acquisition by Renesas Electronics in 2019. IDT pioneered high-performance dual-port SRAM architectures for real-time embedded systems.

The 70V631S series was designed specifically for deterministic inter-processor communication in telecom, industrial control, and aerospace applications - emphasizing low-latency arbitration, flexible voltage interfaces, and industrial reliability.

FAQ

What is the maximum operating frequency supported by the 70V631S10PRFI?

The 70V631S10PRFI does not operate at a fixed clock frequency - it is an asynchronous dual-port SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 10 ns, enabling effective operation up to 100 MHz in systems where address/control setup/hold times are met. Actual system throughput depends on controller timing margins and bus protocol implementation.

Does the 70V631S10PRFI support JTAG boundary scan?

Yes, the 70V631S10PRFI supports IEEE 1149.1 JTAG boundary scan, but only on the 208-ball BGA and 256-ball BGA packages. JTAG is explicitly excluded from the 128-pin TQFP (PK-128) variant due to insufficient pin count - as confirmed in the datasheet note on page 1.

How does the BUSY flag function in master vs. slave configuration?

In master mode (M/S = VIH), BUSYL/BUSYR are outputs that assert when port contention occurs - blocking writes on the opposing port until deasserted. In slave mode (M/S = VIL), BUSYL/BUSYR become inputs; the device waits for the master's BUSY signal to go high before initiating writes. This hardware handshake ensures deterministic arbitration without software overhead.

Can the left and right ports of the 70V631S10PRFI operate at different I/O voltages?

Yes - the 70V631S10PRFI supports independent I/O voltage selection per port. OPTL sets the left port's I/O voltage (3.3 V if VIH, 2.5 V if VIL); OPTR sets the right port's. Corresponding VDDQL and VDDQR supplies must match the selected levels. This enables direct interfacing with mixed-voltage FPGAs or ASICs without external level shifters.

What is the purpose of the semaphore feature in the 70V631S10PRFI?

The semaphore feature provides eight hardware-managed synchronization flags accessible via I/O0–I/O17 using address lines A0–A2. It enables lock-free inter-processor communication - for example, allowing one processor to signal completion of a data block while the other waits on the semaphore flag. Access timing is guaranteed (tSOP ≤ 4 ns), eliminating polling delays.