Renesas 70V631S10PRFG

Overview

70V631S10PRFG from IDT (now part of Renesas) is a high-speed 256K × 18 asynchronous dual-port static RAM with fully 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-used in real-time inter-processor communication, FPGA co-processor buffering, and telecom line card data exchange.

For engineers reviewing the 70V631S10PRFG datasheet, 70V631S10PRFG pinout, 70V631S10PRFG application, or 70V631S10PRFG equivalent, this page delivers verified package mapping (208-ball BGA), true dual-port arbitration logic, BUSY/INT/SEM signaling behavior, industrial-grade timing specs, and validated alternatives for memory expansion in deterministic systems.

Technical Context

The 70V631S10PRFG implements true dual-port SRAM cells enabling simultaneous read/write access to the same address without external arbitration. Its on-chip port arbitration logic resolves contention via BUSY flag assertion, with M/S pin configuring master/slave roles for depth expansion.

It supports JTAG IEEE 1149.1 boundary-scan (except in 128-pin TQFP), full hardware semaphore signaling across both ports using A0–A2 address lines, and independent OPTL/OPTR pins to set each port's I/O voltage to 3.3 V or 2.5 V-while maintaining fixed 3.3 V ±150 mV core supply (VDD).

Key Specifications

Pinout & Package

70V631S10PRFG is housed in a 208-ball fine-pitch BGA (package code BFG208), with 15 mm × 15 mm footprint and 0.8 mm ball pitch. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR logic level (3.3 V if VIH, 2.5 V if 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 CY7C028V-10ZXC and AS7C3256B-10JIN, the 70V631S10PRFG uniquely integrates per-port voltage selection, hardware semaphore, and master/slave BUSY arbitration-making it the only option among the three suitable for mixed-voltage, deterministic, multi-processor embedded systems requiring zero-software-coordination data sharing.

Availability

70V631S10PRFG is available at Aetrix Electronics and suitable for telecom infrastructure, avionics data concentrators, and medical imaging systems requiring stable component supply, long-lifecycle support, and traceable sourcing for safety-critical designs.

Supply support for 70V631S10PRFG 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

IDT (Integrated Device Technology), now part of Renesas Electronics, specialized in high-performance timing, memory, and interface ICs for communications, computing, and industrial markets before its 2019 acquisition.

The 70V631S10PRFG belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where latency, data integrity, and hardware-coordinated access are critical.

FAQ

What is the maximum operating temperature range for the 70V631S10PRFG?

The 70V631S10PRFG is specified for commercial temperature range only: 0°C to +70°C. It is not rated for industrial −40°C to +85°C operation. This is confirmed in the "Recommended Operating Temperature" table (page 7) and explicitly noted in the AC Electrical Characteristics tables where "70V631S12" (industrial) and "70V631S15" entries are marked "Com'l & Ind" or "Com'l", while "70V631S10" is labeled "Com'l Only".

Does the 70V631S10PRFG support JTAG boundary-scan testing?

Yes, the 70V631S10PRFG supports IEEE 1149.1 JTAG boundary-scan-but only in BGA packages (208-ball and 256-ball). The datasheet explicitly states: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package." Since 70V631S10PRFG uses the BFG208 (208-ball BGA) package, all five JTAG pins (TCK, TMS, TDI, TDO, TRST) are present and functional.

How does the BUSY arbitration work when the 70V631S10PRFG is configured as a slave?

When M/S = VIL (slave configuration), BUSYL is an input that must be driven by the master device's BUSYR output. The 70V631S10PRFG's write operation on the slave port is blocked until BUSYL goes HIGH-ensuring the master completes its conflicting access first. This behavior is defined in Note 1 of the Functional Block Diagram and confirmed in the "Timing Waveform of Write with BUSY (M/S = VIL)" diagram (page 15).

Can both ports of the 70V631S10PRFG operate at different I/O voltages simultaneously?

Yes. OPTL and OPTR are independent control pins: setting OPTL = VIL configures the left port for 2.5 V I/O (requiring VDDQL = 2.5 V), while OPTR = VIH configures the right port for 3.3 V I/O (requiring VDDQR = 3.3 V). This mixed-voltage operation is explicitly permitted in the "Pin Names" table (page 5) and "Recommended DC Operating Conditions" (pages 7–8).

What address ranges trigger the interrupt flags INTL and INTR in the 70V631S10PRFG?

INTL is set by writing any value to address 3FFFEh on the left port and reset by writing to the same address on the right port; INTR is set by writing to 3FFFEh on the right port and reset by writing to 3FFFFh on the left port. This mapping is defined in Truth Table III (page 17) and applies regardless of CE/R/W state-provided the correct port is selected and BUSY flags are inactive.