Renesas 70V631S12PRFI

Overview

70V631S12PRFI from IDT (Integrated Device Technology) is a high-speed, fully asynchronous 256K × 18 dual-port static RAM with independent left/right ports, 12 ns max access time, 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins. It supports simultaneous read/write to the same memory location and is used in real-time inter-processor communication systems requiring deterministic latency and hardware semaphore arbitration.

For engineers reviewing the 70V631S12PRFI datasheet, 70V631S12PRFI pinout, 70V631S12PRFI application, or 70V631S12PRFI equivalent, key selection criteria include its true dual-port architecture, BUSY/INT flag timing (tBAA ≤ 12 ns), on-chip semaphore logic, industrial temperature support (–40°C to +85°C), and compatibility with 128-pin TQFP, 208-ball BGA, and 256-ball BGA packages.

Technical Context

The 70V631S12PRFI implements fully asynchronous operation on both ports with separate byte controls (UBL/LBR, UBL/LBL), enabling multiplexed bus matching and independent data width management. Its on-chip arbitration logic resolves port contention using BUSY flag assertion based on address match or chip enable timing, with priority set-up time tAPS = 5 ns.

It integrates full hardware semaphore signaling across ports using dedicated SEM pins and I/O0–I/O17 for flag exchange, supporting eight semaphore flags addressed by A0–A2. The device supports JTAG IEEE 1149.1 compliance-except on the 128-pin TQFP package due to pin count limitation.

Key Specifications

Pinout & Package

70V631S12PRFI is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size ≈ 14 mm × 20 mm × 1.4 mm. 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 CY7C1362BV33-12BGXI and AS7C33256PFSIG-12, the 70V631S12PRFI uniquely delivers 18-bit width with per-port 2.5 V/3.3 V I/O selectability, integrated BUSY arbitration, and hardware semaphore-enabling simpler, more robust real-time inter-processor communication without external components.

Availability

70V631S12PRFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and medical imaging systems requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V631S12PRFI 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 power management ICs for communications, computing, and industrial markets.

The 70V631S12PRFI belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and semaphore support are critical.

FAQ

What is the maximum operating temperature range for the 70V631S12PRFI?

The 70V631S12PRFI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all DC and AC electrical parameters, including access time (tAA ≤ 12 ns), BUSY timing (tBAA ≤ 12 ns), and standby current (ISB1 ≤ 150 mA), making it suitable for harsh-environment applications such as base station radios and factory automation controllers.

Does the 70V631S12PRFI support JTAG boundary scan?

The 70V631S12PRFI supports IEEE 1149.1 JTAG features-but only on the 208-ball BGA and 256-ball BGA packages. JTAG is explicitly excluded from the 128-pin TQFP variant (including 70V631S12PRFI) due to insufficient pin count, as confirmed in the datasheet note on page 1: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package."

How does the BUSY arbitration work on the 70V631S12PRFI?

The 70V631S12PRFI implements hardware BUSY arbitration triggered by either address match (tBAA ≤ 12 ns) or chip enable assertion (tBAC ≤ 12 ns). When configured as Master (M/S = VIH), BUSY is an output that blocks writes on the contending port; as Slave (M/S = VIL), BUSY is an input that halts local writes until deasserted. Priority is resolved via tAPS = 5 ns setup time, ensuring deterministic conflict resolution without software intervention.

Can the left and right ports of the 70V631S12PRFI operate at different I/O voltages?

Yes-the 70V631S12PRFI allows independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH configures the left port for 3.3 V I/O levels (requiring VDDQL = 3.3 V), while OPTR = VIL configures the right port for 2.5 V I/O (requiring VDDQR = 2.5 V). This enables direct interfacing with mixed-voltage SoCs or FPGAs without level-shifting components.

What memory configuration does the 70V631S12PRFI implement?

The 70V631S12PRFI implements a 256K × 18 bit (4,608 Kbit) true dual-port SRAM architecture. Each port has independent 18-bit data I/O (I/O0L–I/O17L / I/O0R–I/O17R) and 18-bit address buses (A0L–A17L / A0R–A17R), supporting full 256K depth access. Its MASTER/SLAVE cascading capability allows expansion to 36-bit or wider word systems without external logic.