Renesas 70V631S10PRFI8

Overview

70V631S10PRFI8 from Integrated Device Technology is a high-speed 256K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 10 ns max read cycle time (commercial grade), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins. It enables simultaneous access to the same memory location in systems requiring real-time inter-processor communication, such as telecom line cards and industrial motion controllers.

For engineers reviewing the 70V631S10PRFI8 datasheet, 70V631S10PRFI8 pinout, 70V631S10PRFI8 application, or 70V631S10PRFI8 equivalent, key selection criteria include true dual-port arbitration logic, on-chip semaphore signaling, BUSY flag timing (tBAA ≤ 10 ns), JTAG support status (not available in TQFP), and compatibility with 128-pin TQFP, 208-ball BGA, or 256-ball BGA packages.

Technical Context

The 70V631S10PRFI8 implements fully asynchronous operation on both ports with separate byte controls (UBL/LBR, UBL/LBL) for bus-matching flexibility. Its on-chip arbitration logic resolves port contention using BUSY flags and supports MASTER/SLAVE cascading for 36-bit+ word expansion via M/S pin configuration.

It features full hardware semaphore signaling across ports using A0–A2 address lines to access eight shared flags, and supports interrupt generation (INTL/INTR) triggered by specific address writes (e.g., 3FFFE_H for INTL set). Power management includes four standby current modes (ISB1–ISB4), with ISB3 ≤ 15 mA at CMOS-level inputs.

Key Specifications

Pinout & Package

70V631S10PRFI8 is packaged in a 128-pin Thin Quad Flatpack (TQFP), body size 14 mm × 20 mm × 1.4 mm, with 0.5 mm lead pitch. All VDD pins require 3.3 V ±150 mV; VDDQ pins must match OPT pin state (3.3 V if OPT = VIH, 2.5 V if OPT = VIL).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1370D-100AXC and AS7C3256A-12JIN, the 70V631S10PRFI8 uniquely delivers true asynchronous dual-port operation with integrated arbitration and semaphore - eliminating external logic and reducing system-level timing complexity in real-time embedded systems.

Availability

70V631S10PRFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and medical imaging applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.

Supply support for 70V631S10PRFI8 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 and computing markets.

The 70V631S10PRFI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for real-time inter-processor communication in telecom, industrial, and aerospace systems demanding deterministic latency and hardware-coordinated resource sharing.

FAQ

What is the maximum operating frequency supported by the 70V631S10PRFI8?

The 70V631S10PRFI8 does not operate on a clock; it is an asynchronous device. Its speed is defined by access timing parameters: tRC (read cycle time) is 10 ns max, tWC (write cycle time) is 10 ns max, and tAA (address access time) is 10 ns max - all specified for commercial temperature range (0°C to +70°C). These values define the minimum time between successive read/write operations.

Does the 70V631S10PRFI8 support JTAG boundary-scan testing?

No, the 70V631S10PRFI8 does not support JTAG boundary-scan. Although IEEE 1149.1-compliant JTAG features are implemented in the device architecture, they are explicitly disabled in the 128-pin TQFP package (PK-128) due to pin count limitations - and the 70V631S10PRFI8 is supplied in that package variant.

How does the BUSY flag function in Master vs. Slave configuration for the 70V631S10PRFI8?

In Master mode (M/S = VIH), BUSYL/BUSYR is an output that asserts when the opposite port initiates a write to the same address - blocking concurrent access. In Slave mode (M/S = VIL), BUSY is an input; the external master must drive it high before initiating a write. The 70V631S10PRFI8's BUSY timing (tBAA ≤ 10 ns) ensures rapid contention resolution.

Can the left and right ports of the 70V631S10PRFI8 operate at different I/O voltages simultaneously?

Yes. The 70V631S10PRFI8 supports independent I/O voltage selection per port: OPTL sets left-port I/O voltage (3.3 V or 2.5 V), and OPTR sets right-port I/O voltage. This allows mixed-voltage interfacing - e.g., left port at 2.5 V for legacy FPGA, right port at 3.3 V for modern microcontroller - with corresponding VDDQL/VDDQR supplies.

What is the purpose of the semaphore feature in the 70V631S10PRFI8, and how is it accessed?

The 70V631S10PRFI8 provides eight hardware semaphore flags for inter-processor resource locking. They are accessed via A0–A2 address lines while SEM = VIL and CE = VIH. Writing to I/O0 updates the flag; reading returns the value on all I/O lines (I/O0–I/O17). This eliminates software polling and enables atomic operations without CPU intervention - a core capability of the 70V631S10PRFI8.