Renesas 70V631S10PRF

Overview

70V631S10PRF from IDT (Integrated Device Technology) is a high-speed, fully asynchronous 256K × 18-bit dual-port static RAM with independent left/right ports, 10 ns max access 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 read/write access to the same memory location and supports MASTER/SLAVE cascading for 36-bit+ bus expansion in telecom switching and real-time DSP systems.

For engineers reviewing the 70V631S10PRF datasheet, 70V631S10PRF pinout, 70V631S10PRF application, or 70V631S10PRF equivalent, key selection criteria include true dual-port arbitration logic, BUSY/INT semaphore signaling, JTAG support (in BGA packages only), industrial temperature option (-40°C to +85°C), and 128-pin TQFP package compatibility with depth-expansion capability using CE0/CE1 and M/S control.

Technical Context

The 70V631S10PRF implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling concurrent access without clock synchronization. Its on-chip arbitration logic resolves contention via BUSY flag assertion (MASTER mode) or BUSY input sampling (SLAVE mode), with tBDD ≤ 10 ns propagation delay from write completion to valid read data on the opposing port.

It supports per-port I/O voltage selection (3.3 V or 2.5 V) via independent OPTL/OPTR pins, allowing mixed-voltage system interfacing. Semaphore and interrupt flags (SEML/SEMR, INTL/INTR) are hardware-managed with dedicated address-mapped registers (A0–A2), and all control signals-including CE0/CE1, R/W, OE, UB/LB-are fully decoded on-die with no external logic required for byte-level access.

Key Specifications

Pinout & Package

70V631S10PRF is packaged in a 128-pin Thin Quad Flatpack (TQFP), with 16 address pins per port (A0L–A17L / A0R–A17R), 18 bidirectional data lines per port (I/O0L–I/O17L / I/O0R–I/O17R), dual chip enables (CE0/CE1 per port), and dedicated control signals including R/W, OE, UB/LB, BUSY, INT, SEM, and M/S.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C3256B-10TIN, the 70V631S10PRF uniquely delivers per-port I/O voltage selection and integrated hardware arbitration-enabling mixed-voltage, multi-processor designs without external glue logic or test infrastructure compromises.

Availability

70V631S10PRF is available at Aetrix Electronics and suitable for telecom switching infrastructure, real-time DSP subsystems, and industrial motion controllers requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for 70V631S10PRF 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 solutions for communications, computing, and industrial markets.

The 70V631S10PRF belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic, low-latency shared memory in multi-processor and real-time embedded systems where software arbitration introduces unacceptable jitter.

FAQ

What is the maximum operating frequency supported by the 70V631S10PRF?

The 70V631S10PRF does not operate on a clock signal-it is fully asynchronous. Its 10 ns maximum access time enables reliable operation on buses with cycle times ≥10 ns, corresponding to effective throughput up to 100 MHz in read/write-limited scenarios. Timing is governed by tRC (read cycle time) and tWC (write cycle time), both specified at 10 ns min for the 70V631S10PRF variant.

Does the 70V631S10PRF support JTAG boundary scan?

No-the 70V631S10PRF does not support JTAG boundary scan in its 128-pin TQFP package due to pin count limitations. JTAG (IEEE 1149.1) is only available on the 208-ball and 256-ball BGA variants (e.g., 70V631S10PFGI, 70V631S10PFGI). The TQFP package omits TDI, TDO, TCK, TMS, and TRST pins entirely.

How does the M/S pin affect BUSY functionality in the 70V631S10PRF?

In the 70V631S10PRF, the M/S pin configures BUSY behavior: when M/S = VIH, the device operates as MASTER and asserts BUSY as an output to block conflicting writes on the opposing port; when M/S = VIL, it acts as SLAVE and samples BUSY as an input to inhibit local writes during contention. This enables hierarchical memory systems with priority-based arbitration.

Can the left and right ports of the 70V631S10PRF operate at different I/O voltages?

Yes-the 70V631S10PRF supports 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 (with VDDQL = 3.3 V), while OPTR = VIL sets the right port for 2.5 V I/O (with VDDQR = 2.5 V). This allows direct interfacing with heterogeneous logic families without level shifters.

What is the purpose of the semaphore flags in the 70V631S10PRF?

The 70V631S10PRF integrates eight hardware semaphore flags accessible via address bits A0–A2. These flags provide atomic, lock-free resource synchronization between ports-enabling safe shared-memory access in multi-processor systems without software overhead or race conditions. Semaphore read/write is controlled by CE and SEM pins per Truth Table II.