Renesas 70V631S10BCG

Overview

70V631S10BCG from IDT (Integrated Device Technology) 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-designed for real-time inter-processor communication in telecom switching fabric and industrial motion control systems.

For engineers reviewing the 70V631S10BCG datasheet, 70V631S10BCG pinout, 70V631S10BCG application, or 70V631S10BCG equivalent, this page delivers verified timing specs, Master/Slave arbitration behavior, BUSY/INT flag operation, true dual-port contention resolution, and package-specific I/O voltage configuration guidance for TQFP-128 layout integration.

Technical Context

The 70V631S10BCG implements fully asynchronous dual-port access with on-chip arbitration logic, semaphore signaling across both ports, and hardware-controlled BUSY flag generation during address contention. It supports independent chip enables (CE0/CE1 per port), byte-selectable reads/writes (UB/LB), and Master/Slave cascading for 36-bit+ word expansion without external logic.

Its dual-port architecture enables simultaneous read/write to the same memory location with deterministic priority resolution via M/S pin configuration and tAPS setup timing. JTAG is omitted in the 128-pin TQFP package (BCG), and power management includes four standby current modes (ISB1–ISB4) controlled by CE states and input voltage thresholds.

Key Specifications

Pinout & Package

70V631S10BCG is housed in a 128-pin Thin Quad Flatpack (TQFP) package, designated PK-128, with 0.5 mm lead pitch and 14 mm × 20 mm footprint. All VDD pins must be connected to 3.3 V; VDDQL/VDDQR voltages depend on OPTL/OPTR logic levels; all VSS pins require solid ground connection.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C33256PFSIG, the 70V631S10BCG uniquely delivers per-port I/O voltage flexibility, integrated semaphore signaling, and deterministic BUSY-based arbitration-enabling robust real-time inter-processor communication without external logic or firmware intervention.

Availability

70V631S10BCG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle support, and guaranteed commercial-grade timing performance.

Supply support for 70V631S10BCG 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, specializes in high-performance timing, memory interface, and RF solutions for communications, computing, and industrial markets.

The 70V631S10BCG belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in multi-CPU and FPGA-based real-time systems.

FAQ

What is the maximum operating frequency supported by the 70V631S10BCG?

The 70V631S10BCG does not operate at a fixed clock frequency-it is fully asynchronous. Its speed is defined by timing parameters: 10 ns maximum read cycle time (tRC), 10 ns address access time (tAA), and 10 ns chip enable access time (tACE). These values enable effective operation up to ~100 MHz in tightly controlled systems, but actual throughput depends on system-level timing margins and bus protocol overhead. The 70V631S10BCG achieves this performance with zero wait states under optimal conditions.

How does the M/S pin affect BUSY pin functionality in the 70V631S10BCG?

In the 70V631S10BCG, the M/S pin configures BUSY behavior: when M/S = VIH, BUSY is an output that asserts during address contention to block the opposing port; when M/S = VIL, BUSY becomes an input used to receive BUSY signals from a Master device. This dual-role design enables flexible Master/Slave cascading-critical for expanding data bus width beyond 18 bits while preserving deterministic arbitration. The 70V631S10BCG's tBAA ≤ 10 ns ensures rapid BUSY response.

Can the left and right ports of the 70V631S10BCG operate at different I/O voltages?

Yes-the 70V631S10BCG 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 operation (requiring VDDQL = 3.3 V), while OPTR = VIL configures the right port for 2.5 V I/O (requiring VDDQR = 2.5 V). This mixed-voltage capability allows seamless interfacing between 3.3 V microcontrollers and 2.5 V FPGAs without level shifters. The 70V631S10BCG's DC specs guarantee VOH/VOL compliance under both configurations.

What is the purpose of the semaphore feature in the 70V631S10BCG?

The semaphore feature in the 70V631S10BCG provides eight dedicated hardware flags (accessed via A0–A2) for inter-port synchronization-enabling atomic "test-and-set" operations without software polling or external locks. When SEM = VIL and CE = VIH, the device enters semaphore mode, allowing one port to write to or read from the flag register while the other port monitors state changes. This eliminates race conditions in shared-resource access, a key requirement in the 70V631S10BCG's target applications like motion control and telecom switching.

Does the 70V631S10BCG support JTAG boundary scan?

No-the 70V631S10BCG does not support JTAG boundary scan in the 128-pin TQFP package (BCG suffix), as explicitly stated in the datasheet: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package." While JTAG pins (TCK, TMS, TDI, TDO, TRST) are present in BGA variants (e.g., BF208, BC256), they are omitted or unconnected in the PK-128 footprint. Designers using the 70V631S10BCG must rely on functional testing rather than boundary-scan diagnostics.