Renesas 70V631S12BFGI8

Overview

70V631S12BFGI8 from IDT (now Renesas) is a high-speed 256K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns max access time (industrial grade), 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 to the same memory location in telecom switching fabric and real-time DSP co-processing systems.

For engineers reviewing the 70V631S12BFGI8 datasheet, 70V631S12BFGI8 pinout, 70V631S12BFGI8 application, or 70V631S12BFGI8 equivalent, key selection criteria include true dual-port arbitration logic, on-chip semaphore support, BUSY/INT flag timing (tBAA ≤ 12 ns), M/S master/slave cascading for 36-bit+ bus expansion, and industrial temperature operation (–40°C to +85°C).

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, data, and control buses per port - no clock required. Port arbitration is handled entirely in hardware via dedicated BUSY, SEM, and INT signals, eliminating external logic for conflict resolution.

Each port supports independent power domain configuration: VDD fixed at 3.3 V ±150 mV, while VDDQ (I/O supply) is set to either 3.3 V ±150 mV or 2.5 V ±100 mV per port using OPTL/OPTR pins. JTAG is omitted in this 208-ball BGA package due to pin count constraints.

Key Specifications

Pinout & Package

70V631S12BFGI8 is housed in a 208-ball fine-pitch BGA (package code BFG208), with 0.8 mm ball pitch and 15 mm × 15 mm footprint. Pin functions are defined per port (Left/Right), with dedicated arbitration (BUSY, SEM, INT), byte enable (UB/LB), and master/slave select (M/S) terminals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-12BGXI and AS7C3256B-12JIN, the 70V631S12BFGI8 uniquely delivers per-port I/O voltage flexibility, integrated semaphore registers, and M/S cascading - critical for mixed-voltage, high-reliability dual-processor architectures.

Availability

70V631S12BFGI8 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 industrial temperature performance.

Supply support for 70V631S12BFGI8 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, specializes in high-performance timing, memory, and interface solutions for communications and computing markets.

The 70V631S12BFGI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in mission-critical embedded systems.

FAQ

What is the operating temperature range for the 70V631S12BFGI8?

The 70V631S12BFGI8 is rated for industrial temperature operation from –40°C to +85°C. This is confirmed in the "Recommended Operating Temperature and Supply Voltage" table (page 7) and applies to all speed grades including the 12 ns variant. The device undergoes full characterization across this range for parameters including access time, power consumption, and BUSY arbitration timing.

Does the 70V631S12BFGI8 support JTAG boundary scan?

No, the 70V631S12BFGI8 does not support JTAG. As explicitly stated in the datasheet (page 1, Features section), "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package" - and this limitation extends to the 208-ball BGA variant (BFG208) used for 70V631S12BFGI8. The package lacks dedicated TMS, TCK, TDI, TDO, and TRST pins required for IEEE 1149.1 compliance.

How does the M/S pin affect BUSY signal behavior on the 70V631S12BFGI8?

On the 70V631S12BFGI8, the M/S pin determines BUSY signal direction: when M/S = VIH, the device operates as Master and BUSYL/BUSYR are outputs; when M/S = VIL, it operates as Slave and BUSYL/BUSYR become inputs. This is documented in Note 1 on page 2 and the Pin Names table (page 5), enabling hardware-controlled arbitration in cascaded configurations.

Can both ports of the 70V631S12BFGI8 operate at different I/O voltages simultaneously?

Yes. The 70V631S12BFGI8 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, while OPTR = VIL configures the right port for 2.5 V I/O - as specified in the Pin Names table (page 5) and DC Operating Conditions tables (pages 7–8). Both VDDQL and VDDQR must be supplied at their respective levels.

What is the maximum power consumption of the 70V631S12BFGI8 during active operation?

The 70V631S12BFGI8 has a maximum dynamic operating current (IDD) of 465 mA when both ports are active at maximum frequency (fMAX), as specified in Table 10 (page 8) for the 70V631S12 industrial grade. This value assumes VDD = 3.3 V ±150 mV and applies under worst-case commercial/industrial conditions with outputs disabled.