Renesas 70T651S12BFGI8

Overview

70T651S12BFGI8 from Integrated Device Technology is a high-speed 256K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 12 ns max access time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port - used in real-time inter-processor communication, FPGA co-processor buffering, and telecom line-card memory arbitration.

For engineers reviewing the 70T651S12BFGI8 datasheet, 70T651S12BFGI8 pinout, 70T651S12BFGI8 application, or 70T651S12BFGI8 equivalent, this page delivers verified package mapping (208-ball fpBGA), true dual-port timing behavior, RapidWrite mode operation, industrial temperature support (–40°C to +85°C), and JTAG-compliant IEEE 1149.1 testability - all critical for deterministic low-latency memory subsystem design.

Technical Context

The 70T651S12BFGI8 implements fully asynchronous dual-port architecture with on-chip arbitration logic and hardware semaphore signaling across ports. It supports simultaneous read/write to the same memory location without external logic, enabling lock-free inter-core data exchange in master/slave configurations.

Each port features independent CE0/CE1 enables, R/W control, byte enables (BE0–BE3), output enable (OE), and dedicated BUSY/INT/SEM signals. The device operates with 2.5 V core (VDD) and configurable I/O voltage (VDDQ = 2.5 V or 3.3 V) controlled by OPTL/OPTR pins - allowing mixed-voltage system integration.

Key Specifications

Pinout & Package

70T651S12BFGI8 is housed in a 208-ball fpBGA (BFG208) package with 0.8 mm ball pitch, 15 mm × 15 mm footprint, and 1.4 mm height. Ball assignments follow JEDEC MO-245 standard; power/ground balls are distributed across the array for low-inductance decoupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1371D-100BAXI and R1EX24032AS0C-000, the 70T651S12BFGI8 uniquely delivers per-port I/O voltage selection, RapidWrite mode for burst efficiency, and integrated JTAG - making it optimal for mixed-signal, low-latency, and test-critical embedded systems requiring guaranteed industrial-grade timing.

Availability

70T651S12BFGI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle support, and traceable sourcing of high-reliability dual-port memory.

Supply support for 70T651S12BFGI8 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 high-performance interconnect solutions.

The 70T651S12BFGI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic low-latency memory sharing between heterogeneous processors in mission-critical embedded systems.

FAQ

What is the maximum operating frequency supported by the 70T651S12BFGI8?

The 70T651S12BFGI8 does not operate on a clock signal - it is an asynchronous SRAM. Its performance is defined by access time (tAA ≤ 12 ns) and cycle time (tRC ≤ 12 ns), enabling effective operation up to ~83 MHz for random accesses. System-level throughput depends on address/data setup/hold timing and bus protocol, not a clock frequency specification.

Does the 70T651S12BFGI8 support true simultaneous read/write on both ports to the same address?

Yes, the 70T651S12BFGI8 uses true dual-port memory cells that permit concurrent read and write operations to the identical memory location - one port reading while the other writes - without data corruption or arbitration delay. This is confirmed in the Functional Block Diagram and Truth Table I of the official datasheet.

How does RapidWrite mode function in the 70T651S12BFGI8, and what timing parameters change?

In RapidWrite mode, the 70T651S12BFGI8 allows consecutive write cycles without toggling R/W, CE, or BE between addresses. The write cycle end is defined by the next address transition. tAS and tWR become irrelevant during back-to-back writes; instead, tDW and tDH are referenced to the address transition, and tWC must still be met. This is explicitly documented in the "RapidWrite Mode Write Cycle" section (page 14).

Can the left and right ports of the 70T651S12BFGI8 operate at different I/O voltages simultaneously?

Yes - OPTL and OPTR are independent inputs. Setting OPTL = VSS configures the left port for 2.5 V I/O (with VDDQL = 2.5 V), while setting OPTR = VDD configures the right port for 3.3 V I/O (with VDDQR = 3.3 V). This mixed-voltage operation is explicitly supported and electrically characterized in Tables 5 and 6 of the datasheet.

Is JTAG boundary scan available on the 70T651S12BFGI8, and which pins are used?

Yes, the 70T651S12BFGI8 fully complies with IEEE 1149.1 JTAG. Pins TCK, TMS, TDI, TDO, and TRST are dedicated for boundary scan; they remain functional even during ZZ sleep mode. JTAG operation is detailed in the Pin Names table (page 6) and is unaffected by OPT/VDDQ settings.