Renesas 70T651S10BFI8

Overview

70T651S10BFI8 from Integrated Device Technology is a high-speed 256K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 10 ns read cycle time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port-designed for real-time inter-processor communication in telecom line cards and packet buffer applications.

For engineers reviewing the 70T651S10BFI8 datasheet, 70T651S10BFI8 pinout, 70T651S10BFI8 application, or 70T651S10BFI8 equivalent, key selection criteria include simultaneous dual-port access latency, on-chip semaphore arbitration, RapidWrite mode timing compliance, and industrial-grade (–40°C to +85°C) operation in BC-256 BGA packaging.

Technical Context

The 70T651S10BFI8 implements true dual-port SRAM cells enabling concurrent read/write access to the same memory location without external arbitration logic. Its on-chip port arbitration and semaphore logic support atomic flag exchange between master/slave configurations.

Each port features independent CE0/CE1 enables, R/W control, byte-enable (BE0–BE3) for 9-bit granularity, and JTAG IEEE 1149.1 compliance. Power management includes full standby (ISB3 ≤ 10 mA) and sleep mode (IZZ ≤ 10 mA) with ZZL/ZZR inputs.

Key Specifications

Pinout & Package

70T651S10BFI8 uses a 256-ball fine-pitch BGA (BC-256) package with separate left (L) and right (R) port signal groups, dedicated VDD/VDDQ/VSS balls, JTAG TAP pins (TCK/TMS/TDI/TDO/TRST), and dual sleep-mode inputs (ZZL/ZZR). Ball assignments follow IDT's standard dual-port layout with mirrored I/O banks (I/O0L–I/O35L / I/O0R–I/O35R) and independent control sets.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C33256P-10BIN, the 70T651S10BFI8 uniquely delivers simultaneous dual-port access with integrated arbitration, per-port I/O voltage flexibility, and RapidWrite-making it irreplaceable in tightly coupled real-time embedded systems requiring deterministic latency and minimal external logic.

Availability

70T651S10BFI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics data logging, and medical imaging subsystems requiring stable component supply, long-term lifecycle support, and industrial temperature reliability.

Supply support for 70T651S10BFI8 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 silicon solutions for communications and computing markets.

The 70T651S10BFI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in mission-critical embedded systems.

FAQ

What is the maximum operating temperature range for the 70T651S10BFI8?

The 70T651S10BFI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including tAA ≤ 10 ns, ISB3 ≤ 10 mA, and VOL ≤ 0.4 V at VDDQ = 2.5 V min. The device uses thermal characterization and burn-in testing to ensure reliability within this range.

Does the 70T651S10BFI8 support true simultaneous read/write access to the same memory location?

Yes, the 70T651S10BFI8 implements true dual-port SRAM cells that allow independent, asynchronous read and write operations to the same address location-one port reading while the other writes-without bus contention or data corruption. This behavior is guaranteed by the cell architecture, not external logic.

How does RapidWrite mode function in the 70T651S10BFI8?

RapidWrite mode in the 70T651S10BFI8 eliminates the need to pulse R/W between consecutive writes: R/W, CE, and BE remain asserted while address transitions define write boundaries. tDW and tDH are referenced to the ending address edge, and tWC (10 ns) still governs minimum cycle time-reducing controller timing complexity.

What are the I/O voltage options supported by the 70T651S10BFI8?

The 70T651S10BFI8 supports independent 2.5 V or 3.3 V I/O operation per port via OPTL and OPTR pins. When OPT = VSS, VDDQ must be 2.5 V; when OPT = VDD, VDDQ must be 3.3 V. Both ports may operate at the same or different voltages simultaneously.

Is JTAG boundary scan supported on the 70T651S10BFI8?

Yes, the 70T651S10BFI8 fully complies with IEEE 1149.1 JTAG boundary scan. Pins TCK, TMS, TDI, TDO, and TRST are dedicated and functional per the datasheet. JTAG remains active even during ZZ sleep mode, enabling in-system test and debug without disrupting power states.