Renesas 70T651S10BFGI

Overview

70T651S10BFGI 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 buffering systems.

For engineers reviewing the 70T651S10BFGI datasheet, 70T651S10BFGI pinout, 70T651S10BFGI application, or 70T651S10BFGI equivalent, key selection criteria include simultaneous dual-port access latency, RapidWrite mode timing compliance, M/S arbitration support, and industrial-grade (–40°C to +85°C) operation in fpBGA-208 packaging.

Technical Context

This device implements true dual-port SRAM architecture with fully asynchronous operation on both ports, on-chip semaphore logic for inter-port synchronization, and hardware-supported busy/interrupt flag signaling. It supports Master/Slave cascading for 72-bit+ data width expansion without external logic.

RapidWrite Mode enables back-to-back write cycles without pulsing R/W, CE, or BE between addresses-reducing control overhead at 10 ns cycle time. Each port features independent OPT pins to configure I/O voltage (2.5 V or 3.3 V), with dedicated VDDQ supplies and separate byte-enable (BE0–BE3) for 9-bit granularity.

Key Specifications

Pinout & Package

70T651S10BFGI is housed in a 208-ball fpBGA (BFG208) package with 0.8 mm ball pitch and 15 mm × 15 mm body size. Power and ground balls are distributed across the array for low-impedance supply delivery and signal integrity.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C3256A-10TCN, the 70T651S10BFGI uniquely delivers true dual-port operation with integrated arbitration, RapidWrite acceleration, and flexible per-port I/O voltage-making it the sole option for deterministic, low-latency shared memory in industrial and telecom systems requiring <10 ns access and hardware semaphore support.

Availability

70T651S10BFGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and industrial temperature compliance.

Supply support for 70T651S10BFGI 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 and computing markets.

The 70T651S10BFGI belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where latency, reliability, and hardware arbitration are critical.

FAQ

What is the maximum operating frequency supported by the 70T651S10BFGI?

The 70T651S10BFGI does not operate at a clock frequency-it is an asynchronous device. Its performance is defined by timing parameters: 10 ns read cycle time (tRC) and 10 ns address access time (tAA), enabling effective throughput up to 100 MHz per port under optimal board layout and loading conditions. The 70T651S10BFGI achieves this without internal clocking, simplifying system timing design.

Does the 70T651S10BFGI support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes-the 70T651S10BFGI supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VSS and OPTR = VDD configures the left port for 2.5 V operation and the right port for 3.3 V operation, allowing seamless interfacing with mixed-voltage subsystems. VDDQL and VDDQR supplies must match the selected levels accordingly.

How does RapidWrite Mode function in the 70T651S10BFGI, and what timing constraints apply?

RapidWrite Mode in the 70T651S10BFGI allows consecutive write operations without toggling R/W, CE, or BE signals between addresses-the end of each write is defined by the next address transition. Designers must still meet tWC (10 ns), tDW (6 ns), and tDH (0 ns), with setup/hold referenced to address change. This eliminates complex pulse-generation logic and reduces controller overhead in high-throughput write scenarios.

Can the 70T651S10BFGI be used in Master/Slave configurations, and how is arbitration handled?

Yes-the 70T651S10BFGI supports Master/Slave cascading using the M/S pin. When M/S = VIH, the port asserts BUSY as an output; when M/S = VIL, BUSY becomes an input. Combined with on-chip semaphore logic (SEML/SEMR), this enables hardware-managed arbitration across multiple devices without external logic-critical for expanding data width beyond 36 bits while maintaining full-speed operation.

What is the industrial temperature rating of the 70T651S10BFGI, and is it validated across all speed grades?

The 70T651S10BFGI is rated for industrial temperature operation from –40°C to +85°C. This rating applies to the 10 ns and 12 ns speed grades; the 15 ns grade is commercial-only (0°C to +70°C). The 70T651S10BFGI part number explicitly denotes the 10 ns industrial variant, and its datasheet confirms full specification compliance across the entire industrial range, including IDD, ISB, and timing parameters.