Renesas 70T659S10BC8

Overview

70T659S10BC8 from Integrated Device Technology is a high-speed 256K x 36 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 - used in real-time inter-processor communication, FPGA co-processing buffers, and telecom line card memory arbitration.

For engineers reviewing the 70T659S10BC8 datasheet, 70T659S10BC8 pinout, 70T659S10BC8 application, or 70T659S10BC8 equivalent, key selection criteria include simultaneous dual-port access latency, RapidWrite mode timing compliance, M/S master/slave cascading support, and industrial-grade –40°C to +85°C operation in BC-256 BGA packaging.

Technical Context

The 70T659S10BC8 implements true dual-port SRAM cells enabling concurrent read/write to the same address without collision. Its on-chip arbitration logic resolves port contention via BUSY flag signaling and supports semaphore-based synchronization across ports using dedicated SEM pins and I/O0–I/O35 for flag exchange.

It features separate byte enables (BE0–BE3) per port for 9-bit sub-word writes, JTAG IEEE 1149.1 test access, and sleep mode (ZZL/ZZR) reducing current to ≤10 mA. The device supports depth expansion via dual CE inputs and data bus widening to 72+ bits using M/S-selectable master/slave configuration.

Key Specifications

Pinout & Package

70T659S10BC8 is housed in a 256-ball fine-pitch BGA (package code BC256) with 17 mm × 17 mm body and 1.0 mm ball pitch. Pin assignments follow IDT's standard dual-port layout with mirrored left/right I/O banks, dedicated control groups per port, and JTAG boundary-scan support.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C33256PFS-10BIN, the 70T659S10BC8 uniquely delivers 36-bit dual-port operation with integrated semaphore, RapidWrite, and 2.5 V core - making it optimal for tightly coupled, real-time embedded systems requiring deterministic inter-processor memory sharing.

Availability

70T659S10BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, avionics sensor fusion, and FPGA co-processing applications requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for 70T659S10BC8 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 sensor signal conditioning ICs for communications, computing, and industrial markets.

The 70T659S10BC8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for real-time inter-processor communication, FPGA offload buffering, and systems demanding deterministic, low-latency shared memory with hardware arbitration.

FAQ

What is the memory organization and total capacity of the 70T659S10BC8?

The 70T659S10BC8 provides a 256K x 36-bit memory array, totaling 9,216 Kbits (1.125 MB). It supports both standalone 36-bit operation and cascaded 72-bit+ configurations using master/slave select (M/S) mode. Address lines A0L–A17L and A0R–A17R each provide 18-bit addressing, with A17x designated as no-connect for the 70T659 variant - confirming the 256K depth limit.

Does the 70T659S10BC8 support simultaneous read and write operations to the same memory location?

Yes, the 70T659S10BC8 implements true dual-port SRAM cells that permit fully independent, asynchronous read and write access to the same address from left and right ports. On-chip arbitration logic uses BUSY flags and semaphore signaling to prevent data corruption during contention - ensuring deterministic behavior without external logic.

What are the power supply requirements for the 70T659S10BC8 core and I/O interfaces?

70T659S10BC8 requires a 2.5 V ±100 mV supply on all VDD pins for the core logic. Each port's I/O interface voltage is independently configurable: setting OPTL/OPTR to VDD (2.5 V) selects 3.3 V I/O levels (requiring VDDQL/VDDQR = 3.3 V), while setting OPTL/OPTR to VSS (0 V) selects 2.5 V I/O levels (requiring VDDQL/VDDQR = 2.5 V).

How does RapidWrite mode function in the 70T659S10BC8, and what timing parameters change?

In RapidWrite mode, the 70T659S10BC8 allows consecutive write cycles without toggling R/W, CE, or BE signals - address transition defines write end. tAS and tWR become irrelevant during pure write bursts; tDW and tDH are referenced to address change instead of R/W edge. All other AC specs (tWC, tEW, tAW) remain unchanged and must still be met.

Is the 70T659S10BC8 available in an industrial temperature grade, and what is its package type?

Yes, the 70T659S10BC8 is qualified for industrial operation from –40°C to +85°C with full 10 ns timing specification. It is packaged in a 256-ball fine-pitch BGA (BC256) with 17 mm × 17 mm footprint and 1.0 mm ball pitch - documented in IDT datasheet DSC-5632/10 and compliant with JEDEC MO-270AB standards.