Renesas 70V659S10BCG

Overview

70V659S10BCG from IDT is a high-speed 128K × 36 asynchronous dual-port static RAM with true independent left/right ports, 10 ns max access time (commercial grade), LVTTL-compatible I/Os, and on-chip semaphore arbitration logic. It supports simultaneous read/write to the same memory location and is used in real-time inter-processor communication systems requiring deterministic latency and collision-free data exchange.

For engineers reviewing the 70V659S10BCG datasheet, 70V659S10BCG pinout, 70V659S10BCG application, or 70V659S10BCG equivalent, this page delivers verified electrical specs, port-level voltage configuration (3.3V/2.5V I/O select), BUSY/INT flag behavior, JTAG 1149.1 compliance, and master/slave cascading support for 72-bit+ memory expansion - all confirmed for the BCG (256-ball BGA) package variant.

Technical Context

The 70V659S10BCG implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses per port. Each port features independent chip enables (CE0/CE1), byte enables (BE0–BE3), read/write (R/W), output enable (OE), and semaphore (SEM) controls - enabling concurrent, non-blocking access without external arbitration logic.

It integrates hardware semaphore signaling across ports, with eight shared flags accessible via A0–A2 and I/O0–I/O35. The M/S pin configures BUSY as output (master) or input (slave), and OPTL/OPTR pins independently set each port's I/O voltage to 3.3V or 2.5V - critical for mixed-voltage system interfacing.

Key Specifications

Pinout & Package

70V659S10BCG is housed in a 256-ball fine-pitch BGA (package code BCG), with 15 mm × 15 mm footprint, 0.8 mm ball pitch, and 1.4 mm height. Power and ground balls are distributed across the array to minimize noise and ensure stable core/I/O rail delivery.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and IS61WV12836BLL-10BLI, the 70V659S10BCG uniquely delivers per-port 2.5V/3.3V I/O selection, integrated semaphore arbitration, and IEEE 1149.1 JTAG - making it the only option for mixed-voltage, multi-core systems requiring zero-latency hardware coordination and production testability.

Availability

70V659S10BCG is available at Aetrix Electronics and suitable for real-time inter-processor communication, digital signal processing buffering, industrial PLC memory expansion, and automated test equipment pattern memory requiring stable component supply and long-term lifecycle support.

Supply support for 70V659S10BCG 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) is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V659S10BCG belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and mixed-voltage interoperability are critical.

FAQ

What is the maximum operating frequency supported by the 70V659S10BCG?

The 70V659S10BCG does not operate on a clock signal - it is an asynchronous device. Its performance is defined by access time: 10 ns maximum address access time (tAA) under commercial conditions (0°C to +70°C, VDD = 3.3V ±150 mV). This enables reliable operation in systems with effective read cycles up to 100 MHz, provided setup/hold timing is met. No internal PLL or frequency multiplier is present.

How does the M/S pin affect BUSY functionality in the 70V659S10BCG?

In the 70V659S10BCG, the M/S pin configures BUSY behavior per port: when M/S = VIH (3.3V), BUSYR/BUSYL act as push-pull outputs asserting high during port contention; when M/S = VIL (0V), BUSYR/BUSYL become inputs accepting external BUSY signals from a master device. This enables flexible master/slave topologies without external logic - critical for scalable multi-SRAM systems.

Can the left and right ports of the 70V659S10BCG operate at different I/O voltages?

Yes. The 70V659S10BCG supports independent I/O voltage selection per port: OPTL sets left-port I/O levels (3.3V if tied to VDD, 2.5V if tied to VSS), and OPTR does the same for the right port. VDDQL and VDDQR must be supplied accordingly. This allows the 70V659S10BCG to bridge 2.5V and 3.3V subsystems - for example, connecting a 2.5V FPGA to a 3.3V microcontroller via shared memory.

What is the role of the semaphore function in the 70V659S10BCG, and how is it accessed?

The 70V659S10BCG includes eight hardware semaphore flags for inter-port synchronization. They are accessed by setting SEM = VIL and CE = VIH (opposite of RAM access), then using A0–A2 to select the flag and I/O0–I/O35 to read/write its value. This dedicated path avoids memory address conflicts and enables atomic lock/unlock operations - essential for preventing race conditions in real-time multi-core applications.

Is the 70V659S10BCG pin-compatible with other members of the 70V659/58/57 family?

No - the 70V659S10BCG is not pin-compatible with 70V658 or 70V657 variants. While sharing the same BCG package footprint, A16L/A16R and A15L/A15R are no-connects in the 70V659S10BCG (supporting 128K × 36), but are functional address lines in lower-density versions. Using a 70V659S10BCG in a 70V658-design PCB would result in unconnected address pins and incorrect memory mapping.