Renesas 70V659S12DRGI8

Overview

70V659S12DRGI8 from IDT (now Renesas) is a high-speed 128K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 12 ns maximum access time, LVTTL-compatible I/Os, and on-chip semaphore arbitration logic. It supports simultaneous read/write to the same memory location and operates with 3.3 V core supply and selectable 3.3 V/2.5 V I/O voltage per port - used in real-time inter-processor communication systems requiring deterministic latency.

For engineers reviewing the 70V659S12DRGI8 datasheet, 70V659S12DRGI8 pinout, 70V659S12DRGI8 application, or 70V659S12DRGI8 equivalent, key selection criteria include dual-port arbitration behavior, BUSY/INT flag timing under M/S configuration, byte-enable granularity for 9-bit sub-word access, and JTAG IEEE 1149.1 compliance for boundary-scan testability in high-reliability embedded systems.

Technical Context

This device implements true dual-port SRAM architecture with fully asynchronous operation: each port has dedicated address, data, and control lines (CE0/CE1, R/W, OE, BE0–BE3), enabling concurrent access without external synchronization. The on-chip arbitration logic resolves contention via BUSY and semaphore flags, with master/slave mode selected by the M/S pin.

It integrates JTAG test infrastructure compliant with IEEE 1149.1, supporting TDI/TDO/TCK/TMS/TRST pins for boundary-scan diagnostics. I/O voltage level per port is independently configurable via OPTL/OPTR pins, allowing mixed-voltage system interfacing - e.g., 3.3 V left port to a microcontroller and 2.5 V right port to an FPGA I/O bank.

Key Specifications

Pinout & Package

208-pin PQFP package (IDT part code DR208/DRG208), 28 mm × 28 mm × 3.5 mm body, lead pitch 0.5 mm. All VDD pins require connection to 3.3 V; VDDQ pins must match OPT pin voltage selection (3.3 V or 2.5 V).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C09449V and R1EX24064AS, the 70V659S12DRGI8 uniquely delivers 12 ns industrial-grade access, per-port I/O voltage flexibility, integrated JTAG, and hardware semaphore - making it the only option that satisfies concurrent low-latency, mixed-voltage, and testable dual-processor memory requirements in a single 208-pin PQFP package.

Availability

70V659S12DRGI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, high-speed video buffering, and industrial PLC backplane interfaces requiring stable component supply across extended product lifecycles.

Supply support for 70V659S12DRGI8 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), now part of Renesas Electronics, is a semiconductor company specializing in timing, memory interface, and RF solutions for high-performance computing and communications systems.

The 70V659S12DRGI8 belongs to IDT's high-speed asynchronous dual-port SRAM family, designed specifically for deterministic, low-latency inter-processor communication in aerospace, industrial automation, and medical imaging equipment.

FAQ

What is the maximum operating temperature range supported by the 70V659S12DRGI8?

The 70V659S12DRGI8 is rated for industrial temperature operation from –40°C to +85°C, verified across all electrical parameters including 12 ns access time, BUSY arbitration timing, and I/O drive strength. This range is confirmed in the Absolute Maximum Ratings and DC/AC Electrical Characteristics tables of the official datasheet, and applies to both 208-pin PQFP and BGA variants.

How does the M/S pin affect BUSY signal behavior in the 70V659S12DRGI8?

When M/S = VIH, the 70V659S12DRGI8 operates as a Master and drives BUSYL/BUSYR as totem-pole outputs indicating port contention. When M/S = VIL, it operates as a Slave and BUSYL/BUSYR become inputs - allowing external arbitration logic to control write enable. This dual-mode behavior is explicitly defined in Note 2 on page 2 and Truth Table II, and is critical for cascaded Master/Slave configurations.

Can the left and right ports of the 70V659S12DRGI8 operate at different I/O voltages simultaneously?

Yes - the 70V659S12DRGI8 supports independent I/O voltage selection per port: OPTL sets left-port VDDQL to 3.3 V or 2.5 V, and OPTR sets right-port VDDQR identically. This is confirmed in Pin Names table (page 5) and Recommended DC Operating Conditions (pages 6–7), enabling direct interfacing with heterogeneous processors (e.g., 3.3 V MCU left port, 2.5 V FPGA right port) without level shifters.

What is the function of the BE0–BE3 pins on the 70V659S12DRGI8, and how do they map to data bits?

The BE0–BE3 pins on the 70V659S12DRGI8 enable independent 9-bit byte writes: BE0 controls I/O0–I/O8, BE1 controls I/O9–I/O17, BE2 controls I/O18–I/O26, and BE3 controls I/O27–I/O35. This mapping is defined in the Functional Block Diagram (page 1) and Truth Table I (page 7), allowing partial-word updates without read-modify-write cycles - essential for efficient protocol header manipulation in networking applications.

Does the 70V659S12DRGI8 support JTAG boundary-scan, and which pins are used?

Yes - the 70V659S12DRGI8 fully supports IEEE 1149.1 JTAG boundary-scan via dedicated pins: TDI (pin 199), TDO (pin 200), TCK (pin 197), TMS (pin 196), and TRST (pin 195). This is documented in the Pin Names table (page 5) and Features list (page 1), and enables automated PCB interconnect testing during manufacturing and field diagnostics.