Renesas 70V657S12DRGI

Overview

70V657S12DRGI from IDT is a high-speed 32K × 36 asynchronous dual-port static RAM with true independent left/right ports, 12 ns max access time (commercial & industrial), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins. It enables simultaneous read/write to the same memory location in real-time control systems requiring deterministic arbitration.

For engineers reviewing the 70V657S12DRGI datasheet, 70V657S12DRGI pinout, 70V657S12DRGI application, or 70V657S12DRGI equivalent, this page delivers verified timing specs, port arbitration behavior, JTAG-compliant test interface support, and precise byte-enable–driven 9-bit-wide data access - critical for FPGA co-processor buffering, telecom packet switching, and industrial motion controller shared-memory designs.

Technical Context

The 70V657S12DRGI implements fully asynchronous dual-port operation with on-chip semaphore logic, automatic port arbitration, and MASTER/SLAVE configuration via M/S pin. Each port has independent CE0/CE1, R/W, OE, BE0–BE3, and address lines (A0–A14; A15/A16 are NC), enabling depth expansion without external logic.

It supports IEEE 1149.1 JTAG boundary-scan (TMS/TCK/TDI/TDO/TRST) and provides non-tri-state BUSY/INT flags. Power management includes four standby modes (ISB1–ISB4), with full CMOS-level standby current as low as 3 mA (typ) at 25°C.

Key Specifications

Pinout & Package

208-pin Plastic Quad Flatpack (PQFP), body size 28 mm × 28 mm × 3.5 mm, lead pitch 0.5 mm. All VDD pins require 3.3 V connection; VDDQL/VDDQR must match OPTL/OPTR selection (3.3 V or 2.5 V); all VSS pins tied to ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33 and R1EX24032AS0, the 70V657S12DRGI uniquely combines 12 ns asynchronous access, per-port 2.5 V/3.3 V I/O configurability, IEEE 1149.1 JTAG, and hardware semaphore - making it optimal for deterministic real-time embedded systems where voltage flexibility, testability, and contention-free concurrency are jointly required.

Availability

70V657S12DRGI is available at Aetrix Electronics and suitable for industrial motion control, telecom packet buffering, FPGA co-processor interfaces, avionics data acquisition, and real-time embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V657S12DRGI 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, specializes in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70V657S12DRGI belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic real-time systems requiring zero-software-overhead memory sharing between heterogeneous processors or logic domains.

FAQ

What is the maximum operating frequency supported by the 70V657S12DRGI?

The 70V657S12DRGI is an asynchronous device and does not operate from a clock signal; its performance is defined by access time (tAA = 12 ns max) and cycle time (tRC = 12 ns max). This enables deterministic timing without clock skew concerns - ideal for systems where CPU and FPGA operate on independent clocks. The 12 ns spec applies across the full industrial temperature range (–40°C to +85°C).

Does the 70V657S12DRGI support true simultaneous read/write to the same memory address?

Yes, the 70V657S12DRGI uses true dual-port SRAM cells that allow concurrent read and write operations to the identical memory location from left and right ports. This eliminates software locking and is essential for real-time inter-processor communication. The on-chip arbitration logic ensures data integrity via BUSY flag assertion when contention occurs.

How do the OPTL and OPTR pins configure I/O voltage levels on the 70V657S12DRGI?

On the 70V657S12DRGI, OPTL sets the left port's I/O voltage: VIH on OPTL selects 3.3 V operation (VDDQL = 3.3 V); VIL selects 2.5 V (VDDQL = 2.5 V). OPTR performs the same function independently for the right port. Both ports may operate at 3.3 V, both at 2.5 V, or one at each - enabling seamless interfacing with mixed-voltage SoCs or FPGAs.

What is the role of the M/S pin in 70V657S12DRGI system design?

The M/S pin configures the 70V657S12DRGI as either Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL/BUSYR are totem-pole outputs indicating port contention; in Slave mode, they become inputs accepting BUSY signals from another device. This enables cascaded 72-bit+ memory systems without external logic - critical for scalable high-bandwidth buffer architectures.

Is JTAG boundary-scan supported on the 70V657S12DRGI, and what standards does it comply with?

Yes, the 70V657S12DRGI fully supports IEEE 1149.1 JTAG boundary-scan via dedicated TMS, TCK, TDI, TDO, and TRST pins. It enables production test, in-system debug, and verification of PCB interconnects without requiring functional access to the memory array - a key requirement for high-reliability industrial and aerospace applications using the 70V657S12DRGI.