Renesas 70V658S12BFGI

Overview

70V658S12BFGI from IDT is a high-speed 64K × 36 asynchronous dual-port static RAM with independent left/right ports, 12 ns max access time (industrial grade), LVTTL-compatible I/Os supporting selectable 3.3 V or 2.5 V operation per port, and on-chip semaphore arbitration logic - used in real-time inter-processor communication buffers for telecom line cards and industrial motion controllers.

For engineers reviewing the 70V658S12BFGI datasheet, 70V658S12BFGI pinout, 70V658S12BFGI application, or 70V658S12BFGI equivalent, this page delivers verified electrical specs, port arbitration timing, byte-enable control behavior, JTAG IEEE 1149.1 compliance, and master/slave BUSY flag implementation details critical for deterministic dual-CPU memory sharing.

Technical Context

The 70V658S12BFGI implements true dual-port SRAM architecture with fully asynchronous, independent read/write access to the same memory location via separate address/control/I/O buses. Each port features dedicated chip enables (CE0/CE1), byte enables (BE0–BE3), output enable (OE), and R/W control, enabling concurrent operations without external arbitration logic.

On-chip semaphore logic supports eight shared flags accessible via A0–A2, with dedicated SEM pins and interrupt generation (INTL/INTR). The M/S pin configures BUSY as output (Master) or input (Slave), and JTAG boundary-scan (TMS/TCK/TDI/TDO/TRST) complies with IEEE 1149.1 for production testability.

Key Specifications

Pinout & Package

70V658S12BFGI is packaged in a 208-ball fine-pitch BGA (BFG208), 15 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch, with exposed thermal pad (not electrically connected). Pin functions are strictly segregated by port: left (L) and right (R) share no signal pins except power/ground.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-12BGXI, 70V658S12BFGI offers essential flexibility in I/O voltage configuration and production testability; compared with IDT70V659S12BFGI, it delivers optimal cost/performance for 64K-depth use cases without over-provisioning memory.

Availability

70V658S12BFGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data concentrators requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70V658S12BFGI 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 timing, memory interface, and RF solutions, now part of Renesas Electronics since 2019.

The IDT70V658 belongs to the high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where hardware arbitration and low-latency memory access are critical.

FAQ

What is the maximum operating temperature range for the 70V658S12BFGI?

The 70V658S12BFGI is rated for industrial temperature operation from −40°C to +85°C. This specification is validated across all electrical parameters including 12 ns access time, standby current (ISB3 ≤ 6 mA), and BUSY timing (tBAA ≤ 12 ns), making it suitable for deployment in uncontrolled environments such as factory floors and outdoor telecom cabinets.

Does the 70V658S12BFGI support JTAG boundary-scan testing?

Yes, the 70V658S12BFGI fully supports IEEE 1149.1 JTAG boundary-scan via dedicated TMS, TCK, TDI, TDO, and TRST pins. This enables structural test coverage during PCB assembly and facilitates in-system verification of interconnect integrity without requiring physical probe access - a key requirement for DO-254 and IEC 61508 certified designs.

How does the M/S pin affect BUSY functionality on the 70V658S12BFGI?

On the 70V658S12BFGI, the M/S pin configures BUSY behavior: when M/S = VIH, BUSYL/BUSYR are push-pull outputs asserting contention flags; when M/S = VIL, they become inputs accepting BUSY signals from another device. This enables flexible master/slave topologies in multi-SRAM systems without external logic - critical for scalable inter-processor arbitration.

Can both ports of the 70V658S12BFGI operate at different I/O voltages simultaneously?

Yes. The 70V658S12BFGI supports independent I/O voltage selection per port: OPTL sets left-port I/O levels (3.3 V or 2.5 V), and OPTR sets right-port levels. VDDQL and VDDQR must be supplied at the corresponding voltage. This allows direct interfacing to heterogeneous processors - e.g., a 3.3 V ARM host and 2.5 V FPGA accelerator - without level-shifting components.

What is the function of the BE0–BE3 pins on the 70V658S12BFGI?

The BE0–BE3 pins on the 70V658S12BFGI are byte enable controls that gate 9-bit segments of the 36-bit I/O bus: BE0 enables I/O0–I/O8, BE1 → I/O9–I/O17, BE2 → I/O18–I/O26, and BE3 → I/O27–I/O35. They allow partial-word writes without read-modify-write cycles - essential for efficient metadata updates in real-time communication buffers.