Renesas 70V658S10BF

Overview

70V658S10BF from IDT is a high-speed 64K × 36 asynchronous dual-port static RAM with true independent left/right ports, 10 ns max access time (commercial grade), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins - used in real-time inter-processor communication buffers and FPGA co-processor memory interfaces.

For engineers reviewing the 70V658S10BF datasheet, 70V658S10BF pinout, 70V658S10BF application, or 70V658S10BF equivalent, this page delivers verified electrical specs, dual-port arbitration behavior, JTAG-compliant test interface support, byte-enable granularity for 9-bit data lanes, and industrial-grade thermal validation up to +85°C.

Technical Context

The 70V658S10BF implements fully asynchronous dual-port operation: each port has independent address, control, and bidirectional I/O buses (I/O0L–I/O35L and I/O0R–I/O35R), enabling simultaneous read/write to the same memory location without external arbitration logic. Its on-chip semaphore logic supports eight shared flags accessed via A0–A2, with dedicated SEM and BUSY signaling.

Port arbitration uses master/slave configuration via M/S pin: when M/S = VIH, BUSYR/BUSYL are output flags indicating contention; when M/S = VIL, BUSYR/BUSYL become inputs for slave-side synchronization. The device supports depth expansion via dual CE enables and width expansion to ≥72 bits using cascaded MASTER/SLAVE mode with IDT70V659/57.

Key Specifications

Pinout & Package

70V658S10BF is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size ≈28 mm × 28 mm × 3.5 mm, with 0.5 mm lead pitch. All VDD pins require 3.3 V connection; VDDQ pins must match OPT pin selection (3.3 V if OPT = VDD, 2.5 V if OPT = VSS); all VSS pins connect 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 IS61WV6432ALL, the 70V658S10BF uniquely delivers per-port 2.5 V/3.3 V I/O flexibility, integrated semaphore and BUSY arbitration, and production-ready JTAG - making it the only choice for safety-critical, mixed-supply, or high-assurance dual-processor systems.

Availability

70V658S10BF is available at Aetrix Electronics and suitable for real-time inter-processor communication, FPGA co-processor buffering, and industrial PLC memory expansion requiring stable component supply across long production lifecycles.

Supply support for 70V658S10BF 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, RF, and sensor signal conditioning ICs, now part of Renesas Electronics since 2019.

The IDT70V65x family was designed specifically for high-reliability dual-processor and FPGA-ASIC bridging applications demanding deterministic arbitration, low-latency memory access, and mixed-voltage interoperability - targeting aerospace, industrial automation, and medical imaging systems.

FAQ

What is the maximum operating frequency supported by the 70V658S10BF?

The 70V658S10BF does not operate on a clock; it is an asynchronous SRAM. Its performance is defined by access time: tAA ≤ 10 ns (max), enabling reliable operation in systems with read cycles as short as 10 ns. This corresponds to an effective bandwidth of ~3.6 Gbps for full 36-bit reads, assuming no bus turnaround overhead.

Does the 70V658S10BF support both 2.5 V and 3.3 V I/O on the same device?

Yes - the 70V658S10BF supports independent I/O voltage selection per port: OPTL controls left-port I/O voltage (3.3 V or 2.5 V), and OPTR controls right-port I/O voltage. This allows one port to interface with a 2.5 V FPGA bank while the other connects to a 3.3 V microcontroller, without level shifters.

How does the BUSY flag function in master vs. slave configuration for the 70V658S10BF?

When M/S = VIH, the 70V658S10BF operates as master: BUSYL and BUSYR are active-high output flags asserting during address contention. When M/S = VIL, it operates as slave: BUSYL and BUSYR become inputs, allowing external master to control write gating - enabling hierarchical arbitration in multi-device systems.

Can the 70V658S10BF be used in industrial temperature environments?

No - the 70V658S10BF is rated for commercial temperature range only (0°C to +70°C). Industrial-grade variants exist in the same family (e.g., 70V658S12BF), but the S10 speed grade is explicitly commercial-only per datasheet Table 10 and ordering information.

What is the purpose of the SEM pin on the 70V658S10BF, and how is it used?

The SEM pin (Semaphore Enable) on the 70V658S10BF enables access to the eight on-chip semaphore flags. When SEM = VIL and CE = VIH, A0–A2 address one of eight flags; I/O0 carries the flag value, and I/O1–I/O35 reflect the same value. This provides hardware-accelerated, atomic resource locking between ports without software intervention.