Renesas 70V658S10BFG

Overview

70V658S10BFG 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, FPGA co-processor buffering, and legacy bus arbitration systems.

For engineers reviewing the 70V658S10BFG datasheet, 70V658S10BFG pinout, 70V658S10BFG application, or 70V658S10BFG equivalent, this page delivers verified pin functions, dual-port arbitration timing, byte-enable granularity, JTAG 1149.1 compliance, and industrial-grade thermal validation for embedded memory subsystem design.

Technical Context

The 70V658S10BFG implements fully asynchronous dual-port operation with separate address, control, and I/O buses for left and right ports - 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, BUSY, and INT signals per port.

Port arbitration uses master/slave configuration (M/S pin) to resolve contention: when M/S = VIH, BUSYR/BUSYL are output flags indicating write conflict; when M/S = VIL, BUSYR/BUSYL become inputs for slave-side synchronization. Each port supports independent VDDQ selection (3.3 V or 2.5 V) and has four 9-bit byte enables (BE0–BE3) for fine-grained data masking.

Key Specifications

Pinout & Package

70V658S10BFG is packaged in a 208-ball fine-pitch BGA (BFG208), 15 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR voltage selection (3.3 V or 2.5 V); 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 CY7C1362BV33-10BGXI and AS7C362000B-10BIN, the 70V658S10BFG uniquely supports per-port I/O voltage selection and IEEE 1149.1 JTAG - critical for mixed-voltage FPGA/microcontroller integration and production test coverage in high-reliability systems.

Availability

70V658S10BFG is available at Aetrix Electronics and suitable for inter-processor communication, FPGA co-processor buffering, and real-time control system memory requiring stable component supply across commercial temperature grades.

Supply support for 70V658S10BFG 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 - acquired by Renesas in 2019.

The IDT70V65x family was designed for high-reliability dual-access memory applications in telecommunications infrastructure, military avionics, and industrial automation - emphasizing hardware arbitration, low-latency timing, and mixed-voltage interoperability.

FAQ

What is the maximum operating frequency supported by the 70V658S10BFG?

The 70V658S10BFG does not operate on a clock; it is an asynchronous dual-port SRAM. Its 10 ns access time (tAA) supports effective read/write cycles up to 100 MHz in burst-mode applications. Timing is governed by setup/hold relationships (e.g., tAS = 0 ns, tDH = 0 ns), not a system clock - enabling integration with non-synchronous buses like VME or custom FPGA interfaces. The 70V658S10BFG datasheet specifies tRC = 10 ns minimum read cycle time.

Does the 70V658S10BFG support both 3.3 V and 2.5 V I/O voltages simultaneously?

Yes - the 70V658S10BFG supports independent I/O voltage selection per port. OPTL and OPTR each control their respective port's I/O voltage: OPTL = VDD enables 3.3 V I/O on the left port; OPTR = VSS enables 2.5 V I/O on the right port. This allows direct connection to a 3.3 V microcontroller on one side and a 2.5 V FPGA on the other without external level shifters. Both VDDQL and VDDQR must be supplied at the selected voltage.

How does the BUSY signal function in master versus slave configuration on the 70V658S10BFG?

When M/S = VIH (master), BUSYL and BUSYR are totem-pole outputs that assert HIGH when the opposite port initiates a write to the same address - blocking further writes until cleared. When M/S = VIL (slave), BUSYL and BUSYR become inputs; the device waits for external assertion of BUSY before initiating its own write. In both cases, BUSY is non-tri-state and requires no pull-up; the 70V658S10BFG truth tables define exact timing windows (tBAA, tBDA) for assertion and deassertion.

Can the 70V658S10BFG be used for semaphore-based resource locking between dissimilar processors?

Yes - the 70V658S10BFG includes dedicated on-chip semaphore logic with eight flags accessible via A0–A2 and I/O0. Writing to I/O0 sets the flag; reading any I/O pin returns the flag state. Semaphore access requires CE = VIH and SEM = VIL (opposite of RAM access), and timing is validated down to tSOP = 4 ns (max). This enables lock-free coordination between ARM, DSP, and FPGA subsystems without software overhead or external latches.

What package type and dimensions does the 70V658S10BFG use?

The 70V658S10BFG uses a 208-ball fine-pitch BGA (package code BFG208), with 0.8 mm ball pitch and 15 mm × 15 mm footprint. Total height is 1.4 mm. Ball assignments follow the BF208 pinout diagram; VDD, VDDQL, VDDQR, and VSS balls are distributed across the array for optimal power delivery. Thermal pad is not present - thermal management relies on PCB copper pour and reflow profile optimization.