Renesas 70V658S15BF8

Overview

70V658S15BF8 from IDT is a high-speed 64K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 15 ns maximum access time, LVTTL-compatible 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, FPGA co-processor buffering, and legacy bus bridging where simultaneous read/write to shared memory is required.

For engineers reviewing the 70V658S15BF8 datasheet, 70V658S15BF8 pinout, 70V658S15BF8 application, or 70V658S15BF8 equivalent, this page delivers verified specifications, validated pin functions, confirmed industrial-grade temperature support (–40°C to +85°C), exact package mapping (208-ball fine-pitch BGA), and two rigorously cross-checked alternative parts for system-level design continuity.

Technical Context

This device implements true dual-port SRAM architecture with fully asynchronous operation on both ports, on-chip arbitration logic, and hardware semaphore signaling across ports. It supports MASTER/SLAVE cascading for 72-bit+ data width expansion without external logic.

Each port features independent chip enables (CE0/CE1), byte enables (BE0–BE3) for 9-bit granularity, separate R/W and OE controls, and configurable I/O voltage via OPTL/OPTR pins - enabling mixed-voltage interfacing between 3.3 V and 2.5 V subsystems while maintaining 3.3 V core operation.

Key Specifications

Pinout & Package

208-ball fine-pitch BGA (package code BF208), 15 mm × 15 mm body, 0.8 mm ball pitch, 1.4 mm height. All VDD pins require 3.3 V; VDDQ pins must match OPT pin state (3.3 V if OPT = VDD, 2.5 V if OPT = VSS); all VSS pins grounded.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33 and R1EX24064ASG, the 70V658S15BF8 uniquely combines per-port I/O voltage flexibility, hardware semaphore support, and IEEE 1149.1 JTAG - making it the only option for industrial systems requiring mixed-voltage interoperability and lock-free inter-processor synchronization in a 208-ball BGA.

Availability

70V658S15BF8 is available at Aetrix Electronics and suitable for industrial motor control, FPGA co-processing, and telecom line card buffering requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70V658S15BF8 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 semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT70V65x family was designed for high-reliability, real-time inter-processor communication in industrial automation, aerospace, and telecom infrastructure - emphasizing deterministic timing, hardware arbitration, and mixed-voltage compatibility.

FAQ

What is the maximum operating temperature range supported by the 70V658S15BF8?

The 70V658S15BF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is confirmed in the Absolute Maximum Ratings and Recommended Operating Conditions tables of the official IDT datasheet (document 4869, Rev. Aug.23.21), and applies to all speed grades including the S15 variant denoted in the part number.

Does the 70V658S15BF8 support both 3.3 V and 2.5 V I/O interfaces simultaneously?

Yes - the 70V658S15BF8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL=VDD configures the left port for 3.3 V I/O (with VDDQL=3.3 V), while OPTR=VSS configures the right port for 2.5 V I/O (with VDDQR=2.5 V). This capability is explicitly documented in Pin Names Table (4869 tbl 01) and DC Operating Conditions (4869 tbl 06–07).

Is A16 used as an address pin on the 70V658S15BF8?

No - A16L and A16R are No Connect (NC) pins for the 70V658S15BF8, as confirmed in multiple notes across the datasheet: "A16 is a NC for IDT70V658" (page 1, note 1), repeated in Pin Configuration diagrams (pages 2–4), and Pin Names table (page 5, note 3). This limits the addressable depth to 64K (A0–A15).

How does the BUSY signal function in Master vs. Slave configuration on the 70V658S15BF8?

When M/S = VIH, BUSYL/BUSYR operate as totem-pole outputs indicating port contention; when M/S = VIL, BUSYL/BUSYR become inputs accepting busy signals from upstream masters. This dual-mode behavior is defined in datasheet notes (page 1, note 2; page 5, note 4) and enables flexible daisy-chained arbitration topologies without external logic.

What package type is used for the 70V658S15BF8, and is it pin-compatible with other IDT70V65x devices?

The 70V658S15BF8 uses a 208-ball fine-pitch BGA (package code BF208, 15 mm × 15 mm, 0.8 mm pitch), as shown in the Pin Configuration diagram on page 4. It shares identical pinout and ball map with IDT70V659S15BF8 and IDT70V657S15BF8 - confirmed by side-by-side comparison of BF208 drawings and pin name tables across the family datasheet.