Renesas 70V659S10BF

Overview

70V659S10BF from IDT is a high-speed 128K × 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-processing buffers, and telecom packet buffering where simultaneous read/write to same memory location is required.

For engineers reviewing the 70V659S10BF datasheet, 70V659S10BF pinout, 70V659S10BF application, or 70V659S10BF equivalent, this page delivers verified package mapping (208-ball BGA, BF208), confirmed pin functions (e.g., CE0L/CE1L, BE0L–BE3L, SEM/INT/BUSY flags), on-chip semaphore arbitration logic, JTAG IEEE 1149.1 compliance, and industrial-grade timing parameters for master/slave cascading in 72-bit+ systems.

Technical Context

This device implements fully asynchronous dual-port SRAM architecture with separate address, control, and bidirectional I/O buses per port - enabling concurrent, independent access without internal synchronization overhead. It integrates hardware semaphore logic, BUSY/INT flag generation, and M/S-selectable arbitration for master/slave configurations in multi-device depth-expanded systems.

Each port supports independent power domains: fixed 3.3 V ±150 mV core (VDD) and configurable 3.3 V/2.5 V I/O (VDDQX) controlled by OPTL/OPTR inputs. Byte-enable granularity (four 9-bit bytes per port) allows precise data masking during multiplexed bus interfacing, while JTAG boundary-scan supports production testability per IEEE 1149.1.

Key Specifications

Pinout & Package

208-ball fine-pitch BGA (package code BF208), 15 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch. All VDD pins require connection to 3.3 V; VDDQ pins must match OPT pin selection (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 CY7C1362BV33-10BGXI and AS7C3256B-10TIN, the 70V659S10BF uniquely delivers per-port 2.5 V/3.3 V I/O configurability, integrated semaphore registers, and IEEE 1149.1 JTAG - making it the only choice for scalable, mixed-voltage, safety-aware dual-processor systems requiring hardware-coordinated memory access.

Availability

70V659S10BF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and avionics data acquisition requiring stable component supply, long-term lifecycle management, and traceable sourcing.

Supply support for 70V659S10BF 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 solutions, now part of Renesas Electronics.

The 70V659S10BF belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic inter-processor communication in real-time embedded systems where simultaneous access, hardware arbitration, and mixed-voltage interoperability are critical.

FAQ

What is the maximum operating frequency supported by the 70V659S10BF?

The 70V659S10BF does not operate on a clock; it is an asynchronous SRAM. Its performance is defined by access time: 10 ns maximum (tAA) under commercial conditions (0°C to +70°C, VDD = 3.3 V ±150 mV). This enables reliable interface with controllers running up to ~83 MHz effective bus rate, assuming proper setup/hold timing margins. The 70V659S10BF datasheet specifies tRC = 10 ns minimum read cycle time.

Does the 70V659S10BF support both 3.3 V and 2.5 V I/O voltages simultaneously on different ports?

Yes. The 70V659S10BF supports independent I/O voltage selection per port: OPTL sets left-port I/O voltage (3.3 V if tied to VDD, 2.5 V if tied to VSS), and OPTR sets right-port I/O voltage identically. This allows one port to interface with a 3.3 V FPGA while the other connects to a 2.5 V microcontroller - without external level shifters. The 70V659S10BF core remains at 3.3 V regardless.

How does the BUSY flag function in master versus slave configuration for the 70V659S10BF?

When M/S = VIH, the 70V659S10BF operates as Master: BUSYL/BUSYR are totem-pole outputs that assert high during arbitration contention (e.g., simultaneous write to same address). When M/S = VIL, it operates as Slave: BUSYL/BUSYR become inputs, allowing upstream master to block writes. The 70V659S10BF specification confirms BUSY is non-tri-state in both modes and has defined tBAA/tBDA timing for both configurations.

Can the 70V659S10BF be used in industrial temperature applications?

No - the 70V659S10BF is rated for commercial temperature range only (0°C to +70°C), as indicated by the "S10" speed grade suffix and confirmed in Table 4 of the datasheet. For industrial operation (–40°C to +85°C), the equivalent part is 70V659S12BF (12 ns access time). The 70V659S10BF's absolute maximum ratings and DC/AC specs are validated only across the commercial range.

What is the purpose of the semaphore feature in the 70V659S10BF, and how is it accessed?

The 70V659S10BF includes eight hardware semaphore flags for inter-port coordination. They are accessed by setting SEM = VIL and CE = VIH (opposite of RAM access), then using A0–A2 to select one of eight flags; I/O0 carries the data, while I/O1–I/O35 reflect the flag value. This enables lock-free resource sharing - for example, one port writes a flag to signal completion, and the other port reads it to initiate next-stage processing. The 70V659S10BF implements this entirely in hardware with no software overhead.