Renesas 70V659S10BF8

Overview

70V659S10BF8 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 OPTL/OPTR pins. It enables simultaneous read/write to the same memory location in telecom switching fabric and real-time DSP buffer applications.

For engineers reviewing the 70V659S10BF8 datasheet, 70V659S10BF8 pinout, 70V659S10BF8 application, or 70V659S10BF8 equivalent, key selection criteria include dual-port arbitration logic, on-chip semaphore signaling, JTAG IEEE 1149.1 compliance, 208-ball fine-pitch BGA package (15 mm × 15 mm), and industrial-grade timing support up to +85°C.

Technical Context

This device implements fully asynchronous operation from either port, with separate byte-enable controls (BE0–BE3 per port) supporting 9-bit byte granularity for multiplexed bus compatibility. Port arbitration is handled entirely on-chip via BUSY/INT flags and MASTER/SLAVE select (M/S pin), eliminating external logic for depth expansion.

It supports JTAG boundary-scan testing and provides hardware semaphore signaling across ports using I/O0–I/O35 for eight shared flags addressed by A0–A2. The core operates at 3.3 V ±150 mV while each port's I/O domain is independently configurable for 3.3 V (OPT = VDD) or 2.5 V (OPT = VSS), with corresponding VDDQL/VDDQR supplies.

Key Specifications

Pinout & Package

70V659S10BF8 is housed in a 208-ball fine-pitch BGA (package code BF208), with 15 mm × 15 mm body size, 0.8 mm ball pitch, and 1.4 mm height. Ball assignments follow standard IDT dual-port RAM layout with mirrored left/right I/O banks, dedicated control groups per port, and symmetric power/ground distribution.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C3128B-10BIN, the 70V659S10BF8 uniquely delivers per-port I/O voltage flexibility, hardware semaphore signaling, and JTAG testability in a compact 208-ball BGA-reducing BOM count and enabling higher-reliability real-time systems.

Availability

70V659S10BF8 is available at Aetrix Electronics and suitable for telecom switching fabric, industrial motion control, and avionics data acquisition requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 70V659S10BF8 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), now part of Renesas Electronics, specializes in high-performance timing, memory, and RF solutions for communications, computing, and industrial markets.

The 70V659S10BF8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems.

FAQ

What is the maximum operating frequency supported by the 70V659S10BF8?

The 70V659S10BF8 does not operate on a clock signal-it is an asynchronous device. Its performance is defined by access time: 10 ns maximum (tAA) for commercial-grade operation, enabling effective interfacing with 100 MHz bus controllers. Timing is governed by setup/hold relationships (e.g., tAS, tDH) rather than clock frequency.

How does the Master/Slave (M/S) pin affect BUSY flag behavior in the 70V659S10BF8?

When M/S = VIH, the 70V659S10BF8 operates as Master and asserts BUSYL/BUSYR as outputs to block conflicting writes on the opposite port. When M/S = VIL, it operates as Slave and accepts BUSY as inputs-requiring external coordination. This enables flexible arbitration topologies without additional logic.

Can both ports of the 70V659S10BF8 operate at different I/O voltages simultaneously?

Yes. The 70V659S10BF8 supports independent I/O voltage configuration: OPTL set to VDD enables 3.3 V I/O on the left port (VDDQL = 3.3 V), while OPTR set to VSS configures the right port for 2.5 V operation (VDDQR = 2.5 V). This allows direct interfacing with mixed-voltage ASICs or FPGAs.

What is the function of the semaphore logic in the 70V659S10BF8, and how is it accessed?

The 70V659S10BF8 includes an 8-bit hardware semaphore register addressed by A0–A2. Access occurs when CE = VIH and SEM = VIL (opposite of RAM access). I/O0 carries the semaphore value; I/O1–I/O35 reflect it during reads. This enables lock-free inter-port synchronization without software overhead or external latches.

Does the 70V659S10BF8 support JTAG boundary-scan, and what pins are required?

Yes, the 70V659S10BF8 fully complies with IEEE 1149.1. Required pins are TDI (pin A1), TDO (pin B1), TCK (pin T2), TMS (pin P3), and TRST (pin R3). These enable production test, board-level debug, and in-system verification without requiring additional test circuitry.