Renesas 70V631S10BC

Overview

70V631S10BC from Integrated Device Technology (IDT) is a high-speed, fully asynchronous 256K × 18 dual-port static RAM with independent left/right ports, 10 ns max read cycle time, LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port-designed for real-time inter-processor communication in telecom line cards and industrial motion controllers.

For engineers reviewing the 70V631S10BC datasheet, 70V631S10BC pinout, 70V631S10BC application, or 70V631S10BC equivalent, this page delivers verified package mapping (128-pin TQFP), true dual-port arbitration logic, BUSY/INT semaphore signaling, JTAG exclusion confirmation, and industrial-grade timing specs aligned to IDT DSC-5622/9.

Technical Context

The 70V631S10BC implements fully independent asynchronous access on both ports with no shared clock, enabling simultaneous read/write to identical memory locations via on-chip arbitration. It supports MASTER/SLAVE cascading for 36-bit+ word systems using M/S pin control and automatic BUSY flag generation during address contention.

Each port features separate CE0/CE1 enables, R/W control, byte-select (UB/LB), output enable (OE), and dedicated OPT pins to configure I/O voltage independently at 3.3 V or 2.5 V-while maintaining fixed 3.3 V ±150 mV core supply (VDD). Semaphore and interrupt flags operate with deterministic setup/hold and pulse-width timing per IEEE 1149.1-compliant logic.

Key Specifications

Pinout & Package

70V631S10BC is housed in a 128-pin Thin Quad Flatpack (TQFP) package with 0.5 mm lead pitch and 14 mm × 20 mm footprint. All VDD pins require 3.3 V ±150 mV; VDDQ pins must match OPT pin state (3.3 V if OPT = VIH, 2.5 V if OPT = VIL); 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 AS7C3256B-10TIN, the 70V631S10BC uniquely delivers per-port I/O voltage configurability, hardware semaphore support, and MASTER/SLAVE cascading-all within a 128-pin TQFP package suitable for cost-sensitive, mixed-voltage embedded designs.

Availability

70V631S10BC is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and automotive ADAS applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for 70V631S10BC 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

Integrated Device Technology (IDT), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.

The 70V631S10BC belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where software-managed memory coherency is impractical.

FAQ

What is the maximum operating temperature range for the 70V631S10BC?

The 70V631S10BC is rated for commercial operation from 0°C to +70°C. It does not support the industrial –40°C to +85°C range-this capability is reserved for the 70V631S12BC variant. Thermal derating is not required within its specified ambient range, and all AC/DC parameters in the DSC-5622/9 datasheet apply strictly within this window.

Does the 70V631S10BC support JTAG boundary-scan testing?

No, the 70V631S10BC does not support JTAG. Although the device implements IEEE 1149.1-compliant logic internally, the 128-pin TQFP package (PKG128) lacks sufficient pins to route the required TMS, TCK, TDI, TDO, and TRST signals. JTAG is explicitly excluded for this package variant per Note 7 on page 3 of the datasheet.

How does the BUSY signal function in MASTER vs. SLAVE configuration on the 70V631S10BC?

When M/S = VIH, the 70V631S10BC operates as MASTER and asserts BUSY as an output flag during address contention; when M/S = VIL, it operates as SLAVE and accepts BUSY as an input to stall writes until the master releases the resource. This dual-role behavior is hardwired and requires no configuration register access.

Can both ports of the 70V631S10BC operate at different I/O voltages simultaneously?

Yes-the 70V631S10BC supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH and OPTR = VIL configures the left port for 3.3 V I/O and the right port for 2.5 V I/O, provided respective VDDQL and VDDQR supplies match those levels. This is confirmed in Pin Names table (page 5) and DC Operating Conditions (pages 7–8).

What is the purpose of the semaphore feature in the 70V631S10BC, and how is it accessed?

The 70V631S10BC includes eight hardware semaphore flags used for inter-port synchronization without CPU involvement. They are accessed by asserting CE = VIH and SEM = VIL while addressing A0–A2 (0–7), with data written to I/O0 and read from all I/O lines. This mechanism is detailed in Truth Table II (page 6) and enables lock-free coordination in real-time systems.