Renesas 70T633S10BC8

Overview

70T633S10BC8 from Integrated Device Technology is a high-speed 512K × 18-bit asynchronous dual-port static RAM with true simultaneous access to the same memory location, 10 ns read cycle time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port. It supports RapidWrite Mode for back-to-back writes and on-chip semaphore arbitration-used in real-time inter-processor communication systems such as telecom line cards and industrial PLCs.

For engineers reviewing the 70T633S10BC8 datasheet, 70T633S10BC8 pinout, 70T633S10BC8 application, or 70T633S10BC8 equivalent, this page delivers verified specifications, BGA-256 package mapping, dual-port timing behavior, JTAG-compliant test support, and validated alternatives for memory expansion in deterministic multi-CPU architectures.

Technical Context

The 70T633S10BC8 implements fully asynchronous dual-port architecture with independent address, control, and data buses per port-enabling concurrent read/write operations without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag signaling and hardware semaphore registers accessible at A0–A2.

RapidWrite Mode eliminates R/W pulse requirements between consecutive writes by defining write end via address transition, reducing system timing overhead. The device supports Master/Slave cascading for 36-bit+ word width expansion using M/S pin and BUSY flag handshaking, with full JTAG (IEEE 1149.1) support in BGA-256 packaging.

Key Specifications

Pinout & Package

70T633S10BC8 is housed in a 256-ball fine-pitch Ball Grid Array (BGA) package with 1.0 mm ball pitch and 17 mm × 17 mm body size. Power distribution includes dedicated VDD (core), VDDQL/VDDQR (port-specific I/O), and VSS balls across the array; thermal management is supported by central VSS and VDD ball placement.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33 and 70V9269L15PF, the 70T633S10BC8 uniquely combines 10 ns speed, 2.5 V core efficiency, per-port I/O voltage selection, RapidWrite Mode, and IEEE 1149.1 JTAG - making it optimal for high-throughput, mixed-voltage, safety-critical dual-CPU designs.

Availability

70T633S10BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and test equipment requiring stable component supply, long-term lifecycle support, and traceable sourcing.

Supply support for 70T633S10BC8 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, specializes in high-performance timing, memory interface, and RF solutions for communications and computing markets.

The 70T633S10BC8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic inter-processor communication in real-time embedded systems demanding sub-10 ns latency and hardware arbitration.

FAQ

What is the maximum operating frequency supported by the 70T633S10BC8?

The 70T633S10BC8 does not operate at a fixed clock frequency but supports asynchronous operation with a 10 ns read cycle time (tRC), enabling effective throughput up to 100 MHz in burst-read scenarios. Its timing is defined by setup/hold and access parameters-not a system clock-making it compatible with variable-rate processors and FPGA interfaces without clock domain constraints. The 70T633S10BC8 maintains this performance across –40°C to +85°C.

Does the 70T633S10BC8 support both 2.5 V and 3.3 V I/O on the same device?

Yes-the 70T633S10BC8 supports independent I/O voltage selection per port via OPTL and OPTR pins. One port can operate at 2.5 V while the other runs at 3.3 V, allowing seamless interfacing with mixed-voltage SoCs or FPGAs. Core logic remains at 2.5 V regardless of I/O configuration. This capability is confirmed in the DC Operating Conditions tables for both VDDQ = 2.5 V and 3.3 V modes.

How does the RapidWrite Mode function in the 70T633S10BC8?

RapidWrite Mode in the 70T633S10BC8 allows consecutive write operations without toggling R/W, CE, or byte-enable signals-write termination is triggered by the next address transition instead of signal deassertion. This reduces control logic complexity and improves sustained write bandwidth. To use it, tAAS (≤1 ns) and tARF (≥1.5 V/ns) must be met; all standard write timing specs (tWC, tDW, tDH) still apply relative to the ending address edge.

Can the 70T633S10BC8 be used in Master/Slave configurations for wider data buses?

Yes-the 70T633S10BC8 supports Master/Slave cascading via the M/S pin: when M/S = VIH, BUSY is an output flag; when M/S = VIL, BUSY becomes an input. This enables depth expansion to 36-bit or wider word widths without external glue logic. Multiple devices synchronize via BUSY handshaking, ensuring error-free full-speed operation as documented in the IDT70T633/1 datasheet section "MASTER/SLAVE Dual-Port RAM Approach."

Is JTAG boundary-scan supported on the 70T633S10BC8, and under what conditions?

Yes-JTAG (IEEE 1149.1) is fully supported on the 70T633S10BC8 in its BGA-256 package, with dedicated TCK, TMS, TDI, TDO, and TRST pins. Boundary-scan remains functional even during sleep mode (ZZ asserted), though IDT recommends avoiding JTAG activity during sleep for reliability. JTAG operation requires VDD = 2.5 V and complies with 10 MHz TCK maximum frequency per the AC Electrical Characteristics table.