Renesas 70T633S10BF8

Overview

70T633S10BF8 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 max read cycle time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port. It enables full-speed 36-bit+ memory expansion via MASTER/SLAVE cascading in industrial networking and real-time control systems.

For engineers reviewing the 70T633S10BF8 datasheet, 70T633S10BF8 pinout, 70T633S10BF8 application, or 70T633S10BF8 equivalent, key selection criteria include dual-port arbitration logic, RapidWrite Mode timing compliance, BUSY/INT flag behavior in MASTER vs SLAVE configuration, and BGA-208 package thermal-mechanical constraints for high-density PCB layout.

Technical Context

This device implements fully asynchronous operation from either port with independent CE0/CE1, R/W, OE, UB/LB controls per side. On-chip port arbitration resolves contention using hardware semaphore signaling across eight flags addressed by A0–A2, with dedicated SEM, BUSY, and INT pins per port.

It supports JTAG IEEE 1149.1 boundary scan in BGA-208 and BGA-256 packages, and includes sleep mode (ZZL/ZZR) that disables dynamic inputs while preserving JTAG functionality. Core voltage is fixed at 2.5 V ±100 mV; I/O voltage per port is selected independently via OPTL/OPTR pins and corresponding VDDQL/VDDQR supplies.

Key Specifications

Pinout & Package

70T633S10BF8 is housed in a 208-ball fine-pitch Ball Grid Array (BF208) package with 0.8 mm ball pitch and 15 mm × 15 mm footprint. All VDD pins require 2.5 V; VDDQL/VDDQR must match OPTL/OPTR selection (2.5 V if OPT = VSS, 3.3 V if OPT = VDD).

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10BGXI and AS7C331024B-10BIN, the 70T633S10BF8 uniquely integrates per-port I/O voltage flexibility, hardware semaphore arbitration, and RapidWrite Mode-enabling simpler, higher-performance dual-processor architectures without discrete glue logic or timing-critical firmware workarounds.

Availability

70T633S10BF8 is available at Aetrix Electronics and suitable for industrial automation, telecom infrastructure, avionics data concentrators, and medical imaging systems requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70T633S10BF8 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 70T633S10BF8 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 where hardware-coordinated memory access is essential.

FAQ

What is the maximum operating frequency supported by the 70T633S10BF8?

The 70T633S10BF8 does not operate from a clock signal-it is an asynchronous device. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 10 ns, translating to an effective throughput of up to 100 million reads per second under ideal conditions. Actual system speed depends on address setup/hold, CE assertion, and bus loading-not a fixed clock frequency.

Does the 70T633S10BF8 support both 2.5 V and 3.3 V I/O on the same device?

Yes-the 70T633S10BF8 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, provided VDDQL and VDDQR supplies match the respective OPT settings. This eliminates external level shifters in mixed-voltage designs.

How does the BUSY flag function in MASTER versus SLAVE configuration for the 70T633S10BF8?

When M/S = VIH, BUSYL/BUSYR are outputs indicating port contention during concurrent access. When M/S = VIL, they become inputs-allowing a slave device to accept BUSY assertions from its master. This bidirectional capability is essential for hierarchical arbitration in cascaded multi-device memory systems.

Can the 70T633S10BF8 be used without JTAG functionality?

Yes-JTAG pins (TCK, TMS, TDI, TDO, TRST) are optional. The 70T633S10BF8 operates fully without boundary scan enabled. However, JTAG remains accessible for in-system test and debug if required; it functions independently of sleep mode (ZZL/ZZR) and does not interfere with normal memory operation.

What is the purpose of RapidWrite Mode in the 70T633S10BF8, and how is it enabled?

RapidWrite Mode allows consecutive write operations without toggling R/W or CE between cycles-the ending address transition defines the write boundary. It is inherently active when R/W and CE remain asserted across address changes. Designers must meet tAAS (≤1 ns address skew) and tARF (≥1.5 V/ns slew) to prevent spurious writes; no register setting or pin strap is required.