Renesas 70T633S10BFI8

Overview

70T633S10BFI8 from IDT (now Renesas) is a high-speed 512K × 18-bit asynchronous dual-port static RAM with independent left/right ports, 10 ns read cycle time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port-used in real-time inter-processor communication, FPGA co-processor buffering, and legacy bus arbitration systems.

For engineers reviewing the 70T633S10BFI8 datasheet, 70T633S10BFI8 pinout, 70T633S10BFI8 application, or 70T633S10BFI8 equivalent, key selection criteria include simultaneous dual-port access latency, RapidWrite Mode timing compliance, BUSY/INT flag behavior in MASTER/SLAVE cascading, and BGA-208 package thermal/power routing for industrial temperature operation.

Technical Context

This device implements true dual-port SRAM cells enabling concurrent read/write to the same address without contention. Its on-chip arbitration logic handles semaphore signaling, port synchronization, and automatic BUSY flag generation during address collisions-eliminating external glue logic in master/slave memory expansion.

It supports fully asynchronous operation per port with separate CE0/CE1, R/W, OE, UB/LB controls, and JTAG IEEE 1149.1 test access in BGA-208. The OPT pins independently configure each port's I/O voltage (2.5 V or 3.3 V), while ZZ sleep mode disables dynamic inputs except JTAG.

Key Specifications

Pinout & Package

70T633S10BFI8 is housed in a 208-ball fine-pitch BGA (package code BF208), with 15 mm × 15 mm body, 0.8 mm ball pitch, and standard ball layout supporting signal integrity for high-speed dual-port operation. Power and ground balls are distributed across the array to minimize noise coupling.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV18 and AS7C331620B, the 70T633S10BFI8 delivers superior real-time determinism via hardware BUSY arbitration and RapidWrite Mode, supports industrial temperature operation, and enables mixed-voltage system integration-making it optimal for safety-critical or high-throughput embedded systems.

Availability

70T633S10BFI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, FPGA co-processor buffering, and legacy bus arbitration systems requiring stable component supply, long-term lifecycle assurance, and industrial-grade reliability.

Supply support for 70T633S10BFI8 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, is a fabless semiconductor company specializing in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.

The 70T633S10BFI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor and FPGA-CPU data exchange in mission-critical embedded systems.

FAQ

What is the maximum operating frequency supported by the 70T633S10BFI8?

The 70T633S10BFI8 does not operate at a clock frequency-it is an asynchronous SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 10 ns, corresponding to an effective 100 MHz burst rate. Access times (tAA, tACE) are also rated at 10 ns max, enabling deterministic sub-10 ns latency for address-to-data valid transitions in properly terminated systems.

Does the 70T633S10BFI8 support both 2.5 V and 3.3 V I/O on the same device?

Yes-the 70T633S10BFI8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VDD (2.5 V) configures the left port for 3.3 V I/O (requiring VDDQL = 3.3 V), while OPTR = VSS (0 V) sets the right port to 2.5 V I/O (VDDQR = 2.5 V). This allows seamless interfacing between mixed-voltage subsystems without level shifters.

How does the BUSY flag function in MASTER/SLAVE configuration with the 70T633S10BFI8?

In MASTER mode (M/S = VIH), BUSYL/BUSYR are outputs that assert when the opposite port initiates a write to an address currently being read-preventing data corruption. In SLAVE mode (M/S = VIL), BUSY pins become inputs monitored by the MASTER to detect contention. This hardware handshake eliminates software polling and ensures atomic memory updates across ports.

What is RapidWrite Mode and how does it simplify system design for the 70T633S10BFI8?

RapidWrite Mode allows consecutive write operations without toggling R/W, CE, or byte-enable signals between cycles-the ending address transition defines the write boundary. This eliminates the need for precise narrow reset pulses, reduces controller timing complexity, and maintains full 10 ns write throughput. It requires meeting tAAS ≤ 1 ns and tARF ≥ 1.5 V/ns on address lines.

Is JTAG boundary scan supported on the 70T633S10BFI8, and which packages include it?

Yes-JTAG IEEE 1149.1 support is explicitly confirmed for the 70T633S10BFI8 in both BGA-208 (BF208) and BGA-256 packages, with dedicated TCK, TMS, TDI, TDO, and TRST pins. JTAG remains functional even during ZZ sleep mode, enabling in-system test and debug without waking the core logic.