Renesas 70T633S10BFG

Overview

70T633S10BFG 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. It enables simultaneous access to the same memory location and supports MASTER/SLAVE cascading for 36-bit+ bus expansion in real-time inter-processor communication systems.

For engineers reviewing the 70T633S10BFG datasheet, 70T633S10BFG pinout, 70T633S10BFG application, or 70T633S10BFG equivalent, key selection criteria include true dual-port arbitration logic, RapidWrite Mode for back-to-back writes, JTAG IEEE 1149.1 compliance in BGA-256, industrial temperature support (–40°C to +85°C), and sleep mode current as low as 2 mA.

Technical Context

This device implements fully asynchronous operation from either port with on-chip port arbitration, semaphore signaling, and BUSY/INT flag generation. Its dual chip enable architecture allows depth expansion without external logic, while Master/Slave select (M/S) configures BUSY as input (Slave) or output (Master).

The RapidWrite Mode eliminates R/W pulse requirements between consecutive writes by defining write end via address transition-reducing timing complexity at 10 ns cycle times. Each port supports independent I/O voltage selection (2.5 V or 3.3 V) via OPT pins, with dedicated VDDQ supplies and separate byte controls (UB/LB) for bus matching.

Key Specifications

Pinout & Package

70T633S10BFG is packaged in a 256-ball fine-pitch Ball Grid Array (BGA) with 1.0 mm ball pitch and 17 mm × 17 mm body size. All VDD pins require 2.5 V; VDDQ pins must match OPT pin state (3.3 V if OPT = VDD, 2.5 V if OPT = VSS). VSS pins are ground-connected.

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 70T633S10BFG uniquely delivers 2.5 V core efficiency, hardware semaphore support, and RapidWrite Mode - making it irreplaceable for deterministic real-time inter-processor communication where latency, power, and synchronization integrity are critical.

Availability

70T633S10BFG is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, broadcast video systems, and avionics data concentrators requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.

Supply support for 70T633S10BFG 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 leader in high-performance memory and interface solutions for communications, computing, and industrial markets.

The 70T633S10BFG belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for real-time inter-processor communication, FPGA co-processing, and deterministic data buffering in mission-critical embedded systems.

FAQ

What is the maximum operating frequency supported by the 70T633S10BFG?

The 70T633S10BFG does not operate on a clock signal-it is an asynchronous device. Its performance is defined by timing parameters: 10 ns maximum read cycle time (tRC), 10 ns maximum address access time (tAA), and 10 ns maximum write cycle time (tWC). These values enable reliable operation with processors and FPGAs running at effective throughputs up to 100 MHz in burst mode, assuming proper board layout and signal integrity.

Does the 70T633S10BFG support both 2.5 V and 3.3 V I/O on the same device?

Yes-the 70T633S10BFG supports mixed-voltage operation: OPTL and OPTR pins independently configure the left and right ports for either 2.5 V or 3.3 V I/O levels. When OPTL = VSS, left-port I/Os run at 2.5 V (VDDQL = 2.5 V); when OPTL = VDD, they run at 3.3 V (VDDQL = 3.3 V). The same applies to the right port. Core supply (VDD) remains fixed at 2.5 V.

How does the RapidWrite Mode function in the 70T633S10BFG?

RapidWrite Mode in the 70T633S10BFG allows consecutive write operations without toggling R/W, CE, or byte-enable signals between cycles. The write cycle ends on the *address transition*, not the R/W deassertion. This eliminates narrow pulse generation challenges at 10 ns timing, simplifies FPGA logic, and maintains full bandwidth during burst writes-provided tAAS ≤ 1 ns and tARF ≥ 1.5 V/ns are met.

Is JTAG boundary scan available on all 70T633S10BFG packages?

No-JTAG IEEE 1149.1 support is available only in the BGA-256 package (e.g., 70T633S10BFG). It is not implemented in the BGA-208 variant. Pins TCK, TMS, TDI, TDO, and TRST are present and functional only in the 256-ball version, enabling in-system testability and debug without additional hardware.

What is the role of the M/S pin in 70T633S10BFG system design?

The M/S (Master/Slave Select) pin configures BUSY behavior and arbitration priority: when M/S = VIH, BUSY is an output indicating port contention; when M/S = VIL, BUSY is an input accepting arbitration signals from a master device. This enables cascaded configurations-for example, two 70T633S10BFG devices can be combined into a 36-bit-wide memory with one acting as Master and the other as Slave.