Renesas 70T633S10BFI

Overview

70T633S10BFI 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 in real-time inter-processor communication systems.

For engineers reviewing the 70T633S10BFI datasheet, 70T633S10BFI pinout, 70T633S10BFI application, or 70T633S10BFI equivalent, key selection criteria include true dual-port arbitration logic, RapidWrite Mode for back-to-back writes, JTAG IEEE 1149.1 support, industrial temperature range (–40°C to +85°C), and BGA-256 package compatibility.

Technical Context

This device implements fully asynchronous operation from either port with on-chip port arbitration, semaphore signaling, and BUSY flag handshake for conflict resolution. It supports MASTER/SLAVE cascading for 36-bit+ word systems using M/S pin control and dual chip enables (CE0/CE1) for depth expansion without external logic.

RapidWrite Mode eliminates R/W pulse requirement between consecutive writes by defining write end via address transition-reducing timing complexity at 10 ns cycle times. Each port independently selects I/O voltage (2.5 V or 3.3 V) via OPTL/OPTR pins, while core VDD remains fixed at 2.5 V ±100 mV.

Key Specifications

Pinout & Package

256-ball fine-pitch Ball Grid Array (BGA) package, body size 17 mm × 17 mm × 1.4 mm, 1.0 mm ball pitch. All VDD pins require 2.5 V supply; VDDQ pins must match selected I/O voltage (2.5 V or 3.3 V) per port based on OPTL/OPTR state.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-10ZXC and AS7C331024B-10BIN, the 70T633S10BFI uniquely delivers true dual-port operation with on-chip arbitration, RapidWrite Mode, and per-port I/O voltage flexibility - critical for deterministic real-time inter-processor communication.

Availability

70T633S10BFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, avionics, and radar signal processing requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for 70T633S10BFI 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

Renesas Electronics Corporation (formerly IDT) is a global semiconductor leader specializing in microcontrollers, analog, power management, and memory solutions for industrial, automotive, and communications markets.

The 70T633S10BFI belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic real-time data exchange between heterogeneous processors in mission-critical embedded systems.

FAQ

What is the maximum operating frequency supported by the 70T633S10BFI?

The 70T633S10BFI does not operate on a clock signal-it is an asynchronous SRAM. Its performance is specified by access timing: 10 ns maximum read cycle time (tRC), 10 ns address access time (tAA), and 10 ns write cycle time (tWC). These parameters define the minimum interval between successive memory operations under worst-case conditions.

Does the 70T633S10BFI support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes-the 70T633S10BFI supports independent I/O voltage selection per port. OPTL configures the left port for 2.5 V or 3.3 V operation, and OPTR does the same for the right port. This allows one port to interface with a 2.5 V FPGA while the other connects to a 3.3 V microcontroller, provided corresponding VDDQL/VDDQR supplies are applied.

How does the RapidWrite Mode function in the 70T633S10BFI?

RapidWrite Mode in the 70T633S10BFI allows consecutive write operations without toggling R/W, CE, or byte-enable signals between cycles. The write cycle ends on the address transition rather than signal deassertion. This reduces timing constraints and simplifies high-speed controller design-especially valuable at the 10 ns cycle specification of the 70T633S10BFI.

What is the role of the M/S pin in the 70T633S10BFI?

The M/S (Master/Slave) pin determines BUSY pin behavior and enables cascaded memory configurations. When M/S = VIH, BUSY is an output indicating port contention; when M/S = VIL, BUSY is an input for slave-side arbitration. Cascading multiple 70T633S10BFI devices using M/S allows building 36-bit or wider memory systems without external logic.

Is JTAG boundary-scan supported on the 70T633S10BFI, and under what conditions?

Yes-JTAG boundary-scan per IEEE 1149.1 is supported on the 70T633S10BFI in both BGA-208 and BGA-256 packages. It remains functional during normal operation and standby modes but is not recommended during sleep mode (ZZ asserted), as dynamic inputs-including JTAG-are disabled except for initialization reset (TRST).