Renesas 70T633S10BCGI

Overview

70T633S10BCGI 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-designed for real-time inter-processor communication in telecom line cards and industrial motion controllers.

For engineers reviewing the 70T633S10BCGI datasheet, 70T633S10BCGI pinout, 70T633S10BCGI application, or 70T633S10BCGI equivalent, key selection criteria include true simultaneous dual-port access, on-chip semaphore arbitration, RapidWrite Mode for back-to-back writes, JTAG IEEE 1149.1 support, and industrial-grade temperature operation up to +85°C.

Technical Context

This device implements fully asynchronous dual-port architecture with separate address, control, and data buses per port, enabling concurrent read/write operations to the same memory location without external arbitration logic. It integrates on-chip port arbitration, BUSY/INT flag generation, and hardware semaphore signaling compliant with IEEE 1149.1 in BGA packages.

The 70T633S10BCGI supports mixed-voltage I/O via independent OPTL/OPTR pins-each port configurable for either 2.5 V or 3.3 V signaling-and includes Sleep Mode (ZZL/ZZR) that disables dynamic inputs while preserving JTAG functionality. RapidWrite Mode eliminates R/W pulsing between consecutive writes by defining write end on address transition.

Key Specifications

Pinout & Package

70T633S10BCGI is housed in a 256-ball fine-pitch Ball Grid Array (BGA) package with 1.0 mm ball pitch, 17 mm × 17 mm body size, and 1.4 mm height. All VDD pins require 2.5 V; VDDQ pins must match OPT pin configuration (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 CY7C1365KV18-100BZI and AS7C35128P-10BIN, the 70T633S10BCGI uniquely delivers true asynchronous dual-port operation with integrated hardware semaphores and mixed-voltage I/O-making it irreplaceable in legacy or mixed-signal systems requiring zero-software-coordination memory sharing.

Availability

70T633S10BCGI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle support, and RoHS-compliant green packaging.

Supply support for 70T633S10BCGI 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 interface, and RF solutions for communications and computing markets.

The 70T633S10BCGI belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic inter-processor communication in real-time embedded systems where latency, reliability, and mixed-voltage interoperability are critical.

FAQ

What is the maximum operating frequency supported by the 70T633S10BCGI?

The 70T633S10BCGI supports a 10 ns read cycle time (tRC), enabling sustained 100 MHz operation under commercial and industrial temperature ranges. This is a guaranteed maximum-not a typical value-and applies to both ports simultaneously with full address and data validity. The device does not use a clock input; timing is purely asynchronous and governed by tRC, tAA, and tACE specifications in the datasheet.

Does the 70T633S10BCGI support mixed-voltage operation between its two ports?

Yes, the 70T633S10BCGI supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VSS configures the left port for 2.5 V I/O levels (with VDDQL = 2.5 V), while setting OPTR = VDD configures the right port for 3.3 V I/O levels (with VDDQR = 3.3 V). This allows seamless interfacing with heterogeneous 2.5 V and 3.3 V ASICs or FPGAs without level shifters.

How does the RapidWrite Mode function in the 70T633S10BCGI?

RapidWrite Mode in the 70T633S10BCGI allows consecutive write operations without toggling R/W, CE, or byte-enable signals between cycles. Instead, the write cycle ends on the falling edge of the address bus (tWC referenced to address transition). This reduces controller timing overhead and eliminates narrow pulse generation-critical for achieving reliable 10 ns back-to-back writes in FPGA- or ASIC-based systems.

Is JTAG boundary scan supported on the 70T633S10BCGI, and what package options include it?

Yes, the 70T633S10BCGI supports full IEEE 1149.1 JTAG boundary scan, including TCK, TMS, TDI, TDO, and TRST pins. This feature is implemented only in the BGA-256 (BC256/BCG256) and BGA-208 (BF208/BFG208) packages-verified in the functional block diagram and pin configuration diagrams. The 70T633S10BCGI uses the BGA-256 package, which includes all five JTAG signals.

What is the role of the M/S pin in the 70T633S10BCGI, and how does it affect BUSY functionality?

The M/S (Master/Slave Select) pin configures BUSY behavior: when M/S = VIH, BUSYL/BUSYR act as totem-pole outputs indicating local port contention; when M/S = VIL, BUSYL/BUSYR become inputs for daisy-chained arbitration in MASTER/SLAVE configurations. This enables scalable 36-bit+ word systems using multiple 70T633S10BCGI devices without external logic-per the IDT MASTER/SLAVE Dual-Port RAM architecture.