Renesas 70T633S12BFGI

Overview

70T633S12BFGI from IDT (now Renesas) is a high-speed 512K × 18-bit asynchronous dual-port static RAM with independent left/right ports, 12 ns max access time, single 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port. It supports RapidWrite Mode, on-chip semaphore arbitration, and JTAG IEEE 1149.1 compliance in BGA-208 packaging - used in real-time interprocessor communication, FPGA co-processing, and legacy bus bridging systems.

For engineers reviewing the 70T633S12BFGI datasheet, 70T633S12BFGI pinout, 70T633S12BFGI application, or 70T633S12BFGI equivalent, key selection criteria include dual-port timing independence, BUSY/INT flag behavior in MASTER/SLAVE cascading, sleep-mode current (≤10 mA), VDDQ voltage configuration via OPT pins, and BGA-208 mechanical compatibility with industrial temperature operation (–40°C to +85°C).

Technical Context

This device implements true dual-port SRAM architecture with fully asynchronous read/write operations on each port, enabling simultaneous access to the same memory location without external arbitration logic. Port arbitration is handled internally via dedicated BUSY/INT/SEM signals and M/S-selectable master/slave mode for depth expansion.

RapidWrite Mode eliminates R/W pulse toggling between consecutive writes by defining write termination on address transition - requiring strict control of address skew (tAAS ≤ 1 ns) and rise/fall rate (tARF ≥ 1.5 V/ns). JTAG boundary scan operates independently of sleep mode but must be disabled during ZZ assertion.

Key Specifications

Pinout & Package

70T633S12BFGI is packaged in a 208-ball fine-pitch Ball Grid Array (BGA), 15 mm × 15 mm × 1.4 mm body, 0.8 mm ball pitch. Pin functions are asymmetrically distributed across left (L) and right (R) ports with dedicated control, address, data, and arbitration signals.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-12BGXI and 70V9279L12PFGI, the 70T633S12BFGI uniquely combines 2.5 V core + configurable I/O voltage, RapidWrite Mode, IEEE 1149.1 JTAG, and integrated semaphore arbitration - making it optimal for heterogeneous, real-time, and debug-aware embedded systems.

Availability

70T633S12BFGI is available at Aetrix Electronics and suitable for real-time interprocessor communication, FPGA co-processing buffers, and legacy bus bridging applications requiring stable component supply, long-term industrial temperature support, and verified dual-port timing performance.

Supply support for 70T633S12BFGI 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, computing, and industrial markets.

The 70T633S12BFGI belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor data exchange in mission-critical embedded systems where software arbitration introduces unacceptable jitter or overhead.

FAQ

What is the maximum operating temperature range supported by the 70T633S12BFGI?

The 70T633S12BFGI is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including 12 ns access time, standby current (ISB1 ≤ 145 mA), and sleep mode current (IZZ ≤ 20 mA), ensuring reliable performance in enclosed or thermally stressed environments such as base station line cards and motor control cabinets.

How does the RapidWrite Mode function in the 70T633S12BFGI, and what timing constraints apply?

RapidWrite Mode in the 70T633S12BFGI allows consecutive write operations without toggling R/W, CE, or byte-enable signals - write termination is defined by address transition instead of control signal deassertion. To use this mode, address skew (tAAS) must not exceed 1 ns and address rise/fall rate (tARF) must be ≥1.5 V/ns. These constraints prevent spurious writes during transitions and are mandatory for guaranteed operation at 12 ns cycle time.

Can the left and right ports of the 70T633S12BFGI operate at different I/O voltages simultaneously?

Yes - the 70T633S12BFGI supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VSS configures the left port for 2.5 V operation (VDDQL = 2.5 V), while OPTR = VDD configures the right port for 3.3 V (VDDQR = 3.3 V). This enables direct interfacing between mixed-voltage subsystems without external level shifters, provided VDD remains at 2.5 V for the core.

What is the role of the M/S pin in 70T633S12BFGI cascaded configurations?

In cascaded configurations, the M/S pin determines BUSY signal direction: when M/S = VIH, the device acts as Master and asserts BUSYR/BUSYL as outputs to indicate port contention; when M/S = VIL, it acts as Slave and accepts BUSY as an input. This enables automatic hardware flow control across multiple devices in 36-bit-or-wider memory systems without external logic or software intervention.

Does the 70T633S12BFGI support JTAG boundary scan, and under what conditions?

Yes - the 70T633S12BFGI supports IEEE 1149.1 JTAG boundary scan in its BGA-208 package (70T633S12BFGI), with dedicated TCK, TMS, TDI, TDO, and TRST pins. JTAG remains functional during normal operation but is not recommended during sleep mode (ZZ asserted), as boundary-scan logic may behave unpredictably. JTAG operates at up to 10 MHz and is independent of memory access timing.