Renesas 70T633S12BFGI8

Overview

70T633S12BFGI8 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, 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 inter-processor communication systems requiring concurrent read/write access to shared memory.

For engineers reviewing the 70T633S12BFGI8 datasheet, 70T633S12BFGI8 pinout, 70T633S12BFGI8 application, or 70T633S12BFGI8 equivalent, key selection criteria include dual-port timing synchronization, BUSY/INT flag behavior in MASTER/SLAVE cascading, sleep mode current (≤10 mA), and VDDQ voltage configuration via OPTL/OPTR pins for mixed-voltage bus interfacing.

Technical Context

This device implements true dual-port SRAM architecture with fully asynchronous operation: each port has independent address, data, and control lines (CE0/CE1, R/W, OE, UB/LB), enabling simultaneous access to any memory location without contention. Port arbitration is handled entirely on-chip via BUSY flag signaling and semaphore logic.

RapidWrite Mode eliminates the need to toggle R/W between consecutive writes - address transition defines write cycle end, reducing system timing overhead. JTAG boundary scan support (TCK/TMS/TDI/TDO/TRST) is integrated and functional only in BGA-208 and BGA-256 packages, with dedicated TAP controller reset and test clock up to 10 MHz.

Key Specifications

Pinout & Package

70T633S12BFGI8 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 strictly segregated per port: left port (L) and right port (R) share no signal pins except ground (VSS), power (VDD, VDDQL, VDDQR), and JTAG/test pins.

Key Features

Applications

Equivalent & Alternatives

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

Compared with CY7C1362BV33-12BGXI and AS7C35128P-12TCN, the 70T633S12BFGI8 uniquely delivers true dual-port concurrency, hardware semaphore arbitration, and JTAG testability in a single 208-BGA package - eliminating external logic and reducing board area and BOM count in real-time embedded systems.

Availability

70T633S12BFGI8 is available at Aetrix Electronics and suitable for real-time inter-processor communication, telecom line card buffering, and avionics data concentrators requiring stable component supply, long-term lifecycle support, and industrial temperature qualification.

Supply support for 70T633S12BFGI8 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 70T633S12BFGI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory architectures in multi-processor systems where concurrent access and hardware-level arbitration are mandatory.

FAQ

What is the maximum operating temperature range for the 70T633S12BFGI8?

The 70T633S12BFGI8 is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all DC and AC electrical specifications including access time (12 ns max), standby current (ISB1 ≤145 mA), and sleep mode current (IZZ ≤20 mA). The device uses thermal characterization data from IDT's official datasheet DSC-5670/11 to guarantee performance under bias at the full range.

Does the 70T633S12BFGI8 support both 2.5 V and 3.3 V I/O interfaces simultaneously?

Yes, the 70T633S12BFGI8 supports mixed-voltage operation: OPTL and OPTR are independent inputs, allowing the left port to run at 2.5 V while the right port runs at 3.3 V (or vice versa). When OPTL = VSS, VDDQL must be 2.5 V; when OPTL = VDD, VDDQL must be 3.3 V - same applies to OPTR/VDDQR. This is confirmed in datasheet Table 5 and Note 3 on page 5.

How does the BUSY flag behave in Master vs Slave configuration for the 70T633S12BFGI8?

In Master configuration (M/S = VIH), BUSYL/BUSYR are outputs that assert low when the opposite port initiates a conflicting access to the same address. In Slave configuration (M/S = VIL), BUSYL/BUSYR become inputs used to detect contention - the external master drives the signal. This dual-role behavior is explicitly defined in datasheet Note 2 on page 5 and Truth Table I.

Is RapidWrite Mode supported across all speed grades of the 70T633S12BFGI8?

Yes, RapidWrite Mode is a functional feature available in all speed grades (10 ns, 12 ns, 15 ns), including the 70T633S12BFGI8. It requires meeting tAAS (≤1 ns address skew) and tARF (≥1.5 V/ns rise/fall) per datasheet Table 14. The mode simplifies controller design by removing R/W toggling - verified in Waveform 3 (Figure 8) and described on page 13 of DSC-5670/11.

Which JTAG signals are available and functional on the 70T633S12BFGI8 package?

The 70T633S12BFGI8 in BGA-208 package supports full IEEE 1149.1 JTAG: TCK (10 MHz max), TMS, TDI, TDO, and TRST (active-low reset). These pins are dedicated and non-multiplexed. JTAG is disabled in sleep mode (ZZ asserted), and boundary scan is not recommended during sleep per datasheet Note 4 on page 5.