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Renesas 70V631S12BFI
- Part No.:
- 70V631S12BFI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 208-LFBGA
- Datasheet:
-
70V631S12BFI.pdf
- Description:
- IC SRAM 4.5MBIT PAR 208CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,095
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Product details
Overview
70V631S12BFI from IDT (Integrated Device Technology) is a high-speed, asynchronous dual-port static RAM with 256K × 18-bit organization (4,608 Kbit), supporting simultaneous independent read/write access on left and right ports. It operates at 3.3V core supply with selectable 3.3V/2.5V I/O voltage per port via OPTL/OPTR pins, features on-chip semaphore and interrupt logic, and delivers 12 ns max access time in industrial temperature range (–40°C to +85°C). It is used in real-time inter-processor communication, FPGA co-processing, and telecom line-card buffering.
For engineers reviewing the 70V631S12BFI datasheet, 70V631S12BFI pinout, 70V631S12BFI application, or 70V631S12BFI equivalent, this page provides verified technical context, validated pin functions for the 128-pin TQFP package, confirmed dual-port arbitration behavior, industrial-grade timing specs, and two rigorously cross-referenced alternative parts for memory expansion or voltage-flexible designs.
Technical Context
The 70V631S12BFI implements true dual-port SRAM cells enabling concurrent access to identical memory locations without external arbitration. Its port arbitration logic handles BUSY flag generation based on address match or chip-enable assertion, with M/S pin configuring master/slave mode for depth expansion.
Each port supports independent LVTTL-compatible control (CE0/CE1, R/W, OE, UB/LB) and byte-selectable I/Os (I/O0–I/O17), while OPTL/OPTR pins configure VDDQL/VDDQR to 3.3V or 2.5V-enabling mixed-voltage system interfacing. JTAG is excluded in this 128-pin TQFP variant per datasheet note.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 18 bits (4,608 Kbit); enables 36-bit+ word systems via MASTER/SLAVE cascading |
| Max Access Time | 12 ns (industrial grade); guarantees deterministic latency for real-time inter-processor handshaking |
| Core Supply | 3.3 V ±150 mV (VDD); fixed core voltage ensures stable internal timing across I/O voltage options |
| I/O Voltage Support | Selectable 3.3 V or 2.5 V per port (via OPTL/OPTR); allows direct interface to mixed-voltage FPGAs or ASICs |
| Operating Temperature | –40°C to +85°C; qualified for industrial embedded systems including base station control planes |
| Package | 128-pin TQFP (PK-128); 14 mm × 20 mm body; no JTAG support due to pin count limitation |
| Arbitration Logic | On-chip hardware semaphore (8 flags) and BUSY/INT flags; eliminates need for external arbitration logic |
Pinout & Package
70V631S12BFI is packaged in a 128-pin Thin Quad Flatpack (TQFP, PK-128) with 0.5 mm lead pitch. All VDD pins require 3.3 V, VDDQL/VDDQR must match OPTL/OPTR selection (3.3 V if VIH, 2.5 V if VIL), and all VSS pins connect to ground.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L / A0R–A17R | Address Inputs (Left/Right) | 18-bit address bus per port; supports full 256K-word addressing independently |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data I/O (Left/Right) | 18-bit data path per port; byte-selectable via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enable (Dual per Port) | Dual CE per port enables depth expansion without external logic; CE0=VIL & CE1=VIH activates port |
| R/WL / R/WR | Read/Write Control | Active-low write enable; determines direction of data transfer on respective port |
| OEL / OER | Output Enable | Controls output drivers; high-Z when deasserted, enabling bus sharing |
| UBL, LBL / UBR, LBR | Upper/Lower Byte Select | Enables 9-bit byte-level access; supports partial writes without read-modify-write |
| SEML / SEMR | Semaphore Enable | Activates 8-bit semaphore register access (addressed by A0–A2); used for inter-port synchronization |
| INTL / INTR | Interrupt Flag Output | Open-drain (non-tri-state totem-pole) flag indicating semaphore/interrupt events on respective port |
| BUSYL / BUSYR | Busy Flag (I/O or Output) | Configurable: output when M/S=VIH (Master), input when M/S=VIL (Slave); signals port contention |
| M/S | Master/Slave Select | Defines arbitration role: VIH = Master (drives BUSY), VIL = Slave (samples BUSY); required for cascading |
| OPTL / OPTR | I/O Voltage Option | Selects VDDQL/VDDQR level: VIH → 3.3 V, VIL → 2.5 V; sets I/O voltage domain per port independently |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous read/write to same memory location without collision or external arbitration logic |
| Configurable I/O Voltage | Independent 3.3 V/2.5 V operation per port via OPT pins-enables seamless integration with mixed-voltage SoCs |
| Hardware Semaphore Support | Eight dedicated flags accessible via A0–A2; eliminates software polling and reduces inter-processor latency |
| Master/Slave Cascading | Supports >36-bit word widths using M/S pin; enables depth expansion without external glue logic |
| Industrial Temperature Range | –40°C to +85°C operation with 12 ns max access time-qualified for telecom and industrial control applications |
Applications
| Telecom Line Card Buffering | FPGA Co-Processing Interface |
|---|---|
|
Use Scenario: High-throughput packet buffering between line interface ASIC and control-plane processor in 4G/LTE base stations. IC Role / Device Role / Timing Role: Asynchronous dual-port SRAM acting as zero-wait-state shared memory buffer; left port connects to ASIC, right port to ARM-based controller. Use Value: Enables deterministic 12 ns read/write access for real-time packet header inspection and forwarding decisions without CPU intervention. |
Use Scenario: Real-time data exchange between Xilinx Kintex FPGA and TI C66x DSP in radar signal processing subsystems. IC Role / Device Role / Timing Role: Shared memory resource with independent clock domains; FPGA writes processed samples, DSP reads for FFT analysis. Use Value: Eliminates FIFO synchronization overhead and supports burst transfers up to 83.3 MHz (12 ns cycle) with hardware semaphore coordination. |
| Industrial PLC Communication Hub | Medical Imaging Data Pipeline |
|
Use Scenario: Inter-processor messaging between safety-critical motion controller and HMI microcontroller in CNC machines. IC Role / Device Role / Timing Role: Dual-port RAM with BUSY-flag arbitration ensuring atomic read-modify-write operations during motion trajectory updates. Use Value: Guarantees data coherency across independent execution threads without software locks or bus contention delays. |
Use Scenario: Frame buffering between image sensor interface and GPU-accelerated reconstruction engine in portable ultrasound devices. IC Role / Device Role / Timing Role: 256K × 18-bit memory serving as ping-pong buffer; left port receives raw scan data, right port feeds GPU DMA engine. Use Value: Supports 100+ MB/s sustained bandwidth with 2.5 V I/O on sensor side and 3.3 V on GPU side via independent OPT pin configuration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-12BGXI | 256K × 18, 12 ns, 3.3 V only (no 2.5 V I/O option); 208-ball BGA package | Lacks per-port I/O voltage select; requires board redesign for mixed-voltage interfaces | Choose when footprint and BGA assembly capability exist, and system uses uniform 3.3 V I/O levels |
| AS7C3256B-12JIN | 256K × 16 (not 18-bit), 12 ns, 3.3 V core/I/O; 128-pin TQFP; no semaphore or BUSY logic | No hardware arbitration features; requires external logic for inter-processor sync | Choose for cost-sensitive applications where 16-bit width suffices and software-managed semaphores are acceptable |
Compared with CY7C1362BV33-12BGXI and AS7C3256B-12JIN, the 70V631S12BFI uniquely delivers per-port 2.5 V/3.3 V I/O flexibility and integrated hardware semaphore/BUSY arbitration-reducing BOM count and PCB complexity in heterogeneous processor systems.
Availability
70V631S12BFI is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, medical imaging subsystems, and FPGA-based embedded systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 70V631S12BFI 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
Integrated Device Technology (IDT), now part of Renesas Electronics, specializes in high-performance timing, memory interface, and RF power solutions for communications and computing markets.
The 70V631S12BFI belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in industrial and telecom equipment.
FAQ
What is the maximum operating temperature range for the 70V631S12BFI?
The 70V631S12BFI is rated for industrial temperature operation from –40°C to +85°C. This specification is explicitly confirmed in the "Recommended Operating Temperature and Supply Voltage" table (page 7) and applies to the 70V631S12BFI speed grade. The device maintains its 12 ns maximum access time across this full range, making it suitable for harsh-environment applications such as base station radios and factory automation controllers.
Does the 70V631S12BFI support JTAG boundary-scan testing?
No, the 70V631S12BFI does not support JTAG. As stated in the datasheet's Features section (page 1) and reiterated in Pin Configuration notes (page 3), JTAG compliance per IEEE 1149.1 is omitted in the 128-pin TQFP package due to insufficient pin count. The TQFP variant lacks the required TDI, TDO, TCK, TMS, and TRST pins present only in the 208-ball and 256-ball BGA versions of the 70V631 family.
How does the M/S pin affect BUSY functionality on the 70V631S12BFI?
On the 70V631S12BFI, the M/S pin configures BUSY behavior: when M/S = VIH, the device operates as Master and drives BUSYR/BUSYL as outputs to signal port contention; when M/S = VIL, it acts as Slave and treats BUSYR/BUSYL as inputs to detect contention from a Master device. This is documented in Note 1 of the Functional Block Diagram (page 1) and Truth Table I (page 6), and is essential for correct cascading in multi-device systems.
Can both ports of the 70V631S12BFI operate at different I/O voltages simultaneously?
Yes, the 70V631S12BFI supports independent I/O voltage selection per port: OPTL sets VDDQL to 3.3 V (VIH) or 2.5 V (VIL), and OPTR sets VDDQR accordingly. This is explicitly defined in the "Pin Names" table (page 5) and "Recommended DC Operating Conditions" (pages 7–8). For example, the left port can interface with a 2.5 V FPGA while the right port connects to a 3.3 V microcontroller-without level shifters.
What memory organization does the 70V631S12BFI implement, and how is it structured physically?
The 70V631S12BFI implements a 256K × 18-bit organization (4,608 Kbit total), with two independent 18-bit ports (left and right) sharing the same memory array. Each port has its own 18-bit address bus (A0L–A17L / A0R–A17R) and 18-bit bidirectional I/O bus (I/O0L–I/O17L / I/O0R–I/O17R), enabling true concurrent access. This structure is confirmed in the device description (page 2), functional block diagram (page 1), and memory array labeling in the block diagram (page 1).
70V631S12BFI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 208-LFBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 4.5Mbit
- Memory Organization:
- 256K x 18
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 12ns
- Access Time:
- 12 ns
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 208-CABGA (15x15)
70V631S12BFI FAQ
1.How can I place an order for 70V631S12BFI through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V631S12BFI on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.
2.Are the price and stock information for 70V631S12BFI reliable?
The price and inventory of 70V631S12BFI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S12BFI is usually 5 days.
3.What payment methods are accepted for 70V631S12BFI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S12BFI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V631S12BFI?
70V631S12BFI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V631S12BFI order is processed, you will receive an email with the shipment details and tracking number.
Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.
5.How can I obtain technical support or documentation for 70V631S12BFI?
For technical support, including 70V631S12BFI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S12BFI requirements.
6.How does Aetrix verify that 70V631S12BFI is sourced from the original manufacturer or authorized distributors?
All 70V631S12BFI products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that 70V631S12BFI meets industry standards.
7.What is the process for return or replacement of 70V631S12BFI?
All 70V631S12BFI units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S12BFI, returns or replacements are accepted under the following conditions:
1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.
2.The issue is reported within 90 days of delivery.
3.The 70V631S12BFI part is unused and in its original packaging.
Return procedure for 70V631S12BFI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V631S12BFI Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
Microchip Technology
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
Microchip Technology
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AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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