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Renesas 70V631S12BCI8
- Part No.:
- 70V631S12BCI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70V631S12BCI8.pdf
- Description:
- IC SRAM 4.5MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,267
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Product details
Overview
70V631S12BCI8 from Integrated Device Technology (IDT) is a high-speed, asynchronous dual-port static RAM with 256K × 18-bit organization (4,608 Kbit), supporting simultaneous independent access on left and right ports. It operates at 3.3 V core supply and offers selectable 3.3 V or 2.5 V I/O voltage per port via OPTL/OPTR pins, with 12 ns maximum access time across industrial temperature range (–40°C to +85°C). It is used in real-time inter-processor communication, FPGA co-processing buffers, and telecom line card memory arbitration.
For engineers reviewing the 70V631S12BCI8 datasheet, 70V631S12BCI8 pinout, 70V631S12BCI8 application, or 70V631S12BCI8 equivalent, key selection considerations include dual-port arbitration logic, BUSY/INT flag timing, semaphore support for resource locking, and compatibility with 128-pin TQFP layout constraints where JTAG is omitted.
Technical Context
This device implements true dual-port SRAM architecture with fully independent address, data, and control paths per port - enabling concurrent read/write operations to the same memory location without external arbitration. On-chip hardware supports semaphore signaling (8 flags, addressed via A0–A2), automatic port arbitration, and MASTER/SLAVE cascading for 36-bit+ word expansion using M/S pin configuration.
It features separate byte enables (UBL/LBL, UBR/LBR), dual chip enables per port (CE0/CE1), and configurable I/O voltage domains - allowing mixed-voltage system interfacing. Power management includes four standby current modes (ISB1–ISB4), with full CMOS-level standby drawing as low as 3 mA (typ) at 25°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 18 bits (4,608 Kbit); supports 36-bit+ expansion via MASTER/SLAVE cascading |
| Access Time (max) | 12 ns - guarantees deterministic latency for real-time inter-processor handshaking |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded systems without derating |
| I/O Voltage Support | Selectable 3.3 V or 2.5 V per port via OPTL/OPTR - enables direct interface to mixed-voltage FPGAs or ASICs |
| Core Supply | 3.3 V ±150 mV - fixed VDD domain; decoupling must meet LVTTL noise margin requirements |
| Package | 128-pin TQFP (PK-128); 14 mm × 20 mm body; JTAG not supported due to pin count limitation |
| Arbitration Logic | Hardware-based BUSY flag generation with tBDD ≤12 ns - eliminates need for external semaphores in lock-step systems |
Pinout & Package
70V631S12BCI8 is housed in a 128-pin Thin Quad Flatpack (TQFP) package (PK-128), measuring approximately 14 mm × 20 mm × 1.4 mm. All VDD pins require 3.3 V supply; VDDQ pins must match OPT pin state (3.3 V if OPT = VIH, 2.5 V if OPT = VIL); all VSS pins connect to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L / A0R–A17R | Address Inputs (Left/Right Port) | 18-bit address bus per port; supports full 256K depth addressing independently |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data I/O (Left/Right Port) | 18-bit parallel data path; byte-selectable via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enable Inputs (Dual per Port) | Enables depth expansion without external logic; CE0X = VIL & CE1X = VIH selects port |
| R/WL / R/WR | Read/Write Control (Left/Right Port) | Active-low write enable; determines direction of data transfer on respective port |
| OEL / OER | Output Enable (Left/Right Port) | Controls tri-state output drivers; required to assert outputs during read cycles |
| BUSYL / BUSYR | Busy Flag (Input/Output depending on M/S) | When M/S = VIH (Master), BUSYX is output indicating port contention; when M/S = VIL (Slave), BUSYX is input for flow control |
| SEML / SEMR | Semaphore Enable (Left/Right Port) | Activates 8-bit semaphore register access (A0–A2 address space) for inter-port synchronization |
| M/S | Master/Slave Select | Configures device role in cascaded systems; determines BUSY pin direction and arbitration behavior |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write to identical memory locations - eliminates software arbitration overhead in multi-CPU systems |
| Hardware Semaphore Support | 8 dedicated flags accessible via A0–A2; enables atomic resource locking without CPU intervention or external logic |
| Configurable I/O Voltage | Per-port 3.3 V/2.5 V selection via OPTL/OPTR - allows seamless integration with legacy 3.3 V and modern 2.5 V logic families |
| Four Standby Current Modes | ISB3 as low as 3 mA (typ) with CMOS-level inputs - reduces power in idle states without sacrificing wake-up latency |
| MASTER/SLAVE Cascading | Supports 36-bit+ word width expansion using M/S pin and BUSY chaining - avoids discrete glue logic in wide-data applications |
Applications
| Telecom Line Card Buffering | FPGA Co-Processing Memory |
|---|---|
|
Use Scenario: High-throughput packet buffering between line interface ASIC and control processor in carrier-grade routers. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared memory; left port interfaces ASIC, right port interfaces ARM processor. Use Value: 12 ns access time ensures sub-microsecond inter-processor handshaking; BUSY arbitration prevents data corruption during concurrent access. |
Use Scenario: Real-time data exchange between FPGA fabric and external microcontroller in motor control systems. IC Role / Device Role / Timing Role: Serves as deterministic latency buffer for ADC sample streaming and PWM command updates. Use Value: Hardware semaphore support enables atomic flag updates for interrupt-driven event coordination without CPU polling. |
| Industrial PLC Inter-Processor Link | Avionics Sensor Fusion Hub |
|
Use Scenario: Shared memory between safety-critical motion controller and diagnostics subsystem in modular PLC chassis. IC Role / Device Role / Timing Role: Provides fault-isolated memory partitioning with BUSY-controlled write blocking during critical reads. Use Value: Industrial temperature rating (–40°C to +85°C) and 12 ns timing guarantee ensure deterministic operation in harsh environments. |
Use Scenario: Time-aligned sensor data aggregation from multiple inertial measurement units (IMUs) in flight control computers. IC Role / Device Role / Timing Role: Acts as synchronized staging buffer where left port ingests timestamped IMU packets, right port feeds Kalman filter engine. Use Value: Per-port I/O voltage select (OPTL/OPTR) allows direct connection to both 2.5 V IMU interfaces and 3.3 V DSP cores. |
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 core/I/O; no per-port voltage select; integrated JTAG boundary scan | Requires uniform 3.3 V I/O; lacks OPT-driven 2.5 V compatibility; preferred where testability > mixed-voltage flexibility | Choose when JTAG debug visibility is mandatory and system uses only 3.3 V logic. |
| AS7C3256B-12JIN | 256K × 18, 12 ns, 3.3 V core/I/O; no semaphore or BUSY arbitration logic; no MASTER/SLAVE mode | Needs external arbitration logic for multi-processor use; simpler interface but higher BOM cost and PCB area for complex systems | Choose for cost-sensitive, single-controller applications where hardware arbitration is unnecessary. |
Compared with CY7C1362BV33-12BGXI and AS7C3256B-12JIN, the 70V631S12BCI8 uniquely delivers per-port I/O voltage configurability, on-chip semaphore registers, and hardware BUSY arbitration - reducing system-level complexity in mixed-voltage, multi-processor designs.
Availability
70V631S12BCI8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for 70V631S12BCI8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management solutions for communications, computing, and industrial markets.
The 70V631S12BCI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where hardware arbitration and mixed-voltage interoperability are critical.
FAQ
What is the operating temperature range for the 70V631S12BCI8?
The 70V631S12BCI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (12 ns max), standby current (ISB2 ≤ 325 mA), and I/O voltage thresholds. It does not support extended commercial (0°C to +70°C) or automotive grades.
Does the 70V631S12BCI8 support JTAG boundary scan?
No, the 70V631S12BCI8 does not support JTAG boundary scan. The datasheet explicitly states that "due to limited pin count, JTAG is not supported on the 128-pin TQFP package." While JTAG signals (TCK, TMS, TDI, TDO, TRST) appear in the 208-ball and 256-ball BGA variants, they are omitted in the PK-128 footprint used by 70V631S12BCI8.
How does the M/S pin affect BUSY pin functionality in the 70V631S12BCI8?
In the 70V631S12BCI8, the M/S pin configures BUSY behavior: when M/S = VIH, BUSYL/BUSYR are outputs asserting during port contention; when M/S = VIL, BUSYL/BUSYR become inputs accepting external BUSY signals for slave-mode flow control. This enables flexible master/slave cascading without external logic.
Can both ports of the 70V631S12BCI8 operate at different I/O voltages simultaneously?
Yes - the 70V631S12BCI8 supports independent I/O voltage selection per port. OPTL sets left-port I/O voltage (3.3 V if VIH, 2.5 V if VIL); OPTR sets right-port I/O voltage. VDDQL and VDDQR must be supplied accordingly. This allows one port to interface with 3.3 V FPGAs while the other connects to 2.5 V ASICs.
What is the purpose of the semaphore feature in the 70V631S12BCI8?
The 70V631S12BCI8 includes eight hardware semaphore flags accessible via A0–A2 address lines. These flags provide atomic, lock-free resource synchronization between ports - e.g., signaling buffer readiness or mutex acquisition - without CPU involvement or external logic, reducing latency and software complexity in multi-processor systems.
70V631S12BCI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 256-LBGA
- Packaging:
- Tape & Reel (TR)
- 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:
- 256-CABGA (17x17)
70V631S12BCI8 FAQ
1.How can I place an order for 70V631S12BCI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V631S12BCI8 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 70V631S12BCI8 reliable?
The price and inventory of 70V631S12BCI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S12BCI8 is usually 5 days.
3.What payment methods are accepted for 70V631S12BCI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S12BCI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V631S12BCI8?
70V631S12BCI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V631S12BCI8 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 70V631S12BCI8?
For technical support, including 70V631S12BCI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S12BCI8 requirements.
6.How does Aetrix verify that 70V631S12BCI8 is sourced from the original manufacturer or authorized distributors?
All 70V631S12BCI8 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 70V631S12BCI8 meets industry standards.
7.What is the process for return or replacement of 70V631S12BCI8?
All 70V631S12BCI8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S12BCI8, 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 70V631S12BCI8 part is unused and in its original packaging.
Return procedure for 70V631S12BCI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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