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Renesas 70V631S15BC8
- Part No.:
- 70V631S15BC8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70V631S15BC8.pdf
- Description:
- IC SRAM 4.5MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:3,630
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Product details
Overview
70V631S15BC8 from IDT (Integrated Device Technology) is a high-speed, asynchronous dual-port static RAM with 256K × 18-bit organization (4,608 Kbit), operating at 3.3 V core supply and supporting selectable 3.3 V or 2.5 V I/O voltage per port via independent OPT pins. It delivers 15 ns max read/write cycle time, on-chip port arbitration, semaphore signaling, and BUSY/INT flags - enabling real-time inter-processor communication in telecom line cards and industrial motion controllers.
For engineers reviewing the 70V631S15BC8 datasheet, 70V631S15BC8 pinout, 70V631S15BC8 application, or 70V631S15BC8 equivalent, this page provides verified technical context, package-specific pin mapping for the 128-pin TQFP, key timing and power parameters, and two validated alternative parts for memory expansion or voltage-flexible dual-port designs.
Technical Context
The 70V631S15BC8 implements fully asynchronous dual-port architecture with independent address, control, and data buses on left (L) and right (R) ports - permitting simultaneous, conflict-free access to the same memory location. Its on-chip arbitration logic resolves contention using BUSY flag assertion (Master mode) or BUSY input sampling (Slave mode), with programmable priority via M/S pin.
Each port supports independent I/O voltage selection (3.3 V or 2.5 V) via dedicated OPTL/OPTR pins and corresponding VDDQL/VDDQR supplies. Semaphore and interrupt functions are hardware-implemented: eight semaphore flags are accessed via A0–A2 and I/O0, while INTL/INTR flags are set/cleared by writing to fixed addresses (0x3FFFE and 0x3FFFF) on the opposite port.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 18 bits (4,608 Kbit total); enables 36-bit+ word systems via Master/Slave cascading |
| Max Access Time | 15 ns (commercial grade); guarantees deterministic latency for real-time control loops |
| Core Supply | 3.3 V ±150 mV (VDD); fixed core voltage ensures stable internal timing across I/O voltage configurations |
| I/O Voltage Support | Selectable 3.3 V or 2.5 V per port (via OPTL/OPTR); allows interfacing with mixed-voltage ASICs or FPGAs |
| Operating Temperature | 0°C to +70°C (commercial); validated for use in telecom infrastructure and industrial PLC backplanes |
| Power Consumption | ISB3 = 3–15 mA (full standby, CMOS inputs); ultra-low quiescent current during idle periods |
| Arbitration Logic | Hardware-based BUSY flag with tBDD ≤15 ns; eliminates need for external semaphores or software polling |
Pinout & Package
70V631S15BC8 is packaged in a 128-pin Thin Quad Flatpack (TQFP), body size 14 mm × 20 mm × 1.4 mm, with 0.5 mm lead pitch. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR logic level (3.3 V if VIH, 2.5 V if VIL); all VSS pins connect to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L / A0R–A17R | Address Inputs (Left/Right) | 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) | 18-bit parallel data path per port; byte-selectable via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enable Pairs | 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; controls direction of data flow on respective port's I/O bus |
| OEL / OER | Output Enable | Tri-states I/O outputs when high; required for bus sharing in multi-device systems |
| BUSYL / BUSYR | Busy Flag (Input/Output) | Output when M/S=VIH (Master); input when M/S=VIL (Slave); signals port contention |
| SEML / SEMR | Semaphore Enable | Enables hardware semaphore access (A0–A2 + I/O0) for inter-processor synchronization |
| INTL / INTR | Interrupt Flag | Open-drain output; set/cleared by opposite port writing to 0x3FFFE/0x3FFFF addresses |
| M/S | Master/Slave Select | VIH configures as Master (BUSY output); VIL configures as Slave (BUSY input) |
| OPTL / OPTR | I/O Voltage Option | VIH selects 3.3 V I/O levels; VIL selects 2.5 V I/O levels; sets VDDQL/VDDQR requirement |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Memory Cells | Enables concurrent read/write to identical addresses - critical for lock-free buffer sharing between CPUs or DSPs |
| Independent Per-Port I/O Voltage | OPTL/OPTR pins allow left port at 3.3 V and right port at 2.5 V - simplifies interface to heterogeneous logic families |
| Hardware Semaphore Signaling | Eight dedicated flags accessible via A0–A2 and I/O0 - reduces software overhead in multi-core RTOS environments |
| On-Chip Port Arbitration | BUSY flag generation/resolution with tBDD ≤15 ns - eliminates external arbitration logic and PCB routing complexity |
| Depth Expansion Support | Dual chip enables (CE0/CE1) and M/S pin enable seamless 36-bit+ memory expansion without glue logic |
Applications
| Telecom Line Card Buffering | Industrial Motion Controller Shared Memory |
|---|---|
Use Scenario: Bidirectional packet buffering between line interface unit (LIU) and host processor in TDM-over-IP gateways. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency FIFO buffer; left port interfaces LIU (2.5 V), right port connects FPGA host (3.3 V). Use Value: Asynchronous operation and 15 ns access ensure deterministic jitter-free packet forwarding at OC-48 rates. |
Use Scenario: Real-time coordinate exchange between servo axis controller and main motion CPU in CNC machines. IC Role / Device Role / Timing Role: Shared memory resource with hardware semaphore; left port used by motion CPU, right port by axis IC. Use Value: On-chip BUSY arbitration prevents race conditions during simultaneous position/velocity updates at 10 kHz loop rates. |
| Medical Imaging Data Pipeline | Avionics Display System Frame Buffer |
Use Scenario: High-throughput transfer of reconstructed CT scan slices from DSP array to display subsystem. IC Role / Device Role / Timing Role: Dual-port SRAM serves as ping-pong frame buffer; one port writes new slice, other reads for rendering. Use Value: 15 ns access time and full on-chip arbitration eliminate pipeline stalls during 60 fps real-time visualization. |
Use Scenario: Graphics overlay buffering between flight management computer (FMC) and graphics processor in EFIS displays. IC Role / Device Role / Timing Role: Left port receives navigation data (3.3 V), right port feeds GPU (2.5 V); INTL/INTR signal data readiness. Use Value: Independent I/O voltage support enables direct connection to mixed-voltage avionics SoCs without level shifters. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV18-167BZC | 167 MHz synchronous interface; requires clock and control sequencing; no per-port I/O voltage selection | Best suited for clocked FPGA-based systems where deterministic burst transfers outweigh flexibility needs | Choose when system already uses synchronous memory controllers and 2.5 V/3.3 V mixing is not required |
| AS7C3256A-15JCIN | Single-port, 32K × 8 organization; no BUSY/semaphore logic; 15 ns access but no arbitration hardware | Applicable only in non-contention scenarios with external arbitration or software-managed access | Choose only for cost-sensitive, low-complexity designs lacking real-time inter-processor coordination requirements |
Compared with CY7C1362BV18-167BZC and AS7C3256A-15JCIN, the 70V631S15BC8 uniquely combines asynchronous operation, per-port voltage flexibility, and integrated hardware arbitration - making it irreplaceable in mixed-voltage, real-time embedded systems requiring guaranteed contention resolution without software overhead.
Availability
70V631S15BC8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motion control, and medical imaging systems requiring stable component supply, long-term obsolescence management, and traceable sourcing.
Supply support for 70V631S15BC8 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 sensor solutions for communications and industrial markets.
The 70V631S series was designed specifically for high-reliability, low-latency inter-processor communication in telecom line cards, industrial automation, and test equipment - emphasizing asynchronous operation, hardware arbitration, and flexible I/O voltage support.
FAQ
What is the maximum operating temperature range for the 70V631S15BC8?
The 70V631S15BC8 is rated for commercial temperature operation from 0°C to +70°C. It is not specified for industrial range (–40°C to +85°C); that grade is available under different suffixes (e.g., 70V631S12BC8I). The 'C' in BC8 denotes commercial grade, and the '15' specifies 15 ns access time.
Does the 70V631S15BC8 support JTAG boundary-scan testing?
No, the 70V631S15BC8 does not support JTAG. Although the device includes TDI, TDO, TCK, TMS, and TRST pins, the datasheet explicitly states: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package." These pins are no-connect (NC) in the 70V631S15BC8 variant.
How does the BUSY arbitration work when both ports attempt simultaneous access to the same address?
When both ports access the same address, the 70V631S15BC8 asserts BUSY on the later-arriving port within ≤15 ns (tBDD). If configured as Master (M/S = VIH), BUSY is driven high to block the second port's write; if Slave (M/S = VIL), BUSY is sampled as input to stall the local write. Priority is determined by arrival time, not port identity.
Can the left and right ports of the 70V631S15BC8 operate at different I/O voltages simultaneously?
Yes. The 70V631S15BC8 supports independent I/O voltage selection: OPTL sets left-port I/O voltage (3.3 V if VIH, 2.5 V if VIL), and OPTR sets right-port I/O voltage. Corresponding VDDQL and VDDQR supplies must be set accordingly - enabling direct interfacing with mixed-voltage FPGAs or ASICs.
What is the function of the M/S pin on the 70V631S15BC8?
The M/S pin configures the 70V631S15BC8 as either Master (M/S = VIH) or Slave (M/S = VIL). In Master mode, BUSYL/BUSYR are outputs signaling contention; in Slave mode, they become inputs for receiving BUSY from a Master device. This enables hierarchical multi-chip memory expansion with automatic arbitration.
70V631S15BC8 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:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-CABGA (17x17)
70V631S15BC8 FAQ
1.How can I place an order for 70V631S15BC8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V631S15BC8 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 70V631S15BC8 reliable?
The price and inventory of 70V631S15BC8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S15BC8 is usually 5 days.
3.What payment methods are accepted for 70V631S15BC8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S15BC8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V631S15BC8?
70V631S15BC8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V631S15BC8 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 70V631S15BC8?
For technical support, including 70V631S15BC8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S15BC8 requirements.
6.How does Aetrix verify that 70V631S15BC8 is sourced from the original manufacturer or authorized distributors?
All 70V631S15BC8 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 70V631S15BC8 meets industry standards.
7.What is the process for return or replacement of 70V631S15BC8?
All 70V631S15BC8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S15BC8, 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 70V631S15BC8 part is unused and in its original packaging.
Return procedure for 70V631S15BC8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V631S15BC8 Tags
-
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
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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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