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Renesas 70T651S15BC8
- Part No.:
- 70T651S15BC8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70T651S15BC8.pdf
- Description:
- IC SRAM 9MBIT PARALLEL 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,517
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Product details
Overview
70T651S15BC8 from Integrated Device Technology is a high-speed 256K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 15 ns max access time, 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port-designed for real-time inter-processor communication in telecom switching fabric and military avionics data buffers.
For engineers reviewing the 70T651S15BC8 datasheet, 70T651S15BC8 pinout, 70T651S15BC8 application, or 70T651S15BC8 equivalent, key selection criteria include simultaneous dual-port read/write capability, RapidWrite mode timing compliance, M/S master/slave arbitration support, and BC-256 BGA package thermal-mechanical suitability for high-reliability embedded systems.
Technical Context
This device implements true dual-port SRAM cells enabling concurrent access to the same memory location from separate address/control/I/O buses. On-chip arbitration logic resolves port contention via BUSY flag signaling and semaphore registers accessible through dedicated A0–A2 addressing.
Each port supports independent power domains: fixed 2.5 V core (VDD) and configurable I/O voltage (VDDQ) selected per port via OPTL/OPTR pins-enabling mixed-voltage system integration without level shifters. JTAG IEEE 1149.1 boundary scan is fully supported with TRST, TCK, TMS, TDI, and TDO pins.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 36 bits (9,216 Kbit total); enables 72-bit+ word expansion via Master/Slave cascading |
| Access Time (tAA) | 15 ns max (commercial grade); guarantees deterministic latency for real-time control loops |
| Core Supply Voltage | 2.5 V ±100 mV; requires all VDD pins tied to regulated 2.5 V rail |
| I/O Interface Voltage | Selectable 2.5 V or 3.3 V per port via OPTL/OPTR; VDDQL/VDDQR must match selected level |
| Operating Temperature | 0°C to +70°C (commercial); validated for stable operation across full ambient range |
| Package | 256-ball BGA (BC256); 17 mm × 17 mm body, 1.0 mm ball pitch, RoHS-compliant |
| Power Consumption | ISB3 = 2–10 mA (full standby); IDD = 225–305 mA (dynamic, both ports active at fMAX) |
Pinout & Package
256-ball fine-pitch Ball Grid Array (BC256) package with 17 mm × 17 mm footprint, 1.4 mm height, and 1.0 mm ball pitch. Thermal pad exposed on underside for enhanced heat dissipation in high-density PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L | Left port address inputs | 18-bit address bus for left-side memory access; A17L is functional (unlike IDT70T659) |
| I/O0L–I/O35L | Left port bidirectional data | 36-bit parallel data path; byte-enable controlled via BE0L–BE3L (9-bit granularity) |
| CE0L, CE1L | Left port chip enables | Dual CE architecture allows depth expansion without external logic; CE0L=VIL & CE1L=VIH enables port |
| R/WL, OEL | Left port control | R/WL controls direction; OEL gates output drivers-both required low for read access |
| SEML, BUSYL, INTL | Left port status/signaling | SEML enables semaphore register access; BUSYL flags arbitration conflict; INTL asserts on semaphore event |
| OPTL, ZZL, M/S | Left port configuration | OPTL selects 2.5 V/3.3 V I/O; ZZL enters sleep mode (low dynamic current); M/S configures master/slave role |
| VDD, VDDQL, VSS | Power distribution | VDD = 2.5 V core; VDDQL = I/O supply (2.5 V or 3.3 V); VSS = ground reference for all domains |
| TCK–TDO | JTAG test interface | Fully compliant IEEE 1149.1 boundary scan; operates independently of sleep mode |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write to identical addresses-critical for lock-free inter-processor messaging |
| RapidWrite Mode | Eliminates R/W pulse requirement between consecutive writes; reduces cycle overhead by up to 40% at 15 ns timing |
| Per-Port Voltage Selection | OPTL/OPTR pins configure each port for 2.5 V or 3.3 V I/O-supports heterogeneous bus interfacing without external translators |
| Hardware Semaphore Logic | Eight dedicated flags accessible via A0–A2; enables atomic resource locking across ports without software intervention |
| Master/Slave Cascading | M/S pin configures BUSY flag as input (slave) or output (master); simplifies 72-bit+ memory expansion with no glue logic |
Applications
| Telecom Switching Fabric | Military Avionics Data Buffer |
|---|---|
Use Scenario: High-throughput packet header inspection and forwarding in carrier-grade routers. IC Role / Device Role / Timing Role: Dual-port SRAM serves as shared lookup table memory between ingress and egress processing engines. Use Value: 15 ns tAA ensures sub-30 ns round-trip latency for critical forwarding decisions; RapidWrite mode accelerates table updates during route convergence. | Use Scenario: Real-time sensor fusion buffer in flight control computers requiring deterministic read/write coherency. IC Role / Device Role / Timing Role: Acts as time-synchronized data exchange buffer between redundant flight management units. Use Value: Hardware semaphore logic guarantees atomic access to shared navigation state variables; industrial-grade timing stability maintained across –40°C to +85°C. |
| Industrial PLC Communication Module | Medical Imaging Frame Store |
Use Scenario: Protocol translation gateway between Modbus RTU and EtherCAT networks in factory automation. IC Role / Device Role / Timing Role: Stores protocol-mapped register maps and message queues accessible concurrently by two microcontrollers. Use Value: Independent left/right voltage domains (2.5 V MCU / 3.3 V PHY) eliminate level-shifter components; BC256 package supports compact 6-layer PCB layout. | Use Scenario: Temporary frame storage in digital X-ray acquisition systems prior to DICOM compression. IC Role / Device Role / Timing Role: Buffers raw 16-bit pixel data streams from dual ADC channels into unified memory space. Use Value: 36-bit width matches 16-bit pixel + 16-bit metadata + 4-bit sync tag; 256K depth supports 512×512 monochrome frames at full speed. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-15ZXI | 3.3 V core; 15 ns access; 128K × 32 organization; TQFP-128 package | Lacks RapidWrite mode and hardware semaphore; requires external arbitration logic | Choose when lower pin count and 3.3 V-only system integration outweigh dual-port coherency features |
| AS7C33256P-15TCN | Single-port; 32K × 32 organization; 15 ns; TSOP-II-86 package; 3.3 V only | No dual-port capability; no M/S or semaphore logic; significantly smaller density | Consider only for cost-sensitive, non-concurrent-access applications where inter-port synchronization is handled in firmware |
Compared with CY7C1362BV33-15ZXI and AS7C33256P-15TCN, the 70T651S15BC8 delivers unique value through simultaneous dual-port access, on-chip arbitration, and per-port voltage flexibility-making it irreplaceable in systems requiring hardware-enforced memory coherency without added logic.
Availability
70T651S15BC8 is available at Aetrix Electronics and suitable for telecom switching fabric, military avionics data buffers, and industrial PLC communication modules requiring stable component supply across extended product lifecycles.
Supply support for 70T651S15BC8 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 solutions for communications, computing, and industrial markets.
The IDT70T651/9 product line was engineered specifically for deterministic, low-latency inter-processor communication-delivering hardware-accelerated memory coherency in safety-critical and real-time embedded systems.
FAQ
What is the maximum operating temperature range for the 70T651S15BC8?
The 70T651S15BC8 is rated for commercial temperature operation from 0°C to +70°C. It is not qualified for industrial temperature range (–40°C to +85°C); that grade is available only in the 70T651S10 and 70T651S12 variants. The BC256 package's thermal characteristics have been validated across this full commercial range with no derating required.
Does the 70T651S15BC8 support RapidWrite mode, and how does it affect timing?
Yes, the 70T651S15BC8 fully supports RapidWrite mode, which allows back-to-back write operations without pulsing R/W, CE, or BE signals high between cycles. In this mode, the write cycle end is defined by the address transition-not signal deassertion-reducing setup complexity and improving effective throughput. All standard AC parameters (tWC, tDW, tDH) still apply, referenced to the ending address edge.
How is the I/O voltage configured on each port of the 70T651S15BC8?
The 70T651S15BC8 uses OPTL and OPTR pins to configure I/O voltage per port: tying OPTL to VDD (2.5 V) selects 3.3 V I/O levels and requires VDDQL = 3.3 V; tying OPTL to VSS (0 V) selects 2.5 V I/O levels and requires VDDQL = 2.5 V. The right port operates identically via OPTR/VDDQR. Both ports may be set to the same or different voltages simultaneously.
What is the function of the M/S pin on the 70T651S15BC8, and how does it impact BUSY behavior?
The M/S pin configures the 70T651S15BC8 as Master (M/S = VIH) or Slave (M/S = VIL). When configured as Master, BUSYL/BUSYR are output flags indicating port contention; as Slave, they become inputs accepting BUSY signals from a Master device. This enables hierarchical arbitration in multi-device memory systems without external logic.
Can the 70T651S15BC8 be used in JTAG boundary scan testing, and are there any operational restrictions?
Yes, the 70T651S15BC8 fully supports IEEE 1149.1 JTAG boundary scan using TCK, TMS, TDI, TDO, and TRST pins. JTAG remains functional during sleep mode (ZZL/ZZR = VIH), but the specification recommends avoiding boundary scan activation during sleep to prevent unintended interactions with internal clock gating. All scan operations use the core VDD domain and are independent of I/O voltage settings.
70T651S15BC8 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:
- 9Mbit
- Memory Organization:
- 256K x 36
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 15ns
- Access Time:
- 15 ns
- Voltage - Supply:
- 2.4V ~ 2.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-CABGA (17x17)
70T651S15BC8 FAQ
1.How can I place an order for 70T651S15BC8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70T651S15BC8 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 70T651S15BC8 reliable?
The price and inventory of 70T651S15BC8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70T651S15BC8 is usually 5 days.
3.What payment methods are accepted for 70T651S15BC8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70T651S15BC8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70T651S15BC8?
70T651S15BC8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70T651S15BC8 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 70T651S15BC8?
For technical support, including 70T651S15BC8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70T651S15BC8 requirements.
6.How does Aetrix verify that 70T651S15BC8 is sourced from the original manufacturer or authorized distributors?
All 70T651S15BC8 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 70T651S15BC8 meets industry standards.
7.What is the process for return or replacement of 70T651S15BC8?
All 70T651S15BC8 units undergo pre-shipment inspection (PSI). If there is an issue with 70T651S15BC8, 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 70T651S15BC8 part is unused and in its original packaging.
Return procedure for 70T651S15BC8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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