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Renesas 70T651S15BF
- Part No.:
- 70T651S15BF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 208-LFBGA
- Datasheet:
-
70T651S15BF.pdf
- Description:
- IC SRAM 9MBIT PARALLEL 208CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:4,785
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Product details
Overview
70T651S15BF from Integrated Device Technology is a high-speed 256K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 15 ns maximum read cycle 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 network packet buffering systems.
For engineers reviewing the 70T651S15BF datasheet, 70T651S15BF pinout, 70T651S15BF application, or 70T651S15BF equivalent, this device supports simultaneous access to shared memory locations, hardware semaphore arbitration, JTAG IEEE 1149.1 compliance, and RapidWrite mode for back-to-back writes-critical for low-latency deterministic memory sharing in multi-CPU architectures.
Technical Context
The 70T651S15BF implements true dual-port SRAM cells enabling concurrent read/write operations on both ports without contention. Its on-chip arbitration logic manages port priority and resolves simultaneous access conflicts via BUSY flag signaling and M/S master/slave configuration.
Each port features independent CE0/CE1 enables, R/W control, byte-enable (BE0–BE3) for 9-bit granularity, and OPT-selectable I/O voltage (2.5 V or 3.3 V). The device supports sleep mode (ZZL/ZZR) and full JTAG boundary-scan testability at up to 10 MHz TCK frequency.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 36 bits (9,216 Kbit total); supports 72-bit+ expansion via Master/Slave cascading |
| Access Time (tAA) | 15 ns max - defines minimum address stability window before valid data appears |
| Read Cycle Time (tRC) | 15 ns max - sets shortest interval between successive reads on same port |
| Core Supply Voltage | 2.5 V ±100 mV - powers internal logic; requires all VDD pins tied to 2.5 V |
| I/O Interface Voltage | Selectable 2.5 V or 3.3 V per port via OPTL/OPTR - enables mixed-voltage system integration |
| Operating Temperature | 0°C to +70°C (Commercial grade) - validated for stable operation across full ambient range |
| Package | 208-ball fine-pitch BGA (BF208), 15 mm × 15 mm × 1.4 mm, 0.8 mm ball pitch |
Pinout & Package
70T651S15BF is housed in a 208-ball fpBGA (BF208) package with 0.8 mm ball pitch and 15 mm × 15 mm body size. Power and ground balls are distributed across the array for low-inductance decoupling; VDDQ pins are segregated per port to support independent I/O voltage selection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L, A0R–A17R | Address Inputs (Left/Right) | 18-bit address bus per port; A17 is NC for IDT70T659 variant only |
| I/O0L–I/O35L, I/O0R–I/O35R | Bidirectional Data Bus (36-bit) | Independent 36-bit I/O per port; supports byte-level writes via BE0–BE3 |
| CE0L/CE1L, CE0R/CE1R | Chip Enable Inputs | Dual CE per port enables depth expansion without external logic; CE0=VIL & CE1=VIH selects active state |
| R/WL, R/WR | Read/Write Control | Active-low write enable; controls direction of data flow on respective port |
| OEL, OER | Output Enable | Tri-states I/O drivers when high; required for read operations |
| BE0L–BE3L, BE0R–BE3R | Byte Enable Inputs | Four independent 9-bit byte enables per port; allows partial-word writes without masking logic |
| SEML, SEMR | Semaphore Enable | Activates on-chip 8-flag semaphore register for inter-port synchronization |
| BUSYL, BUSYR | Busy Flag | Push-pull output indicating port contention; acts as input when slave (M/S=VIL) |
| M/S | Master/Slave Select | Configures BUSY behavior: VIH = BUSY output (Master), VIL = BUSY input (Slave) |
| OPTL, OPTR | I/O Voltage Option | Set to VDD (2.5 V) for 3.3 V I/O operation; set to VSS (0 V) for 2.5 V I/O operation |
| ZZL, ZZR | Sleep Mode Input | Assert high to disable dynamic inputs (except JTAG); reduces ISB to ≤10 mA |
| TCK, TMS, TDI, TDO, TRST | JTAG Test Interface | Fully compliant with IEEE 1149.1; supports boundary-scan at ≤10 MHz clock rate |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent access to identical memory locations-eliminates arbitration delays in real-time co-processing |
| RapidWrite Mode | Allows consecutive writes without toggling R/W or CE; address transition defines cycle end-reduces timing overhead by >40% vs. standard async SRAM |
| Hardware Semaphore Logic | On-chip 8-flag semaphore register accessible via dedicated SEM control-removes need for external locking logic in multi-threaded firmware |
| Flexible I/O Voltage Selection | Independent OPTL/OPTR pins configure each port for 2.5 V or 3.3 V signaling-enables direct interfacing with mixed-voltage FPGAs or ASICs |
| Low-Power Sleep Mode | ZZL/ZZR assertion cuts dynamic current to ≤10 mA while preserving JTAG accessibility-ideal for power-gated subsystems |
Applications
| Telecom Switching Fabric | Network Packet Buffering |
|---|---|
|
Use Scenario: High-throughput line cards performing parallel header parsing and forwarding decisions across multiple CPUs. IC Role / Device Role / Timing Role: Shared memory buffer between ingress and egress processors with deterministic latency under worst-case contention. Use Value: 15 ns tAA and hardware semaphore ensure sub-30 ns inter-processor handoff-meeting strict 10 Gbps packet processing SLAs. |
Use Scenario: Deep packet inspection engines requiring temporary storage of fragmented IPv6 packets prior to reassembly. IC Role / Device Role / Timing Role: Dual-port SRAM acting as zero-wait-state scratchpad for two independent DMA channels accessing overlapping buffers. Use Value: Independent byte enables (BE0–BE3) allow per-fragment writes without overwriting adjacent payload-reducing software overhead by 65%. |
| Industrial PLC Co-Processor | Avionics Data Concentrator |
|
Use Scenario: Real-time motion control module where FPGA handles servo loop timing and ARM processor manages HMI and diagnostics. IC Role / Device Role / Timing Role: Synchronization point for time-critical motion parameters and non-critical status logs using semaphore flags. Use Value: On-chip semaphore logic eliminates race conditions during parameter updates-ensuring deterministic 1 ms control loop execution. |
Use Scenario: Flight management system consolidating sensor data from ARINC 429, MIL-STD-1553, and discrete I/O modules. IC Role / Device Role / Timing Role: Memory-mapped buffer enabling simultaneous read (by safety-critical CPU) and write (by I/O controller) of telemetry streams. Use Value: BUSY flag signaling prevents data corruption during concurrent access-certifiable per DO-254 Level A requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1362KV18 | 144-pin TQFP; 18-bit × 256K organization; 2.5 V core only; no OPT-selectable I/O | Limited to 18-bit data path; lacks per-port voltage flexibility and RapidWrite mode | Choose for cost-sensitive designs where 36-bit width and mixed-voltage I/O are unnecessary |
| Renesas R1EX24064AS | 100-pin TQFP; 64K × 16 organization; 3.3 V only; no JTAG or semaphore logic | Lower density and narrower bus; no hardware arbitration-requires external sync logic | Choose only for legacy 16-bit systems lacking real-time inter-processor coordination needs |
Compared with CY7C1362KV18 and R1EX24064AS, the 70T651S15BF delivers full 36-bit dual-port bandwidth, per-port I/O voltage configurability, integrated semaphore arbitration, and RapidWrite capability-making it uniquely suited for new designs demanding deterministic low-latency memory sharing.
Availability
70T651S15BF is available at Aetrix Electronics and suitable for telecom switching fabric, network packet buffering, and industrial PLC co-processor applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 70T651S15BF 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 high-performance interconnect solutions.
The 70T651S15BF belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered specifically for deterministic real-time memory sharing in multi-processor systems requiring zero-wait-state access and hardware-enforced synchronization.
FAQ
What is the maximum operating temperature range for the 70T651S15BF?
The 70T651S15BF 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 70T651S10BF and 70T651S12BF variants per the datasheet revision DSC-5632/10.
Does the 70T651S15BF support JTAG boundary-scan testing?
Yes, the 70T651S15BF fully supports IEEE 1149.1 JTAG boundary-scan with dedicated TCK, TMS, TDI, TDO, and TRST pins. The TAP controller operates at up to 10 MHz and remains functional even during ZZL/ZZR sleep mode assertion.
How does RapidWrite Mode function in the 70T651S15BF?
In RapidWrite Mode, the 70T651S15BF defines write cycle end by address transition-not R/W or CE deassertion. R/W, CE, and BE signals remain asserted across consecutive writes, reducing setup complexity and enabling back-to-back writes at full 15 ns cycle rate without narrow pulse generation.
Can both ports of the 70T651S15BF operate at different I/O voltages simultaneously?
Yes-the 70T651S15BF supports independent I/O voltage selection: OPTL configures the left port for either 2.5 V or 3.3 V operation, and OPTR does the same for the right port. This allows one port to interface with a 3.3 V FPGA while the other connects to a 2.5 V ASIC.
What is the purpose of the M/S pin on the 70T651S15BF?
The M/S pin configures BUSY flag behavior: when driven high (VIH), the 70T651S15BF acts as Master and drives BUSYL/BUSYR outputs; when low (VIL), it acts as Slave and accepts BUSY inputs-enabling hierarchical arbitration in multi-device memory systems.
70T651S15BF 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:
- 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:
- 208-CABGA (15x15)
70T651S15BF FAQ
1.How can I place an order for 70T651S15BF through Aetrix?
Please submit a Request for Quotation (RFQ) for 70T651S15BF 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 70T651S15BF reliable?
The price and inventory of 70T651S15BF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70T651S15BF is usually 5 days.
3.What payment methods are accepted for 70T651S15BF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70T651S15BF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70T651S15BF?
70T651S15BF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70T651S15BF 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 70T651S15BF?
For technical support, including 70T651S15BF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70T651S15BF requirements.
6.How does Aetrix verify that 70T651S15BF is sourced from the original manufacturer or authorized distributors?
All 70T651S15BF 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 70T651S15BF meets industry standards.
7.What is the process for return or replacement of 70T651S15BF?
All 70T651S15BF units undergo pre-shipment inspection (PSI). If there is an issue with 70T651S15BF, 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 70T651S15BF part is unused and in its original packaging.
Return procedure for 70T651S15BF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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