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Renesas 70V639S15BF8
- Part No.:
- 70V639S15BF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 208-LFBGA
- Datasheet:
-
70V639S15BF8.pdf
- Description:
- IC SRAM 2.25MBIT PAR 208CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,063
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Product details
Overview
70V639S15BF8 from Integrated Device Technology is a high-speed 128K × 18 asynchronous dual-port static RAM with true independent left/right port access, 15 ns maximum read cycle time, 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port-designed for real-time inter-processor communication in industrial control systems.
For engineers reviewing the 70V639S15BF8 datasheet, 70V639S15BF8 pinout, 70V639S15BF8 application, or 70V639S15BF8 equivalent, key selection criteria include simultaneous dual-port arbitration, on-chip semaphore logic, BUSY flag timing (tBDD ≤ 15 ns), Master/Slave cascading support, and 208-ball BGA package compatibility with industrial temperature range (–40°C to +85°C).
Technical Context
The 70V639S15BF8 implements fully asynchronous dual-port architecture with separate address, control, and bidirectional I/O buses for left and right ports-enabling concurrent read/write operations to the same memory location without external arbitration logic. Its on-chip arbitration logic resolves port contention via BUSY flag assertion and supports semaphore signaling across ports using dedicated SEM pins and A0–A2 address decoding.
Each port features independent chip enables (CE0/CE1), byte controls (UB/LB), read/write enable (R/W), output enable (OE), and selectable I/O voltage (via OPTL/OPTR), allowing mixed-voltage system integration. The device supports JTAG boundary-scan (IEEE 1149.1) in 208-ball and 256-ball packages-but not in the 128-pin TQFP variant.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 128K × 18 bits (2,304 Kbit total); supports 36-bit+ expansion via Master/Slave cascading |
| Access Time (max) | 15 ns read cycle (tRC); enables real-time data exchange between co-located processors |
| Supply Voltages | VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O per port) |
| Operating Temperature | –40°C to +85°C (industrial grade); qualified for embedded control and automation environments |
| Package | 208-ball fine-pitch BGA (BF208); 14 mm × 20 mm body, 0.8 mm ball pitch |
| Arbitration Logic | Hardware-supported port arbitration with BUSY flag (tBDD ≤ 15 ns) and semaphore registers (8 flags, A0–A2 addressed) |
| Power Consumption | ISB3 full standby current ≤ 15 mA (both ports CMOS-level disabled); dynamic IDD ≤ 440 mA at fMAX |
Pinout & Package
70V639S15BF8 is packaged in a 208-ball fine-pitch BGA (package code BF208), with 14 mm × 20 mm footprint and 0.8 mm ball pitch. Pin functions are defined per port (Left/Right), with dedicated power (VDD, VDDQL, VDDQR), ground (VSS), control (CE0L/CE1L, CE0R/CE1R, R/WL/R/WR, OEL/OER), address (A0L–A16L, A0R–A16R), data (I/O0L–I/O17L, I/O0R–I/O17R), and special-purpose signals (SEML/SEMR, INTL/INTR, BUSYL/BUSYR, M/S, OPTL/OPTR, UBL/UBR, LBL/LBR).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD | Core power supply | Must be connected to 3.3 V ±150 mV; all VDD balls tied to same plane |
| VDDQL / VDDQR | I/O power per port | Voltage set by OPTL/OPTR: 3.3 V if VIH, 2.5 V if VIL; decoupling required per port |
| CE0L / CE1L CE0R / CE1R | Chip enable pair per port | Active-low enable logic: CE0X = VIL & CE1X = VIH selects port; enables depth expansion without glue logic |
| R/WL / R/WR | Read/write direction control | Low = write, High = read; controls data flow direction on respective I/O bus |
| OEL / OER | Output enable per port | Low = enable outputs; high-Z when deasserted-critical for bus sharing and hot-swap isolation |
| SEML / SEMR | Semaphore enable | Enables semaphore register access (A0–A2 address space); used for inter-port synchronization |
| BUSYL / BUSYR | Port arbitration status | Output when M/S = VIH (Master); input when M/S = VIL (Slave); asserts during address/contention conflict |
| M/S | Master/Slave select | VIH = BUSY output (Master mode); VIL = BUSY input (Slave mode); enables multi-device cascading |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous, independent read/write access to identical addresses-eliminates software arbitration overhead |
| On-chip semaphore logic | Eight hardware semaphore flags accessible via A0–A2; supports atomic lock/unlock across ports without CPU intervention |
| Independent I/O voltage selection | OPTL/OPTR pins allow left/right ports to operate at 3.3 V or 2.5 V independently-simplifies mixed-voltage system design |
| Automatic power-down control | CE0/CE1-driven standby modes (ISB1–ISB4) reduce active current to ≤15 mA in full standby-critical for low-power embedded operation |
| Master/Slave cascading capability | M/S pin configures device as Master (BUSY output) or Slave (BUSY input), enabling seamless 36-bit+ word-width expansion |
Applications
| Industrial PLC Data Exchange | Real-Time Motion Controller Buffer |
|---|---|
Use Scenario: Two independent PLC CPUs share configuration and status data via shared memory without bus contention. IC Role / Device Role / Timing Role: Dual-port SRAM acts as coherent inter-processor mailbox with hardware arbitration and BUSY flag coordination. Use Value: Eliminates need for external arbitration logic; 15 ns access ensures deterministic response in <100 µs control cycles. | Use Scenario: Motion controller FPGA reads trajectory data while servo processor writes updated position feedback. IC Role / Device Role / Timing Role: Asynchronous dual-port buffer synchronizes high-speed motion loop data streams with no clock domain crossing. Use Value: True dual-port architecture prevents read/write collisions; tBDD ≤ 15 ns guarantees sub-cycle data coherency. |
| Avionics Sensor Fusion Hub | Medical Imaging Pipeline Memory |
Use Scenario: Radar and inertial sensor processors concurrently access fused navigation state vectors in safety-critical flight systems. IC Role / Device Role / Timing Role: Industrial-grade SRAM provides radiation-tolerant, deterministic memory with semaphore-based resource locking. Use Value: –40°C to +85°C operation and ISB3 ≤15 mA standby support DO-254 compliance and thermal management. | Use Scenario: CT scanner FPGA acquires raw projection data while DSP subsystem processes reconstructed slices. IC Role / Device Role / Timing Role: Dual-port interface buffers gigapixel frame data between acquisition and processing pipelines. Use Value: 128K × 18 capacity and 15 ns access sustain >200 MB/s sustained throughput without pipeline stalls. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1370D-167BAXI | 128K × 18, 167 MHz (≈6 ns), 3.3 V only I/O, no OPT pin; 256-ball BGA | Higher speed but fixed 3.3 V I/O; lacks per-port voltage flexibility and semaphore registers | Choose for pure speed-critical designs where mixed-voltage I/O and hardware semaphores are unnecessary |
| AS7C3256A-15JIN | 128K × 16, 15 ns, single-port only, 3.3 V, 44-pin SOJ; no arbitration or semaphore logic | No dual-port capability; requires external arbitration and synchronization logic | Choose only for cost-sensitive, non-concurrent-access applications where dual-port functionality is not required |
Compared with CY7C1370D-167BAXI and AS7C3256A-15JIN, the 70V639S15BF8 uniquely delivers per-port I/O voltage selection, integrated semaphore registers, and hardware BUSY arbitration-all within a 208-ball BGA footprint suitable for industrial thermal and reliability requirements.
Availability
70V639S15BF8 is available at Aetrix Electronics and suitable for industrial PLC data exchange, real-time motion control buffering, avionics sensor fusion, and medical imaging pipeline memory requiring stable component supply across extended product lifecycles.
Supply support for 70V639S15BF8 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 semiconductor company specializing in timing, memory interface, RF, and high-performance memory solutions for communications, computing, and industrial markets.
The IDT70V639 product line was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems-emphasizing hardware arbitration, semaphore support, and industrial temperature reliability.
FAQ
What is the maximum operating temperature range for the 70V639S15BF8?
The 70V639S15BF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including access time (tRC ≤ 15 ns), BUSY timing (tBDD ≤ 15 ns), and standby current (ISB3 ≤ 15 mA), making it suitable for harsh-environment applications such as factory automation and outdoor infrastructure equipment.
Does the 70V639S15BF8 support JTAG boundary-scan testing?
Yes, the 70V639S15BF8 supports IEEE 1149.1 JTAG boundary-scan testing-but only in the 208-ball BGA (BF208) and 256-ball BGA (BC256) packages. JTAG is explicitly excluded from the 128-pin TQFP variant due to pin count limitations, as confirmed in the official IDT datasheet (DSC-5621/8, p.1).
How does the M/S pin affect BUSY signal behavior in the 70V639S15BF8?
When M/S = VIH, the 70V639S15BF8 operates as a Master and drives BUSYL/BUSYR as output flags indicating port contention. When M/S = VIL, it operates as a Slave and accepts BUSYL/BUSYR as input signals-enabling daisy-chained arbitration in multi-device configurations. This dual-mode behavior is fundamental to its Master/Slave cascading capability.
Can both ports of the 70V639S15BF8 operate at different I/O voltages simultaneously?
Yes-the 70V639S15BF8 supports independent I/O voltage selection per port via OPTL and OPTR pins. Setting OPTL = VIH and OPTR = VIL configures the left port for 3.3 V I/O levels (VDDQL = 3.3 V) and the right port for 2.5 V I/O levels (VDDQR = 2.5 V), enabling seamless interfacing with mixed-voltage SoCs or FPGAs.
What is the function of the semaphore registers in the 70V639S15BF8?
The 70V639S15BF8 includes eight hardware semaphore flags accessible via A0–A2 address lines and controlled by SEM pins. These registers provide atomic lock/unlock operations across ports-allowing one processor to claim exclusive access to shared resources (e.g., peripherals or memory regions) without software polling or race conditions.
70V639S15BF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 208-LFBGA
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 2.25Mbit
- Memory Organization:
- 128K 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:
- 208-CABGA (15x15)
70V639S15BF8 FAQ
1.How can I place an order for 70V639S15BF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V639S15BF8 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 70V639S15BF8 reliable?
The price and inventory of 70V639S15BF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S15BF8 is usually 5 days.
3.What payment methods are accepted for 70V639S15BF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S15BF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V639S15BF8?
70V639S15BF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V639S15BF8 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 70V639S15BF8?
For technical support, including 70V639S15BF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S15BF8 requirements.
6.How does Aetrix verify that 70V639S15BF8 is sourced from the original manufacturer or authorized distributors?
All 70V639S15BF8 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 70V639S15BF8 meets industry standards.
7.What is the process for return or replacement of 70V639S15BF8?
All 70V639S15BF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S15BF8, 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 70V639S15BF8 part is unused and in its original packaging.
Return procedure for 70V639S15BF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V639S15BF8 Tags
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