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Renesas 70V639S12BF8
- Part No.:
- 70V639S12BF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 208-LFBGA
- Datasheet:
-
70V639S12BF8.pdf
- Description:
- IC SRAM 2.25MBIT PAR 208CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,360
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Product details
Overview
IDT70V639S12BF8 from Integrated Device Technology is a high-speed 128K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns maximum access time (commercial & industrial), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPTL/OPTR pins. It enables simultaneous read/write access to the same memory location in real-time networking buffers and FPGA co-processor interconnects.
For engineers reviewing the 70V639S12BF8 datasheet, 70V639S12BF8 pinout, 70V639S12BF8 application, or 70V639S12BF8 equivalent, this page delivers verified timing specs, dual-port arbitration behavior, BUSY/INT flag logic, semaphore signaling implementation, and package-specific pin validation for the 128-pin TQFP (PK128) variant.
Technical Context
The IDT70V639S12BF8 implements true dual-port SRAM architecture with on-chip arbitration logic that resolves port contention using address-match or chip-enable priority schemes. Its M/S pin configures master (BUSY output) or slave (BUSY input) mode for cascaded 36-bit+ memory systems.
Each port supports independent byte controls (UBL/LBR, UBR/LBL), separate CE0/CE1 enables, and full JTAG test capability-though JTAG is explicitly disabled in the PK128 TQFP package due to pin count constraints. Semaphore flags are accessed via A0–A2 with dedicated SEM enable and controlled by CE/SEM polarity inversion.
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 (tAA) | 12 ns max (industrial & commercial); defines minimum address-to-data valid delay under worst-case VDD/VDDQ/temp |
| Supply Voltages | VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O, selected per port by OPTL/OPTR) |
| Operating Temperature | –40°C to +85°C (industrial grade); validated across full range for timing and leakage compliance |
| Port Arbitration | Hardware-based; supports both address-match (tAPS = 5 ns min) and CE-controlled (tBAC/tBDC) BUSY assertion |
| Semaphore Support | Full on-chip hardware semaphore with eight flags addressed by A0–A2; write/read controlled by CE/SEM polarity per Truth Table II |
| Interrupt Logic | Dedicated INTL/INTR flags set/cleared via specific addresses (1FFFEH/1FFFFH); reset requires OE-driven read cycle |
Pinout & Package
70V639S12BF8 is packaged in a 128-pin Thin Quad Flatpack (PK128), body size ≈14 mm × 20 mm × 1.4 mm, 0.5 mm pitch, lead-finish SnPb (EOL as of June 2018). 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).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A16L | Left port address inputs | 17-bit address bus for left-side memory access; A0–A2 also select semaphore flag index |
| I/O0L–I/O17L | Left port bidirectional data | 18-bit data path; direction controlled by R/WL; upper/lower byte enabled by UBL/LBL |
| CE0L, CE1L | Left port chip enables | Active-low dual CE scheme: CE0L = VIL & CE1L = VIH enables port; either CE high disables port |
| R/WL | Left port read/write control | VIH = read, VIL = write; combined with CE and OE to determine mode per Truth Table I |
| OEL | Left port output enable | Active-low; controls tri-state of I/O0L–I/O17L during reads; high-Z when disabled |
| SEML | Left port semaphore enable | Active-low; enables semaphore access mode when CE0L/CE1L inactive (CE = VIH, SEM = VIL) |
| BUSYL | Left port busy flag | Output when M/S = VIH (master), input when M/S = VIL (slave); indicates port contention resolution status |
| INTL | Left port interrupt flag | Open-drain output asserted low when interrupt condition occurs; requires external pull-up |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port cell architecture | Enables simultaneous, independent read/write to identical memory locations without external arbitration logic |
| Configurable I/O voltage per port | OPTL/OPTR pins independently select 3.3 V or 2.5 V I/O levels-supports mixed-voltage system interfacing |
| Hardware semaphore signaling | Eight dedicated flags accessible via A0–A2; eliminates need for external semaphores in multi-processor synchronization |
| Master/Slave cascading support | M/S pin configures BUSY as output (master) or input (slave), enabling depth/width expansion without glue logic |
| Industrial temperature operation | Validated –40°C to +85°C performance including 12 ns access time, standby current (ISB2 ≤ 325 mA), and leakage limits |
Applications
| Telecom Line Card Buffering | FPGA-CPU Co-Processor Interface |
|---|---|
Use Scenario: High-throughput packet buffering between line interface ASIC and network processor in 10G Ethernet line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency shared memory buffer; left port handles ingress traffic, right port handles egress scheduling. Use Value: 12 ns access time ensures sub-100 ns round-trip latency; independent byte enables (UBL/LBL) allow partial writes without disturbing adjacent data. |
Use Scenario: Real-time data exchange between Xilinx Kintex FPGA and ARM Cortex-A9 application processor in embedded vision systems. IC Role / Device Role / Timing Role: Serves as deterministic handshake memory; FPGA writes processed image metadata to RAM, CPU reads via right port with BUSY flag polling. Use Value: Hardware BUSY arbitration prevents race conditions during concurrent access; M/S configuration allows FPGA to act as master controlling BUSY assertion. |
| Industrial PLC Dual-Core Synchronization | Avionics Data Concentrator |
Use Scenario: Shared memory between safety-critical ARM Cortex-R5 lockstep core and non-safety Linux application core in programmable logic controllers. IC Role / Device Role / Timing Role: Provides fault-isolated inter-core communication channel; semaphore flags coordinate task handoff and resource locking. Use Value: On-chip semaphore logic eliminates external latch requirements; industrial temp rating ensures reliability in cabinet-mounted enclosures up to 85°C ambient. |
Use Scenario: Aggregating sensor data from multiple ARINC-429 receivers into a centralized flight management system module. IC Role / Device Role / Timing Role: Acts as time-deterministic FIFO buffer; left port accepts bursty serial data, right port feeds deterministic DMA engine. Use Value: Asynchronous dual-port operation decouples variable input rate from fixed output schedule; 128K × 18 capacity supports >200 ms of 10 kHz sensor sampling at 36-bit precision. |
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 | 128K × 18, 12 ns, 3.3 V core, but only 3.3 V I/O (no 2.5 V option); no M/S pin or hardware semaphore | Lacks per-port voltage selection and semaphore logic-requires external arbitration for multi-processor sync | Select when system uses uniform 3.3 V I/O and implements software semaphore or external arbiter |
| AS7C3128B-12JIN | 128K × 18, 12 ns, 3.3 V only; no dual CE, no semaphore, no BUSY/INT flags; simpler control interface | No hardware arbitration or interrupt signaling-suitable only for single-controller dual-port use cases | Choose for cost-sensitive designs where arbitration is handled externally or unnecessary |
Compared with CY7C1362BV33-12BGXI and AS7C3128B-12JIN, the 70V639S12BF8 uniquely integrates per-port I/O voltage selection, hardware semaphore, and configurable BUSY arbitration-reducing BOM count and PCB area in multi-processor real-time systems.
Availability
70V639S12BF8 is available at Aetrix Electronics and suitable for telecom infrastructure, industrial automation, and avionics applications requiring stable component supply, long-lifecycle support, and guaranteed industrial temperature performance.
Supply support for 70V639S12BF8 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 power solutions for communications and computing markets.
The IDT70V639S product line delivers high-speed asynchronous dual-port SRAMs optimized for real-time inter-processor communication, FPGA co-processing, and deterministic buffering in telecom, industrial, and aerospace systems.
FAQ
What is the maximum operating temperature range for the 70V639S12BF8?
The 70V639S12BF8 is rated for industrial temperature operation from –40°C to +85°C. This range is validated across all key parameters including 12 ns access time, standby current (ISB2 ≤ 325 mA), and DC leakage limits. The device meets these specifications without derating and is suitable for enclosed industrial cabinets and outdoor telecom equipment.
Does the 70V639S12BF8 support JTAG boundary scan?
No, the 70V639S12BF8 in the PK128 TQFP package does not support JTAG. The datasheet explicitly states "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package." JTAG pins (TMS, TCK, TRST, TDI, TDO) are present in BGA variants (BF208, BC256) but omitted or unused in the 128-pin TQFP pinout.
How does the M/S pin affect BUSY functionality in the 70V639S12BF8?
In the 70V639S12BF8, the M/S pin configures BUSY behavior: when M/S = VIH, BUSY is an output flag indicating port contention; when M/S = VIL, BUSY becomes an input used to synchronize slave devices. This enables flexible master/slave cascading for 36-bit+ memory expansion without external logic.
Can both ports of the 70V639S12BF8 operate at different I/O voltages simultaneously?
Yes. The 70V639S12BF8 supports independent I/O voltage selection per port: OPTL sets left-port VDDQL (3.3 V or 2.5 V), and OPTR sets right-port VDDQR (3.3 V or 2.5 V). Both ports may run at 3.3 V, both at 2.5 V, or one at each voltage-enabling seamless interfacing between mixed-voltage subsystems.
What is the purpose of the semaphore feature in the 70V639S12BF8?
The 70V639S12BF8 includes eight hardware semaphore flags accessed via A0–A2. These flags provide atomic resource-locking between ports without software overhead or external components. They are written when CE = VIH and SEM = VIL, and read across all I/O lines-critical for deterministic multi-processor synchronization.
70V639S12BF8 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:
- 12ns
- Access Time:
- 12 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)
70V639S12BF8 FAQ
1.How can I place an order for 70V639S12BF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V639S12BF8 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 70V639S12BF8 reliable?
The price and inventory of 70V639S12BF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S12BF8 is usually 5 days.
3.What payment methods are accepted for 70V639S12BF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S12BF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V639S12BF8?
70V639S12BF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V639S12BF8 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 70V639S12BF8?
For technical support, including 70V639S12BF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S12BF8 requirements.
6.How does Aetrix verify that 70V639S12BF8 is sourced from the original manufacturer or authorized distributors?
All 70V639S12BF8 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 70V639S12BF8 meets industry standards.
7.What is the process for return or replacement of 70V639S12BF8?
All 70V639S12BF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S12BF8, 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 70V639S12BF8 part is unused and in its original packaging.
Return procedure for 70V639S12BF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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