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Renesas 70V639S10PRF8
- Part No.:
- 70V639S10PRF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 128-LQFP
- Datasheet:
-
70V639S10PRF8.pdf
- Description:
- IC SRAM 2.25MBIT PAR 128TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
70V639S10PRF8 from IDT (Integrated Device Technology) is a high-speed, asynchronous dual-port static RAM with 128K × 18-bit organization (2,304 Kbit), supporting simultaneous independent read/write access on left and right ports. It operates from a 3.3V core supply with independently selectable 3.3V or 2.5V I/O voltage per port via OPTL/OPTR pins, features on-chip arbitration logic, semaphore signaling, and BUSY/INT flags - enabling real-time inter-processor communication in embedded control systems.
For engineers reviewing the 70V639S10PRF8 datasheet, 70V639S10PRF8 pinout, 70V639S10PRF8 application, or 70V639S10PRF8 equivalent, this device is selected for deterministic low-latency memory sharing between two asynchronous masters - especially where bus-matching, depth/width expansion, and hardware semaphore coherency are required without external logic.
Technical Context
The 70V639S10PRF8 implements true dual-port SRAM cells with fully independent address, data, and control paths per port. Its arbitration logic resolves contention via BUSY flag assertion (Master mode) or BUSY input sampling (Slave mode), while semaphore registers (A0–A2 addressed) provide eight hardware-managed mutual-exclusion flags accessible across both ports.
It supports JTAG IEEE 1149.1 boundary-scan only in BGA packages (not TQFP), and uses separate byte enables (UBL/LBL, UBR/LBR) to enable 9-bit sub-word writes. The M/S pin configures master/slave behavior for cascaded 36-bit+ memory systems, with automatic power-down triggered by CE0/CE1 deassertion.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 128K × 18 bits (2,304 Kbit); enables 36-bit word systems via Master/Slave cascading |
| Access Time (max) | 10 ns - guarantees sub-100 MHz synchronous interface compatibility with tight timing margins |
| Supply Voltages | VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 2.5 V ±100 mV or 3.3 V ±150 mV (I/O, per port) |
| Operating Temperature | Commercial grade: 0°C to +70°C - validated for stable operation in non-extended ambient environments |
| Package | 128-pin TQFP (PK128), 14 mm × 20 mm body, 0.5 mm pitch - compatible with standard SMT reflow profiles |
| I/O Voltage Flexibility | OPTL/OPTR pins independently configure left/right port I/O voltage (2.5 V or 3.3 V) - eliminates level-shifter requirements in mixed-voltage systems |
| Arbitration Support | Hardware BUSY flag (M/S = VIH) and semaphore logic (SEML/SEMR) - ensures deterministic conflict resolution without software polling |
Pinout & Package
70V639S10PRF8 is housed in a 128-pin Thin Quad Flatpack (PK128) package with 0.5 mm lead pitch, 14 mm × 20 mm body size, and exposed thermal pad (not electrically connected). All VDD pins require 3.3 V supply; VDDQL/VDDQR must match OPTL/OPTR configuration (2.5 V or 3.3 V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A16L / A0R–A16R | Address Inputs (Left/Right) | 17-bit address per port; accesses full 128K depth (217 = 131,072 words) |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data (Left/Right) | 18-bit parallel I/O per port; supports byte-select writes via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enables (Left/Right) | Dual CE per port enables depth expansion without external decoding logic |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write enable; determines direction of data transfer on respective port |
| OEL / OER | Output Enable (Left/Right) | Tri-states I/O drivers when deasserted; allows shared bus usage |
| UBL, LBL / UBR, LBR | Upper/Lower Byte Select (Left/Right) | Enables 9-bit sub-word access - critical for byte-aligned peripheral interfacing |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates hardware semaphore register access (A0–A2) for inter-port synchronization |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Output when M/S = VIH (Master); input when M/S = VIL (Slave) - enforces atomic access |
| INTL / INTR | Interrupt Flag (Left/Right) | Open-drain, non-tri-state output; signals event completion (e.g., semaphore grant or address match) |
| M/S | Master/Slave Select | VIH configures BUSY as output (Master); VIL configures BUSY as input (Slave) - defines arbitration role |
| OPTL / OPTR | I/O Voltage Option (Left/Right) | VIL selects 2.5 V I/O; VIH selects 3.3 V I/O - sets VDDQL/VDDQR voltage domain per port |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write to same memory location - eliminates software serialization overhead in multi-CPU systems |
| Configurable I/O Voltage per Port | Independent 2.5 V / 3.3 V operation on left/right ports - avoids external level shifters in heterogeneous bus environments |
| Hardware Semaphore Logic | Eight dedicated flags (A0–A2 addressed) with atomic read/write - provides lock-free inter-processor coordination |
| On-Chip Arbitration & BUSY Flag | Automatic BUSY assertion on address/contention conflict - prevents data corruption without CPU intervention |
| Master/Slave Cascading Support | M/S pin enables 36-bit+ word systems using multiple devices - removes need for external glue logic in wide-data applications |
| Low-Power Standby Modes | ISB3 ≤ 15 mA (full standby, CMOS inputs) - reduces system power during idle periods without sacrificing wake-up latency |
Applications
| Industrial PLC Communication Hub | Real-Time Signal Processing Bridge |
|---|---|
|
Use Scenario: Two independent microcontrollers exchange sensor data and control commands in an industrial programmable logic controller. IC Role / Device Role / Timing Role: Shared memory buffer with hardware arbitration - acts as deterministic inter-processor mailbox. Use Value: Eliminates software polling and race conditions; 10 ns access time ensures sub-microsecond message handoff. |
Use Scenario: FPGA-based signal processor and ARM host CPU share streaming ADC/DAC buffers in medical imaging equipment. IC Role / Device Role / Timing Role: Asynchronous data bridge - decouples clock domains while preserving sample integrity. Use Value: Independent port timing prevents FIFO overflow; byte enables support partial-frame updates without full-word transfers. |
| Avionics Data Concentrator | Automotive ADAS Sensor Fusion Module |
|
Use Scenario: Multiple flight control computers access shared navigation state variables and fault logs in DO-254-compliant avionics. IC Role / Device Role / Timing Role: Safety-critical shared memory with hardware semaphore protection - ensures atomic read-modify-write operations. Use Value: Built-in semaphores replace software locks; BUSY flag guarantees deterministic worst-case response under contention. |
Use Scenario: Radar, camera, and ultrasonic ECUs coordinate object tracking data in autonomous driving systems. IC Role / Device Role / Timing Role: Real-time fusion buffer - synchronizes timestamped sensor metadata across heterogeneous processors. Use Value: 128K × 18 capacity stores >100 frames of fused metadata; 2.5 V/3.3 V I/O flexibility interfaces directly with mixed-voltage SoCs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-10ZXC | 128K × 18, 10 ns, 3.3 V only (no 2.5 V I/O option); no M/S pin or cascading support | Lacks per-port voltage selection and Master/Slave expansion - requires external logic for 36-bit systems | Select when I/O voltage is fixed at 3.3 V and depth expansion is handled externally |
| AS7C3128B-10TIN | 128K × 18, 10 ns, 3.3 V core/I/O; no semaphore, no BUSY arbitration, no JTAG | No hardware coherency primitives - relies entirely on software protocols for inter-processor sync | Select for cost-sensitive applications where arbitration is managed in firmware and timing margins are relaxed |
Compared with CY7C1362BV33-10ZXC and AS7C3128B-10TIN, the 70V639S10PRF8 uniquely integrates per-port I/O voltage selection, hardware semaphore registers, and Master/Slave cascading - reducing BOM count and firmware complexity in multi-processor real-time systems.
Availability
70V639S10PRF8 is available at Aetrix Electronics and suitable for industrial PLC communication hubs, real-time signal processing bridges, avionics data concentrators, and automotive ADAS sensor fusion modules requiring stable component supply and long-term obsolescence management.
Supply support for 70V639S10PRF8 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, specialized in high-performance timing, memory, and interface ICs for communications, computing, and industrial markets before acquisition.
The IDT70V639S product line was engineered for deterministic inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, flexible I/O voltage, and seamless memory expansion without external logic.
FAQ
What is the maximum operating frequency supported by the 70V639S10PRF8?
The 70V639S10PRF8 does not operate on a clock signal - it is an asynchronous dual-port SRAM. Its performance is specified by access time: 10 ns maximum (commercial grade), enabling reliable operation in systems with read/write cycles ≥100 MHz. Timing is governed by tRC (read cycle time), tWC (write cycle time), and related AC parameters - not a clock frequency.
Does the 70V639S10PRF8 support JTAG boundary-scan testing?
No, the 70V639S10PRF8 in the PK128 (128-pin TQFP) package does not support JTAG. Per the datasheet, JTAG compliance per IEEE 1149.1 is only implemented in the 208-ball and 256-ball BGA variants (e.g., 70V639S10BF, 70V639S10BC). The TQFP package lacks dedicated TMS/TCK/TDO/TDI pins.
How does the M/S pin affect BUSY functionality in the 70V639S10PRF8?
In the 70V639S10PRF8, the M/S pin configures BUSY behavior: when M/S = VIH, BUSYL/BUSYR are outputs that assert during port contention; when M/S = VIL, BUSYL/BUSYR become inputs used to detect busy status from a master device. This enables hierarchical arbitration in multi-device systems without external logic.
Can the left and right ports of the 70V639S10PRF8 operate at different I/O voltages?
Yes - the 70V639S10PRF8 supports independent I/O voltage selection per port. OPTL sets left-port I/O voltage (2.5 V or 3.3 V); OPTR sets right-port I/O voltage. Corresponding VDDQL and VDDQR supplies must match the selected levels. This allows direct interfacing with mixed-voltage processors (e.g., 2.5 V FPGA + 3.3 V MCU).
What is the purpose of the semaphore feature in the 70V639S10PRF8?
The semaphore feature in the 70V639S10PRF8 provides eight hardware-managed mutual-exclusion flags (addressed via A0–A2) accessible from either port. When SEML or SEMR is asserted, the device enters semaphore mode - allowing atomic read/write of these flags to coordinate resource access between processors without software race conditions.
70V639S10PRF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 128-LQFP
- 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:
- 10ns
- Access Time:
- 10 ns
- Voltage - Supply:
- 3.15V ~ 3.45V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 128-TQFP (14x20)
70V639S10PRF8 FAQ
1.How can I place an order for 70V639S10PRF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V639S10PRF8 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 70V639S10PRF8 reliable?
The price and inventory of 70V639S10PRF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S10PRF8 is usually 5 days.
3.What payment methods are accepted for 70V639S10PRF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S10PRF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V639S10PRF8?
70V639S10PRF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V639S10PRF8 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 70V639S10PRF8?
For technical support, including 70V639S10PRF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S10PRF8 requirements.
6.How does Aetrix verify that 70V639S10PRF8 is sourced from the original manufacturer or authorized distributors?
All 70V639S10PRF8 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 70V639S10PRF8 meets industry standards.
7.What is the process for return or replacement of 70V639S10PRF8?
All 70V639S10PRF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S10PRF8, 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 70V639S10PRF8 part is unused and in its original packaging.
Return procedure for 70V639S10PRF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V639S10PRF8 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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