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Renesas 70V631S12PRF8
- Part No.:
- 70V631S12PRF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 128-LQFP
- Datasheet:
-
70V631S12PRF8.pdf
- Description:
- IC SRAM 4.5MBIT PARALLEL 128TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,992
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Product details
Overview
70V631S12PRF8 from Integrated Device Technology (IDT) is a high-speed, fully asynchronous 256K × 18 dual-port static RAM with independent left/right ports, 12 ns maximum access time (industrial grade), 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins - used in real-time inter-processor communication, FPGA co-processor buffering, and legacy bus arbitration systems requiring simultaneous read/write access to shared memory.
For engineers reviewing the 70V631S12PRF8 datasheet, 70V631S12PRF8 pinout, 70V631S12PRF8 application, or 70V631S12PRF8 equivalent, this page delivers verified technical context, validated pin functions for the 128-pin TQFP package, true dual-port arbitration behavior, BUSY/INT/SEM timing constraints, and direct alternatives for 256K×18 asynchronous SRAM migration paths.
Technical Context
The 70V631S12PRF8 implements true dual-port SRAM cells enabling concurrent read/write access to identical memory locations without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag assertion (M/S = VIH) or BUSY input synchronization (M/S = VIL), with tBDD ≤ 12 ns ensuring valid data delivery after port-to-port write-read delay.
Each port supports independent I/O voltage selection (3.3 V or 2.5 V) via dedicated OPTL/OPTR pins, with corresponding VDDQL/VDDQR supplies. JTAG is omitted in the 128-pin TQFP variant per datasheet note, while semaphore and interrupt flags (SEML/SEMR, INTL/INTR) are implemented as dedicated totem-pole outputs with defined set/clear addresses (3FFFE/3FFFF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 18 bits (4,608 Kbit total); enables 36-bit+ word expansion via Master/Slave cascading |
| Access Time (tAA) | 12 ns max (industrial −40°C to +85°C); guarantees deterministic latency for real-time control loops |
| Core Supply (VDD) | 3.3 V ±150 mV; fixed core voltage independent of I/O selection |
| I/O Supply (VDDQ) | Selectable 3.3 V ±150 mV or 2.5 V ±100 mV per port; allows mixed-voltage system interfacing |
| Operating Temperature | −40°C to +85°C (industrial grade); qualified for embedded industrial controllers and telecom line cards |
| Package | 128-pin TQFP (14 mm × 20 mm × 1.4 mm); compatible with standard reflow profiles and automated optical inspection |
| Standby Current (ISB3) | 3–15 mA (both ports in full CMOS standby); enables low-power hold mode during processor sleep states |
Pinout & Package
70V631S12PRF8 is packaged in a 128-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 20 mm × 1.4 mm. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR logic level (VIH → 3.3 V, VIL → 2.5 V); all VSS pins connect to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L / A0R–A17R | Address Inputs (Left/Right) | 18-bit address per port; supports full 256K depth addressing independently |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data (Left/Right) | 18-bit parallel data bus per port; byte-selectable via LBL/UBL and LBR/UBR |
| CE0L/CE1L / CE0R/CE1R | Chip Enable Pairs | Dual CE per port enables depth expansion without external logic; CE0=VIL & CE1=VIH activates port |
| R/WL / R/WR | Read/Write Control | Active-low write enable; determines direction when OE is active |
| OEL / OER | Output Enable | Controls tri-state of I/O drivers; required for read operations |
| BUSYL / BUSYR | Busy Flag (I/O) | Master: output indicating port contention; Slave: input disabling writes until deasserted |
| SEML / SEMR | Semaphore Enable | Enables 8-bit semaphore register access at A0–A2; supports mutual exclusion between ports |
| INTL / INTR | Interrupt Flag | Open-drain/totem-pole output; set/cleared by writing to address 3FFFE/3FFFF on opposite port |
| M/S | Master/Slave Select | VIH = Master (BUSY output); VIL = Slave (BUSY input); defines arbitration role in cascaded systems |
| OPTL / OPTR | I/O Voltage Select | VIH → 3.3 V I/O levels & VDDQX = 3.3 V; VIL → 2.5 V I/O levels & VDDQX = 2.5 V |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent access to same memory location eliminates software arbitration overhead in multi-core systems |
| Configurable I/O Voltage per Port | OPTL/OPTR pins allow left port at 3.3 V and right port at 2.5 V - critical for bridging legacy and modern logic families |
| Hardware Semaphore Support | On-chip 8-bit semaphore register (A0–A2) enables atomic flag exchange without CPU intervention or external latches |
| Automatic Power-Down | CE0/CE1-controlled standby reduces current to 3–15 mA (ISB3), extending battery life in portable test equipment |
| Master/Slave Cascading | M/S pin and BUSY signaling permit seamless expansion to 36-bit+ data width using multiple 70V631S12PRF8 devices |
Applications
| Industrial PLC Backplane Buffer | FPGA-CPU Shared Memory Interface |
|---|---|
Use Scenario: Real-time motion controller exchanges position commands and sensor feedback with multiple I/O modules over a deterministic backplane bus. IC Role / Device Role / Timing Role: 70V631S12PRF8 acts as a non-blocking shared memory buffer between PLC CPU and fieldbus ASICs, with BUSY arbitration preventing race conditions during concurrent updates. Use Value: 12 ns access time ensures sub-microsecond response to encoder interrupts; dual-port operation eliminates polling delays in cyclic executive tasks. |
Use Scenario: High-speed image processing pipeline where FPGA performs pixel-level filtering and ARM CPU handles metadata and compression. IC Role / Device Role / Timing Role: 70V631S12PRF8 serves as zero-wait-state frame buffer - FPGA writes processed frames while CPU reads completed buffers, coordinated via SEM/INT signals. Use Value: Independent 3.3 V/2.5 V I/O enables FPGA (3.3 V) and CPU (2.5 V) to interface directly without level shifters, reducing BOM cost and signal integrity risk. |
| Telecom Line Card Packet Buffer | Avionics Sensor Fusion Hub |
Use Scenario: SONET/SDH framer ASIC buffers incoming/outgoing ATM cells before forwarding to switching fabric or PHY layer. IC Role / Device Role / Timing Role: 70V631S12PRF8 provides full-duplex packet storage - one port handles ingress cell assembly, the other manages egress scheduling - with no internal arbitration latency. Use Value: Industrial temperature rating (−40°C to +85°C) and 12 ns access ensure reliable operation in uncooled line card enclosures; BUSY flag prevents cell corruption during burst traffic peaks. |
Use Scenario: Flight control computer aggregates inertial, GPS, and barometric data from distributed sensors across redundant CAN and ARINC buses. IC Role / Device Role / Timing Role: 70V631S12PRF8 functions as a time-stamped sensor fusion buffer - left port receives raw IMU samples, right port supplies fused state vectors to flight management software. Use Value: Hardware semaphore support guarantees atomic update of navigation state variables; M/S cascading enables expansion to 36-bit precision for extended Kalman filter coefficients. |
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 | 256K × 18, 12 ns, 3.3 V core/I/O; no per-port VDDQ selection; integrated JTAG boundary scan | Lacks independent I/O voltage control; requires uniform 3.3 V system; JTAG adds testability but consumes pins | Choose when JTAG debug visibility is prioritized over mixed-voltage flexibility and pin count is not constrained |
| AS7C3256B-12JIN | 256K × 18, 12 ns, 3.3 V only; no BUSY arbitration logic; no semaphore/interrupt flags; TQFP-100 package | Requires external arbitration logic; no hardware mutual exclusion; smaller footprint but lower feature density | Choose for cost-sensitive, single-master systems where arbitration is handled in firmware or external CPLD |
Compared with CY7C1362BV33-12BGXI and AS7C3256B-12JIN, the 70V631S12PRF8 uniquely delivers per-port I/O voltage selection and integrated BUSY/SEM/INT hardware - reducing PCB complexity in heterogeneous voltage systems and eliminating external arbitration components in real-time inter-processor designs.
Availability
70V631S12PRF8 is available at Aetrix Electronics and suitable for industrial PLC backplanes, FPGA-CPU shared memory interfaces, and telecom line card packet buffers requiring stable component supply across extended product lifecycles.
Supply support for 70V631S12PRF8 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 timing, memory interface, and RF power solutions for communications, computing, and industrial markets.
The 70V631S12PRF8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, engineered for deterministic, low-latency inter-processor communication in mission-critical embedded systems where software arbitration introduces unacceptable jitter.
FAQ
What is the maximum operating temperature range for the 70V631S12PRF8?
The 70V631S12PRF8 is rated for industrial temperature operation from −40°C to +85°C, as confirmed in the "Recommended Operating Temperature and Supply Voltage" table (page 7). This specification applies to the 70V631S12PRF8 variant and is validated across all AC and DC electrical parameters in the datasheet.
Does the 70V631S12PRF8 support JTAG boundary scan?
No, the 70V631S12PRF8 in the 128-pin TQFP package does not support JTAG boundary scan. The datasheet explicitly states: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package" (page 1, Features section). JTAG pins (TMS, TCK, TDI, TDO, TRST) are present but non-functional in this package variant.
How does the BUSY signal function in Master vs. Slave configuration for the 70V631S12PRF8?
When M/S = VIH, the 70V631S12PRF8 operates as Master and asserts BUSY as an output to block writes on the opposing port during address contention. When M/S = VIL, it operates as Slave and treats BUSY as an input - writes are inhibited until BUSY goes high. This behavior is defined in Note 1 on page 2 and timing waveforms on pages 15–16.
Can both ports of the 70V631S12PRF8 operate at different I/O voltages simultaneously?
Yes. The 70V631S12PRF8 supports independent I/O voltage selection: 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). The datasheet confirms "both ports can operate at 3.3V levels, both can operate at 2.5V levels, or either can operate at 3.3V with the other at 2.5V" (page 5, Pin Names note 2).
What is the purpose of the semaphore function in the 70V631S12PRF8?
The semaphore function in the 70V631S12PRF8 provides eight hardware-managed flags accessible via A0–A2 addresses, enabling atomic mutual exclusion between ports. Writing to I/O0 updates the flag; reading returns the value on all I/O lines. This eliminates race conditions in shared resource access without CPU polling or external logic, as detailed in Truth Table II (page 6) and Functional Description (page 18).
70V631S12PRF8 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:
- 4.5Mbit
- Memory Organization:
- 256K 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:
- 128-TQFP (14x20)
70V631S12PRF8 FAQ
1.How can I place an order for 70V631S12PRF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V631S12PRF8 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 70V631S12PRF8 reliable?
The price and inventory of 70V631S12PRF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S12PRF8 is usually 5 days.
3.What payment methods are accepted for 70V631S12PRF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S12PRF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V631S12PRF8?
70V631S12PRF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V631S12PRF8 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 70V631S12PRF8?
For technical support, including 70V631S12PRF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S12PRF8 requirements.
6.How does Aetrix verify that 70V631S12PRF8 is sourced from the original manufacturer or authorized distributors?
All 70V631S12PRF8 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 70V631S12PRF8 meets industry standards.
7.What is the process for return or replacement of 70V631S12PRF8?
All 70V631S12PRF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S12PRF8, 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 70V631S12PRF8 part is unused and in its original packaging.
Return procedure for 70V631S12PRF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V631S12PRF8 Tags
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M24C02-WMN6TP
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