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Renesas 70V631S12PRFGI
- Part No.:
- 70V631S12PRFGI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 128-LQFP
- Datasheet:
-
70V631S12PRFGI.pdf
- Description:
- IC SRAM 4.5MBIT PARALLEL 128TQFP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
70V631S12PRFGI from IDT (now part of Renesas) is a high-speed 256K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns max access time (industrial grade), LVTTL-compatible 3.3 V core supply, and selectable 3.3 V/2.5 V I/O voltage per port via OPT pins. It enables simultaneous read/write to the same memory location in real-time inter-processor communication systems.
For engineers reviewing the 70V631S12PRFGI datasheet, 70V631S12PRFGI pinout, 70V631S12PRFGI application, or 70V631S12PRFGI equivalent, this page delivers verified technical context, validated pin functions for the 128-pin TQFP package, industrial-grade timing specs, true dual-port arbitration behavior, and two confirmed alternative parts for memory expansion or voltage-flexible designs.
Technical Context
The 70V631S12PRFGI implements true dual-port SRAM cells with on-chip arbitration logic, supporting concurrent access without external glue logic. Its M/S pin configures master/slave operation for depth expansion, while BUSY flags coordinate contention resolution between ports.
It features full hardware semaphore signaling across both ports using A0–A2 address lines, plus interrupt flag generation at fixed addresses (3FFFEH/3FFFFH). JTAG support is excluded in the 128-pin TQFP variant due to pin count constraints, unlike larger BGA packages.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 18 bits (4,608 Kbit total); supports 36-bit+ word systems via Master/Slave cascading |
| Access Time (max) | 12 ns - guarantees deterministic latency for real-time inter-processor data exchange at ≤83 MHz effective throughput |
| Operating Temperature | −40°C to +85°C - qualified for industrial embedded control, avionics data buffers, and ruggedized communications equipment |
| Core Supply Voltage | 3.3 V ±150 mV - fixed VDD; decoupling required on all VDD pins per datasheet layout guidelines |
| I/O Supply Voltage | Selectable 3.3 V or 2.5 V per port via OPTL/OPTR - enables mixed-voltage system interfacing without level shifters |
| Standby Current (ISB3) | 3–15 mA - ultra-low full-standby power when both chip enables are inactive and inputs are CMOS-level stable |
| Port Arbitration | Hardware-based BUSY flag with tBDD ≤12 ns - ensures atomic read-modify-write sequences during shared-memory contention |
Pinout & Package
70V631S12PRFGI is packaged in a 128-pin Thin Quad Flatpack (TQFP), body size 14 mm × 20 mm × 1.4 mm, lead pitch 0.4 mm. All VDD pins require 3.3 V supply; VDDQL/VDDQR must match OPTL/OPTR logic levels (3.3 V if VIH, 2.5 V if VIL).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A17L / A0R–A17R | Address Inputs (Left/Right) | 18-bit address bus per port; supports full 256K depth addressing independently |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data Bus (Left/Right) | 18-bit parallel data path; byte-selectable via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enable Pairs | Dual CE per port enables depth expansion without external logic; CE0X=VIL & CE1X=VIH activates port X |
| R/WL / R/WR | Read/Write Control | Active-low write enable; controls direction of data flow on respective I/O bus |
| OEL / OER | Output Enable | Tri-states outputs when high; required for bus sharing in multi-device systems |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | M/S=VIH → BUSYX is output; M/S=VIL → BUSYX is input; resolves port contention |
| SEML / SEMR | Semaphore Enable | Enables 8-bit semaphore register access via A0–A2; supports inter-processor synchronization |
| INTL / INTR | Interrupt Flag Output | Open-drain (non-tri-state totem-pole) flag asserted at fixed addresses 3FFFEH/3FFFFH |
| OPTL / OPTR | I/O Voltage Select | Configures VDDQL/VDDQR supply level: VIH → 3.3 V, VIL → 2.5 V; independent per port |
| M/S | Master/Slave Select | VIH = Master (BUSY output), VIL = Slave (BUSY input); enables daisy-chained memory expansion |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent read/write to identical memory locations - eliminates software locks and enables lock-free IPC |
| Per-Port I/O Voltage Flexibility | Independent 3.3 V/2.5 V selection via OPTL/OPTR - interfaces directly with legacy 2.5 V FPGAs or modern 3.3 V microcontrollers |
| Hardware Semaphore Support | On-chip 8-bit semaphore register accessed via A0–A2 - reduces CPU overhead in multi-core resource management |
| Automatic Power-Down | Sub-15 mA ISB3 current when both CE pairs inactive - extends uptime in battery-backed industrial controllers |
| Depth Expansion Logic | Dual CE0/CE1 per port + M/S pin - enables seamless 36-bit+ word width expansion without external decoding logic |
Applications
| Industrial PLC Data Exchange | Avionics Sensor Fusion Buffer |
|---|---|
Use Scenario: Two independent PLC CPUs share status, command, and diagnostic data in real time with guaranteed atomicity. IC Role / Device Role / Timing Role: Dual-port SRAM acts as coherent shared memory with hardware BUSY arbitration and semaphore signaling. Use Value: Eliminates polling delays and software mutexes; 12 ns access ensures sub-microsecond inter-CPU handshaking. |
Use Scenario: Radar and inertial measurement units feed time-aligned sensor streams into a central flight controller. IC Role / Device Role / Timing Role: High-speed buffer synchronizes heterogeneous sensor data rates using independent left/right port timing. Use Value: Prevents data loss during burst transfers; 256K × 18 capacity accommodates multiple frame buffers with timestamp metadata. |
| Medical Imaging Pipeline Memory | Test Equipment Pattern Generator |
Use Scenario: Real-time MRI reconstruction pipeline requires low-latency transfer between acquisition FPGA and processing DSP. IC Role / Device Role / Timing Role: Acts as zero-wait-state memory bridge; left port connects to FPGA, right to DSP with independent clock domains. Use Value: Enables deterministic 12 ns read/write cycles across clock boundaries - critical for maintaining image fidelity and timing compliance. |
Use Scenario: Automated test systems generate high-speed digital stimulus patterns while capturing response waveforms. IC Role / Device Role / Timing Role: Stores pattern tables and captures results simultaneously using separate ports for stimulus and capture engines. Use Value: 18-bit width supports wide parallel buses; per-port voltage select allows direct interface to 2.5 V ASIC testers and 3.3 V host controllers. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV18-125BZI | 125 MHz (8 ns) max speed; 256K × 18; 3.3 V only I/O; no OPT pin flexibility | Higher bandwidth but lacks per-port voltage selection - unsuitable for mixed-voltage systems | Choose when maximum throughput is prioritized over I/O voltage adaptability |
| AS7C3256A-12JIN | 12 ns access; 256K × 18; single 3.3 V supply; no BUSY/semaphore/interrupt logic | No hardware arbitration or synchronization primitives - requires external logic for multi-processor coordination | Choose for cost-sensitive, single-processor buffer applications where arbitration is handled in firmware |
Compared with CY7C1362BV18-125BZI and AS7C3256A-12JIN, the 70V631S12PRFGI uniquely combines industrial temperature rating, per-port I/O voltage selection, and integrated hardware arbitration - making it optimal for robust, mixed-voltage, multi-processor embedded systems requiring deterministic latency and minimal external components.
Availability
70V631S12PRFGI is available at Aetrix Electronics and suitable for industrial PLC data exchange, avionics sensor fusion, and medical imaging pipeline applications requiring stable component supply, long-term lifecycle support, and traceable sourcing.
Supply support for 70V631S12PRFGI 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
IDT (Integrated Device Technology), now part of Renesas Electronics, specializes in high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The 70V631S12PRFGI belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for real-time inter-processor communication, shared-memory multiprocessing, and deterministic data buffering in harsh-environment systems.
FAQ
What is the operating temperature range of the 70V631S12PRFGI?
The 70V631S12PRFGI is rated for industrial temperature operation from −40°C to +85°C. This specification is explicitly confirmed in the "Recommended Operating Temperature and Supply Voltage" table (page 7) and applies to the 70V631S12PRFGI variant, which uses the "S12" speed grade designation indicating 12 ns max access time under industrial conditions.
Does the 70V631S12PRFGI support JTAG boundary scan?
No, the 70V631S12PRFGI does not support JTAG. The datasheet explicitly states on page 1: "Due to limited pin count, JTAG is not supported on the 128-pin TQFP package." Since the 70V631S12PRFGI is specified with the "RFGI" suffix denoting the 128-pin TQFP industrial-grade package, JTAG functionality is omitted in this variant.
How does the M/S pin affect BUSY signal behavior in the 70V631S12PRFGI?
In the 70V631S12PRFGI, the M/S pin determines BUSY signal direction: when M/S = VIH, BUSYL/BUSYR are outputs used for master arbitration; when M/S = VIL, they become inputs for slave-side BUSY assertion. This is defined in the Pin Names table (page 5) and functional block diagram (page 1), and is essential for configuring cascaded memory systems.
Can both ports of the 70V631S12PRFGI operate at different I/O voltages simultaneously?
Yes. The 70V631S12PRFGI supports independent I/O voltage selection per port via OPTL and OPTR pins. If OPTL = VIH and OPTR = VIL, the left port operates at 3.3 V I/O levels while the right port operates at 2.5 V - enabling direct interfacing with mixed-voltage SoCs or FPGAs without external level shifters.
What is the purpose of the semaphore feature in the 70V631S12PRFGI?
The 70V631S12PRFGI includes an 8-bit hardware semaphore register accessible via A0–A2 and controlled by SEM pins. It enables atomic resource locking between processors - for example, one CPU writes to I/O0 to claim a shared peripheral, and the other reads all I/Os to detect the flag. This eliminates race conditions without software intervention.
70V631S12PRFGI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 128-LQFP
- Packaging:
- Tray
- Product Status:
- Active
- 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 128-TQFP (14x20)
70V631S12PRFGI FAQ
1.How can I place an order for 70V631S12PRFGI through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V631S12PRFGI 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 70V631S12PRFGI reliable?
The price and inventory of 70V631S12PRFGI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V631S12PRFGI is usually 5 days.
3.What payment methods are accepted for 70V631S12PRFGI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V631S12PRFGI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V631S12PRFGI?
70V631S12PRFGI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V631S12PRFGI 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 70V631S12PRFGI?
For technical support, including 70V631S12PRFGI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V631S12PRFGI requirements.
6.How does Aetrix verify that 70V631S12PRFGI is sourced from the original manufacturer or authorized distributors?
All 70V631S12PRFGI 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 70V631S12PRFGI meets industry standards.
7.What is the process for return or replacement of 70V631S12PRFGI?
All 70V631S12PRFGI units undergo pre-shipment inspection (PSI). If there is an issue with 70V631S12PRFGI, 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 70V631S12PRFGI part is unused and in its original packaging.
Return procedure for 70V631S12PRFGI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V631S12PRFGI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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