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Renesas 70V639S12BFGI8
- Part No.:
- 70V639S12BFGI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 208-LFBGA
- Datasheet:
-
70V639S12BFGI8.pdf
- Description:
- IC SRAM 2.25MBIT PAR 208CABGA
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
70V639S12BFGI8 from Integrated Device Technology is a high-speed 128K × 18 asynchronous dual-port static RAM with fully independent left/right ports, 12 ns max access time (industrial grade), 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 and supports master/slave cascading for 36-bit+ bus expansion in real-time inter-processor communication systems.
For engineers reviewing the 70V639S12BFGI8 datasheet, 70V639S12BFGI8 pinout, 70V639S12BFGI8 application, or 70V639S12BFGI8 equivalent, key selection criteria include dual-port arbitration timing (tAPS = 5 ns), BUSY flag behavior under M/S = VIH/VIL, semaphore update pulse width (tSOP ≤ 6 ns), and compatibility with industrial temperature operation (–40°C to +85°C) in BGA packaging.
Technical Context
The 70V639S12BFGI8 implements true dual-port SRAM cells with on-chip arbitration logic that resolves port contention using address-match and chip-enable priority schemes. Its BUSY signaling operates in two modes: as an output (M/S = VIH) when configured as Master, or as an input (M/S = VIL) when configured as Slave - enabling deterministic inter-port synchronization without external logic.
Each port features independent byte controls (UBL/LBR, UBL/LBL), separate CE0/CE1 enables, and full JTAG support (IEEE 1149.1) except on TQFP packages. The device supports mixed-voltage I/O operation: OPTL and OPTR independently configure left/right port VDDQ to either 3.3 V (±150 mV) or 2.5 V (±100 mV), while VDD remains fixed at 3.3 V for the core.
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) | 12 ns - guarantees worst-case read latency for industrial-grade timing-critical control loops |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded systems without derating |
| I/O Voltage Options | Selectable 3.3 V or 2.5 V per port via OPTL/OPTR - enables interfacing with mixed-voltage ASIC/FPGA subsystems |
| Arbitration Priority Setup | tAPS = 5 ns - minimum setup time required before address match to ensure deterministic BUSY assertion |
| Semaphore Pulse Width | tSOP ≤ 6 ns - maximum duration for semaphore flag update, critical for low-latency resource locking |
| Core Supply Voltage | VDD = 3.3 V ± 150 mV - fixed core rail; decoupling must meet 3.3 V LVTTL noise margin requirements |
Pinout & Package
70V639S12BFGI8 is packaged in a 208-ball fine-pitch Ball Grid Array (FBGA), code BF208, with 0.8 mm ball pitch and 15 mm × 15 mm body. Pin functions are strictly defined per port (left/right), with dedicated arbitration (SEML/SEMR), interrupt (INTL/INTR), and BUSY (BUSYL/BUSYR) signals. All VDD pins require 3.3 V; VDDQL/VDDQR must match OPTL/OPTR configuration (3.3 V or 2.5 V).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A16L / A0R–A16R | Address Inputs (Left/Right) | 17-bit address bus per port; enables full 128K depth addressing independently |
| I/O0L–I/O17L / I/O0R–I/O17R | Bidirectional Data I/O (Left/Right) | 18-bit data path per port; supports byte-wide writes via UBL/LBL and UBR/LBR |
| CE0L, CE1L / CE0R, CE1R | Chip Enable Inputs (Left/Right) | Dual CE per port allows depth expansion without external logic; CE0L=VIH & CE1L=VIL disables left port |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write enable; determines direction of data transfer on respective I/O bus |
| OEL / OER | Output Enable (Left/Right) | Controls tri-state of I/O drivers; required for read operations and bus sharing |
| SEML / SEMR | Semaphore Enable (Left/Right) | Enables access to 8-bit semaphore register (addressed by A0–A2); used for inter-port resource locking |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Output when M/S=VIH (Master); input when M/S=VIL (Slave); asserts during port contention on matching addresses |
| M/S | Master/Slave Select | Configures device role: VIH → BUSY output + arbitration master; VIL → BUSY input + arbitration slave |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Simultaneous independent access to identical memory locations - eliminates software serialization in multi-CPU systems |
| On-Chip Port Arbitration | Hardware-resolved contention via address-match detection and tAPS-controlled priority - no external arbitration logic needed |
| Configurable I/O Voltage | OPTL/OPTR pins set VDDQL/VDDQR to 3.3 V or 2.5 V independently - simplifies interface to heterogeneous logic families |
| Full Semaphore Support | Eight dedicated flags accessible via A0–A2 and SEM control - enables atomic lock/unlock across ports without CPU intervention |
| Industrial Temperature Range | –40°C to +85°C operation with guaranteed 12 ns access - suitable for motor drives, PLCs, and avionics edge nodes |
| Low-Power Standby Modes | ISB3 ≤ 15 mA (full standby, CMOS inputs) - reduces system power during idle cycles without losing memory state |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processing Buffering |
|---|---|
Use Scenario: Two DSPs exchange processed audio frames via shared memory with minimal latency and no bus contention. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state buffer with hardware arbitration ensuring deterministic frame handoff. Use Value: Eliminates need for handshake protocols or external FIFOs; tWDD ≤ 25 ns ensures sub-30 ns port-to-port write-read delay. |
Use Scenario: An FPGA-based FFT engine streams time-domain samples into one port while reading frequency-domain results from the other. IC Role / Device Role / Timing Role: Asynchronous dual-port RAM serves as ping-pong buffer with independent clock domains on each port. Use Value: Enables continuous data flow without pipeline stalls; 12 ns access supports >83 MHz sample rates in 128K-depth buffers. |
| Industrial Motion Controller Shared Memory | Redundant Safety PLC Data Exchange |
Use Scenario: A safety-certified motion controller shares trajectory data between primary and watchdog CPUs for cross-checking. IC Role / Device Role / Timing Role: Dual-port RAM provides fault-tolerant shared workspace with BUSY-flag synchronization to prevent race conditions. Use Value: Hardware-enforced atomicity via semaphore flags (tSOP ≤ 6 ns) meets SIL-3 functional safety timing constraints. |
Use Scenario: Dual-channel safety PLCs maintain synchronized state tables using mirrored memory regions accessed via left/right ports. IC Role / Device Role / Timing Role: Acts as coherent shared memory with master/slave arbitration (M/S pin) enabling failover coordination. Use Value: tBDD ≤ 12 ns ensures valid read data within 12 ns after BUSY deassertion - critical for <100 µs diagnostic cycle times. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1371BV25-12BGXI | 128K × 18, 12 ns, 2.5 V core + I/O; no M/S pin or BUSY arbitration mode; uses INT pin only | Lacks hardware BUSY arbitration and master/slave configuration - requires external logic for contention resolution | Choose when system already implements arbitration externally and 2.5 V core simplifies power design |
| AS7C3128B-12JIN | 128K × 18, 12 ns, 3.3 V only; no semaphore, no JTAG, no byte-select controls; simpler pinout (128-pin TQFP) | No inter-port synchronization primitives - limited to basic dual-port buffering without resource locking | Choose for cost-sensitive designs where semaphore/BUSY features are unused and TQFP layout is preferred |
Compared with CY7C1371BV25-12BGXI and AS7C3128B-12JIN, the 70V639S12BFGI8 uniquely integrates configurable BUSY arbitration, per-port voltage selection, and IEEE 1149.1 JTAG - making it the only option supporting deterministic real-time inter-processor synchronization in industrial temperature environments without external glue logic.
Availability
70V639S12BFGI8 is available at Aetrix Electronics and suitable for industrial motion control, redundant safety PLCs, real-time DSP buffering, and multi-CPU communication systems requiring stable component supply across extended product lifecycles.
Supply support for 70V639S12BFGI8 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 solutions for communications, computing, and industrial markets.
The IDT70V639S product line delivers asynchronous dual-port SRAMs optimized for deterministic real-time inter-processor communication, featuring hardware arbitration, semaphore support, and industrial-grade reliability - targeting embedded control, test equipment, and safety-critical systems.
FAQ
What is the operating temperature range supported by the 70V639S12BFGI8?
The 70V639S12BFGI8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated across all electrical parameters including 12 ns maximum access time, BUSY arbitration timing (tAPS = 5 ns), and standby current (ISB3 ≤ 15 mA). It does not support extended or military temperature grades.
How does the M/S pin affect BUSY signal behavior in the 70V639S12BFGI8?
In the 70V639S12BFGI8, the M/S pin configures BUSY functionality: when M/S = VIH, BUSYL/BUSYR operate as totem-pole outputs indicating port contention; when M/S = VIL, they become inputs accepting external BUSY signals from another device. This enables flexible master/slave topologies without redesigning PCB routing.
Can the left and right ports of the 70V639S12BFGI8 operate at different I/O voltages simultaneously?
Yes - the 70V639S12BFGI8 supports independent I/O voltage selection: OPTL sets VDDQL to 3.3 V or 2.5 V for the left port, and OPTR sets VDDQR accordingly for the right port. Both ports may run at 3.3 V, both at 2.5 V, or one at each voltage, provided corresponding VDDQ supplies match the OPT pin states.
What is the purpose of the semaphore feature in the 70V639S12BFGI8, and how is it accessed?
The 70V639S12BFGI8 includes eight hardware semaphore flags used for atomic resource locking between ports. They are accessed by setting SEM = VIL and CE = VIH, then addressing A0–A2 (0–7) while writing to I/O0 or reading from I/O0–I/O17. The tSOP ≤ 6 ns pulse width ensures fast flag updates critical for low-latency synchronization.
Does the 70V639S12BFGI8 support JTAG boundary-scan testing?
Yes - the 70V639S12BFGI8 implements IEEE 1149.1 JTAG compliance with TDI, TDO, TCK, TMS, and TRST pins. However, JTAG is not supported on the 128-pin TQFP package variant; it is fully functional on the 208-ball FBGA (BF208) and 256-ball BGA (BC256) packages, including the 70V639S12BFGI8.
70V639S12BFGI8 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 208-CABGA (15x15)
70V639S12BFGI8 FAQ
1.How can I place an order for 70V639S12BFGI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V639S12BFGI8 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 70V639S12BFGI8 reliable?
The price and inventory of 70V639S12BFGI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V639S12BFGI8 is usually 5 days.
3.What payment methods are accepted for 70V639S12BFGI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V639S12BFGI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V639S12BFGI8?
70V639S12BFGI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V639S12BFGI8 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 70V639S12BFGI8?
For technical support, including 70V639S12BFGI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V639S12BFGI8 requirements.
6.How does Aetrix verify that 70V639S12BFGI8 is sourced from the original manufacturer or authorized distributors?
All 70V639S12BFGI8 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 70V639S12BFGI8 meets industry standards.
7.What is the process for return or replacement of 70V639S12BFGI8?
All 70V639S12BFGI8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V639S12BFGI8, 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 70V639S12BFGI8 part is unused and in its original packaging.
Return procedure for 70V639S12BFGI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V639S12BFGI8 Tags
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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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