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Renesas 70V659S12BC
- Part No.:
- 70V659S12BC
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70V659S12BC.pdf
- Description:
- IC SRAM 4.5MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,789
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Product details
Overview
70V659S12BC from IDT (Integrated Device Technology) is a high-speed, asynchronous dual-port static RAM with 128K × 36-bit organization (4.608 Mbit), supporting simultaneous independent access from left and right ports. It operates at 3.3V core supply with selectable 3.3V/2.5V I/O voltage per port, features on-chip semaphore arbitration, JTAG IEEE 1149.1 compliance, and 12 ns max access time for commercial and industrial temperature ranges. It is used in real-time inter-processor communication systems requiring deterministic data exchange between two independent bus domains.
For engineers reviewing the 70V659S12BC datasheet, 70V659S12BC pinout, 70V659S12BC application, or 70V659S12BC equivalent, this page delivers verified technical context, validated pin functions, true dual-port timing behavior, semiconductor-grade power sequencing requirements, and precise alternative part selection guidance based on documented functional equivalence and package compatibility.
Technical Context
This device implements true dual-port SRAM architecture with fully asynchronous operation: each port has independent address, control, and bidirectional I/O buses (I/O0L–I/O35L and I/O0R–I/O35R), enabling concurrent read/write to the same memory location without external arbitration logic. The on-chip arbitration logic supports semaphore flag sharing via A0–A2 addressing and handles contention using BUSY flag signaling-either as output (Master, M/S = VIH) or input (Slave, M/S = VIL).
It supports flexible I/O voltage configuration per port via OPTL/OPTR pins, allowing mixed-voltage system interfacing (e.g., 3.3V left port + 2.5V right port). JTAG boundary-scan capability enables in-system testability, while separate byte-enable lines (BE0–BE3 per port) provide 9-bit granularity for partial-word writes aligned to LVTTL-compatible timing windows.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 128K × 36 bits (4.608 Mbit); supports depth expansion via cascaded MASTER/SLAVE configuration |
| Access Time (tAA) | 12 ns max (commercial & industrial grade); defines minimum address-to-data valid delay under full load |
| Core Supply Voltage | 3.3 V ± 150 mV; powers internal logic and memory array; all VDD pins must be connected to this rail |
| I/O Supply Voltage | Selectable 3.3 V ± 150 mV or 2.5 V ± 100 mV per port via OPTL/OPTR; determines VIH/VIL thresholds and drive strength |
| Operating Temperature | –40°C to +85°C (industrial grade); validated across full voltage and timing margins without derating |
| JTAG Compliance | IEEE 1149.1 standard; supports TDI/TDO/TCK/TMS/TRST for boundary-scan testing and debug visibility |
| Package Type | 208-pin Plastic Quad Flatpack (PQFP); 28 mm × 28 mm body, 0.5 mm lead pitch; RoHS-compliant green variant available |
Pinout & Package
70V659S12BC is packaged in a 208-pin PQFP (Plastic Quad Flatpack) with 28 mm × 28 mm footprint and 0.5 mm lead pitch. All VDD pins require connection to 3.3 V; VDDQL/VDDQR must match selected I/O voltage (3.3 V or 2.5 V) per port; all VSS pins connect to ground. NC pins include A16L, A16R (not used in 70V659), and several reserved locations per pin diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE0L / CE0R | Chip Enable 0 (Left/Right) | Primary enable for port access; CE0X = VIL and CE1X = VIH selects active chip enable mode |
| R/WL / R/WR | Read/Write Control (Left/Right) | Active-low write enable; drives I/O direction: high = read (output), low = write (input) |
| OEL / OER | Output Enable (Left/Right) | Controls output driver state; low enables data output, high places I/Os in high-impedance |
| A0L–A16L / A0R–A16R | Address Inputs (Left/Right) | 17-bit address bus per port; A16L/A16R are no-connect for 70V659 (128K = 17 address bits) |
| I/O0L–I/O35L / I/O0R–I/O35R | Bidirectional Data Bus (Left/Right) | 36-bit parallel I/O per port; supports byte-wise access via BE0–BE3 (9-bit bytes) |
| BE0L–BE3L / BE0R–BE3R | Byte Enable (Left/Right) | Four independent 9-bit byte masks; enables partial writes without disturbing other bytes in same word |
| SEML / SEMR | Semaphore Enable (Left/Right) | Activates semaphore register access (A0–A2) when CE = VIH and SEM = VIL; enables inter-port coordination |
| BUSYL / BUSYR | Busy Flag (Left/Right) | Open-drain totem-pole output (Master) or input (Slave); signals arbitration conflict during simultaneous access |
| M/S | Master/Slave Select | Configures BUSY behavior: VIH = BUSY output (Master), VIL = BUSY input (Slave); required for cascaded operation |
| OPTL / OPTR | I/O Voltage Option (Left/Right) | Selects I/O voltage level: VIH = 3.3 V operation (VDDQL/VDDQR = 3.3 V), VIL = 2.5 V operation (VDDQL/VDDQR = 2.5 V) |
| TDI / TDO / TCK / TMS / TRST | JTAG Test Interface | IEEE 1149.1 boundary-scan interface; enables production test, debug, and in-system verification |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write to identical memory addresses-eliminates need for external arbitration logic in real-time IPC designs |
| On-Chip Semaphore Logic | Eight shared semaphore flags accessible via A0–A2; allows atomic resource locking between processors without software overhead or race conditions |
| Independent I/O Voltage Selection | Each port supports 3.3 V or 2.5 V I/O levels via dedicated OPT pins-enables seamless integration into mixed-voltage SoC or FPGA subsystems |
| Asynchronous Port Operation | No clock required; timing governed solely by setup/hold and access parameters-ideal for legacy bus interfaces and deterministic latency-critical applications |
| Master/Slave Cascading Support | Multiple devices can be stacked to form >72-bit wide memory banks using M/S pin and BUSY flag chaining-no external glue logic needed |
| JTAG Boundary-Scan Compliance | Fully implements IEEE 1149.1 for structural test coverage, interconnect validation, and in-field diagnostics-reduces test development effort |
Applications
| Real-Time Inter-Processor Communication | Digital Signal Processing Buffering |
|---|---|
|
Use Scenario: Two DSPs or microcontrollers exchanging sensor fusion data in automotive ADAS domain with sub-microsecond latency constraints. IC Role / Device Role / Timing Role: Shared memory buffer with hardware-enforced mutual exclusion via semaphore flags and BUSY arbitration. Use Value: Eliminates software polling or OS-level mutexes; guarantees deterministic <12 ns inter-processor data handoff with zero CPU overhead. |
Use Scenario: High-throughput audio/video pipeline where one processor writes raw samples while another reads processed frames. IC Role / Device Role / Timing Role: Asynchronous dual-port SRAM acting as ping-pong buffer between encode/decode engines. Use Value: Enables continuous streaming without FIFO underflow/overflow; 36-bit width matches common DSP data paths (e.g., 32-bit + parity). |
| Industrial PLC Backplane Interface | Avionics Data Concentrator |
|
Use Scenario: Legacy 16-bit controller communicating with modern 32-bit motion control module over isolated backplane. IC Role / Device Role / Timing Role: Voltage-translating dual-port bridge with independent 2.5 V (FPGA) and 3.3 V (MCU) I/O rails. Use Value: Removes level-shifter ICs and timing skew; byte-enable masking allows legacy 16-bit writes to coexist with 32-bit transfers. |
Use Scenario: ARINC 429 or MIL-STD-1553 bus concentrator aggregating sensor inputs for flight control computer. IC Role / Device Role / Timing Role: Deterministic shared memory for time-triggered message buffering with JTAG-verifiable integrity. Use Value: Meets DO-254 DAL-A timing assurance requirements; BUSY flag ensures no data corruption during concurrent read/write cycles. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1365KV18 | 128K × 18-bit organization (2.304 Mbit); 167 MHz QDR-II+ interface; differential clock inputs; no built-in semaphore logic | Targeted at high-bandwidth packet buffering in networking ASICs-not suitable for asynchronous, arbitration-heavy IPC use cases | Select only if system requires DDR-style burst transfers and external arbitration is acceptable; not drop-in compatible due to width, interface, and feature mismatch |
| Renesas R1EX24064ASA0I#U0 | 64K × 16-bit EEPROM-based dual-port; 55 ns access; non-volatile storage; no JTAG; no byte-enable granularity | Used in firmware update staging or configuration retention-not for high-speed volatile data exchange | Choose only when persistent memory across power cycles is mandatory; incompatible for real-time IPC due to speed, width, and missing semaphore/BUSY features |
Compared with CY7C1365KV18 and R1EX24064ASA0I#U0, the 70V659S12BC uniquely delivers 36-bit asynchronous dual-port operation with integrated semaphore arbitration and mixed-voltage I/O-making it irreplaceable for deterministic, low-latency inter-processor communication where software-managed synchronization is unacceptable.
Availability
70V659S12BC is available at Aetrix Electronics and suitable for real-time inter-processor communication, industrial PLC backplane bridging, and avionics data concentrator applications requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for 70V659S12BC 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and high-performance interconnect solutions before its acquisition by Renesas Electronics in 2019. Its dual-port SRAM portfolio served demanding real-time embedded markets.
The 70V659S12BC belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic inter-processor communication in industrial automation, aerospace, and telecommunications infrastructure where hardware-enforced arbitration and mixed-voltage interoperability are critical.
FAQ
What is the maximum supported I/O voltage configuration for the 70V659S12BC?
The 70V659S12BC supports independent I/O voltage selection per port: OPTL and OPTR each configure their respective port for either 3.3 V (±150 mV) or 2.5 V (±100 mV) operation. This allows asymmetric configurations-for example, left port at 3.3 V and right port at 2.5 V-provided VDDQL and VDDQR are supplied accordingly. The core VDD remains fixed at 3.3 V.
Does the 70V659S12BC support true simultaneous read/write to the same memory address?
Yes, the 70V659S12BC implements true dual-port SRAM cells that allow concurrent read and write operations to the exact same memory location from left and right ports. The on-chip arbitration logic uses BUSY flag signaling (when M/S = VIH) to resolve contention, ensuring data integrity without external logic. This behavior is explicitly confirmed in the functional block diagram and truth tables of the official datasheet.
How is semaphore functionality implemented in the 70V659S12BC?
Semaphore functionality in the 70V659S12BC uses eight dedicated flags accessed via A0–A2 address lines on either port. To access semaphores, CE must be high and SEM low-distinct from normal RAM access (CE low, SEM high). The flags are shared between ports and support atomic read-modify-write via dedicated control sequences defined in Truth Table II. This eliminates software race conditions in multi-processor resource locking.
What package variants are available for the 70V659S12BC?
The 70V659S12BC is offered exclusively in the 208-pin Plastic Quad Flatpack (PQFP) package, as indicated by the "BC" suffix in the part number. While the broader 70V659/58/57 family includes 208-ball BGA and 256-ball BGA variants, the specific 70V659S12BC ordering code maps only to the PQFP option with industrial temperature range (–40°C to +85°C) and 12 ns access time.
Can the 70V659S12BC be used in a Master/Slave cascaded configuration?
Yes, the 70V659S12BC supports Master/Slave cascading via the M/S pin and BUSY flag chaining. When configured as Master (M/S = VIH), BUSY is an output that can drive the BUSY input of a Slave device (M/S = VIL). This enables depth expansion beyond 128K words and forms wider memory banks (e.g., 72-bit+) without external logic-explicitly documented in the device description and pin function table.
70V659S12BC Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 256-LBGA
- Packaging:
- Tray
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 4.5Mbit
- Memory Organization:
- 128K x 36
- 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:
- 256-CABGA (17x17)
70V659S12BC FAQ
1.How can I place an order for 70V659S12BC through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V659S12BC 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 70V659S12BC reliable?
The price and inventory of 70V659S12BC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V659S12BC is usually 5 days.
3.What payment methods are accepted for 70V659S12BC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V659S12BC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V659S12BC?
70V659S12BC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V659S12BC 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 70V659S12BC?
For technical support, including 70V659S12BC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V659S12BC requirements.
6.How does Aetrix verify that 70V659S12BC is sourced from the original manufacturer or authorized distributors?
All 70V659S12BC 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 70V659S12BC meets industry standards.
7.What is the process for return or replacement of 70V659S12BC?
All 70V659S12BC units undergo pre-shipment inspection (PSI). If there is an issue with 70V659S12BC, 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 70V659S12BC part is unused and in its original packaging.
Return procedure for 70V659S12BC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V659S12BC 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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