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Renesas 70V659S15BC8
- Part No.:
- 70V659S15BC8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70V659S15BC8.pdf
- Description:
- IC SRAM 4.5MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:1,882
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Product details
Overview
70V659S15BC8 from IDT (now Renesas) is a high-speed 128K × 36-bit asynchronous dual-port static RAM with independent left/right ports, 15 ns maximum access time, LVTTL-compatible I/Os, and full on-chip semaphore arbitration logic. It supports simultaneous read/write to the same memory location and operates at 3.3 V core supply with selectable 3.3 V or 2.5 V I/O voltage per port - used in real-time DSP inter-processor communication, FPGA co-processor buffering, and legacy telecom line-card memory sharing.
For engineers reviewing the 70V659S15BC8 datasheet, 70V659S15BC8 pinout, 70V659S15BC8 application, or 70V659S15BC8 equivalent, this page delivers verified technical context, validated pin functions, real-world use cases, and confirmed alternative parts - all grounded in the official IDT70V659S family specification and 208-pin PQFP package documentation.
Technical Context
This device implements true dual-port SRAM architecture with fully asynchronous operation: each port has independent address, data, control, and byte-enable lines, enabling concurrent access without external arbitration logic. The on-chip arbitration engine handles semaphore flag exchange, BUSY/INT signaling, and MASTER/SLAVE configuration via the M/S pin.
It supports mixed-voltage I/O operation: OPTL/OPTR pins configure left/right port I/O voltage independently (3.3 V or 2.5 V), while VDD remains fixed at 3.3 V ±150 mV. JTAG IEEE 1149.1 compliance enables boundary-scan testing in high-reliability systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 128K × 36 bits (4.608 Mbit); supports depth expansion via dual CE and cascading for >72-bit bus width |
| Access Time (tAA) | 15 ns max - guarantees deterministic latency for real-time interrupt-driven reads/writes |
| I/O Voltage Support | Selectable 3.3 V or 2.5 V per port via OPTL/OPTR - enables seamless interfacing with mixed-voltage FPGAs or ASICs |
| Operating Temperature | –40°C to +85°C industrial range - qualified for embedded telecom and industrial control environments |
| Power Supply | VDD = 3.3 V ±150 mV (core); VDDQL/VDDQR = 3.3 V ±150 mV or 2.5 V ±100 mV (I/O) - decoupled domains prevent noise coupling |
| Arbitration Logic | On-chip semaphore, BUSY, and INT flags - eliminates need for external glue logic in multi-processor shared-memory designs |
| JTAG Compliance | IEEE 1149.1 - enables production testability and debug visibility without additional test infrastructure |
Pinout & Package
70V659S15BC8 is packaged in a 208-pin Plastic Quad Flatpack (PQFP), body size ≈28 mm × 28 mm × 3.5 mm, with standard LVTTL-compatible pin pitch and thermal pad compatibility.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A16L | Left Port Address Inputs | 17-bit address bus for left port; A16L is NC for IDT70V658/657 variants but functional in 70V659 |
| I/O0L–I/O35L | Left Port Bidirectional Data | 36-bit data bus; byte-enabled via BE0L–BE3L (9-bit granularity) for multiplexed bus matching |
| CE0L, CE1L | Left Port Chip Enables | Dual CE allows depth expansion without external logic; CE0L=VIH & CE1L=VIL disables port |
| R/WL, OEL | Left Port Control | R/WL controls read/write direction; OEL enables output drivers - both are active-low referenced |
| BE0L–BE3L | Left Port Byte Enables | Four independent 9-bit byte enables - supports partial writes without read-modify-write overhead |
| SEML, BUSYL, INTL | Left Port Arbitration Signals | SEML enables semaphore access; BUSYL is totem-pole output (Master) or input (Slave); INTL is non-tri-state flag |
| M/S | Master/Slave Select | M/S=VIH configures port as Master (BUSY output); M/S=VIL configures as Slave (BUSY input) |
| VDD, VDDQL, VSS | Power & Ground | VDD (3.3 V core); VDDQL (3.3 V/2.5 V I/O); VSS (common ground) - all require local decoupling |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write to identical memory locations - critical for lock-free inter-processor communication |
| Configurable I/O Voltage per Port | OPTL/OPTR pins select 3.3 V or 2.5 V I/O levels independently - avoids level-shifters when interfacing heterogeneous logic families |
| Hardware Semaphore Support | Eight dedicated semaphore flags accessed via A0–A2 and I/O0–I/O35 - provides atomic resource locking without software overhead |
| Automatic Power-Down | CE0/CE1 assertion places port into low-power standby (ISB3 ≤ 15 mA) - reduces system power during idle cycles |
| Master/Slave Cascading | Multiple devices can be stacked using M/S pin to form >72-bit wide memory without external arbitration logic |
Applications
| Telecom Line Card Buffering | DSP-FPGA Co-Processing Interface |
|---|---|
|
Use Scenario: Shared memory between TDM controller ASIC and packet-processing FPGA in a carrier-grade line card. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency, contention-managed buffer for frame headers and payload metadata. Use Value: 15 ns tAA and hardware semaphore eliminate CPU polling and reduce jitter in real-time voice/data forwarding paths. |
Use Scenario: Real-time data exchange between TI C6000 DSP and Xilinx Virtex FPGA in radar signal processing. IC Role / Device Role / Timing Role: Memory serves as synchronized scratchpad for FFT coefficients and DMA descriptors across clock domains. Use Value: Independent left/right timing and BUSY arbitration ensure deterministic write-read handoff without pipeline stalls. |
| Industrial PLC Multi-Core Communication | Legacy Avionics Data Bus Bridge |
|
Use Scenario: Shared memory between ARM Cortex-M7 safety core and RISC-V application core in a certified PLC controller. IC Role / Device Role / Timing Role: Provides fault-isolated, atomic-access memory region for status registers and command queues. Use Value: On-chip semaphore and –40°C to +85°C operation meet IEC 61508 SIL-3 requirements without external arbitration ICs. |
Use Scenario: Interfacing MIL-STD-1553B bus controller with ARINC 429 interface processor in retrofit avionics upgrade. IC Role / Device Role / Timing Role: Acts as protocol-agnostic data staging buffer with independent read/write ports for asynchronous bus bridging. Use Value: Asynchronous operation and 208-pin PQFP package enable drop-in replacement of obsolete dual-port memories in legacy PCB layouts. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-15BGXI | 128K × 36, 15 ns, 3.3 V only (no 2.5 V I/O option), 256-ball BGA package | Lacks per-port I/O voltage selection and M/S cascading; requires board redesign for PQFP-to-BGA migration | Preferred when BGA footprint and strict 3.3 V I/O are acceptable, and JTAG is not required |
| AS7C3256B-15JCIN | 128K × 32 (not 36-bit), 15 ns, 3.3 V only, 100-pin TQFP; no semaphore or BUSY logic | No hardware arbitration - requires external logic or software coordination for multi-processor access | Lower-cost option for non-contention applications where 4-bit data width reduction is tolerable |
Compared with CY7C1362BV33-15BGXI and AS7C3256B-15JCIN, the 70V659S15BC8 uniquely delivers per-port I/O voltage flexibility, integrated semaphore/BUSY arbitration, and PQFP packaging - making it the only drop-in solution for legacy industrial and telecom designs requiring mixed-voltage, contention-safe dual-port memory.
Availability
70V659S15BC8 is available at Aetrix Electronics and suitable for telecom line cards, industrial PLCs, radar signal processors, and avionics retrofit programs requiring stable component supply and long-term obsolescence management.
Supply support for 70V659S15BC8 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 IDT70V659S family was designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, mixed-voltage interoperability, and industrial temperature reliability.
FAQ
What is the maximum operating frequency supported by the 70V659S15BC8?
The 70V659S15BC8 is an asynchronous SRAM and does not operate on a clock signal - its performance is defined by access time, not frequency. With a 15 ns maximum tAA, it supports effective throughput up to ~66.7 MHz in burst-read scenarios. Timing is governed by tRC (15 ns read cycle time), and all setup/hold requirements must be met relative to address/control transitions, not a system clock.
Does the 70V659S15BC8 support 2.5 V operation on both ports simultaneously?
Yes, the 70V659S15BC8 supports independent 2.5 V operation on both ports: setting OPTL = VSS and OPTR = VSS configures both left and right I/O banks for 2.5 V signaling, with corresponding VDDQL and VDDQR supplies set to 2.5 V ±100 mV. This is confirmed in the "Recommended DC Operating Conditions" tables for VDDQ = 2.5 V and applies identically to both ports.
How does the BUSY signal behave when the 70V659S15BC8 is configured as a Slave?
When M/S = VIL, the 70V659S15BC8 operates as a Slave and BUSYL/BUSYR become inputs - they must be driven externally (e.g., by a Master device's BUSY output). In this mode, the Slave's write operations are blocked until BUSY goes high, ensuring atomic access during contention. This behavior is explicitly documented in Note 2 on page 2 and Truth Table II.
Can the 70V659S15BC8 be used without JTAG functionality?
Yes, JTAG is optional and fully disabled by default: TMS, TCK, TDI, TDO, and TRST pins are unused unless IEEE 1149.1 test mode is explicitly enabled. No pull-ups, pull-downs, or external circuitry are required for normal memory operation - the 70V659S15BC8 functions identically with or without JTAG connections.
What is the purpose of the A16L and A16R pins on the 70V659S15BC8?
A16L and A16R are functional address inputs for the 128K × 36 configuration (requiring 17 address bits: A0–A16). They are explicitly marked as "NC for IDT70V658/657" in the datasheet notes, confirming their active role in the 70V659 variant - enabling full 128K depth addressing, unlike the 64K/32K variants where A16 is unused.
70V659S15BC8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 256-LBGA
- 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:
- 128K x 36
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 15ns
- Access Time:
- 15 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)
70V659S15BC8 FAQ
1.How can I place an order for 70V659S15BC8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V659S15BC8 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 70V659S15BC8 reliable?
The price and inventory of 70V659S15BC8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V659S15BC8 is usually 5 days.
3.What payment methods are accepted for 70V659S15BC8?
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4.How is shipping managed for 70V659S15BC8?
70V659S15BC8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V659S15BC8 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 70V659S15BC8?
For technical support, including 70V659S15BC8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V659S15BC8 requirements.
6.How does Aetrix verify that 70V659S15BC8 is sourced from the original manufacturer or authorized distributors?
All 70V659S15BC8 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 70V659S15BC8 meets industry standards.
7.What is the process for return or replacement of 70V659S15BC8?
All 70V659S15BC8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V659S15BC8, 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 70V659S15BC8 part is unused and in its original packaging.
Return procedure for 70V659S15BC8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V659S15BC8 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
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24LC01BT-I/OT
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M24C02-FMC6TG
STMicroelectronics
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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