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Renesas 70T659S10BCI8
- Part No.:
- 70T659S10BCI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 256-LBGA
- Datasheet:
-
70T659S10BCI8.pdf
- Description:
- IC SRAM 4.5MBIT PAR 256CABGA
- Quantity:
- Payment:
- Shipping:
Inventory:2,760
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Product details
Overview
70T659S10BCI8 from Integrated Device Technology is a high-speed 256K × 36-bit asynchronous dual-port static RAM with true independent left/right ports, 10 ns access time (commercial grade), 2.5 V core supply, and selectable 2.5 V/3.3 V I/O interface per port. It supports simultaneous read/write to the same memory location and is used in real-time inter-processor communication, FPGA co-processor buffering, and telecom packet switching systems.
For engineers reviewing the 70T659S10BCI8 datasheet, 70T659S10BCI8 pinout, 70T659S10BCI8 application, or 70T659S10BCI8 equivalent, key selection criteria include dual-port arbitration logic, RapidWrite mode timing compliance, M/S master/slave cascading capability, and industrial-grade thermal stability up to +85°C.
Technical Context
This device implements fully asynchronous dual-port architecture with on-chip semaphore signaling and port arbitration logic, enabling conflict-free concurrent access without external handshaking. Each port features independent CE0/CE1 enables, R/W control, byte enables (BE0–BE3), and dedicated interrupt/busy flags.
The 70T659S10BCI8 supports flexible voltage configuration: fixed 2.5 V core (VDD) and independently configurable I/O supplies (VDDQL/VDDQR) set via OPTL/OPTR pins to either 2.5 V or 3.3 V - allowing mixed-voltage system integration. JTAG IEEE 1149.1 support enables boundary-scan testing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 256K × 36 bits (9,216 Kbit total); A17 is NC - 18 address lines not used |
| Access Time (tAA) | 10 ns max (commercial grade); enables 100 MHz back-to-back operation in RapidWrite mode |
| Core Supply Voltage | 2.5 V ±100 mV; fixed low-power core independent of I/O voltage selection |
| I/O Interface Voltage | Selectable 2.5 V or 3.3 V per port via OPTL/OPTR; VDDQL/VDDQR must match selected level |
| Operating Temperature | –40°C to +85°C (industrial grade); validated for continuous operation across full range |
| Package | 256-ball BGA (BC256); 17 mm × 17 mm × 1.4 mm body, 1.0 mm ball pitch |
| Power Consumption | ISB3 = 2–10 mA (full standby, CMOS inputs); IDD = 300–445 mA (both ports active, fMAX) |
Pinout & Package
70T659S10BCI8 is housed in a 256-ball fine-pitch BGA (BC256 package). All VDD pins require 2.5 V; VDDQL/VDDQR must be set to 2.5 V or 3.3 V per port based on OPTL/OPTR state; all VSS pins connect to ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A16L | Left port address inputs | 17-bit address bus for left port; A17L is NC per datasheet Note 1 |
| A0R–A16R | Right port address inputs | 17-bit address bus for right port; A17R is NC per datasheet Note 1 |
| I/O0L–I/O35L | Left port bidirectional data | 36-bit parallel data path; BE0L–BE3L enable 9-bit byte writes |
| I/O0R–I/O35R | Right port bidirectional data | 36-bit parallel data path; BE0R–BE3R enable 9-bit byte writes |
| CE0L, CE1L, CE0R, CE1R | Chip enable pairs | Dual CE per port allows depth expansion without external logic |
| R/WL, R/WR | Read/write direction control | Active-low write enable; supports RapidWrite mode when held low across address transitions |
| OEL, OER | Output enable | Tri-states I/Os independently per port; required for bus sharing |
| BE0L–BE3L, BE0R–BE3R | Byte enable inputs | Four 9-bit byte controls allow granular 1–36-bit writes per cycle |
| SEML, SEMR | Semaphore enable | Enables 8-bit semaphore register access (A0–A2) for inter-port synchronization |
| BUSYL, BUSYR | Busy flag | Push-pull output (non-tri-state); M/S = VIH → output (Master), M/S = VIL → input (Slave) |
| INTL, INTR | Interrupt flag | Push-pull output (non-tri-state); asserts on semaphore event or error condition |
| M/S | Master/Slave select | Configures BUSY/INT direction; enables cascading >72-bit systems using IDT's Master/Slave approach |
| OPTL, OPTR | I/O voltage option | VDD = 2.5 V → 3.3 V I/O; VSS = 0 V → 2.5 V I/O; independent per port |
| ZZL, ZZR | Sleep mode enable | Asserted high disables dynamic inputs (except JTAG); reduces ISB to ≤10 mA |
| TCK, TMS, TDI, TDO, TRST | JTAG boundary scan | Fully compliant IEEE 1149.1; operates at ≤10 MHz; isolated during sleep mode |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous, independent read/write to identical addresses - eliminates arbitration latency in real-time systems |
| RapidWrite Mode | Back-to-back writes without pulsing R/W/CE/BEn; address transition defines cycle end - simplifies high-speed controller design |
| On-chip semaphore logic | Eight hardware semaphore flags accessible via A0–A2; enables deterministic inter-processor synchronization without software overhead |
| Independent I/O voltage control | OPTL/OPTR pins configure each port for 2.5 V or 3.3 V operation - supports mixed-voltage SoC/FPGA interfaces |
| Full port arbitration logic | Hardware-resolved contention on shared memory locations; no external logic required for safe multi-master access |
| Industrial temperature support | Validated –40°C to +85°C operation with guaranteed 10 ns access time - suitable for base station, avionics, and industrial PLCs |
Applications
| Telecom Packet Buffering | FPGA-CPU Co-Processor Interface |
|---|---|
Use Scenario: High-throughput line cards buffering variable-length Ethernet/IP packets between ingress and egress ASICs. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency, non-blocking FIFO buffer - left port accepts packet data from PHY, right port feeds switch fabric. Use Value: 10 ns tAA and RapidWrite mode sustain 100+ Mpacket/s throughput; semaphore flags coordinate packet ownership without CPU intervention. |
Use Scenario: Real-time data exchange between Xilinx Kintex FPGA and ARM Cortex-A9 processor in radar signal processing. IC Role / Device Role / Timing Role: Shared memory resource enabling lock-step DMA transfers - FPGA writes processed samples, CPU reads for display/logic. Use Value: Independent 2.5 V/3.3 V I/O per port matches FPGA bank voltage and CPU bus levels; M/S cascading extends to 72-bit word width. |
| Industrial PLC Memory Expansion | Avionics Display System Frame Buffer |
Use Scenario: Deterministic I/O mapping and ladder logic execution in safety-critical programmable logic controllers. IC Role / Device Role / Timing Role: Dual-port RAM stores real-time I/O image - one port updated by fieldbus controller, second port scanned by CPU. Use Value: –40°C to +85°C rating ensures reliability in uncontrolled cabinet environments; BUSY/INT flags guarantee atomic read-modify-write cycles. |
Use Scenario: Graphics frame buffer for HUD (Head-Up Display) rendering in commercial aircraft cockpit systems. IC Role / Device Role / Timing Role: Left port receives pixel data from GPU at 60 Hz, right port streams to LVDS serializer - synchronized via semaphore handshake. Use Value: JTAG testability meets DO-254 requirements; low ISB3 current (<10 mA) minimizes thermal load in sealed display enclosures. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-10BGXI | 3.3 V core (not 2.5 V); 16-bit × 2 banks; no RapidWrite mode; 10 ns tAA same | Requires level-shifting for 2.5 V core systems; lacks semaphore logic and M/S cascading | Choose only if 3.3 V core supply is available and semaphore-free designs are acceptable |
| AS7C33256P-10TIN | Single-port only; 32K × 36 organization; 3.3 V I/O only; no JTAG or sleep mode | Cannot support concurrent access; requires external arbitration logic for multi-processor use | Use only in cost-sensitive, non-real-time applications where dual-port functionality is unnecessary |
Compared with CY7C1362BV33-10BGXI and AS7C33256P-10TIN, the 70T659S10BCI8 uniquely delivers 2.5 V core efficiency, hardware semaphore support, and RapidWrite timing - making it the only option for deterministic, low-latency inter-processor memory sharing in industrial and aerospace systems.
Availability
70T659S10BCI8 is available at Aetrix Electronics and suitable for telecom packet buffering, FPGA-CPU co-processor interfacing, and industrial PLC memory expansion requiring stable component supply across extended product lifecycles.
Supply support for 70T659S10BCI8 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, is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.
The 70T659S10BCI8 belongs to IDT's high-speed asynchronous dual-port SRAM product line, designed specifically for deterministic, low-latency inter-processor communication in real-time embedded systems where concurrent access and hardware synchronization are critical.
FAQ
What is the function of the M/S pin on the 70T659S10BCI8?
The M/S (Master/Slave) pin configures the directionality of the BUSY and INT signals. When M/S = VIH, BUSYL/BUSYR and INTL/INTR operate as push-pull outputs (Master mode); when M/S = VIL, they become inputs (Slave mode). This enables daisy-chained configurations where one 70T659S10BCI8 acts as master coordinating multiple slave devices in wide-memory systems.
Does the 70T659S10BCI8 support both 2.5 V and 3.3 V I/O voltages simultaneously?
Yes - the 70T659S10BCI8 supports independent I/O voltage selection per port. OPTL sets left-port I/O voltage (2.5 V or 3.3 V), and OPTR sets right-port I/O voltage. VDDQL and VDDQR must be supplied at the corresponding level. The core VDD remains fixed at 2.5 V ±100 mV regardless of I/O configuration.
How does RapidWrite Mode work on the 70T659S10BCI8?
RapidWrite Mode allows consecutive write operations without toggling R/W, CE, or BE signals. The write cycle ends on the *next* address transition, not on R/W deassertion. This eliminates narrow pulse generation challenges and sustains 100 MHz throughput. tDW and tDH are referenced to the ending address edge, and tAS/tWR apply only when switching between read and write modes.
Is A17 used as an address line on the 70T659S10BCI8?
No - A17L and A17R are No Connect (NC) pins on the 70T659S10BCI8, as explicitly stated in datasheet Notes 1 and 4. The device implements 256K × 36 organization using only A0–A16 (17 address lines), resulting in 131,072 words. This distinguishes it from the 128K × 36 variant (70T651) which uses A0–A16 but maps differently.
What is the purpose of the semaphore feature in the 70T659S10BCI8?
Each port of the 70T659S10BCI8 includes eight hardware semaphore flags accessible via A0–A2. These flags provide atomic, lock-free inter-port synchronization - for example, signaling "data ready" or "buffer free" without CPU polling. Semaphore access requires CE = VIH and SEM = VIL, and is fully supported in both commercial and industrial temperature grades.
70T659S10BCI8 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:
- 10ns
- Access Time:
- 10 ns
- Voltage - Supply:
- 2.4V ~ 2.6V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 256-CABGA (17x17)
70T659S10BCI8 FAQ
1.How can I place an order for 70T659S10BCI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70T659S10BCI8 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 70T659S10BCI8 reliable?
The price and inventory of 70T659S10BCI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70T659S10BCI8 is usually 5 days.
3.What payment methods are accepted for 70T659S10BCI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70T659S10BCI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70T659S10BCI8?
70T659S10BCI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70T659S10BCI8 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 70T659S10BCI8?
For technical support, including 70T659S10BCI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70T659S10BCI8 requirements.
6.How does Aetrix verify that 70T659S10BCI8 is sourced from the original manufacturer or authorized distributors?
All 70T659S10BCI8 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 70T659S10BCI8 meets industry standards.
7.What is the process for return or replacement of 70T659S10BCI8?
All 70T659S10BCI8 units undergo pre-shipment inspection (PSI). If there is an issue with 70T659S10BCI8, 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 70T659S10BCI8 part is unused and in its original packaging.
Return procedure for 70T659S10BCI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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