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Renesas 7007L35J8
- Part No.:
- 7007L35J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7007L35J8.pdf
- Description:
- IC SRAM 256KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,083
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Product details
Overview
IDT7007L35J8 from IDT (Integrated Device Technology) is a high-speed 32K × 8 dual-port static RAM with true independent left/right ports, 35 ns read cycle time, industrial temperature range (–40°C to +85°C), and 5 V ±10% single-supply operation. It enables simultaneous asynchronous access to shared memory in real-time interprocessor communication systems, such as dual-CPU industrial controllers or redundant PLC modules.
For engineers reviewing the IDT7007L35J8 datasheet, IDT7007L35J8 pinout, IDT7007L35J8 application, or IDT7007L35J8 equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 35 ns), semaphore flag support (8 flags via A0–A2), interrupt mailbox addressing (7FFE/7FFF), and compatibility with 68-pin PLCC footprint for legacy board reuse.
Technical Context
The IDT7007L35J8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port - no clock required. Its on-chip arbitration logic resolves contention via BUSY flag assertion (push-pull output) when address matches occur across ports, with priority determined by tAPS (5 ns setup) and M/S pin configuration.
It supports two distinct memory access modes: standard RAM access (CE = VIL, SEM = VIH) and semaphore register access (CE = VIH, SEM = VIL), using the same I/O pins but different address decoding (A0–A2 for semaphores). Interrupts are edge-triggered via dedicated INTL/INTR outputs tied to fixed mailboxes at 7FFEH (left) and 7FFFH (right).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 32K × 8 bits (256 Kbit total); supports independent 8-bit reads/writes on left and right ports simultaneously |
| Access Time (tAA) | 35 ns max - defines minimum address hold before valid data appears; critical for 28.6 MHz bus timing |
| Read Cycle Time (tRC) | 35 ns max - sets minimum interval between successive read operations on same port |
| Operating Voltage | 4.5 V to 5.5 V - TTL-compatible; allows direct interface with 5 V microcontrollers without level shifters |
| Temperature Range | –40°C to +85°C - qualified for industrial environments including factory automation and motor drives |
| Standby Current (ISB3) | 0.2 mA typ. - ultra-low power full standby mode when both CE pins > VCC − 0.2 V and all inputs CMOS-level |
| Bus Interface | Two independent 8-bit bidirectional I/O ports (I/O0L–I/O7L and I/O0R–I/O7R) with tri-state control per port |
Pinout & Package
Package: 68-pin Plastic Leaded Chip Carrier (PLCC), body size ≈ 24.1 mm × 24.1 mm × 4.3 mm, lead pitch 1.27 mm. RoHS-compliant, green part variant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A14L | Left port address inputs | 15-bit address bus for 32K locations; must be stable before CEL active for valid access |
| A0R–A14R | Right port address inputs | Independent 15-bit address bus; enables concurrent access to same or different memory locations |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; direction controlled by R/WL; high-impedance when OEL = H or CEL = H |
| I/O0R–I/O7R | Right port bidirectional data | 8-bit data path; electrically isolated from left port; no contention risk during simultaneous use |
| CEL / CER | Chip enable (active low) | Port-select enable; deassertion forces respective port into low-power standby (ISB1/ISB2/ISB3 modes) |
| R/WL / R/WR | Read/write control (active low) | Controls data direction on I/O bus; LOW = write, HIGH = read (when OE active) |
| OEL / OER | Output enable (active low) | Enables output drivers; required HIGH for writes, LOW for reads (with CE active) |
| SEML / SEMR | Semaphore enable (active low) | Switches port to semaphore register mode (A0–A2 select one of eight flags; I/O0 writes, all I/O read) |
| INTL / INTR | Interrupt flag outputs | Open-drain compatible push-pull outputs; asserted when opposite port writes to 7FFEH/7FFFH |
| BUSYL / BUSYR | Busy flag I/O | Push-pull; output when M/S = H (master), input when M/S = L (slave); blocks writes during address contention |
| M/S | Master/slave select | H = BUSY outputs enabled (arbitration master); L = BUSY inputs accepted (arbitration slave) |
| VCC / GND | Power supply | Four VCC and six GND pins distributed for low-noise operation; all must be connected per datasheet note |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous read–read, read–write, or write–write to same location without corruption or wait states |
| On-chip semaphore logic | Eight hardware semaphore registers accessible via A0–A2; eliminates need for external locking logic in multi-processor sync |
| Hardware interrupt mailboxes | Dedicated 8-bit SRAM locations (7FFEH, 7FFFH) trigger INTL/INTR flags - no software polling required |
| Configurable arbitration mode | M/S pin selects master (BUSY output) or slave (BUSY input); supports cascaded MASTER/SLAVE configurations for 16-bit+ data paths |
| Low-power standby modes | Three distinct standby currents (ISB1–ISB4) down to 0.2 mA typ., enabling dynamic power gating per port |
Applications
| Industrial Dual-CPU Controllers | Redundant PLC Memory Modules |
|---|---|
Use Scenario: Two independent CPUs share status, command, and diagnostic data in real time within a programmable logic controller chassis. IC Role / Device Role / Timing Role: IDT7007L35J8 serves as shared memory buffer with hardware arbitration, eliminating software locks and reducing inter-CPU latency to ≤35 ns. Use Value: Enables deterministic response under worst-case contention; BUSY flag prevents write collisions without CPU intervention. |
Use Scenario: Primary and backup PLC processors maintain synchronized state via mirrored memory, requiring atomic updates and fault detection. IC Role / Device Role / Timing Role: IDT7007L35J8 provides dual-access SRAM with semaphore flags for safe handover and interrupt-driven failover signaling. Use Value: Prevents split-brain conditions; INTL/INTR flags trigger immediate switchover without polling overhead. |
| Real-Time Interprocessor Communication | Legacy Avionics Data Buffers |
Use Scenario: DSP and microcontroller exchange sensor fusion results and control commands in aerospace flight control units. IC Role / Device Role / Timing Role: IDT7007L35J8 acts as zero-latency memory bridge with independent 8-bit I/O ports, supporting asymmetric processing loads. Use Value: Eliminates FIFO bottlenecks; 35 ns access ensures sub-microsecond data transfer between heterogeneous cores. |
Use Scenario: Retrofitting modern processors into MIL-STD-1553B or ARINC 429 avionics systems requiring backward-compatible memory interfaces. IC Role / Device Role / Timing Role: IDT7007L35J8 replaces obsolete dual-port RAMs in 68-pin PLCC sockets while maintaining identical timing and pinout. Use Value: Drop-in replacement with extended temperature support (–40°C to +85°C) and improved reliability over legacy parts. |
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 CY7C024AV-35JC | 32K × 8, 35 ns, 3.3 V core (5 V tolerant I/O), 80-pin TQFP only - no PLCC option | Requires level-shifting for pure 5 V systems; lacks native 68-pin PLCC footprint for drop-in replacement | Choose for new 3.3 V designs with space-constrained layouts; avoid for legacy PLCC board upgrades. |
| Renesas R1EX24032AS0C-35 | 32K × 8, 35 ns, industrial temp, 68-pin PLCC, but no semaphore or interrupt logic - discrete arbitration required | Needs external logic for BUSY/interrupt handling; increases BOM count and PCB area vs. IDT7007L35J8's integrated features | Acceptable only if semaphore/interrupt functions are unused; otherwise adds design complexity and validation effort. |
Compared with CY7C024AV-35JC and R1EX24032AS0C-35, the IDT7007L35J8 uniquely delivers full hardware arbitration, semaphore registers, and interrupt mailboxes in a 68-pin PLCC package - enabling simpler, more reliable dual-processor synchronization without external components or voltage translation.
Availability
IDT7007L35J8 is available at Aetrix Electronics and suitable for industrial automation, redundant control systems, and real-time interprocessor communication requiring stable component supply, long-term lifecycle support, and verified PLCC packaging.
Supply support for IDT7007L35J8 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, and RF solutions, acquired by Renesas Electronics in 2019. Known for high-performance, low-jitter timing and dual-port memory products.
The IDT7007 family was designed specifically for deterministic, contention-free memory sharing between independent processors in industrial, military, and telecom infrastructure - emphasizing hardware arbitration, interrupt signaling, and seamless master/slave scalability.
FAQ
What is the maximum operating frequency supported by the IDT7007L35J8?
The IDT7007L35J8 does not operate on a clock; it is fully asynchronous. Its 35 ns read cycle time (tRC) supports effective bus rates up to 28.6 MHz when interfaced with microcontrollers or FPGAs using proper address/control timing. Maximum sustained throughput depends on system-level timing margins, not an internal oscillator.
Does the IDT7007L35J8 require external pull-up resistors on BUSY or INT pins?
No. The IDT7007L35J8 features push-pull outputs on BUSYL, BUSYR, INTL, and INTR - confirmed in datasheet Note 2 of Functional Block Diagram and Truth Table II. External pull-ups are unnecessary and may cause contention or excessive current draw.
Can the IDT7007L35J8 be used in a single-port configuration?
Yes. Either port (left or right) can be used independently by tying its CE pin high and disabling its control signals. The unused port enters standby mode (ISB1), drawing ≤60 mA typical. Full dual-port functionality remains available if needed later.
How is semaphore access implemented on the IDT7007L35J8?
Semaphore access requires CE = VIH and SEM = VIL. Address bits A0–A2 select one of eight semaphore flags; I/O0 writes the flag value, and all I/O lines (I/O0–I/O7) read it back. This mode isolates semaphore registers from main memory, preventing accidental overwrites.
Is the IDT7007L35J8 pin-compatible with earlier IDT7007 variants like the IDT7007L25J8?
Yes. All IDT7007L-xJ8 variants (x = 15, 20, 25, 35, 55) share identical 68-pin PLCC pinout, electrical interface, and functional block diagram. Only AC timing parameters differ - allowing direct replacement in existing designs where 35 ns timing meets system requirements.
7007L35J8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 256Kbit
- Memory Organization:
- 32K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
7007L35J8 FAQ
1.How can I place an order for 7007L35J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7007L35J8 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 7007L35J8 reliable?
The price and inventory of 7007L35J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7007L35J8 is usually 5 days.
3.What payment methods are accepted for 7007L35J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7007L35J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7007L35J8?
7007L35J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7007L35J8 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 7007L35J8?
For technical support, including 7007L35J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7007L35J8 requirements.
6.How does Aetrix verify that 7007L35J8 is sourced from the original manufacturer or authorized distributors?
All 7007L35J8 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 7007L35J8 meets industry standards.
7.What is the process for return or replacement of 7007L35J8?
All 7007L35J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7007L35J8, 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 7007L35J8 part is unused and in its original packaging.
Return procedure for 7007L35J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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