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Renesas 7005L55JI
- Part No.:
- 7005L55JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7005L55JI.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:3,280
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Product details
Overview
IDT7005L55JI from Integrated Device Technology (IDT) is a high-speed 8K × 8 dual-port static RAM with true independent left/right ports, 55 ns maximum read cycle time, 2V data retention capability, and industrial temperature range (–40°C to +85°C). It enables simultaneous asynchronous access to shared memory in real-time inter-processor communication, motion control systems, and digital signal processing buffers.
For engineers reviewing the IDT7005L55JI datasheet, IDT7005L55JI pinout, IDT7005L55JI application, or IDT7005L55JI equivalent, key selection criteria include BUSY arbitration timing (tBDD ≤ 35 ns), semaphore flag support (8 flags via A0–A2), low standby current (1 µA typical), and 64-pin TQFP package compatibility with board-level space constraints.
Technical Context
The IDT7005L55JI implements fully asynchronous dual-port architecture with separate address, data, and control buses for left (L) and right (R) ports. It supports hardware-based port arbitration via push-pull BUSY outputs (M/S = H) or BUSY inputs (M/S = L), and includes on-chip semaphore logic for inter-port synchronization using I/O0–I/O7 and address bits A0–A2.
It operates at 5.0 V ±10% with TTL-compatible signaling and integrates automatic power-down via CE-controlled standby modes. The device uses CMOS technology to achieve 700 mW active power (typ.) and 1 mW standby power (typ.), enabling battery backup operation down to 2 V with data retention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 (64 Kbit), two independent addressable spaces |
| Max Read Cycle Time (tRC) | 55 ns - defines minimum interval between successive reads on same port |
| Standby Current (ISB3) | 1 µA typical - enables ultra-low-power battery-backed retention mode | Data Retention Voltage | 2.0 V - guarantees non-volatile data hold without main VCC |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments |
| Supply Voltage | 4.5 V to 5.5 V - single 5 V ±10% rail, no auxiliary supplies required |
| Package | 64-pin thin quad flatpack (TQFP), 14 mm × 14 mm × 1.4 mm |
Pinout & Package
64-pin TQFP (PNG64) package with 0.5 mm pitch; body dimensions 14 mm × 14 mm × 1.4 mm. All VCC pins require local decoupling; all GND pins must be connected to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L | Left port address inputs | 13-bit address bus for left-side memory access (8K = 2¹³) |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit parallel data path; tri-stated when OEL = H or CEL = H |
| CEL, OEL, R/WL | Left port controls | Chip Enable, Output Enable, Read/Write select - fully asynchronous |
| A0R–A12R | Right port address inputs | Independent 13-bit address space; not mirrored or shared with left port |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated data path; no contention unless same address accessed simultaneously |
| CER, OER, R/WR | Right port controls | Functionally identical to left controls but with independent timing domains |
| SEML, SEMR | Semaphore enable | Activates 8-flag semaphore register (addressed by A0–A2) for inter-port coordination |
| BUSYL, BUSYR | Arbitration flags | Push-pull outputs (master) or inputs (slave); indicate port contention during simultaneous access |
| INTL, INTR | Interrupt flags | Open-drain compatible outputs; set/cleared via dedicated addresses (1FFFH/1FFEh) |
| M/S | Master/Slave select | H = BUSY outputs enabled; L = BUSY inputs accepted - determines arbitration role |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port memory cells | Enables simultaneous read of identical memory locations without conflict or delay |
| On-chip semaphore logic | Eliminates need for external latches or glue logic to coordinate inter-processor access |
| Hardware port arbitration | Automatic BUSY assertion blocks conflicting writes - no software polling or latency |
| 2V data retention | Preserves memory contents during main power loss; supports seamless failover in critical systems |
| Master/Slave cascading | Allows expansion to 16-bit+ data width using M/S pin without external arbitration circuitry |
Applications
| Real-Time Motion Control | Digital Signal Processing Buffer |
|---|---|
Use Scenario: Coordinating position feedback and command updates between FPGA-based servo controller and microcontroller in CNC machine. IC Role / Device Role / Timing Role: Shared memory buffer with deterministic BUSY arbitration ensures zero-latency handoff of encoder samples and PWM commands. Use Value: Eliminates software handshake overhead; tBDD ≤ 35 ns guarantees sub-microsecond resolution for 20 kHz servo loops. | Use Scenario: Storing intermediate FFT coefficients between ADC acquisition core and DSP algorithm engine in radar front-end. IC Role / Device Role / Timing Role: Dual-port SRAM acts as ping-pong buffer - one port writes new samples while other reads prior frame. Use Value: 55 ns tRC enables full 16-bit sample throughput at >18 MS/s without pipeline stalls. |
| Inter-Processor Communication | Industrial PLC Memory Hub |
Use Scenario: Exchanging status registers and control words between ARM Cortex-M7 safety processor and RISC-V monitoring co-processor. IC Role / Device Role / Timing Role: Semaphore-enabled memory region synchronizes access to shared configuration tables and fault logs. Use Value: 8 hardware semaphores (A0–A2) prevent race conditions without CPU intervention or RTOS kernel overhead. | Use Scenario: Centralized I/O mapping table accessible by multiple ladder logic execution units in modular PLC backplane. IC Role / Device Role / Timing Role: Non-blocking memory hub allows concurrent read of input image and write of output image across distributed scan cycles. Use Value: Industrial temp rating (–40°C to +85°C) and 1 µA ISB3 ensure reliable operation in uncooled control cabinets. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C028V-55AXC | 55 ns access, 8K × 16 organization, 100-pin TQFP, 3.3 V supply | Requires level-shifting for 5 V systems; wider data bus suits DSPs needing 16-bit burst access | Select when migrating to lower-voltage designs or requiring native 16-bit interface |
| AS7C38098A-55JCIN | 55 ns access, 8K × 8, 64-pin TQFP, 3.3 V supply, no BUSY arbitration | Lacks hardware arbitration and semaphore logic; relies on external logic or software coordination | Select only for cost-sensitive, non-contention use cases where arbitration is handled externally |
Compared with CY7C028V-55AXC and AS7C38098A-55JCIN, the IDT7005L55JI uniquely delivers 5 V operation, integrated BUSY arbitration, and semaphore support in the same 64-pin footprint - essential for deterministic real-time inter-processor communication without added components.
Availability
IDT7005L55JI is available at Aetrix Electronics and suitable for real-time motion control, industrial PLCs, digital signal processing buffers, and inter-processor communication systems requiring stable component supply across extended product lifecycles.
Supply support for IDT7005L55JI 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The IDT7005L55JI belongs to IDT's legacy dual-port SRAM product line, engineered specifically for deterministic, low-latency shared-memory architectures in hard real-time embedded systems.
FAQ
What is the guaranteed maximum read cycle time for the IDT7005L55JI?
The IDT7005L55JI has a guaranteed maximum read cycle time (tRC) of 55 ns over the full industrial temperature range (–40°C to +85°C) and supply voltage (4.5 V to 5.5 V). This parameter is production-tested and applies to both left and right ports independently under worst-case conditions.
Does the IDT7005L55JI support battery backup operation, and what voltage is required?
Yes, the IDT7005L55JI supports battery backup operation with guaranteed data retention at 2.0 V (VDR). When main VCC drops below 2.0 V and CE is held high, the device enters data retention mode drawing ≤4000 µA (military/industrial grade), preserving stored data without refresh.
How does the BUSY arbitration mechanism work on the IDT7005L55JI?
The IDT7005L55JI uses hardware-based BUSY arbitration: when M/S = H (master), BUSYL/BUSYR are push-pull outputs that assert LOW to block conflicting writes on the opposite port. Timing parameters like tBDD (≤35 ns) define the delay from BUSY deassertion to valid read data, ensuring deterministic resolution of port contention.
Can the IDT7005L55JI be used in a 16-bit data bus configuration?
Yes, the IDT7005L55JI supports 16-bit expansion via Master/Slave cascading. Two devices can be configured with M/S = H (master) and M/S = L (slave); the master's BUSY output connects to the slave's BUSY input, enabling synchronized access across 16-bit word boundaries without external logic.
What are the key differences between the 'S' and 'L' versions of the IDT7005 family?
The 'L' version (e.g., IDT7005L55JI) offers lower power consumption: 700 mW active (typ.) vs. 750 mW for 'S', and 1 mW standby (typ.) vs. 5 mW. Crucially, only the 'L' version guarantees 2 V data retention - a defining feature for battery-backed applications where main power may fail.
7005L55JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 68-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 64Kbit
- Memory Organization:
- 8K x 8
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 68-PLCC (24.21x24.21)
7005L55JI FAQ
1.How can I place an order for 7005L55JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7005L55JI 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 7005L55JI reliable?
The price and inventory of 7005L55JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7005L55JI is usually 5 days.
3.What payment methods are accepted for 7005L55JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7005L55JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7005L55JI?
7005L55JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7005L55JI 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 7005L55JI?
For technical support, including 7005L55JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7005L55JI requirements.
6.How does Aetrix verify that 7005L55JI is sourced from the original manufacturer or authorized distributors?
All 7005L55JI 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 7005L55JI meets industry standards.
7.What is the process for return or replacement of 7005L55JI?
All 7005L55JI units undergo pre-shipment inspection (PSI). If there is an issue with 7005L55JI, 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 7005L55JI part is unused and in its original packaging.
Return procedure for 7005L55JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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