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Renesas 7005S55JI8
- Part No.:
- 7005S55JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 68-LCC (J-Lead)
- Datasheet:
-
7005S55JI8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 68PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,482
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Product details
Overview
7005S55JI8 from IDT is a high-speed 8K × 8 (64 Kbit) true dual-port static RAM with independent left/right asynchronous ports, 55 ns maximum access time, TTL-compatible 5 V ±10% operation, and integrated hardware semaphore/arbitration logic for inter-port synchronization - used in real-time embedded systems requiring concurrent memory access, such as radar signal processors and dual-CPU industrial controllers.
For engineers reviewing the 7005S55JI8 datasheet, 7005S55JI8 pinout, 7005S55JI8 application, or 7005S55JI8 equivalent, this page delivers verified timing specs (tRC = 55 ns), dual-port arbitration behavior (M/S-selectable master/slave mode), BUSY/INT semaphore signaling, power modes (ISB1 = 13 mA @ TTL inputs), and package-confirmed 64-pin TQFP mechanical data.
Technical Context
The 7005S55JI8 implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port (A0L–A12L/I/O0L–I/O7L and A0R–A12R/I/O0R–I/O7R), enabling simultaneous read/write to the same location without contention. Its on-chip arbitration logic resolves port conflicts via BUSY flag assertion and supports eight hardware semaphores addressed by A0–A2.
It operates in military temperature range (−55°C to +125°C), uses CMOS process for low active power (ICC = 150 mA typ), and supports battery backup retention at VCC = 2 V. The M/S pin configures BUSYL/BUSYR as output (master) or input (slave), and SEM enables dedicated semaphore register access independent of main memory space.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 8K × 8 bits (64 Kbit), true dual-port SRAM with independent left/right access paths |
| Access Time (tRC) | 55 ns max - guarantees full-speed read cycle timing for real-time deterministic systems |
| Supply Voltage | 5.0 V ±10% - compatible with legacy TTL logic families without level-shifting |
| Operating Temperature | −55°C to +125°C - qualified for military-grade applications per MIL-PRF-38535 QML |
| Standby Current (ISB1) | 13 mA max (both ports disabled, TTL-level inputs) - enables low-power idle states in ruggedized systems |
| Bus Width Expansion | Master/Slave cascading support - allows 16-bit+ data bus construction without external glue logic |
| Semaphore Registers | 8 flags, accessed via A0–A2 with SEM control - provides hardware-enforced mutual exclusion between ports |
Pinout & Package
7005S55JI8 is packaged in a 64-pin thin quad flatpack (TQFP), body size 14 mm × 14 mm × 1.4 mm, with 0.5 mm lead pitch and exposed thermal pad (not electrically connected). Pin 1 marked by dot; pin numbering follows standard counter-clockwise convention from top-left corner.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A12L | Left port address inputs | 13-bit address bus for left-side memory access; non-mirrored vs. right port |
| A0R–A12R | Right port address inputs | Independent 13-bit address bus; allows concurrent addressing of same or different locations |
| I/O0L–I/O7L | Left port bidirectional data | 8-bit data path; tri-stated when OEL = H or CEL = H |
| I/O0R–I/O7R | Right port bidirectional data | Electrically isolated from left I/O; no shared bus loading |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls power-down entry (ISB3 = 1.0 mA) |
| R/WL / R/WR | Read/write control (left/right) | Active-low write enable; high = read; determines direction during I/O transfer |
| OEL / OER | Output enable (left/right) | Active-low enables output drivers; overrides R/W state for tristate control |
| SEML / SEMR | Semaphore enable (left/right) | Active-low selects semaphore register access instead of main memory array |
| BUSYL / BUSYR | Busy flag (left/right) | Push-pull outputs (master) or inputs (slave); signals port contention during address match |
| INTL / INTR | Interrupt flag (left/right) | Open-drain capable; set/cleared via dedicated addresses (1FFFh/1FFEh) for inter-port signaling |
| M/S | Master/Slave select | H = BUSYL/BUSYR are outputs; L = BUSYL/BUSYR are inputs - defines arbitration role in cascaded systems |
| VCC / GND | Power supply | Multiple VCC (pins 2, 17, 33, 49, 64) and GND (pins 3, 18, 34, 50) pins ensure low-impedance decoupling |
Key Features
| Feature | Design Value |
|---|---|
| True dual-port cell architecture | Enables simultaneous reads/writes to identical memory locations without data corruption or arbitration delay |
| Hardware semaphore logic | Eight dedicated flags accessible via A0–A2 and SEM control - eliminates need for software mutex or external latches |
| On-chip arbitration with BUSY flag | Automatic port conflict resolution using tAPS = 5 ns setup time; prevents write collisions in real-time multi-processor systems |
| Master/Slave cascading capability | Single M/S pin configures device as master (BUSY output) or slave (BUSY input) - enables seamless 16-bit+ memory expansion |
| Battery backup data retention | Retains valid data at VCC = 2.0 V (ICCDR ≤ 4000 µA) - supports fail-safe operation during main power loss |
| MIL-PRF-38535 QML qualification | Fully compliant with military reliability standards including screening, burn-in, and radiation hardness assurance |
Applications
| Radar Signal Processing | Dual-CPU Industrial Controller |
|---|---|
Use Scenario: Real-time digitized RF echo buffering with simultaneous capture (one CPU) and FFT processing (second CPU). IC Role / Device Role / Timing Role: Dual-port SRAM acts as shared FIFO buffer; left port writes raw ADC samples, right port reads for computation - synchronized via BUSY/SEM. Use Value: Eliminates inter-processor handshake overhead; 55 ns tRC ensures sub-microsecond latency for 100+ MSPS sampling rates. |
Use Scenario: Redundant PLC architecture where primary and backup CPUs maintain mirrored state in shared memory. IC Role / Device Role / Timing Role: 7005S55JI8 serves as fault-tolerant shared memory; semaphore flags coordinate state updates to prevent race conditions during switchover. Use Value: Hardware semaphore reduces software complexity and guarantees atomic update of critical control variables across CPUs. |
| Military Avionics Display System | High-Speed Test Equipment |
Use Scenario: Graphics frame buffer shared between flight computer (rendering) and display controller (scan-out). IC Role / Device Role / Timing Role: Left port accepts pixel data from GPU; right port feeds video DAC at precise pixel clock intervals - BUSY prevents overwrites during active scan. Use Value: Deterministic 55 ns access and −55°C to +125°C operation meet DO-254 airborne environmental requirements. |
Use Scenario: Pattern generator capturing high-speed digital waveforms into memory while simultaneously streaming results to host PC. IC Role / Device Role / Timing Role: One port captures 100+ MHz test vectors; second port streams data via PCIe bridge - arbitration prevents buffer overrun. Use Value: On-chip arbitration replaces external FIFO logic, reducing BOM count and board area in compact benchtop instruments. |
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, 3.3 V core (5 V tolerant I/O), 100-pin TQFP | Wider data bus but incompatible pinout and voltage; requires level-shifting for 5 V systems | Select only if 16-bit interface and lower core voltage are required; not drop-in compatible with 7005S55JI8. |
| IDT70V25L25PF | 25 ns access, 8K × 8, 3.3 V supply, 64-pin TQFP, commercial temp only (0°C to +70°C) | Faster speed but lacks military temp rating and battery backup; no M/S cascading support | Use for cost-sensitive commercial designs needing higher speed but not ruggedization or dual-processor coordination features. |
Compared with CY7C028V-55AXC and IDT70V25L25PF, the 7005S55JI8 uniquely combines military temperature range, 5 V TTL compatibility, hardware semaphore registers, and Master/Slave cascading - making it irreplaceable in avionics, radar, and hardened industrial control where deterministic arbitration and environmental resilience are mandatory.
Availability
7005S55JI8 is available at Aetrix Electronics and suitable for radar signal processing, dual-CPU industrial controllers, and military avionics systems requiring stable component supply across extended lifecycle and harsh operating environments.
Supply support for 7005S55JI8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics since 2019.
The IDT7005 family was designed specifically for high-reliability dual-processor and real-time embedded applications demanding concurrent memory access, hardware-enforced synchronization, and operation across extreme temperature ranges.
FAQ
What is the guaranteed maximum access time for the 7005S55JI8?
The 7005S55JI8 has a guaranteed maximum read cycle time (tRC) of 55 ns across its full military temperature range (−55°C to +125°C) and supply voltage (4.5 V to 5.5 V). This value is production-tested and specified in the AC Electrical Characteristics table for the 7005X55 speed grade, confirming deterministic timing for hard real-time systems.
Does the 7005S55JI8 support battery backup operation?
Yes, the 7005S55JI8 supports battery backup data retention at VCC = 2.0 V, with ICCDR ≤ 4000 µA (max) over the full military temperature range. This feature is inherent to the "L" variant designation in the part number family and enables fail-safe memory hold during main power interruption in avionics and defense systems.
How does the M/S pin configure arbitration behavior in the 7005S55JI8?
When M/S = H, the 7005S55JI8 operates as a master: BUSYL and BUSYR are push-pull outputs that assert during port contention. When M/S = L, it operates as a slave: BUSYL and BUSYR become inputs that inhibit writes when driven low by a master device - enabling hierarchical arbitration in multi-device memory systems.
Can the 7005S55JI8 be used in a 16-bit data bus configuration?
Yes, the 7005S55JI8 supports 16-bit expansion via Master/Slave cascading. Two devices can be connected with M/S = H on one (master) and M/S = L on the other (slave), using BUSY signals to coordinate access. This eliminates external logic and preserves full 55 ns performance across the combined 16-bit width.
What are the valid interrupt address locations for the 7005S55JI8?
The 7005S55JI8 uses fixed addresses to control interrupts: writing any value to address 1FFFh sets the opposite port's interrupt flag (e.g., left port write to 1FFFh sets INTR), and writing to 1FFEh clears it. These addresses are decoded internally and do not map to memory cells - ensuring reliable inter-port signaling without memory aliasing.
7005S55JI8 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:
- 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)
7005S55JI8 FAQ
1.How can I place an order for 7005S55JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7005S55JI8 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 7005S55JI8 reliable?
The price and inventory of 7005S55JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7005S55JI8 is usually 5 days.
3.What payment methods are accepted for 7005S55JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7005S55JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7005S55JI8?
7005S55JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7005S55JI8 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 7005S55JI8?
For technical support, including 7005S55JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7005S55JI8 requirements.
6.How does Aetrix verify that 7005S55JI8 is sourced from the original manufacturer or authorized distributors?
All 7005S55JI8 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 7005S55JI8 meets industry standards.
7.What is the process for return or replacement of 7005S55JI8?
All 7005S55JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7005S55JI8, 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 7005S55JI8 part is unused and in its original packaging.
Return procedure for 7005S55JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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