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Renesas 7140SA35JI
- Part No.:
- 7140SA35JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140SA35JI.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,940
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Product details
Overview
7140SA35JI from IDT is a 1K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, supporting fully asynchronous left/right port access with 35 ns max read cycle time, 5 V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external logic when paired with IDT7130 MASTER.
For engineers reviewing the 7140SA35JI datasheet, 7140SA35JI pinout, 7140SA35JI application, or 7140SA35JI equivalent, this page delivers verified timing parameters, BUSY input behavior, CE/R/W-controlled write operation, and SLAVE-specific arbitration interface requirements for real-time embedded memory design.
Technical Context
The 7140SA35JI implements a true dual-port architecture with independent address, control, and I/O buses per port-left (L) and right (R)-enabling concurrent read/write operations. Its BUSY pins (BUSYL, BUSYR) are dedicated inputs that inhibit writes when asserted low, unlike the MASTER IDT7130's open-drain BUSY outputs.
Arbitration is handled externally via the MASTER device; the 7140SA35JI relies on BUSY assertion from the MASTER to prevent simultaneous writes to the same address. It supports interrupt flag generation (INTL/INTR) and operates with TTL-compatible logic levels under single 5 V supply.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), no internal parity or ECC |
| Max Read Cycle Time | 35 ns - defines minimum time between successive reads on same port |
| Supply Voltage | 4.5 V to 5.5 V - requires stable 5 V ±10% rail; no battery backup support (SA grade) |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade reliability and thermal cycling |
| Active Current (Typ) | 110 mA - measured at fMAX with both ports active and outputs disabled |
| Standby Current (Typ) | 25 mA - with both chip enables high (TTL-level inputs), f = fMAX |
| I/O Interface | TTL-compatible - VIH ≥ 2.2 V, VIL ≤ 0.8 V, VOH ≥ 2.4 V at –4 mA, VOL ≤ 0.4 V at 4 mA |
Pinout & Package
7140SA35JI is packaged in a 48-pin ceramic flatpack (FP48), body size ≈ 0.75 in × 0.75 in × 0.11 in, with 2×24 pin grid, pin 1 index marked, and all VCC/GND pins requiring direct connection to respective power planes.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | Four dedicated ground pins reduce ground bounce and improve noise immunity across dual-port operation |
| VCC (Pins 23, 26) | Power supply | Two 5 V supply pins minimize IR drop and support simultaneous port switching current demands |
| CEL / CER | Chip enable (left/right) | Asynchronous enable per port; drives device into standby when high (ISB1/ISB2 mode) |
| OEL / OER | Output enable (left/right) | Controls I/O bus direction: low enables output drivers, high places I/O in high-Z state |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; must be stable during address and CE transitions per port |
| BUSYL / BUSYR | Arbitration input (left/right) | SLAVE-only inputs - low inhibits write cycles on corresponding port; require pull-up resistors externally |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs - used for inter-port signaling; require external pull-up for logic-H level |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses - support full 1K address space per port; no internal address latching |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data buses - driven only when OE low and R/W high (read) or R/W low (write) |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous operation | Enables concurrent CPU/DSP or processor/peripheral access to shared memory without clock synchronization |
| SLAVE arbitration interface | BUSYL/BUSYR inputs directly integrate with IDT7130 MASTER's open-drain BUSY outputs for hardware-enforced conflict resolution |
| Port-to-port interrupt signaling | INTL/INTR flags allow one port to notify the other of event completion or status change without polling |
| Low-power standby modes | ISB1 (25 mA typ) and ISB3 (0.2 mA typ) support dynamic power gating based on port activity state |
| TTL-compatible I/O | Eliminates need for level-shifting logic when interfacing with legacy 5 V microcontrollers and FPGAs |
Applications
| Real-Time DSP Buffering | Industrial PLC Memory Expansion |
|---|---|
Use Scenario: Dual-core DSP system where one core processes sensor data while the other handles motor control, sharing intermediate results via common memory. IC Role / Device Role / Timing Role: 7140SA35JI acts as SLAVE port in 16-bit-wide memory bank with IDT7130 MASTER, enabling zero-wait-state concurrent access. Use Value: Eliminates software arbitration overhead and guarantees deterministic latency (<35 ns read) for time-critical control loops. | Use Scenario: Modular programmable logic controller with separate I/O processor and main CPU accessing shared configuration and status tables. IC Role / Device Role / Timing Role: 7140SA35JI provides isolated, conflict-free memory access for CPU and I/O processor using hardware BUSY handshake. Use Value: Prevents data corruption during simultaneous register updates and eliminates need for semaphore-based firmware coordination. |
| Military Avionics Data Exchange | Test Equipment Pattern Memory |
Use Scenario: Radar signal processor exchanging frame metadata with flight management unit across radiation-hardened interconnect. IC Role / Device Role / Timing Role: 7140SA35JI serves as SLAVE in MIL-PRF-38535 QML-compliant dual-port RAM subsystem with IDT7130 MASTER. Use Value: Meets –55°C to +125°C extended temp grade requirements and supports error-free operation under EMI stress via hardware arbitration. | Use Scenario: Automated test equipment storing multi-cycle digital stimulus patterns for high-speed semiconductor validation. IC Role / Device Role / Timing Role: 7140SA35JI buffers pattern data on one port while test sequencer reads on the other at 28.6 MHz (35 ns cycle). Use Value: Enables continuous pattern streaming without CPU intervention, sustaining >28 MHz sustained throughput with deterministic timing. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131-35JC | 35 ns access, 1K × 8, but uses separate BYTE controls instead of full port enable; no native BUSY arbitration logic | Requires external glue logic for MASTER/SLAVE arbitration; not drop-in compatible with IDT7130/7140 topology | Select only if redesigning arbitration layer and prioritizing Cypress ecosystem support over plug-and-play compatibility |
| AS7C31025B-35JC | 35 ns, 1K × 8, TTL-compatible, but lacks dedicated BUSY/INT pins and dual-port interrupt capability | Suitable for simple dual-CPU sharing but cannot replicate IDT7130/7140 hardware arbitration or inter-port signaling | Choose when cost sensitivity outweighs need for hardware-enforced conflict resolution and interrupt-driven synchronization |
Compared with CY7C131-35JC and AS7C31025B-35JC, the 7140SA35JI uniquely integrates SLAVE-specific BUSY inputs and INT outputs to enable seamless, logic-free expansion with IDT7130 MASTER-critical for deterministic real-time systems where arbitration latency must be bounded in hardware.
Availability
7140SA35JI is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and test equipment requiring stable component supply, long-lifecycle support, and MIL-PRF-38535 QML-compliant sourcing.
Supply support for 7140SA35JI 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 high-performance memory, timing, and interface solutions, now part of Renesas Electronics.
The 7140SA35JI belongs to IDT's legacy dual-port SRAM product line, designed specifically for deterministic, hardware-arbitrated memory sharing in real-time embedded systems requiring concurrent processor and peripheral access.
FAQ
What is the function of BUSYL and BUSYR on the 7140SA35JI?
BUSYL and BUSYR are dedicated arbitration inputs on the 7140SA35JI. When either pin is driven low by an external MASTER device (e.g., IDT7130), writes to the corresponding port are internally inhibited. These pins require external pull-up resistors and are not bidirectional-unlike the MASTER's open-drain BUSY outputs. This design ensures conflict-free memory access in SLAVE-only configurations.
Can the 7140SA35JI operate as a standalone dual-port RAM without a MASTER device?
Yes, the 7140SA35JI can operate as a standalone dual-port RAM. Its left and right ports function independently with full asynchronous read/write capability. However, hardware arbitration (via BUSY) and inter-port interrupt signaling (via INTL/INTR) require coordination with a MASTER device like IDT7130. In standalone use, external logic must manage address contention and synchronization.
What is the maximum operating frequency supported by the 7140SA35JI?
The 7140SA35JI supports a maximum read cycle time of 35 ns, corresponding to a theoretical maximum sustained throughput of ~28.6 MHz per port. This assumes proper setup/hold timing compliance (e.g., tAS = 0 ns, tOH = 3 ns) and valid address/control stability. Write cycle time (tWC) is also 35 ns, enabling balanced read/write bandwidth in real-time buffering applications.
Does the 7140SA35JI support battery backup or data retention below 5 V?
No, the 7140SA35JI does not support battery backup or low-voltage data retention. It is the SA (Standard Active) variant-unlike the LA version, which guarantees data retention down to 2.0 V. The 7140SA35JI requires continuous 4.5–5.5 V supply for reliable operation; loss of VCC results in immediate data loss.
Which packages are available for the 7140SA35JI, and what is its pin count?
The 7140SA35JI is offered in a 48-pin ceramic flatpack (FP48) package, with body dimensions approximately 0.75 in × 0.75 in × 0.11 in. Pin 1 is index-marked. While the datasheet notes availability in DIP, LCC, PLCC, and TQFP variants for the 7140 family, the "JI" suffix specifically denotes the FP48 industrial-grade ceramic package for this speed grade.
7140SA35JI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 8Kbit
- Memory Organization:
- 1K 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:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7140SA35JI FAQ
1.How can I place an order for 7140SA35JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA35JI 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 7140SA35JI reliable?
The price and inventory of 7140SA35JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA35JI is usually 5 days.
3.What payment methods are accepted for 7140SA35JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA35JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA35JI?
7140SA35JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA35JI 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 7140SA35JI?
For technical support, including 7140SA35JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA35JI requirements.
6.How does Aetrix verify that 7140SA35JI is sourced from the original manufacturer or authorized distributors?
All 7140SA35JI 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 7140SA35JI meets industry standards.
7.What is the process for return or replacement of 7140SA35JI?
All 7140SA35JI units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA35JI, 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 7140SA35JI part is unused and in its original packaging.
Return procedure for 7140SA35JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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