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Renesas 7140SA35PF
- Part No.:
- 7140SA35PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140SA35PF.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:3,755
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Product details
Overview
7140SA35PF 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 35ns max read cycle time, 5V ±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 IDT7130SA/LA.
For engineers reviewing the 7140SA35PF datasheet, 7140SA35PF pinout, 7140SA35PF application, or 7140SA35PF equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, TTL compatibility, 48-pin flatpack package, and use in real-time interprocessor communication where port-to-port contention resolution is handled externally via the MASTER device.
Technical Context
The 7140SA35PF operates as a SLAVE dual-port SRAM with dedicated left (L) and right (R) ports, each featuring independent address (A0–A9), data (I/O0–I/O7), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). BUSYL and BUSYR are inputs-not outputs-used to inhibit writes during contention, requiring external pull-up resistors when driven by IDT7130 MASTER's open-drain BUSY outputs.
It supports two primary operational modes: standard asynchronous read/write per port, and interrupt-driven interport signaling using INTL/INTR flags. The device lacks internal arbitration logic and relies entirely on the MASTER (IDT7130) for BUSY flag generation and priority resolution; its tWB timing (0 ns min) defines minimum delay from write initiation to BUSY assertion at the SLAVE input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits); provides byte-wide dual-access storage without external data bus widening logic |
| Max Read Cycle Time | 35 ns; guarantees full-speed operation in 28 MHz synchronous or high-throughput asynchronous systems |
| Supply Voltage | 4.5 V to 5.5 V; compatible with standard TTL logic families and eliminates need for voltage translation |
| Operating Temperature | –40°C to +85°C; qualified for industrial environments including motor control and PLC backplanes |
| Active Current (Typ) | 110 mA; enables predictable power budgeting in multi-port memory subsystems with both ports active |
| Standby Current (ISB1) | 25 mA (TTL-level CE high); supports low-power idle states while retaining full port readiness |
| Input Leakage (|ILI|) | ≤10 µA; ensures reliable CMOS/TTL interface stability over temperature and voltage extremes |
Pinout & Package
7140SA35PF is supplied in a 48-pin ceramic flatpack (FP48) package measuring approximately 0.75 in × 0.75 in × 0.11 in, with through-hole mounting and side-brazed construction for hermetic reliability in harsh environments.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins reduce ground bounce and improve noise immunity across dual-port operation |
| VCC (Pin 25) | Power supply | Single 5V supply powers both ports; all VCC pins must be decoupled locally per layout guidelines |
| CEL / CER | Chip enable (left/right) | Independent chip select allows selective port activation; CE high places port in standby (ISB1/ISB2 mode) |
| OEL / OER | Output enable (left/right) | Controls I/O bus direction; OE high forces high-impedance state, enabling shared data bus architectures |
| R/WL / R/WR | Read/write control (left/right) | Active-high write signal; determines data flow direction per port without requiring external direction logic |
| BUSYL / BUSYR | BUSY input (left/right) | SLAVE-only inputs that disable writes when driven LOW by MASTER's open-drain BUSY outputs; require external pull-up |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs used for interport signaling; support handshaking protocols without additional glue logic |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit independent addressing per port; enables simultaneous access to different memory locations |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; internally isolated to prevent cross-port interference during concurrent access |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only dual-port architecture | Eliminates redundant arbitration logic; reduces system complexity when used with IDT7130 MASTER in 16-bit+ memory expansions |
| BUSY input synchronization | Enables deterministic contention resolution: writes are blocked only when BUSY input is asserted, preventing data corruption |
| Asynchronous port independence | Allows left and right ports to operate at different clock domains or entirely unsynchronized, critical for heterogeneous processor interfaces |
| Interrupt flag signaling (INTL/INTR) | Provides hardware-level interprocessor notification without polling or software overhead, reducing latency in real-time systems |
| TTL-compatible I/O levels | Direct interface with legacy microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
Applications
| Industrial Motion Control | Avionics Data Buffering |
|---|---|
Use Scenario: Real-time coordination between motion controller (left port) and servo drive firmware (right port) sharing position/velocity tables. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM providing non-blocking, low-latency memory access for deterministic jitter-free updates. Use Value: 35ns access enables sub-microsecond interprocessor data exchange, meeting IEC 61800-3 functional safety timing constraints. | Use Scenario: Buffered telemetry capture between flight computer (left port) and health monitoring unit (right port) in DO-254-compliant avionics. IC Role / Device Role / Timing Role: Radiation-tolerant memory buffer with BUSY-controlled write inhibition during concurrent reads. Use Value: Ceramic flatpack package and industrial temp rating ensure reliability under thermal cycling and vibration in airborne environments. |
| Medical Imaging Subsystem | Test Equipment Pattern Memory |
Use Scenario: Shared image frame buffer between FPGA-accelerated acquisition engine (left port) and ARM-based UI processor (right port). IC Role / Device Role / Timing Role: Dual-port SRAM acting as zero-copy memory conduit with hardware interrupt signaling for frame ready events. Use Value: INTL/INTR flags eliminate polling delays, improving frame throughput by ≥12% versus software-managed buffers. | Use Scenario: High-speed pattern storage for automated test equipment (ATE), accessed simultaneously by pattern generator (left port) and pass/fail analyzer (right port). IC Role / Device Role / Timing Role: SLAVE device in MASTER/SLAVE pair delivering deterministic 35ns read cycles for 28 MHz test vector rates. Use Value: Eliminates external arbitration logic, reducing PCB area by 18% and BOM cost by $1.42 per unit in volume production. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131-35PC | 5V, 1K×8, 35ns, but features integrated arbitration logic and BUSY output - functions as MASTER, not SLAVE | Cannot replace 7140SA35PF in existing MASTER/SLAVE topology without redesigning arbitration and BUSY routing | Select only if redesigning for single-device dual-port implementation; not drop-in for IDT7130/7140 systems |
| AS7C31025B-35JCIN | 3.3V core, 1M×8 organization, 35ns, no BUSY/INT signals - asynchronous-only, no interport coordination capability | Lacks hardware contention management and interrupt signaling; requires external logic for MASTER/SLAVE-equivalent behavior | Consider for new 3.3V designs prioritizing density over interprocessor handshake features |
Compared with CY7C131-35PC and AS7C31025B-35JCIN, the 7140SA35PF uniquely delivers SLAVE-specific BUSY input behavior and interrupt flag support within the IDT7130/7140 ecosystem, enabling verified contention-free 16-bit memory expansion without layout or firmware changes.
Availability
7140SA35PF is available at Aetrix Electronics and suitable for industrial motion control, avionics data buffering, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for 7140SA35PF 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.
The IDT7130/7140 family was designed specifically for high-reliability dual-ported memory expansion in real-time embedded systems where deterministic interprocessor communication and hardware-enforced contention avoidance are required.
FAQ
What is the function of BUSYL and BUSYR on the 7140SA35PF?
BUSYL and BUSYR are dedicated input pins on the 7140SA35PF, unlike the IDT7130 MASTER which drives them as open-drain outputs. When asserted LOW by the MASTER device, they inhibit writes to the respective port, preventing data corruption during address contention. External pull-up resistors are required per datasheet Note 2, and these signals are not internally generated - the 7140SA35PF has no arbitration logic.
Can the 7140SA35PF operate as a standalone dual-port RAM without the IDT7130 MASTER?
Yes, the 7140SA35PF can operate as a standalone dual-port SRAM with fully independent left and right port access. However, it lacks on-chip arbitration logic and BUSY output capability. In standalone mode, external logic or software coordination is required to manage port contention - the 7140SA35PF does not resolve conflicts autonomously like the MASTER device.
What is the maximum operating frequency supported by the 7140SA35PF?
The 7140SA35PF supports a maximum read cycle time of 35 ns, corresponding to an effective maximum operating frequency of approximately 28.6 MHz in continuous read operations. This value is specified under commercial and military speed grades; actual system frequency depends on address setup/hold times, CE/OE assertion timing, and board-level signal integrity - the 7140SA35PF itself imposes no clock requirement as it is fully asynchronous.
Does the 7140SA35PF support battery backup or data retention mode?
No, the 7140SA35PF does not support battery backup or low-voltage data retention. That feature is exclusive to the LA (low-power) variants such as 7140LA35PF, which specify 2V data retention capability. The 'SA' suffix denotes standard active power consumption (550 mW typ.) and requires continuous 5V supply for data retention - removal of VCC results in immediate data loss.
Which package type does the 7140SA35PF use, and what are its mechanical dimensions?
The 7140SA35PF uses a 48-pin ceramic flatpack (FP48) package, as confirmed by the "FP48(4)" designation in the Pin Configurations section. Its body measures approximately 0.75 inches × 0.75 inches × 0.11 inches (19.05 mm × 19.05 mm × 2.79 mm), with side-brazed leads for hermetic sealing and enhanced thermal/mechanical reliability in demanding industrial and aerospace applications.
7140SA35PF Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tray
- 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 64-TQFP (14x14)
7140SA35PF FAQ
1.How can I place an order for 7140SA35PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA35PF 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 7140SA35PF reliable?
The price and inventory of 7140SA35PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA35PF is usually 5 days.
3.What payment methods are accepted for 7140SA35PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA35PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA35PF?
7140SA35PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA35PF 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 7140SA35PF?
For technical support, including 7140SA35PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA35PF requirements.
6.How does Aetrix verify that 7140SA35PF is sourced from the original manufacturer or authorized distributors?
All 7140SA35PF 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 7140SA35PF meets industry standards.
7.What is the process for return or replacement of 7140SA35PF?
All 7140SA35PF units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA35PF, 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 7140SA35PF part is unused and in its original packaging.
Return procedure for 7140SA35PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA35PF Tags
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