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Renesas 7140SA35PF8
- Part No.:
- 7140SA35PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140SA35PF8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,829
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Product details
Overview
IDT7140SA35PF8 from Integrated Device Technology (IDT) is a high-speed 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 maximum read cycle time, TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems without external arbitration logic in real-time digital signal processing applications.
For engineers reviewing the IDT7140SA35PF8 datasheet, IDT7140SA35PF8 pinout, IDT7140SA35PF8 application, or IDT7140SA35PF8 equivalent, key selection criteria include BUSY input behavior (not output), absence of on-chip arbitration logic, INT flag support for inter-port signaling, and compatibility with IDT7130SA/X35 MASTER devices in dual-port memory subsystems.
Technical Context
The IDT7140SA35PF8 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). Unlike the MASTER IDT7130, it lacks on-chip arbitration logic and receives BUSY signals (BUSYL/BUSYR) as inputs to inhibit writes during contention.
It supports port-to-port communication via INTL/INTR flags and requires external pull-up resistors on open-drain BUSY inputs. Its timing includes tBDD (BUSY disable to valid data) of 35 ns max and tWDD (write pulse to data delay) of 60 ns max, ensuring deterministic arbitration response when paired with IDT7130SA35 devices.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit data width per port) |
| Access Time | 35 ns maximum read cycle time - guarantees worst-case latency for real-time control loops |
| Supply Voltage | 5.0 V ±10% - compatible with standard TTL logic families without level-shifting |
| Operating Temp | –40°C to +85°C - qualified for industrial embedded systems with thermal cycling |
| Power (Active) | 110 mA typical dynamic current - enables low-heat dissipation in dense PCB layouts |
| Power (Standby) | 25 mA typical ISB2 (one port active) - reduces system power during idle intervals |
| BUSY Role | Input-only (not output) - must be driven by external MASTER or arbitration circuitry |
Pinout & Package
Package: 48-pin ceramic flatpack (FP48), body size ≈ 0.75 in × 0.75 in × 0.11 in, hermetically sealed for high-reliability industrial/military use.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins reduce ground bounce during simultaneous port switching |
| VCC (Pin 25) | Power supply | Single 5V supply pin - decoupling capacitor required within 0.5 inch |
| CEL / CER | Chip enable (left/right) | Independent chip select per port enables selective port activation without bus contention |
| OEL / OER | Output enable (left/right) | Controls tri-state of I/O drivers - critical for shared data bus architectures |
| R/WL / R/WR | Read/write direction (left/right) | Active-HIGH write control - simplifies interface with microcontroller address/data buses |
| BUSYL / BUSYR | BUSY input (left/right) | Open-drain inputs requiring external pull-up - assert LOW to block writes during arbitration |
| INTL / INTR | Interrupt flag (left/right) | Push-pull outputs used for inter-port event signaling (e.g., buffer full notification) |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address per port - supports full 1K memory map without external decoding |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths - no direction control pin needed due to R/W-driven I/O state |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER, reducing BOM count and layout complexity |
| Asynchronous dual-port operation | Enables concurrent read/write access from independent controllers (e.g., DSP + host CPU) without clock domain synchronization |
| INTL/INTR inter-port signaling | Hardware interrupt flags allow lock-free coordination between ports - avoids polling overhead in real-time firmware |
| TTL-compatible interface | Direct connection to 5V microcontrollers, FPGAs, and ASICs without level translators or bus buffers |
| Industrial temperature rating | Validated operation from –40°C to +85°C - suitable for factory automation, motor drives, and outdoor telecom equipment |
Applications
| Digital Signal Processing Systems | Real-Time Industrial Controllers |
|---|---|
Use Scenario: Dual-processor architecture where a DSP writes processed sensor data to shared memory while a microcontroller reads it for HMI updates and network reporting. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM provides non-blocking memory access between asynchronous clock domains with 35 ns latency bound. Use Value: Eliminates software semaphores and reduces inter-processor latency by >60% compared to single-port SRAM with arbitration logic. | Use Scenario: PLC backplane with separate motion control and I/O scanning engines accessing shared configuration and status registers. IC Role / Device Role / Timing Role: Acts as contention-managed shared memory using BUSY inputs from MASTER arbitration unit to prevent write collisions. Use Value: Guarantees deterministic response time (<35 ns) for safety-critical motion update cycles without CPU intervention. |
| Communications Protocol Bridges | Test & Measurement Equipment |
Use Scenario: UART-to-Ethernet bridge where one port handles serial frame assembly and the other manages TCP/IP packet buffering. IC Role / Device Role / Timing Role: SLAVE device synchronized to IDT7130 MASTER ensures atomic 16-bit word transfers across protocol boundaries. Use Value: Prevents frame corruption during simultaneous serial receive and Ethernet transmit operations at line rate. | Use Scenario: Oscilloscope acquisition subsystem where ADC controller writes samples to memory while display processor reads waveform data. IC Role / Device Role / Timing Role: Provides zero-wait-state memory access for both high-throughput sampling (≥10 MS/s) and real-time rendering. Use Value: Enables continuous acquisition mode with <1 µs dead time between trigger events due to dual-port concurrency. |
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, 5V, 1K × 8, but uses different BUSY arbitration model (bidirectional BUSY) and lacks INT flag | Requires redesign of arbitration logic and inter-port signaling; not drop-in for IDT7130/7140 systems | Select only if migrating from legacy Cypress-based designs or when INT flag is unused |
| IS61LV25616AL-10TL | 10 ns access, 3.3V supply, 256K × 16 organization - incompatible voltage, density, and pinout | Not suitable for 5V TTL systems or 1K × 8 memory maps; requires level shifters and PCB redesign | Consider only for new 3.3V designs needing higher density and speed, not as replacement |
Compared with CY7C131-35JC and IS61LV25616AL-10TL, the IDT7140SA35PF8 uniquely supports seamless integration into existing IDT7130-based MASTER/SLAVE systems with hardware INT signaling and defined BUSY input timing, preserving system-level timing margins and eliminating arbitration logic redesign.
Availability
IDT7140SA35PF8 is available at Aetrix Electronics and suitable for digital signal processing systems, real-time industrial controllers, communications protocol bridges, and test & measurement equipment requiring stable component supply across extended product lifecycles.
Supply support for IDT7140SA35PF8 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions for communications, computing, and industrial markets.
IDT7140SA35PF8 belongs to the IDT7130/7140 dual-port SRAM product line, designed specifically for high-reliability, low-latency shared-memory subsystems in real-time embedded systems requiring deterministic arbitration and inter-processor communication.
FAQ
What is the function of BUSYL and BUSYR on the IDT7140SA35PF8?
BUSYL and BUSYR are input-only signals on the IDT7140SA35PF8, unlike the MASTER IDT7130 where they are outputs. When driven LOW by an external MASTER or arbitration circuit, they inhibit writes to the corresponding port. External pull-up resistors are required as these pins are open-drain. The IDT7140SA35PF8 does not generate BUSY signals internally.
Can IDT7140SA35PF8 operate standalone without an IDT7130 MASTER device?
Yes, the IDT7140SA35PF8 can operate as a standalone dual-port SRAM, but it lacks on-chip arbitration logic and BUSY generation capability. In standalone use, external arbitration (e.g., FPGA logic or discrete gates) must manage port contention. Its primary design intent is SLAVE operation alongside IDT7130 devices for simplified 16-bit+ memory expansion.
What is the maximum operating frequency supported by IDT7140SA35PF8?
The IDT7140SA35PF8 does not operate on a clock; it is fully asynchronous. Its performance is specified by timing parameters: 35 ns maximum read cycle time (tRC), 35 ns maximum write cycle time (tWC), and 35 ns maximum BUSY disable to valid data (tBDD). These define the minimum interval between successive accesses, not a clock frequency.
Does IDT7140SA35PF8 support battery backup or data retention mode?
No, the IDT7140SA35PF8 is an SA (Standard Active) version and does not support battery backup. Data retention capability is exclusive to LA (Low-power Active) variants like IDT7140LA35PF8, which retain data at 2.0 V down to 100 µA typical current. The SA version requires continuous 5V supply for data integrity.
How does the INTL/INTR interrupt functionality work on IDT7140SA35PF8?
INTL and INTR are push-pull interrupt flags on IDT7140SA35PF8. Writing to address 3FFH on one port sets the INTR flag on the opposite port; writing to 3FEH clears it. This enables hardware-level inter-port signaling without polling - for example, a DSP can set INTR to notify a microcontroller that new data is ready in shared memory.
7140SA35PF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 64-LQFP
- Packaging:
- Tape & Reel (TR)
- 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)
7140SA35PF8 FAQ
1.How can I place an order for 7140SA35PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA35PF8 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 7140SA35PF8 reliable?
The price and inventory of 7140SA35PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA35PF8 is usually 5 days.
3.What payment methods are accepted for 7140SA35PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA35PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA35PF8?
7140SA35PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA35PF8 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 7140SA35PF8?
For technical support, including 7140SA35PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA35PF8 requirements.
6.How does Aetrix verify that 7140SA35PF8 is sourced from the original manufacturer or authorized distributors?
All 7140SA35PF8 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 7140SA35PF8 meets industry standards.
7.What is the process for return or replacement of 7140SA35PF8?
All 7140SA35PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA35PF8, 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 7140SA35PF8 part is unused and in its original packaging.
Return procedure for 7140SA35PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA35PF8 Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
Microchip Technology
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AT24C08C-STUM-T
Microchip Technology
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