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Renesas 7140SA55PF8
- Part No.:
- 7140SA55PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140SA55PF8.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:4,397
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Product details
Overview
7140SA55PF8 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 55 ns max read/write cycle time, TTL-compatible 5V ±10% operation, 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 7140SA55PF8 datasheet, 7140SA55PF8 pinout, 7140SA55PF8 application, or 7140SA55PF8 equivalent, this page delivers verified timing parameters, BUSY input behavior, CE/R/W-controlled write timing, industrial-grade power specs, and confirmed SLAVE-side arbitration interface requirements.
Technical Context
The 7140SA55PF8 implements independent left and right ports with separate address (A0L–A9L / A0R–A9R), data (I/O0L–I/O7L / I/O0R–I/O7R), and control lines (CEL/CER, OEL/OER, R/WL/R/WR). Its BUSY pins (BUSYL/BUSYR) are inputs only-unlike the MASTER IDT7130-which internally inhibit writes during contention.
Arbitration relies on address-match detection: when both ports access the same location simultaneously, tAPS = 5 ns setup ensures deterministic priority resolution; tBDD = 55 ns defines delay from BUSY deassertion to valid read data on the non-contending port. No on-chip arbitration logic resides in the 7140SA55PF8-it depends entirely on external or MASTER-coordinated BUSY signaling.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), enabling compact dual-access buffer or FIFO implementation |
| Access Time | 55 ns max read cycle time (tRC), defining minimum clock period for synchronous interfacing |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V), compatible with legacy TTL and 5V microcontroller buses |
| Operating Temp | –40°C to +85°C (industrial grade), validated for embedded control and motor drive environments |
| Standby Current | 20 mA max (ISB1, TTL-level CE high), enabling low-power sleep modes in battery-backed systems |
| BUSY Role | BUSYL/BUSYR are dedicated inputs only-no internal generation-requiring pull-up and coordination with MASTER IDT7130 |
| Package | 48-pin ceramic flatpack (PF8), hermetically sealed for high-reliability aerospace and defense applications |
Pinout & Package
48-pin ceramic flatpack (PF8) with 0.75" × 0.75" body, side-brazed leads, and hermetic seal-designed for extended thermal cycling and high-reliability MIL-PRF-38535 QML compliance.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins required for noise suppression across dual-port operation |
| VCC (Pin 25) | Power supply | Single 5V supply powers both ports; all VCC pins must be decoupled locally |
| CEL / CER (Pins 3, 4) | Chip enable (left/right) | Active-low enables respective port; independent control allows interleaved access |
| OEL / OER (Pins 5, 6) | Output enable (left/right) | Active-low controls I/O drivers; high-Z state prevents bus contention during shared data paths |
| R/WL / R/WR (Pins 7, 8) | Read/write direction (left/right) | High = read, low = write; determines data flow direction per port independently |
| BUSYL / BUSYR (Pins 9, 10) | Arbitration input (left/right) | Inputs only-must be driven by MASTER IDT7130 or external logic to block writes during contention |
| INTL / INTR (Pins 11, 12) | Interrupt flag (left/right) | Open-drain outputs signal inter-port communication events; require external pull-ups |
| A0L–A9L / A0R–A9R (Pins 13–22, 33–42) | Address inputs (left/right) | 10-bit addressing per port; no internal latching-address must be stable before CE assertion |
| I/O0L–I/O7L / I/O0R–I/O7R (Pins 26–32, 43–48) | Data I/O (left/right) | Bidirectional 8-bit data buses; high-Z when OE high or CE high, eliminating need for external transceivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port asynchronous access | Enables simultaneous read/write from independent controllers (e.g., DSP + MCU) without clock domain synchronization |
| SLAVE-only BUSY interface | Eliminates need for external arbitration logic when used with IDT7130 MASTER-reduces BOM count and layout complexity |
| 55 ns guaranteed timing | Supports 18.2 MHz maximum burst transfer rate per port, suitable for real-time digital signal buffering |
| TTL-compatible voltage levels | Direct interface with legacy 5V microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
| Industrial temperature operation | Validated performance from –40°C to +85°C ensures reliability in motor drives, PLCs, and outdoor telecom equipment |
Applications
| Motor Control Buffer | DSP-MCU Shared Memory |
|---|---|
Use Scenario: Real-time PWM update and feedback capture in servo drives where FPGA updates control registers while MCU reads sensor data. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM provides non-blocking concurrent access-FPGA writes to left port while MCU reads right port at full 55 ns speed. Use Value: Eliminates software handshaking delays; guarantees deterministic 55 ns latency for closed-loop response under worst-case contention. | Use Scenario: High-speed data exchange between TI C6000 DSP and ARM Cortex-M7 in radar preprocessing, requiring zero-copy memory sharing. IC Role / Device Role / Timing Role: Acts as SLAVE in MASTER/SLAVE pair with IDT7130SA55PF8, enabling 16-bit-wide memory expansion without glue logic. Use Value: Sustains full 55 ns throughput across both ports-no cycle-stretching or wait states-even during simultaneous read/write to same address. |
| Avionics Data Logger | Industrial PLC I/O Mapping |
Use Scenario: Recording flight sensor streams (IMU, pressure, temp) while allowing ground-test system to read logged data via separate bus. IC Role / Device Role / Timing Role: Hermetic PF8 package withstands altitude-induced thermal stress; BUSY inputs coordinate safe read/write across dissimilar host interfaces. Use Value: MIL-PRF-38535 QML qualification ensures 10+ year field life; 55 ns access supports 18.2 MSPS sampling-to-log bandwidth. | Use Scenario: Mapping discrete I/O states between safety PLC and HMI controller in factory automation, requiring atomic read-modify-write cycles. IC Role / Device Role / Timing Role: SLAVE configuration allows PLC CPU to write status to left port while HMI reads mirrored image from right port with tBDD = 55 ns validity guarantee. Use Value: Prevents torn-reads during updates; INTL/INTR flags signal state changes without polling overhead. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352BV33-55AXI | 3.3V core, 55 ns, 1K × 16 organization, TQFP-100 package | Requires level translation for 5V systems; wider data bus reduces chip count but increases PCB area | Select when migrating to 3.3V architecture or needing 16-bit native width-verify BUSY arbitration compatibility with existing MASTER logic |
| IDT7132SA55PF8 | MASTER device with on-chip arbitration logic and BUSY outputs; identical 48-pin PF8 package and timing | Cannot operate standalone as SLAVE; requires redesign to use as MASTER in new systems | Choose only if replacing MASTER role or building new MASTER/SLAVE pair-pinout differs in BUSY/INT function allocation |
Compared with CY7C1352BV33-55AXI and IDT7132SA55PF8, the 7140SA55PF8 uniquely delivers 5V TTL compatibility, SLAVE-specific BUSY input behavior, and hermetic PF8 packaging-making it irreplaceable in legacy 5V industrial and aerospace designs requiring drop-in SLAVE replacement.
Availability
7140SA55PF8 is available at Aetrix Electronics and suitable for motor control buffers, DSP-MCU shared memory, avionics data loggers, and industrial PLC I/O mapping requiring stable component supply across extended product lifecycles.
Supply support for 7140SA55PF8 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 power management ICs, now part of Renesas Electronics.
The IDT7140SA/LA product line was designed specifically for high-reliability dual-port memory expansion in military, industrial, and commercial systems-emphasizing deterministic arbitration, 5V interoperability, and hermetic packaging.
FAQ
What is the exact function of BUSYL and BUSYR on the 7140SA55PF8?
BUSYL and BUSYR are dedicated input-only pins on the 7140SA55PF8. Unlike the MASTER IDT7130, this SLAVE device does not generate BUSY signals-it responds to them. When either BUSYL or BUSYR is driven LOW by the MASTER, writes to the corresponding port are internally inhibited. Both pins require external pull-up resistors and must be coordinated with IDT7130's open-drain BUSY outputs. This design eliminates need for external arbitration logic in MASTER/SLAVE configurations.
Can the 7140SA55PF8 operate as a standalone dual-port RAM without an IDT7130 MASTER?
No-the 7140SA55PF8 lacks on-chip arbitration logic and cannot resolve port contention autonomously. Its BUSY pins are inputs only, and it has no mechanism to assert BUSY or manage priority. Standalone operation would risk data corruption during simultaneous access. The 7140SA55PF8 is expressly designed to function exclusively as a SLAVE paired with IDT7130SA/LA in MASTER/SLAVE systems, as confirmed in the functional block diagram and truth tables.
What is the significance of the 'PF8' suffix in 7140SA55PF8?
The 'PF8' suffix denotes a 48-pin ceramic flatpack package with side-brazed leads and hermetic sealing. This package meets MIL-PRF-38535 QML requirements for high-reliability applications, offering superior thermal stability, moisture resistance, and long-term reliability compared to plastic DIP or LCC variants. It is specified in the Pin Configurations section and referenced in ordering information tables as the industrial/military-grade option.
Does the 7140SA55PF8 support battery backup data retention like the LA version?
No-the 'SA' in 7140SA55PF8 indicates Standard Active power grade, not Low-power Active (LA). Only LA versions (e.g., 7140LA55PF8) support 2V battery backup with data retention current ≤4000 µA. The 7140SA55PF8 has typical active power of 550 mW and standby current of 20 mA max-optimized for performance, not ultra-low-power retention. This distinction is explicitly stated in the Features and DC Electrical Characteristics sections.
How does interrupt handling work between ports on the 7140SA55PF8?
The 7140SA55PF8 uses open-drain INTL and INTR pins to signal inter-port events. Writing to address 3FFH on the left port sets the right-port INTR flag; writing to 3FEH on the right port sets the left-port INTL flag. These interrupts are cleared by reading the same addresses. Both flags require external pull-up resistors and generate asynchronous signals usable for DMA triggers or CPU wake-up-enabling efficient, hardware-driven communication without polling overhead in real-time systems using the 7140SA55PF8.
7140SA55PF8 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:
- 55ns
- Access Time:
- 55 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)
7140SA55PF8 FAQ
1.How can I place an order for 7140SA55PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140SA55PF8 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 7140SA55PF8 reliable?
The price and inventory of 7140SA55PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140SA55PF8 is usually 5 days.
3.What payment methods are accepted for 7140SA55PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140SA55PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140SA55PF8?
7140SA55PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140SA55PF8 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 7140SA55PF8?
For technical support, including 7140SA55PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140SA55PF8 requirements.
6.How does Aetrix verify that 7140SA55PF8 is sourced from the original manufacturer or authorized distributors?
All 7140SA55PF8 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 7140SA55PF8 meets industry standards.
7.What is the process for return or replacement of 7140SA55PF8?
All 7140SA55PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 7140SA55PF8, 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 7140SA55PF8 part is unused and in its original packaging.
Return procedure for 7140SA55PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140SA55PF8 Tags
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