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Renesas 7140LA55PF
- Part No.:
- 7140LA55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 64-LQFP
- Datasheet:
-
7140LA55PF.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 64TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,428
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Product details
Overview
7140LA55PF 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 cycle time, 1 µA typical full-standby current (CMOS-level CE), and battery-backed data retention at 2 V - deployed in real-time DSP co-processing and legacy industrial controller memory buffers.
For engineers reviewing the 7140LA55PF datasheet, 7140LA55PF pinout, 7140LA55PF application, or 7140LA55PF equivalent, key selection criteria include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7130 MASTER devices for 16-bit+ bus expansion, and flatpack package thermal/mechanical constraints in military-grade embedded systems.
Technical Context
The 7140LA55PF operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL/BUSYR) that must be driven by an external MASTER (e.g., IDT7130); it lacks internal arbitration logic and relies entirely on external BUSY signaling to prevent write contention. Its two independent ports support simultaneous read/write operations only when address non-matching is guaranteed or BUSY is externally managed.
It implements TTL-compatible 5 V ±10% single-supply operation, supports battery backup data retention at 2 V (LA variant only), and features CMOS-level standby control enabling 1 µA ISB3 current. The device requires pull-up resistors on open-drain BUSY inputs per datasheet Note 2.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 1K × 8 bits (1024 words × 8-bit wide), providing compact dual-access buffer for low-pin-count microcontrollers. |
| Access Time | 55 ns maximum read cycle time (tRC), enabling integration into 18 MHz synchronous bus interfaces with margin. |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V), compatible with legacy 5 V TTL/CMOS system rails without level translation. |
| Standby Current | 1 µA typical full-standby (ISB3, CMOS-level CE), critical for battery-backed operation in power-constrained field instruments. |
| Data Retention | 2.0 V minimum VCC for data retention (VDR), allowing backup from coin-cell or supercapacitor sources. |
| Operating Temp | –40°C to +85°C industrial range, validated for deployment in factory automation PLCs and motor drives. |
| Package | 48-pin ceramic flatpack (FP48), offering hermetic sealing and thermal stability for high-reliability military/industrial use. |
Pinout & Package
48-pin ceramic flatpack (FP48) with 0.75″ × 0.75″ body size and side-brazed leads; pin 1 index corner marked, all VCC pins require local decoupling, all GND pins must be connected to ground plane.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25) | Ground reference | Three dedicated ground pins ensure low-impedance return paths for both ports and reduce switching noise coupling. |
| VCC (Pins 23, 48) | Power supply | Dual VCC pins enable symmetric power distribution across die; each requires ≥0.1 µF ceramic decoupling. |
| CEL / CER | Chip enable (left/right) | Active-low enables independently disable each port's I/O drivers and reduce dynamic current draw. |
| OEL / OER | Output enable (left/right) | Active-low controls tri-state output drivers; allows shared bus usage without external bus transceivers. |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on I/O lines during active cycles. |
| BUSYL / BUSYR | BUSY input (left/right) | Active-low external arbitration signals - writes are internally inhibited when asserted; require pull-up resistors. |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs used for inter-port communication; require external pull-ups to generate interrupt events. |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses (0–1023) - no internal address latching; addresses must be stable before CE assertion. |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data buses - high-impedance when OE or CE inactive; support byte-wide memory mapping. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only architecture | Enables scalable 16-bit+ memory expansion when paired with IDT7130 MASTER, eliminating discrete glue logic in bus-width doubling designs. |
| 2 V data retention | Preserves memory contents during main power loss using low-voltage backup sources - verified at TA = +25°C, not production tested but guaranteed. |
| 55 ns access with low power | Delivers high-speed dual-port performance while maintaining just 110 mA typical ICC (both ports active), reducing thermal load in dense PCB layouts. |
| TTL-compatible 5 V interface | Direct connection to legacy microcontrollers, FPGAs, and ASICs without level-shifting circuitry - VIH = 2.2 V min, VIL = 0.8 V max. |
| Industrial temperature grade | Qualified from –40°C to +85°C, ensuring reliable operation in uncontrolled environments like factory floors and outdoor telecom cabinets. |
Applications
| Real-Time DSP Co-Processor Buffer | Legacy Industrial Controller Memory Expansion |
|---|---|
Use Scenario: Dual-port RAM shared between a TMS320C54x DSP (left port) and an ARM7 host (right port) for zero-wait-state data exchange during audio frame processing. IC Role / Device Role / Timing Role: SLAVE 7140LA55PF provides synchronized, contention-free memory access via external BUSY handshake from IDT7130 MASTER managing arbitration. Use Value: Eliminates software polling and hardware semaphore logic, reducing inter-processor latency to ≤55 ns while retaining data during brownout events. | Use Scenario: Memory upgrade in Allen-Bradley SLC 500 PLC backplane where 16-bit data path requires dual 8-bit SRAMs in MASTER/SLAVE configuration. IC Role / Device Role / Timing Role: 7140LA55PF acts as right-port SLAVE, accepting address/data from the backplane bus while receiving BUSY control from IDT7130 on the left. Use Value: Enables drop-in replacement of obsolete 2114-based modules with full-speed operation and extended temperature compliance for retrofit installations. |
| Military Avionics Data Logging Buffer | Redundant Sensor Fusion Node |
Use Scenario: Storing inertial measurement unit (IMU) samples in MIL-STD-1553B subsystems where power interruption risk demands nonvolatile retention. IC Role / Device Role / Timing Role: 7140LA55PF serves as battery-backed SLAVE buffer, holding last valid sensor snapshot during 2 V backup mode when main 5 V rail fails. Use Value: Guarantees 2 V data retention without external NVSRAM or EEPROM, simplifying BOM and meeting DO-254 design assurance requirements. | Use Scenario: Dual-sensor fusion node (GPS + INS) requiring concurrent read/write access to shared state vector memory across two independent MCU domains. IC Role / Device Role / Timing Role: 7140LA55PF operates as SLAVE under centralized arbitration, with BUSY inputs driven by FPGA-based priority encoder to resolve port conflicts. Use Value: Provides deterministic, hardware-enforced memory coherency without software locks - critical for Kalman filter update timing predictability. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C131-55PC | 5 V, 1K × 8, 55 ns, but uses separate BUSY output (not input); includes on-chip arbitration logic. | Self-contained arbitration eliminates need for external MASTER IC but increases pin count and layout complexity. | Select when standalone dual-port operation is required without MASTER/SLAVE pairing. |
| AS7C31025B-55PC | 5 V, 32K × 8, 55 ns, single-port architecture with internal address latches - no BUSY or INT signals. | Offers higher density but lacks true dual-port concurrency; requires external multiplexing for shared access. | Select when memory depth is prioritized over simultaneous access and arbitration simplicity is acceptable. |
Compared with CY7C131-55PC and AS7C31025B-55PC, the 7140LA55PF delivers lower standby power (1 µA vs. 5–10 µA) and guaranteed 2 V data retention, making it optimal for battery-backed, space-constrained SLAVE roles in established MASTER/SLAVE topologies.
Availability
7140LA55PF is available at Aetrix Electronics and suitable for real-time DSP co-processing, legacy industrial controller memory expansion, and military avionics data logging requiring stable component supply across extended product lifecycles.
Supply support for 7140LA55PF 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 signal-path solutions, now part of Renesas Electronics.
The IDT7140 product line was designed specifically for high-reliability dual-port memory expansion in military, industrial, and telecommunications systems where deterministic arbitration and battery backup are mandatory.
FAQ
What is the role of the 7140LA55PF in a MASTER/SLAVE dual-port SRAM system?
The 7140LA55PF functions exclusively as a SLAVE device - it accepts BUSY inputs (BUSYL/BUSYR) from an external MASTER (e.g., IDT7130) to inhibit writes during address contention and lacks on-chip arbitration logic. It cannot operate stand-alone as a MASTER and requires explicit external control of port access timing to ensure data integrity.
Does the 7140LA55PF support battery backup, and what voltage is required?
Yes, the 7140LA55PF supports battery backup data retention at 2.0 V minimum (VDR), verified per datasheet Table 7. This applies only to LA variants (not SA). At VCC = 2.0 V and TA = +25°C, data is retained with ICCDR ≤ 4000 µA (military/industrial grade), enabling use with coin cells or supercapacitors during main power loss.
What is the significance of BUSYL and BUSYR being inputs on the 7140LA55PF?
On the 7140LA55PF, BUSYL and BUSYR are active-low inputs - unlike the IDT7130 MASTER which drives them as open-drain outputs. When asserted (LOW), they internally inhibit writes to the respective port regardless of R/W or CE state. External pull-up resistors are mandatory per datasheet Note 2 to ensure proper deassertion.
Can the 7140LA55PF be used without an IDT7130 MASTER device?
No - the 7140LA55PF has no internal arbitration logic and depends entirely on externally generated BUSY signals to prevent write collisions. In non-MASTER/SLAVE configurations, deterministic access must be enforced by external logic (e.g., FPGA or CPLD) driving BUSYL/BUSYR, or strict software coordination with non-overlapping address spaces.
What package type does the 7140LA55PF use, and what are its mechanical characteristics?
The 7140LA55PF uses a 48-pin ceramic flatpack (FP48) with approximate dimensions of 0.75″ × 0.75″ × 0.11″. It features side-brazed leads, hermetic sealing, and is qualified for military-grade reliability. Pin 1 is indexed at the corner; all VCC and GND pins must be properly decoupled and grounded per datasheet Notes 1–2.
7140LA55PF 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:
- 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)
7140LA55PF FAQ
1.How can I place an order for 7140LA55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA55PF 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 7140LA55PF reliable?
The price and inventory of 7140LA55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA55PF is usually 5 days.
3.What payment methods are accepted for 7140LA55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA55PF?
7140LA55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA55PF 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 7140LA55PF?
For technical support, including 7140LA55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA55PF requirements.
6.How does Aetrix verify that 7140LA55PF is sourced from the original manufacturer or authorized distributors?
All 7140LA55PF 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 7140LA55PF meets industry standards.
7.What is the process for return or replacement of 7140LA55PF?
All 7140LA55PF units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA55PF, 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 7140LA55PF part is unused and in its original packaging.
Return procedure for 7140LA55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA55PF Tags
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