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Renesas 7140LA100PDG
- Part No.:
- 7140LA100PDG
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7140LA100PDG.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 48DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,848
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Product details
Overview
7140LA100PDG 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 100 ns maximum read/write cycle time, 1 mA typical standby current (LA version), and battery-backed data retention down to 2 V. It enables error-free 16-bit-or-wider memory systems without external arbitration logic.
For engineers reviewing the 7140LA100PDG datasheet, 7140LA100PDG pinout, 7140LA100PDG application, or 7140LA100PDG equivalent, key selection criteria include its role as SLAVE in master/slave dual-port configurations, BUSY input behavior (not output), 48-pin PDIP package, industrial temperature range (–40°C to +85°C), and compatibility with IDT7130LA/SA master devices.
Technical Context
The 7140LA100PDG operates as a SLAVE dual-port SRAM with dedicated BUSY inputs (BUSYL, BUSYR) that inhibit writes when asserted low - unlike the MASTER IDT7130 which drives BUSY outputs. Its arbitration logic responds only to address match detection and requires tAPS ≥5 ns setup for deterministic priority resolution.
It supports independent TTL-compatible 5 V ±10% operation on both ports, features automatic power-down via CE control, and implements battery backup data retention at 2 V (ICCDR ≤1500 µA typical, commercial grade), with full CMOS-level standby modes enabling ISB3 ≤0.2 mA.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), dual independent ports |
| Max Read/Write Cycle Time | 100 ns - defines minimum clock period for synchronous interface designs |
| Standby Current (ISB3) | 0.2 mA typical - enables ultra-low-power hold mode with CMOS-level CE |
| Data Retention Voltage | 2.0 V - allows backup from coin cell or supercapacitor during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and communications equipment |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard 5 V TTL logic rails and noise margins |
| Package | 48-pin plastic DIP (PDG48) - through-hole mounting, 0.600" width, RoHS-compliant |
Pinout & Package
48-pin plastic dual in-line package (PDG48), 0.600" wide, with 0.100" lead pitch. Pin 1 index located at top-left corner (notch side).
| 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 high-speed dual-port operation |
| VCC (Pins 23, 26) | Power supply | Dual VCC pins ensure stable core voltage delivery under fast switching transients on both ports |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; controls dynamic current (ICC) and entry into ISB1–ISB4 standby modes |
| OEL / OER | Output enable (left/right) | Active-low tri-states I/O bus; required for bus sharing in multi-device systems |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on I/O lines |
| BUSYL / BUSYR | Busy input (left/right) | SLAVE-only function: low = write inhibited; must be driven by MASTER's open-drain BUSY outputs with pull-up |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs signal inter-port events (e.g., flag set/clear at address 3FEh/3FFh) |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses select one of 1024 locations per port; no internal latching |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; high-impedance when OE = high or CE = high |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY input architecture | Eliminates need for external arbitration logic when paired with IDT7130 MASTER, reducing BOM count and PCB area |
| 2 V data retention (LA version) | Enables seamless transition to battery backup mode without data loss during AC power interruption |
| 100 ns max access with full 5 V TTL compatibility | Supports legacy microcontroller and DSP interfaces without level-shifting or timing margin compromises |
| Four standby current modes (ISB1–ISB4) | Allows fine-grained power optimization: e.g., ISB3 = 0.2 mA with CMOS-level CE for deep sleep |
| Industrial temperature qualification | Validated operation from –40°C to +85°C ensures reliability in motor drives, base stations, and industrial PLCs |
Applications
| Motor Control Encoder Buffer | Industrial PLC Dual-Port Memory |
|---|---|
Use Scenario: Real-time capture of quadrature encoder pulses while simultaneously servicing HMI or supervisory CPU reads. IC Role / Device Role / Timing Role: SLAVE dual-port SRAM buffers position data between high-speed encoder interface (left port) and slower control processor (right port), using BUSY-driven arbitration. Use Value: Eliminates FIFO overflow risk and eliminates need for software polling or external semaphores due to hardware-enforced atomic access. | Use Scenario: Shared memory between safety-critical logic solver and diagnostics subsystem in modular PLC backplane. IC Role / Device Role / Timing Role: SLAVE device in MASTER/SLAVE pair stores I/O image data; left port serves logic solver, right port serves diagnostics engine with interrupt signaling. Use Value: Enables deterministic, lock-free inter-processor communication with <50 ns port-to-port delay (tDDD ≤35 ns @100 ns grade). |
| Telecom Line Card Buffer | Avionics Data Recorder Interface |
Use Scenario: Simultaneous packet header buffering (FPGA port) and host CPU access (microcontroller port) in T1/E1 line cards. IC Role / Device Role / Timing Role: SLAVE device synchronized to IDT7130 MASTER; left port handles FPGA DMA bursts, right port supports ARM Cortex-M4 register-mapped reads. Use Value: Achieves full 100 ns throughput on both ports without pipeline stalls or external wait-state generation. | Use Scenario: Non-volatile session buffer between flight sensor acquisition ASIC and ARINC 429 protocol processor during power brownouts. IC Role / Device Role / Timing Role: LA-version SLAVE SRAM retains critical last-flight parameters at 2 V using onboard supercapacitor backup. Use Value: Guarantees >100 ms data retention at 2 V (ICCDR ≤1500 µA), meeting DO-160 Section 22 transient requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1352BV-100AXC | 1K × 16 organization, 100 ns, 3.3 V core (5 V tolerant I/O), no built-in BUSY arbitration | Requires external logic for port contention handling; suited for wider data paths but not drop-in MASTER/SLAVE replacement | Select if migrating to 3.3 V system or requiring 16-bit word width; verify external arbitration design. |
| IDT7132LA100PDG | 2K × 8, same LA retention and 100 ns speed, but MASTER device with BUSY outputs and on-chip arbitration | Cannot serve as SLAVE; used as standalone or MASTER in 16-bit expansion - incompatible pinout and BUSY direction | Choose only when redesigning as MASTER node; not interchangeable with 7140LA100PDG due to BUSY I/O reversal and pin mapping. |
Compared with CY7C1352BV-100AXC and IDT7132LA100PDG, the 7140LA100PDG uniquely provides SLAVE-specific BUSY input behavior and pin-compatible integration with IDT7130-based systems - enabling zero-additional-logic memory expansion where deterministic arbitration and 5 V TTL compatibility are mandatory.
Availability
7140LA100PDG is available at Aetrix Electronics and suitable for industrial automation, avionics data logging, and telecom line card designs requiring stable component supply, long-term lifecycle support, and guaranteed industrial temperature performance.
Supply support for 7140LA100PDG 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 IDT7130/7140 family was designed specifically for high-reliability dual-ported memory expansion in real-time control systems, emphasizing hardware arbitration, low-power retention, and seamless 5 V TTL interoperability.
FAQ
What is the function of BUSYL and BUSYR on the 7140LA100PDG?
BUSYL and BUSYR are dedicated input pins on the 7140LA100PDG - unlike the MASTER IDT7130, which drives them as open-drain outputs. When either BUSYL or BUSYR is pulled low (typically by the IDT7130 MASTER's corresponding BUSY output), writes to the respective port are internally inhibited. This enables hardware-controlled arbitration without external logic. The 7140LA100PDG does not drive BUSY signals.
Does the 7140LA100PDG support battery backup operation?
Yes, the 7140LA100PDG supports battery backup data retention at 2.0 V (VDR), with typical ICCDR ≤1500 µA in commercial grade. This feature is exclusive to LA versions and allows nonvolatile storage during main power loss. The 7140LA100PDG enters data retention mode automatically when VCC drops below 2.0 V while CE remains asserted, preserving contents for extended periods.
Can the 7140LA100PDG operate as a standalone dual-port RAM?
No - the 7140LA100PDG is explicitly designed as a SLAVE device and lacks on-chip arbitration logic required for autonomous operation. It depends on an external MASTER (e.g., IDT7130LA/SA) to resolve port contention via BUSY signaling. Attempting standalone use results in undefined write behavior during address collisions; the 7140LA100PDG must be paired with a compatible MASTER in all functional implementations.
What is the meaning of "PDG" in the 7140LA100PDG part number?
"PDG" denotes the 48-pin plastic dual in-line package (PDIP) variant with 0.600" body width and standard through-hole leads. It is distinct from other packages like LC48 (LCC), FP48 (flatpack), PLG52 (PLCC), or PPG64/PNG64 (TQFP/STQFP). The 7140LA100PDG uses this PDG48 package, confirmed in the pin configuration diagrams and mechanical notes specifying "PDG48 package body is approximately .55 in x .61 in x .19 in".
How does interrupt generation work on the 7140LA100PDG?
The 7140LA100PDG supports port-to-port interrupt signaling via INTL and INTR open-drain outputs. Writing to specific addresses (e.g., A0L–A9L = 3FEh sets INTL; A0R–A9R = 3FFh sets INTR) asserts the corresponding flag. Clearing is performed by writing to complementary addresses (3FFh clears INTL; 3FEh clears INTR). Interrupt timing is characterized with tINS ≤25 ns (max) for the 100 ns grade, enabling sub-cycle notification between processors.
7140LA100PDG Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-DIP (0.600", 15.24mm)
- 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:
- 100ns
- Access Time:
- 100 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-PDIP
7140LA100PDG FAQ
1.How can I place an order for 7140LA100PDG through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA100PDG 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 7140LA100PDG reliable?
The price and inventory of 7140LA100PDG are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA100PDG is usually 5 days.
3.What payment methods are accepted for 7140LA100PDG?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA100PDG transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA100PDG?
7140LA100PDG orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA100PDG 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 7140LA100PDG?
For technical support, including 7140LA100PDG datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA100PDG requirements.
6.How does Aetrix verify that 7140LA100PDG is sourced from the original manufacturer or authorized distributors?
All 7140LA100PDG 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 7140LA100PDG meets industry standards.
7.What is the process for return or replacement of 7140LA100PDG?
All 7140LA100PDG units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA100PDG, 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 7140LA100PDG part is unused and in its original packaging.
Return procedure for 7140LA100PDG:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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