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Renesas 7140LA100J
- Part No.:
- 7140LA100J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7140LA100J.pdf
- Description:
- IC SRAM 8KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:4,317
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Product details
Overview
7140LA100J 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 100ns max read/write 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 IDT7130 master.
For engineers reviewing the 7140LA100J datasheet, 7140LA100J pinout, 7140LA100J application, or 7140LA100J equivalent, key selection considerations include BUSY input behavior (not output), battery-backed data retention at 2V, low 1µA full-standby current, and compatibility with 48-pin DIP/LCC/Flatpack, 52-pin PLCC, and 64-pin TQFP/STQFP packages.
Technical Context
The 7140LA100J operates as a SLAVE dual-port SRAM with dedicated BUSY input pins (BUSYL, BUSYR) that inhibit writes when asserted low-unlike the MASTER IDT7130 which drives BUSY outputs. Its arbitration logic responds only to address match and CE timing, requiring tAPS ≥5ns setup for deterministic priority resolution.
It supports R/W-controlled and CE-controlled write cycles, with tWP = 55ns min and tWC = 100ns max; data retention is guaranteed at VCC = 2.0V with ICCDR ≤4000µA (military/industrial) and ≤1500µA (commercial), enabling battery backup operation without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 1K × 8 (1024 words × 8 bits), two independent asynchronous ports |
| Access Time (max) | 100ns - defines minimum read cycle time tRC; determines maximum sustained throughput in real-time systems |
| Supply Voltage | 4.5V to 5.5V - TTL-compatible single 5V rail; no separate I/O or core voltage required |
| Standby Current (ISB3) | 0.2µA typical - ultra-low full-standby power when both CE inputs held high-impedance or at rail extremes |
| Data Retention Voltage | 2.0V - enables direct connection to backup battery; retains data without active regulation |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and factory automation |
| Package Options | 48-pin DIP, LCC, Flatpack; 52-pin PLCC; 64-pin TQFP/STQFP - supports legacy through-hole and modern surface-mount assembly |
Pinout & Package
7140LA100J is available in multiple industry-standard packages including 48-pin DIP (PDG48/SB48), 48-pin LCC (LC48), 48-pin Ceramic Flatpack (FP48), 52-pin PLCC (PLG52), and 64-pin TQFP/STQFP (PPG64/PNG64). The J suffix denotes ceramic flatpack (FP48) package per IDT ordering conventions.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 25, 48) | Ground reference | All four GND pins must be connected to system ground plane for stable noise margin and thermal dissipation |
| VCC (Pins 23, 26) | Power supply | Both VCC pins require local 0.1µF ceramic decoupling; shared 5V rail powers both ports simultaneously |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; CE high places port in standby (ISB1/ISB2 mode) |
| OEL / OER | Output enable (left/right) | Active-low controls I/O bus drivers; OE high forces I/O pins to high-impedance state |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; determines direction of data flow on I/O lines during active CE |
| BUSYL / BUSYR | Busy input (left/right) | Slave-only function: low level inhibits writes to corresponding port; requires pull-up resistor externally |
| INTL / INTR | Interrupt flag (left/right) | Open-drain outputs; used for inter-port signaling (e.g., set/reset flags via address 3FEh/3FFh) |
| A0L–A9L / A0R–A9R | Address inputs (left/right) | 10-bit address buses select one of 1024 locations per port; no internal address latching |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data buses; driven by internal CMOS drivers with 0.4V VOL @ 4mA |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY input architecture | Eliminates need for external arbitration logic when cascading with IDT7130 master; BUSYX pins directly gate write paths |
| 2V data retention | Enables seamless battery backup without external regulators or supervisors; retains contents during main power loss |
| 0.2µA full-standby current (ISB3) | Reduces system-level standby power by >95% vs. SA variants; critical for always-on industrial controllers |
| 100ns max access with 55ns write pulse | Supports deterministic real-time response in motion control and digital signal buffering applications |
| TTL-compatible 5V interface | Direct interfacing with legacy microcontrollers, FPGAs, and ASICs without level-shifting circuitry |
Applications
| Motor Control Buffering | Digital Signal Processing |
|---|---|
|
Use Scenario: Real-time exchange of position commands and feedback between FPGA-based motion controller and DSP co-processor. IC Role / Device Role / Timing Role: Slave dual-port SRAM provides non-blocking, simultaneous read/write access for command queue and status register updates. Use Value: Eliminates handshake overhead and ensures deterministic latency ≤100ns for closed-loop servo updates. |
Use Scenario: Storing filter coefficients and intermediate FFT results in radar baseband processing. IC Role / Device Role / Timing Role: Left port accepts new coefficients from ARM host; right port streams data to DSP engine at full bandwidth. Use Value: Enables pipelined execution without DMA stalls; 1K × 8 depth matches common FIR tap counts. |
| Industrial PLC I/O Mapping | Legacy System Memory Expansion |
|
Use Scenario: Mapping discrete I/O states across redundant CPU modules in safety-critical programmable logic controllers. IC Role / Device Role / Timing Role: Acts as shared memory buffer with BUSY-driven contention resolution between primary and backup CPUs. Use Value: Guarantees atomic updates via hardware arbitration; prevents race conditions during hot-switchover. |
Use Scenario: Expanding data bus width from 8-bit to 16-bit in retrofitted instrumentation using Z80 or 8085 derivatives. IC Role / Device Role / Timing Role: Paired with IDT7130 master to form 16-bit word-wide memory without glue logic or wait-state insertion. Use Value: Maintains original system timing while doubling effective throughput; drop-in replacement for obsolete 2114-style SRAMs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C135-100JC | 1K × 8, 100ns, 5V, but uses separate BUSY output (not input); no battery retention; only 44-pin PLCC package | Requires external arbitration logic for multi-port systems; unsuitable for battery-backed designs | Select only if existing design already implements external BUSY-handling logic and does not require 2V retention |
| AS7C31025B-100JC | 1M × 8, 100ns, 3.3V core; no dual-port arbitration; no BUSY/INT signals; standard single-port interface | Cannot replace 7140LA100J in MASTER/SLAVE configurations; lacks port-to-port communication features | Consider only for greenfield designs where dual-port functionality is unnecessary and 3.3V supply is mandated |
Compared with CY7C135-100JC and AS7C31025B-100JC, the 7140LA100J uniquely delivers slave-side BUSY input behavior, 2V data retention, and industrial temperature support in a pin-compatible FP48 ceramic package-enabling robust, low-power, and legacy-compatible dual-port memory expansion.
Availability
7140LA100J is available at Aetrix Electronics and suitable for motor control buffering, digital signal processing, industrial PLC I/O mapping, and legacy system memory expansion requiring stable component supply across extended product lifecycles.
Supply support for 7140LA100J 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, and RF solutions, now part of Renesas Electronics.
The IDT7140 family was designed specifically for high-reliability dual-port memory expansion in industrial and military systems, emphasizing deterministic arbitration, low-power standby, and seamless MASTER/SLAVE interoperability.
FAQ
What is the role of BUSY pins on the 7140LA100J?
The 7140LA100J uses BUSYL and BUSYR exclusively as inputs-not outputs-to receive arbitration signals from a MASTER IDT7130. When either BUSY pin is driven low, writes to the corresponding port are internally inhibited. This eliminates the need for external logic to resolve port contention, making the 7140LA100J a true slave device in dual-port memory systems.
Does the 7140LA100J support battery backup operation?
Yes, the 7140LA100J supports battery backup operation with guaranteed data retention at VCC = 2.0V. In this mode, it draws ≤4000µA (military/industrial grade) or ≤1500µA (commercial grade), enabling direct connection to a coin-cell battery without regulation. This feature is exclusive to LA-series parts and is not available in SA variants.
Which packages are available for the 7140LA100J?
The 7140LA100J is offered in multiple packages: 48-pin DIP (PDG48/SB48), 48-pin LCC (LC48), 48-pin Ceramic Flatpack (FP48), 52-pin PLCC (PLG52), and 64-pin TQFP/STQFP (PPG64/PNG64). The "J" suffix in 7140LA100J specifically denotes the 48-pin Ceramic Flatpack (FP48) variant, confirmed by IDT's ordering guide and package drawings.
How does the 7140LA100J differ from the IDT7130 master device?
The 7140LA100J functions solely as a SLAVE: it accepts BUSY inputs but does not generate them, lacks on-chip arbitration logic, and cannot operate stand-alone as an 8-bit dual-port RAM. In contrast, the IDT7130 is a MASTER with BUSY outputs, internal arbitration, and full stand-alone capability. They are complementary-not interchangeable-and must be used together for 16-bit expansion.
What is the minimum write pulse width (tWP) for the 7140LA100J at 100ns speed grade?
For the 7140LA100J, the minimum write pulse width tWP is 55ns, as specified in Table 10b of the datasheet. This parameter applies under R/W-controlled write cycles and ensures reliable data capture into the SRAM array. Shorter pulses risk write failures, especially under worst-case voltage and temperature conditions.
7140LA100J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- 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:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7140LA100J FAQ
1.How can I place an order for 7140LA100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7140LA100J 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 7140LA100J reliable?
The price and inventory of 7140LA100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7140LA100J is usually 5 days.
3.What payment methods are accepted for 7140LA100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7140LA100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7140LA100J?
7140LA100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7140LA100J 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 7140LA100J?
For technical support, including 7140LA100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7140LA100J requirements.
6.How does Aetrix verify that 7140LA100J is sourced from the original manufacturer or authorized distributors?
All 7140LA100J 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 7140LA100J meets industry standards.
7.What is the process for return or replacement of 7140LA100J?
All 7140LA100J units undergo pre-shipment inspection (PSI). If there is an issue with 7140LA100J, 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 7140LA100J part is unused and in its original packaging.
Return procedure for 7140LA100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7140LA100J Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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