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Renesas 7142LA100J
- Part No.:
- 7142LA100J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA100J.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,020
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Product details
Overview
IDT7142LA100J from Integrated Device Technology (IDT) is a 2K × 8 dual-port static RAM configured as a slave device in master/slave memory expansion systems, supporting independent asynchronous read/write access on left and right ports with 100 ns maximum read cycle time, 5 V ±10% TTL-compatible supply, and industrial temperature range (–40°C to +85°C). It enables 16-bit-or-wider word-width memory systems without external logic.
For engineers reviewing the IDT7142LA100J datasheet, IDT7142LA100J pinout, IDT7142LA100J application, or IDT7142LA100J equivalent, key selection considerations include its BUSY input role (vs. master's BUSY output), battery-backed data retention at 2 V, ultra-low 1 µA full-standby current (ISB3), and compatibility with 48-pin DIP/LCC/Flatpack and 52-pin PLCC packages.
Technical Context
The IDT7142LA100J implements a true dual-port SRAM architecture with fully independent address, control, and I/O buses per port - no internal arbitration logic - relying instead on external BUSY signaling from a companion IDT7132 master for contention resolution. Its BUSY pin functions solely as an input to inhibit writes during address collision.
It supports two distinct power-down modes: TTL-level standby (ISB1/ISB2) and CMOS-level full-standby (ISB3/ISB4), achieving 1 µA typical current when both chip enables are held high and all inputs are at rail. Data retention at 2 V is guaranteed for LA variants, enabling battery backup operation without external circuitry.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 = 16,384 bits; supports byte-wide independent access on two ports |
| Max Read Cycle Time (tRC) | 100 ns - defines minimum interval between successive reads on same port |
| Supply Voltage | 5.0 V ±10% - single-rail TTL-compatible operation; no separate VDD/VSS sequencing required |
| Full Standby Current (ISB3) | 1 µA typ. - achieved when both CE pins > VCC − 0.2 V and all inputs at rail; enables battery backup |
| Data Retention Voltage | 2.0 V min. - maintains stored data indefinitely with external 2 V battery; LA-specific feature |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments; not rated for military or commercial-only grades |
| Input Leakage (|ILI|) | 5 µA max. - ensures low power consumption and stable logic levels during standby |
Pinout & Package
Available in 48-pin PDIP, LCC, Flatpack, and 52-pin PLCC packages. Pin functions are identical across packages; physical layout differs per mechanical drawing.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls port power-down (ISB1/ISB2/ISB3/ISB4) |
| OEL / OER | Output Enable (Left / Right) | Active-low control of I/O drivers; places outputs in high-Z when deasserted |
| R/WL / R/WR | Read/Write Control (Left / Right) | High = read, Low = write; determines direction of data flow on I/O bus |
| BUSYL / BUSYR | BUSY Input (Left / Right) | Active-low signal from IDT7132 master; gates internal write path when asserted |
| A0L–A10L / A0R–A10R | Address Inputs (Left / Right) | 11-bit address per port; selects one of 2K locations independently |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O Bus (Left / Right) | Bidirectional 8-bit data path; driven by port logic only when enabled |
| VCC / GND | Power Supply | Single 5 V supply; all VCC pins must be connected; all GND pins tied to common ground |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY interface | Accepts BUSY signal from IDT7132 master to block concurrent writes - eliminates need for external arbitration logic |
| 2 V data retention | Preserves memory contents during main power loss using standard 2 V backup battery - no external regulator needed |
| Ultra-low ISB3 current | 1 µA typical full-standby current enables multi-year battery life in backup mode |
| Independent port control | Each port has dedicated CE, OE, R/W, address, and I/O - enables true asynchronous dual-access without software coordination |
| TTL-compatible I/O | Direct interface with 5 V microcontrollers, FPGAs, and ASICs - no level-shifting required |
Applications
| Real-Time Digital Signal Processing | Industrial Motion Controller Memory |
|---|---|
|
Use Scenario: Simultaneous acquisition of sensor data on one port while executing control algorithms on the other port in a closed-loop servo system. IC Role / Device Role / Timing Role: Slave memory buffer enabling zero-latency inter-port data handoff via BUSY-synchronized writes. Use Value: Eliminates CPU polling or interrupt overhead by guaranteeing atomic write completion before read access - critical for jitter-sensitive motion profiles. |
Use Scenario: Storing calibrated motor parameters and real-time position history in a programmable logic controller with separate HMI and PLC execution domains. IC Role / Device Role / Timing Role: Dual-port SRAM acting as shared memory between isolated firmware partitions, with BUSY preventing parameter corruption during updates. Use Value: Enables deterministic parameter update cycles without halting motion execution - preserves safety-critical timing integrity. |
| Avionics Display Frame Buffer | Test Equipment Pattern Generator |
|
Use Scenario: Rendering graphics frames on one port while the display engine reads completed frames on the other port in a DO-254-compliant cockpit display unit. IC Role / Device Role / Timing Role: Slave memory synchronized to IDT7132 master for seamless frame swapping under BUSY arbitration. Use Value: Guarantees flicker-free rendering by preventing partial-frame reads during pixel buffer updates - meets MIL-STD-810G video stability requirements. |
Use Scenario: Storing high-speed digital test patterns in automated test equipment where pattern generation and waveform capture occur concurrently. IC Role / Device Role / Timing Role: Dual-port RAM serving as pattern store (write port) and stimulus source (read port), coordinated via external BUSY handshake. Use Value: Supports >10 MHz pattern rates without FIFO bottlenecks - achieves sub-100 ns timing resolution in boundary-scan validation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| Cypress CY7C1371DV33-100AXC | 3.3 V core, 100 ns access, 2K × 16 organization; no BUSY arbitration; requires external logic for contention handling | Designed for low-voltage embedded systems; lacks native master/slave expansion capability | Select when migrating to 3.3 V systems and adding custom arbitration; not drop-in compatible |
| ISSI IS61LV25616AL-10TLI | 3.3 V supply, 256K × 16, no BUSY pin; asynchronous dual-port with separate clocks per port | Higher density for complex buffering; no hardware contention resolution - relies on software synchronization | Choose for larger memory needs in non-real-time applications where BUSY arbitration is unnecessary |
Compared with CY7C1371DV33-100AXC and IS61LV25616AL-10TLI, the IDT7142LA100J uniquely provides native 5 V BUSY-input slave functionality for deterministic contention resolution in master/slave configurations - essential for hard real-time systems requiring guaranteed atomicity without software intervention.
Availability
IDT7142LA100J is available at Aetrix Electronics and suitable for industrial motion controllers, avionics display subsystems, and automated test equipment requiring stable component supply, long-term lifecycle support, and guaranteed 2 V data retention capability.
Supply support for IDT7142LA100J 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs, later acquired by Renesas Electronics in 2019.
The IDT7132/7142 family was designed specifically for high-reliability dual-access memory applications requiring hardware-arbitrated concurrency - targeting military, industrial, and telecom infrastructure where deterministic timing and data integrity are non-negotiable.
FAQ
What is the primary functional distinction between IDT7142LA100J and IDT7132LA100J?
IDT7142LA100J is a slave-only dual-port SRAM with BUSY pins configured as inputs to accept arbitration signals from a master IDT7132LA100J, whereas IDT7132LA100J contains on-chip arbitration logic and drives BUSY as an open-drain output. The IDT7142LA100J cannot operate standalone in contention-prone systems - it requires a master for BUSY-based write inhibition.
Does IDT7142LA100J support battery backup, and what voltage is required?
Yes, IDT7142LA100J supports battery backup with guaranteed data retention at 2.0 V minimum supply voltage. This is a defining feature of the "LA" suffix variant. The device draws only 100 µA typical during retention mode (ICCDR), enabling multi-year operation from a standard CR2032 coin cell when paired with appropriate power-switching circuitry.
Which packages are available for IDT7142LA100J, and are pinouts identical?
IDT7142LA100J is offered in 48-pin PDIP, 48-pin LCC, 48-pin Flatpack, and 52-pin PLCC packages. Pin functions are electrically identical across all packages; however, pin numbering and physical layout differ - refer to Figures 3–4 in the datasheet for package-specific diagrams. No pin mapping conversion is needed for logic design.
What is the significance of ISB3 = 1 µA typical for IDT7142LA100J?
ISB3 = 1 µA typical represents the full-standby current when both chip enables (CEL and CER) are held high (> VCC − 0.2 V) and all inputs are at valid logic rails. This ultra-low current enables true battery-backed retention mode - critical for applications requiring memory persistence during main power failure without significant battery drain.
Can IDT7142LA100J be used without a master IDT7132 in non-contention applications?
Yes, IDT7142LA100J can operate without a master if address collisions between ports are guaranteed never to occur - for example, in fixed-partition memory systems where left and right ports access disjoint address ranges. In such cases, BUSYL and BUSYR pins must be pulled high (via 270 Ω resistors) to prevent unintended write inhibition, as they default to active-low inputs.
7142LA100J 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:
- 16Kbit
- Memory Organization:
- 2K 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)
7142LA100J FAQ
1.How can I place an order for 7142LA100J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA100J 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 7142LA100J reliable?
The price and inventory of 7142LA100J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA100J is usually 5 days.
3.What payment methods are accepted for 7142LA100J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA100J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA100J?
7142LA100J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA100J 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 7142LA100J?
For technical support, including 7142LA100J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA100J requirements.
6.How does Aetrix verify that 7142LA100J is sourced from the original manufacturer or authorized distributors?
All 7142LA100J 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 7142LA100J meets industry standards.
7.What is the process for return or replacement of 7142LA100J?
All 7142LA100J units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA100J, 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 7142LA100J part is unused and in its original packaging.
Return procedure for 7142LA100J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA100J Tags
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