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Renesas 7142LA25JI
- Part No.:
- 7142LA25JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142LA25JI.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,943
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Product details
Overview
7142LA25JI from 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, 25 ns maximum read cycle time (tRC), 1 μA full-standby current (ISB3), battery-backed data retention at 2 V, and industrial temperature operation (–40°C to +85°C) - used in real-time avionics bus arbitration buffers and redundant controller memory interfaces.
For engineers reviewing the 7142LA25JI datasheet, 7142LA25JI pinout, 7142LA25JI application, or 7142LA25JI equivalent, this page delivers verified electrical timing (tAA ≤ 25 ns, tWP ≤ 15 ns), BUSY input behavior, LA-series low-power validation, FP48 flatpack mechanical data, and direct alternative part comparisons for dual-port SRAM selection in safety-critical embedded systems.
Technical Context
The 7142LA25JI operates exclusively as a slave device: its BUSYL and BUSYR pins are dedicated inputs that gate write operations when asserted low by a master IDT7132, enabling hardware-controlled port arbitration without external logic. It lacks on-chip arbitration logic - all BUSY-driven contention resolution is externally coordinated via the master's open-drain BUSY outputs.
It supports two independent TTL-compatible 5 V ±10% ports with separate CE, OE, R/W, address (A0–A10), and bidirectional I/O (I/O0–I/O7) signals per side; power management is implemented via CE-controlled standby modes yielding ISB3 = 0.2 mA (typ.) at CMOS-level inputs and ICC = 110 mA (typ.) during active dual-port operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), non-volatile only under 2 V battery backup |
| Read Cycle Time (tRC) | 25 ns max - defines minimum interval between successive reads on same port |
| Write Pulse Width (tWP) | 15 ns min - minimum duration R/W must remain low during CE-controlled write |
| Full Standby Current (ISB3) | 0.2 mA typ. - achieved when both CEs > VCC − 0.2 V and all inputs at rail extremes |
| Data Retention Voltage | 2.0 V min - maintains stored data with no functional operation, exclusive to LA version |
| Operating Temperature | –40°C to +85°C - validated for industrial-grade reliability in extended-environment systems |
| Supply Voltage | 4.5 V to 5.5 V - TTL-compatible single 5 V supply with ±10% tolerance |
Pinout & Package
7142LA25JI is packaged in a 48-pin flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height, featuring dual-row gull-wing leads, hermetically sealed ceramic body, and explicit GND/VCC pin assignments per side for noise isolation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Separate ground connections for left/right port domains reduce crosstalk-induced timing skew |
| VCC (Pin 25) | Power supply | Single 5 V supply powers both ports; all VCC pins must be connected per datasheet note |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives ISB1/ISB2/ISB3 standby states based on input level |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; high-Z state entered within tHZ ≤ 10 ns (25 ns max for 55/100 ns versions) |
| R/WL / R/WR | Read/write control (left/right) | Low = write, high = read; determines direction of I/O0–I/O7 data flow per port |
| BUSYL / BUSYR | BUSY input (slave-only) | Asynchronous write-inhibit signal - internal write gating occurs immediately on low assertion |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address space selects one of 2048 locations; no internal latching - valid before CE/OE setup |
| I/O0L–I/O7L / I/O0R–I/O7R | Bidirectional data (left/right) | CMOS-compatible 8-bit data bus; driven low/high during writes, tri-stated during reads or disable |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY interface | Eliminates need for external AND/OR logic in width-expanded arrays - BUSY inputs directly inhibit writes |
| 2 V data retention | Enables seamless switchover to backup battery during main supply loss, preserving critical state in flight control buffers |
| Independent port power gating | CE-driven standby allows one port active while other consumes only 0.2 mA - ideal for asymmetric traffic patterns |
| TTL-compatible 5 V operation | Direct interfacing with legacy microcontrollers and FPGAs without level-shifting circuitry |
| Industrial temperature range | Validated operation from –40°C to +85°C ensures reliability in engine-mounted or chassis-mounted electronics |
Applications
| Avionics Data Buffering | Redundant Controller Memory |
|---|---|
Use Scenario: Dual-channel ARINC 429 receiver buffers where left port accepts incoming serial data and right port services CPU read requests. IC Role / Device Role / Timing Role: Slave SRAM synchronizing asynchronous data ingestion and deterministic polling with hardware BUSY arbitration. Use Value: Prevents data corruption during simultaneous access by stalling CPU reads when new frame arrives - enforced via BUSYR input gating. |
Use Scenario: Fault-tolerant flight computer using two independent processors sharing status registers and telemetry logs. IC Role / Device Role / Timing Role: Slave memory node in master/slave pair, receiving BUSY signals from master to coordinate write sequencing across channels. Use Value: Guarantees atomic updates to shared variables without software locks - hardware arbitration reduces worst-case latency by 3.2 μs vs. polling. |
| Real-Time Industrial PLC | Radar Signal Processing Buffer |
Use Scenario: Programmable logic controller with deterministic I/O scan cycle requiring consistent memory access timing across sensor and actuator interfaces. IC Role / Device Role / Timing Role: Slave port servicing fieldbus interface (left) and CPU instruction fetch (right) with guaranteed 25 ns read response. Use Value: Enables sub-100 μs I/O update cycles by eliminating software arbitration overhead and reducing memory wait states. |
Use Scenario: Pulse-Doppler radar front-end buffering digitized IF samples between ADC and FFT engine operating on staggered schedules. IC Role / Device Role / Timing Role: Dual-port SRAM acting as ping-pong buffer - one port streams ADC data while other feeds DSP pipeline. Use Value: Sustains 40 MB/s sustained throughput (8-bit × 5 MHz) with zero-cycle interlock due to independent port timing and no internal arbitration delay. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C133-25JC | 5 V, 2K × 8, 25 ns, but uses active-high CE and lacks BUSY input - requires external arbitration logic | Not suitable for master/slave expansion; limited to standalone dual-port use without hardware contention handling | Select only if system already implements discrete BUSY logic or uses single-port arbitration scheme |
| AS7C3256B-25JC | 3.3 V core, 32K × 8, 25 ns, no BUSY function, higher density but incompatible voltage and arbitration model | Requires level shifters and redesign of power/arb circuitry; unsuitable for drop-in replacement in LA-series designs | Consider only for greenfield 3.3 V systems needing larger memory depth and no BUSY dependency |
Compared with CY7C133-25JC and AS7C3256B-25JC, the 7142LA25JI uniquely delivers integrated slave-mode BUSY input gating and 2 V data retention - eliminating external logic while enabling fail-safe state preservation in power-interrupted environments.
Availability
7142LA25JI is available at Aetrix Electronics and suitable for avionics data buffering, redundant controller memory, real-time industrial PLCs, radar signal processing buffers, and battery-backed instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 7142LA25JI 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 high-performance memory, timing, and interface solutions for communications, computing, and industrial markets.
The IDT7142 product line was designed specifically as a slave companion to the IDT7132 master for building scalable, error-free dual-port SRAM systems - targeting aerospace, defense, and industrial control applications demanding deterministic arbitration and data integrity.
FAQ
What is the role of BUSYL and BUSYR on the 7142LA25JI?
On the 7142LA25JI, BUSYL and BUSYR are dedicated input pins - not outputs - that internally gate write operations when driven low by a master IDT7132. This hardware-based arbitration prevents simultaneous writes to the same memory location. The 7142LA25JI does not generate BUSY signals; it responds to them. This behavior is fixed and cannot be reconfigured.
Does the 7142LA25JI support battery backup, and what voltage is required?
Yes, the 7142LA25JI supports battery backup data retention at exactly 2.0 V (VDR), as specified in Table 6. This feature is exclusive to LA-series variants and is not present in SA versions. At VCC = 2.0 V, the device retains stored data with ICCDR ≤ 4000 µA (military/industrial) or ≤ 1500 µA (commercial), confirmed under TA = +25°C conditions.
Can the 7142LA25JI operate as a standalone dual-port RAM without a master device?
Yes, the 7142LA25JI can operate standalone: BUSYL and BUSYR inputs must be held high (e.g., via 270 Ω pull-ups to VCC) to disable write inhibition, enabling full read/write access on both ports. However, concurrent writes to identical addresses will result in undefined data - unlike master-equipped systems, no hardware arbitration occurs without external logic.
What package type is used for the 7142LA25JI, and are lead finish options specified?
The 7142LA25JI uses a 48-pin flatpack (FP48) package with ceramic body and side-brazed construction, measuring approximately 0.75″ × 0.75″ × 0.11″. Per datasheet note 3, the FP48 body dimensions are standardized. Lead finish is tin-lead (SnPb) unless otherwise ordered - RoHS-compliant versions require distinct part numbering not applicable to 7142LA25JI.
How does the 7142LA25JI differ from the IDT7132 series in terms of arbitration logic?
The 7142LA25JI contains no on-chip arbitration logic - it relies entirely on external BUSY signals from an IDT7132 master. In contrast, the IDT7132 integrates arbitration priority circuitry, generates open-drain BUSY outputs, and supports automatic port-to-port conflict resolution. This architectural split enables scalable memory width expansion without adding discrete gates, a capability absent in the 7142LA25JI alone.
7142LA25JI 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:
- 25ns
- Access Time:
- 25 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7142LA25JI FAQ
1.How can I place an order for 7142LA25JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA25JI 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 7142LA25JI reliable?
The price and inventory of 7142LA25JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA25JI is usually 5 days.
3.What payment methods are accepted for 7142LA25JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA25JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA25JI?
7142LA25JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA25JI 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 7142LA25JI?
For technical support, including 7142LA25JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA25JI requirements.
6.How does Aetrix verify that 7142LA25JI is sourced from the original manufacturer or authorized distributors?
All 7142LA25JI 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 7142LA25JI meets industry standards.
7.What is the process for return or replacement of 7142LA25JI?
All 7142LA25JI units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA25JI, 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 7142LA25JI part is unused and in its original packaging.
Return procedure for 7142LA25JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142LA25JI Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
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