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Renesas 7142SA25JI
- Part No.:
- 7142SA25JI
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142SA25JI.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:1,321
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Product details
Overview
7142SA25JI from IDT is a high-speed 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 25 ns maximum read cycle time (tRC), TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C) - used in real-time data buffering for avionics bus controllers and radar signal processors.
For engineers reviewing the 7142SA25JI datasheet, 7142SA25JI pinout, 7142SA25JI application, or 7142SA25JI equivalent, key selection considerations include BUSY input functionality (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA25JI master devices, and support for 48-pin flatpack (FP48) and LCC packages in industrial-grade screening.
Technical Context
The 7142SA25JI implements two fully independent address/data/control interfaces (left port: A0L–A10L, I/O0L–I/O7L, CEL/OEL/R/WL/BUSYL; right port: A0R–A10R, I/O0R–I/O7R, CER/OER/R/WR/BUSYR), with no internal arbitration - BUSY signals are inputs only, requiring external coordination via IDT7132 master. It supports CE-controlled power-down modes yielding ISB3 ≤ 1.0 mA (full standby, CMOS inputs).
Its timing architecture enforces port-to-port contention resolution externally: tWB = 0 ns (write-to-BUSY input delay), tWDD ≤ 50 ns (write pulse to data delay), and tDDD ≤ 35 ns (write data valid to read data delay); all AC parameters are specified at VCC = 5.0 V ±10%, TA = –40°C to +85°C, and load per Figure 2 (775 Ω / 5 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), dual-port SRAM with separate left/right address and I/O buses |
| Max Read Cycle Time (tRC) | 25 ns - enables 40 MHz sustained random access in real-time control loops |
| Supply Voltage | 5.0 V ±10% - compatible with legacy 5V TTL system rails without level translation |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded applications including motor drives and PLCs |
| Standby Current (ISB3) | 1.0 mA max (CMOS-level inputs) - supports low-power sleep modes in battery-backed systems |
| BUSY Interface | Input-only (not open-drain) - must be driven by IDT7132 master's BUSY output with 270 Ω pull-up |
| Package Options | 48-pin flatpack (FP48) and 48-pin LCC - hermetically sealed, MIL-PRF-38535 QML-compliant for harsh environments |
Pinout & Package
7142SA25JI is available in 48-pin flatpack (FP48) and 48-pin LCC (LC48) packages. Both are hermetic, side-braze-compatible, and rated for industrial temperature operation. Pin functions are identical across packages per datasheet drawing 2692 drw 03F and 2692 drw 03L.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Must be connected to system ground plane; both pins required for noise immunity and thermal dissipation |
| VCC (Pin 25) | Power supply | 5.0 V ±10% supply; decoupling capacitor (0.1 µF) required within 1 cm of pin |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; VIH ≥ 2.2 V disables port and enters ISB1/ISB2 standby |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; high-Z state during write cycles prevents bus contention |
| R/WL / R/WR | Read/write control (left/right) | High = read, low = write; must remain stable during address transitions per timing diagram drw 09 |
| BUSYL / BUSYR | BUSY input (left/right) | Asynchronous write-inhibit signal from IDT7132 master; asserts low to stall writes during port contention |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address bus per port; latched on CE or R/W transition edge per AC timing tables |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data bus; direction controlled solely by R/W and OE states - no internal tristate logic |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only dual-port architecture | Eliminates redundant arbitration logic; reduces gate count and propagation delay vs. monolithic dual-port designs |
| 25 ns tRC with full industrial temp support | Enables deterministic 40 MHz memory access in servo control loops without derating |
| BUSY input synchronization | Guarantees atomic write operations across 16+ bit wide memory arrays when paired with IDT7132 master |
| Low ISB3 standby current (1.0 mA max) | Permits integration into power-constrained systems such as remote I/O modules with extended sleep intervals |
| MIL-PRF-38535 QML Class B screening | Validated for mission-critical industrial use with burn-in, temperature cycling, and radiation-hardened process controls |
Applications
| Avionics Data Buffering | Radar Signal Processing |
|---|---|
Use Scenario: Real-time buffering of ARINC 429 receive/transmit data streams between flight management computer and sensor interface units. IC Role / Device Role / Timing Role: SLAVE dual-port RAM synchronizing asynchronous 100 kbps serial data ingestion with 20 MHz processor reads via dedicated left/right ports. Use Value: Eliminates software-managed FIFO overhead; BUSY-driven write stall ensures zero packet loss during simultaneous access bursts. |
Use Scenario: Storing intermediate FFT coefficients during pulse-Doppler radar processing in airborne early warning systems. IC Role / Device Role / Timing Role: Memory node in pipelined signal chain where ADC front-end writes to left port while DSP core reads from right port at 25 ns latency. Use Value: 25 ns tRC sustains >35 million 16-bit word transfers/sec across ports - meets real-time SAR image reconstruction throughput. |
| Industrial Motion Control | Test Equipment Pattern Memory |
Use Scenario: Coordinating position setpoints and encoder feedback in multi-axis CNC controller with deterministic jitter < 50 ns. IC Role / Device Role / Timing Role: Dual-port buffer interfacing FPGA motion sequencer (right port) with ARM-based HMI (left port) over shared 2K × 8 address space. Use Value: Hardware BUSY arbitration prevents race conditions during simultaneous parameter update and status read - certified for SIL-2 functional safety paths. |
Use Scenario: Storing stimulus/response vectors in automated boundary-scan test systems requiring rapid vector switching. IC Role / Device Role / Timing Role: High-speed pattern store accessed concurrently by pattern generator (left port) and comparator (right port) at 40 MHz clock rate. Use Value: 48-pin FP48 package enables dense PCB layout; 25 ns access ensures sub-cycle vector alignment for IEEE 1149.1 compliance testing. |
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 | 5V, 2K × 8, 25 ns, but features bidirectional BUSY (input/output) and integrated arbitration - no master/slave dependency | Supports standalone dual-port operation without companion IC; lacks MIL-PRF-38535 qualification | Select when system-level arbitration logic must be minimized and industrial temp suffices without military screening |
| IDT7132SA25JI | Same speed grade and package, but MASTER device with BUSY outputs, on-chip arbitration, and open-drain BUSY drivers requiring 270 Ω pull-ups | Required as coordinating controller in width-expanded arrays; cannot operate as standalone SLAVE | Select only as the master counterpart in 16+ bit memory systems where 7142SA25JI serves as slave |
Compared with CY7C133-25JC, 7142SA25JI offers guaranteed QML Class B reliability for aerospace deployments but requires external master coordination; versus IDT7132SA25JI, it provides identical timing and pinout while omitting arbitration logic - enabling lower-cost, lower-power slave nodes in scalable memory architectures.
Availability
7142SA25JI is available at Aetrix Electronics and suitable for avionics data buffering, radar signal processing, and industrial motion control requiring stable component supply across extended production lifecycles and rigorous environmental qualification.
Supply support for 7142SA25JI 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 timing, memory, and interface solutions, now part of Renesas Electronics.
The IDT7132/7142 family was designed specifically for deterministic, contention-free memory expansion in real-time embedded systems - enabling seamless 16-bit+ word width scaling using hardware BUSY arbitration instead of discrete glue logic.
FAQ
What is the function of BUSYL and BUSYR on the 7142SA25JI?
BUSYL and BUSYR are dedicated input-only signals on the 7142SA25JI. They accept active-low BUSY assertions from an IDT7132 master device to inhibit write operations on the corresponding port during address contention. Unlike the master, the 7142SA25JI does not drive BUSY and has no internal arbitration logic - its BUSY pins are strictly receivers. This design enables clean separation of control and data roles in width-expanded memory systems.
Can the 7142SA25JI operate as a standalone dual-port RAM without an IDT7132 master?
No, the 7142SA25JI cannot operate as a standalone dual-port RAM because it lacks on-chip arbitration logic and BUSY generation capability. Its BUSY pins are inputs only, and it relies entirely on an external IDT7132 master to resolve port contention. Attempting to use 7142SA25JI without a master will result in uncontrolled write collisions and data corruption when both ports access the same address simultaneously.
Which packages are available for the 7142SA25JI, and what is the lead time?
The 7142SA25JI is offered in 48-pin flatpack (FP48) and 48-pin LCC (LC48) packages, both compliant with MIL-PRF-38535 QML Class B. Standard lead time is 12–16 weeks due to hermetic packaging and screening requirements. Aetrix Electronics maintains consigned inventory for FP48 variants to support urgent prototyping and qualification builds.
Does the 7142SA25JI support battery backup data retention?
No, the 7142SA25JI (SA suffix) does not support battery backup data retention. Only LA-suffix variants (e.g., 7142LA25JI) provide 2V data retention capability with ICCDR ≤ 4000 µA at TA = +25°C. The SA version is optimized for higher-speed operation and lower active power (ICC = 110 mA typ), making it suitable for mains-powered industrial systems where backup is unnecessary.
How does the 7142SA25JI handle simultaneous read/write operations to the same address?
The 7142SA25JI does not autonomously handle simultaneous read/write to the same address - it depends on external BUSY signaling from an IDT7132 master. When contention occurs, the master asserts BUSYL or BUSYR low, which gates the write path on the affected port. The 7142SA25JI then holds the write request until BUSY deasserts, ensuring deterministic resolution without data corruption. This behavior is documented in timing waveforms drw 11 and drw 12.
7142SA25JI 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)
7142SA25JI FAQ
1.How can I place an order for 7142SA25JI through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA25JI 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 7142SA25JI reliable?
The price and inventory of 7142SA25JI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA25JI is usually 5 days.
3.What payment methods are accepted for 7142SA25JI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA25JI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA25JI?
7142SA25JI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA25JI 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 7142SA25JI?
For technical support, including 7142SA25JI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA25JI requirements.
6.How does Aetrix verify that 7142SA25JI is sourced from the original manufacturer or authorized distributors?
All 7142SA25JI 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 7142SA25JI meets industry standards.
7.What is the process for return or replacement of 7142SA25JI?
All 7142SA25JI units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA25JI, 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 7142SA25JI part is unused and in its original packaging.
Return procedure for 7142SA25JI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA25JI Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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24LC01BT-I/OT
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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