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Renesas 7142SA25J
- Part No.:
- 7142SA25J
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142SA25J.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
7142SA25J 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, with 25 ns maximum read cycle time (tRC), TTL-compatible 5 V ±10% supply, 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 7142SA25J datasheet, 7142SA25J pinout, 7142SA25J application, or 7142SA25J equivalent, this page delivers verified timing parameters, BUSY input behavior, package-specific pin mapping, and validated alternatives for 16-bit-or-wider dual-port SRAM architectures requiring deterministic arbitration without external logic.
Technical Context
The 7142SA25J implements a dedicated slave port interface with BUSY as an input-only signal that gates internal write operations when asserted low, enabling hardware-controlled contention resolution in synchronized master/slave configurations. It lacks on-chip arbitration logic - all arbitration decisions are driven externally by the companion IDT7132 master device.
Its dual-port architecture provides fully independent address, control, and I/O buses per port (A0L–A10L/I/O0L–I/O7L/OEL/CEL/R/WL/BUSYL and A0R–A10R/I/O0R–I/O7R/OER/CER/R/WR/BUSYR), with CE-controlled power-down modes yielding ISB3 ≤ 1.0 mA (full standby, CMOS inputs) and ICC ≤ 110 mA (dynamic operation at fMAX).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), non-volatile only during battery backup (LA variant); SA variant retains data only under active VCC |
| Max Read Cycle Time (tRC) | 25 ns - defines minimum interval between successive reads on same port; enables 40 MHz sustained throughput in pipelined systems |
| Bus Interface | TTL-compatible inputs/outputs; VIL ≤ 0.8 V, VIH ≥ 2.2 V, VOL ≤ 0.4 V @ 4 mA - ensures interoperability with legacy 5 V logic families |
| Power Consumption | Active: 110 mA typ. (ICC), Standby (ISB3): 1.0 mA typ. - supports low-duty-cycle monitoring applications with rapid wake-up |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems including motor drives and programmable logic controllers |
| BUSY Function | Input-only (slave role); asserts write-inhibit when low - eliminates need for external arbitration logic in width-expanded memory arrays |
| Supply Voltage | 5.0 V ±10% (4.5 V to 5.5 V) - compatible with standard 5 V rail without regulation overhead |
Pinout & Package
7142SA25J is packaged in a 48-pin flatpack (FP48) with 0.75″ × 0.75″ footprint and 0.11″ height, featuring dual-row gull-wing leads and index mark for orientation. All VCC and GND pins must be connected per datasheet note; no internal decoupling provided.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Common return path for both ports; two dedicated pins reduce ground bounce in high-speed dual-access scenarios |
| VCC (Pin 25) | Power supply | Single 5 V supply powers entire device; requires external 0.1 µF ceramic decoupling adjacent to pin |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; deassertion places port in ISB1/ISB2/ISB3/ISB4 standby states depending on input levels |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; high-impedance state prevents bus contention during multi-port sharing |
| R/WL / R/WR | Read/write control (left/right) | Low = write, high = read; determines direction of data flow on I/O lines during enabled cycles |
| BUSYL / BUSYR | Arbitration input (slave) | Inputs only - low level inhibits writes on corresponding port; tied to IDT7132 master's open-drain BUSY outputs via 270 Ω pull-up |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit address buses select one of 2048 locations independently per port; no internal address latching |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O (left/right) | Bidirectional 8-bit data paths; drivers enter high-Z when OE or CE inactive - enables shared bus topologies |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY interface | Eliminates need for external AND/OR gates in width-expanded systems - BUSY input directly gates write logic internally |
| Independent port power control | CE-driven standby modes (ISB1–ISB4) allow selective port shutdown, reducing dynamic power by >90% per disabled port |
| 25 ns access performance | Enables real-time dual-port operation in 40 MHz clock domains without wait states - critical for radar pulse buffering |
| TTL-compatible signaling | Interoperates with legacy FPGA I/O banks, microcontroller GPIOs, and ASIC interfaces without level-shifting circuitry |
| Industrial temperature qualification | Validated operation from –40°C to +85°C ensures reliability in uncontrolled environments like factory automation cabinets |
Applications
| Avionics Data Buffering | Radar Signal Processing |
|---|---|
|
Use Scenario: Real-time buffering of ARINC 429 or MIL-STD-1553B bus data between flight computer and sensor subsystems. IC Role / Device Role / Timing Role: Slave dual-port SRAM synchronizing asynchronous bus transfers using IDT7132 master's BUSY arbitration. Use Value: Eliminates software-managed semaphores; guarantees atomic 16-bit word writes across dual buses with <25 ns latency. |
Use Scenario: Storing intermediate FFT coefficients during real-time SAR image formation in airborne radar systems. IC Role / Device Role / Timing Role: Left port accepts ADC stream at 20 MSPS; right port feeds DSP core at 40 MHz - no FIFO logic required. Use Value: Enables zero-latency ping-pong memory access with deterministic tRC = 25 ns, avoiding pipeline stalls in compute-bound kernels. |
| Industrial PLC Memory Expansion | Digital Oscilloscope Acquisition Buffer |
|
Use Scenario: Extending local memory in modular I/O controllers handling analog input sampling and PID loop execution. IC Role / Device Role / Timing Role: Slave unit paired with IDT7132 master to form 16-bit-wide memory bank accessible by CPU and fieldbus engine. Use Value: Supports concurrent register read (CPU) and cyclic data upload (PROFIBUS DP) without arbitration firmware overhead. |
Use Scenario: Capturing high-speed waveform samples at 100 MS/s while simultaneously streaming to display engine and storage. IC Role / Device Role / Timing Role: Dual-port buffer decoupling acquisition front-end (left port) from rendering back-end (right port). Use Value: Sustains continuous 2K-sample capture at full rate with no dead time - tRC = 25 ns allows 40 MHz readout interleaving. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C136-25JC | 2K × 8, 25 ns, 5 V, but uses bidirectional BUSY (input/output) and lacks dedicated slave mode; requires external arbitration logic for width expansion | Not drop-in for IDT7132/7142 master/slave systems; suitable only for standalone or custom-arbitrated designs | Select when migrating legacy Cypress-based systems; verify BUSY timing integration with existing controller firmware |
| AS7C3256B-25JC | 32K × 8, 25 ns, 3.3 V supply; no BUSY pin - relies on software semaphore or external logic for port contention | Requires voltage translation and arbitration redesign; not suitable for direct replacement in IDT7142-based width-expansion stacks | Choose for higher-density, lower-power applications where bus voltage is 3.3 V and arbitration can be managed externally |
Compared with CY7C136-25JC and AS7C3256B-25JC, the 7142SA25J delivers guaranteed hardware arbitration via dedicated BUSY input, eliminating firmware complexity and external gates - essential for deterministic real-time systems where write collision avoidance must be cycle-accurate.
Availability
7142SA25J is available at Aetrix Electronics and suitable for avionics data buffering, radar signal processing, and industrial PLC memory expansion requiring stable component supply across extended production lifecycles.
Supply support for 7142SA25J 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 semiconductor company specializing in timing, memory, and interface solutions, now part of Renesas Electronics since 2019.
The IDT7132/7142 family was designed specifically for deterministic dual-port memory expansion in real-time embedded systems - prioritizing hardware arbitration, low-latency access, and industrial temperature resilience over density or power efficiency.
FAQ
What is the function of BUSYL and BUSYR on the 7142SA25J?
On the 7142SA25J, BUSYL and BUSYR are dedicated input-only pins that receive arbitration signals from an IDT7132 master device. When either pin is driven low, the corresponding port's write operation is internally inhibited - this hardware-level gating prevents data corruption during simultaneous access to the same memory location, and no external logic is needed to implement this behavior in the 7142SA25J.
Can the 7142SA25J operate as a standalone dual-port RAM without an IDT7132 master?
Yes, the 7142SA25J can operate as a standalone dual-port RAM, but it lacks on-chip arbitration logic and BUSY output capability. In standalone mode, BUSYL and BUSYR must be held high (via pull-up resistors) to enable writes, and external arbitration - such as software semaphores or discrete logic - is required to prevent write collisions when both ports access the same address concurrently.
What is the maximum operating frequency supported by the 7142SA25J?
While the 7142SA25J does not specify a clock frequency, its 25 ns maximum read cycle time (tRC) implies a theoretical upper limit of 40 MHz for consecutive read operations on a single port. For sustained dual-port operation with overlapping accesses, system timing must respect tAA, tACE, tAOE, and BUSY propagation delays - actual achievable throughput depends on controller design and bus loading.
Does the 7142SA25J support battery backup for data retention?
No, the 7142SA25J is the SA (standard power) variant and does not support battery backup. Only the LA variant (e.g., 7142LA25J) provides 2 V data retention capability. The SA version retains data only while powered by its nominal 5 V supply; removal of VCC results in immediate data loss.
Which packages are available for the 7142SA25J?
The 7142SA25J is available in the 48-pin flatpack (FP48) package, with dimensions of approximately 0.75″ × 0.75″ × 0.11″. Other variants of the 7142 family offer DIP, LCC, and PLCC options, but the -25J speed grade and SA power variant are specifically qualified and shipped in FP48 for industrial reliability and thermal performance.
7142SA25J 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7142SA25J FAQ
1.How can I place an order for 7142SA25J through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA25J 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 7142SA25J reliable?
The price and inventory of 7142SA25J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA25J is usually 5 days.
3.What payment methods are accepted for 7142SA25J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA25J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA25J?
7142SA25J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA25J 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 7142SA25J?
For technical support, including 7142SA25J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA25J requirements.
6.How does Aetrix verify that 7142SA25J is sourced from the original manufacturer or authorized distributors?
All 7142SA25J 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 7142SA25J meets industry standards.
7.What is the process for return or replacement of 7142SA25J?
All 7142SA25J units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA25J, 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 7142SA25J part is unused and in its original packaging.
Return procedure for 7142SA25J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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