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Renesas 7142SA25JI8
- Part No.:
- 7142SA25JI8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142SA25JI8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,052
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Product details
Overview
7142SA25JI8 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 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It serves as the data-width expansion companion to IDT7132SA master RAMs in 16-bit-or-wider memory subsystems for real-time embedded controllers.
For engineers reviewing the 7142SA25JI8 datasheet, 7142SA25JI8 pinout, 7142SA25JI8 application, or 7142SA25JI8 equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA/LA master devices, and support for 48-pin flatpack (JI8) packaging with verified industrial-grade reliability.
Technical Context
The 7142SA25JI8 implements two fully independent address/data/control interfaces - left port (A0L–A10L, I/O0L–I/O7L, CEL/OEL/R/WL, BUSYL) and right port (A0R–A10R, I/O0R–I/O7R, CER/OER/R/WR, BUSYR) - enabling concurrent access without software coordination. Its SLAVE role means BUSY pins are inputs only, used to gate write operations when asserted by an external IDT7132 master.
It lacks internal arbitration logic and relies entirely on externally supplied BUSY signals to prevent simultaneous writes to identical addresses. Power management uses CE-driven automatic standby, achieving 1.0 mA full-standby current (ISB3) and 25 mA one-port active standby (ISB2) under TTL-level inputs at VCC = 5.0 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 bits (2048 words × 8 bits per word), providing 16 KB total capacity across both ports |
| Access Time (tRC) | 25 ns max - defines minimum read cycle interval; enables 40 MHz sustained throughput in non-contention scenarios |
| Supply Voltage | 4.5 V to 5.5 V - supports standard 5V TTL logic families without level-shifting |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments including motor control and factory automation |
| Standby Current (ISB3) | 1.0 mA max (both ports, CMOS-level inputs) - enables low-power hold mode during system sleep states |
| Input Leakage (|ILI|) | 10 µA max - ensures stable address/control sampling under high-impedance bus conditions |
| Output Drive | 4 mA sink/source - compatible with standard TTL loads without external buffers |
Pinout & Package
7142SA25JI8 is packaged in a 48-pin flatpack (JI8), measuring approximately 0.75 in × 0.75 in × 0.11 in, with all VCC and GND pins requiring direct connection to respective supply rails per datasheet note.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24, 48) | Ground reference | Three dedicated ground pins ensure low-impedance return paths for both ports and reduce switching noise coupling |
| VCC (Pin 25) | Power supply | Single 5V supply powers entire device; all VCC pins must be connected per layout requirement |
| CEL / CER | Chip enable (left/right) | Active-low enables respective port; drives ISB1/ISB2 standby modes when high |
| OEL / OER | Output enable (left/right) | Active-low controls I/O drivers; sets outputs to high-Z when deasserted |
| R/WL / R/WR | Read/write control (left/right) | Active-low selects write mode; high enables read operation and output driver activation |
| BUSYL / BUSYR | BUSY input (left/right) | SLAVE-only function: low-level assertion inhibits writes on corresponding port; requires external pull-up |
| A0L–A10L / A0R–A10R | Address inputs (left/right) | 11-bit addressing per port selects one of 2048 memory locations independently |
| I/O0L–I/O7L / I/O0R–I/O7R | Data I/O bidirectional (left/right) | 8-bit parallel data path per port; direction controlled by R/W and OE states |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port independence | Full asynchronous access on left and right ports with separate address, control, and data buses - eliminates software serialization overhead |
| SLAVE-specific BUSY interface | BUSY pins function exclusively as inputs to receive arbitration signals from IDT7132 master - no internal logic required, reducing complexity in width-expanded arrays |
| Industrial temperature qualification | Guaranteed operation from –40°C to +85°C across all speed grades - suitable for under-hood automotive ECUs and industrial PLCs |
| Low-power standby modes | ISB3 = 1.0 mA (full standby, CMOS inputs) and ISB2 = 25 mA (one port active) - enables energy-efficient multi-port memory management |
| TTL-compatible signaling | VIH = 2.2 V min, VIL = 0.8 V max, VOH = 2.4 V min, VOL = 0.4 V max - interoperable with legacy 5V microcontrollers and FPGAs without level translation |
Applications
| Real-Time Digital Signal Processing | Redundant Control System Memory |
|---|---|
Use Scenario: Simultaneous data acquisition (ADC stream) and algorithm execution (FFT) in a single-cycle deterministic loop. IC Role / Device Role / Timing Role: SLAVE 7142SA25JI8 provides second 8-bit port for DMA-driven input buffering while master IDT7132 handles CPU-side computation reads. Use Value: 25 ns tRC enables sub-40 ns memory access latency, meeting tight 100 MHz DSP clock timing budgets without wait states. |
Use Scenario: Dual-CPU safety-critical controller where primary and backup processors share mirrored memory space. IC Role / Device Role / Timing Role: 7142SA25JI8 acts as slave in mirrored pair with IDT7132 master, receiving synchronized BUSY signals to prevent conflicting writes during failover transitions. Use Value: Hardware-enforced write inhibition via BUSY input eliminates race conditions during cross-processor state synchronization. |
| High-Speed Industrial Bus Interface | Legacy Microcontroller Memory Expansion |
Use Scenario: Bridging CAN FD and Ethernet AVB traffic using shared buffer memory between protocol stacks. IC Role / Device Role / Timing Role: Left port connects to CAN FD controller (burst writes), right port connects to Ethernet MAC (streaming reads); BUSY prevents overwrites during burst-to-stream handoff. Use Value: Independent port timing allows CAN FD packet writes (≤25 ns) to complete before Ethernet reads begin - eliminating inter-protocol blocking. |
Use Scenario: Expanding 8-bit microcontroller data bus to 16-bit width using IDT7132/7142 pair without external glue logic. IC Role / Device Role / Timing Role: 7142SA25JI8 serves as lower-byte SLAVE in 16-bit word configuration, accepting BUSY from IDT7132 master to coordinate byte-lane writes. Use Value: Eliminates need for discrete AND gates or CPLD arbitration logic - reduces BOM count and PCB area in cost-sensitive industrial designs. |
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 - not SLAVE-only | Supports standalone dual-port use without master pairing; incompatible with IDT7132/7142 width-expansion topology | Select only if replacing entire IDT architecture; not drop-in for 7142SA25JI8 in existing MASTER/SLAVE layouts |
| IDT7134SA25JI8 | Same family, 4K × 8 organization, 25 ns, SLAVE device - larger memory depth but identical pinout and BUSY behavior | Provides double memory depth for applications needing >2K words; requires address decoding changes beyond A10 | Preferred upgrade path when memory size is limiting, with minimal layout impact due to pin compatibility |
Compared with CY7C133-25JC and IDT7134SA25JI8, the 7142SA25JI8 delivers optimized cost and footprint for fixed 2K × 8 width-expansion roles, retains strict SLAVE semantics for seamless integration with IDT7132 masters, and avoids unnecessary arbitration logic overhead in dedicated master/slave topologies.
Availability
7142SA25JI8 is available at Aetrix Electronics and suitable for real-time digital signal processing, redundant control system memory, high-speed industrial bus interface, and legacy microcontroller memory expansion requiring stable component supply and long-term industrial-grade availability.
Supply support for 7142SA25JI8 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 IDT7132/7142 product line was designed specifically for deterministic, low-latency dual-port memory expansion in real-time embedded systems - emphasizing hardware arbitration, industrial temperature resilience, and seamless width-scaling without external logic.
FAQ
What is the function of BUSYL and BUSYR on the 7142SA25JI8?
On the 7142SA25JI8, BUSYL and BUSYR are dedicated input-only terminals that accept BUSY signals from an external IDT7132 master device. When either pin is driven low, the corresponding port's write operation is internally inhibited - this is fundamental to its SLAVE role. Unlike the IDT7132, the 7142SA25JI8 does not generate BUSY signals; it responds to them. Pull-up resistors (270 Ω) are required on these lines per datasheet Figure 3.
Can the 7142SA25JI8 operate as a standalone dual-port RAM without an IDT7132 master?
Yes, the 7142SA25JI8 can operate as a standalone dual-port RAM, but only in non-contention scenarios. Since it lacks on-chip arbitration logic and BUSY generation capability, simultaneous writes to identical addresses on both ports will result in undefined data. For deterministic operation under contention, an external arbitration scheme - such as an IDT7132 master or discrete logic - must be used. The 7142SA25JI8 datasheet explicitly positions it as a SLAVE device for width expansion.
What package type does the 7142SA25JI8 use, and what are its mechanical dimensions?
The 7142SA25JI8 uses a 48-pin flatpack package designated JI8, with approximate dimensions of 0.75 inches × 0.75 inches × 0.11 inches. This hermetically sealed ceramic flatpack meets MIL-PRF-38535 QML requirements for military and industrial applications. Pin 1 is identified by an index mark, and all VCC (pin 25) and GND (pins 1, 24, 48) connections must be made directly to respective power planes per datasheet Note 1 and 2.
How does the 7142SA25JI8 manage power consumption during inactive periods?
The 7142SA25JI8 implements CE-controlled automatic power-down: when CEL or CER is high, the corresponding port enters standby mode. In full standby (both CE high, CMOS-level inputs), ISB3 is 1.0 mA max; with one port active and the other disabled, ISB2 is 25 mA max. These values are measured at VCC = 5.0 V and TA = +25°C. The device draws zero dynamic current during true high-Z states, making it suitable for battery-backed or energy-constrained industrial nodes.
Is the 7142SA25JI8 compatible with 3.3V logic systems?
No, the 7142SA25JI8 is strictly a 5V TTL-compatible device with VIH minimum of 2.2 V and VIL maximum of 0.8 V - it is not 3.3V tolerant. Driving its inputs with 3.3V logic may result in marginal or non-functional operation, especially under voltage droop or temperature extremes. For mixed-voltage systems, level-shifting circuitry or a 3.3V-native dual-port SRAM (e.g., IDT70V25) must be used instead of the 7142SA25JI8.
7142SA25JI8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 52-LCC (J-Lead)
- Packaging:
- Tape & Reel (TR)
- 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)
7142SA25JI8 FAQ
1.How can I place an order for 7142SA25JI8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA25JI8 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 7142SA25JI8 reliable?
The price and inventory of 7142SA25JI8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA25JI8 is usually 5 days.
3.What payment methods are accepted for 7142SA25JI8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA25JI8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA25JI8?
7142SA25JI8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA25JI8 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 7142SA25JI8?
For technical support, including 7142SA25JI8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA25JI8 requirements.
6.How does Aetrix verify that 7142SA25JI8 is sourced from the original manufacturer or authorized distributors?
All 7142SA25JI8 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 7142SA25JI8 meets industry standards.
7.What is the process for return or replacement of 7142SA25JI8?
All 7142SA25JI8 units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA25JI8, 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 7142SA25JI8 part is unused and in its original packaging.
Return procedure for 7142SA25JI8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA25JI8 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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M24C02-FMC6TG
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AT24C08C-STUM-T
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