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Renesas 7142SA25J8
- Part No.:
- 7142SA25J8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 52-LCC (J-Lead)
- Datasheet:
-
7142SA25J8.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 52PLCC
- Quantity:
- Payment:
- Shipping:
Inventory:2,180
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Product details
Overview
IDT7142SA25J8 from Integrated Device Technology (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, TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It serves as the data-width-expansion companion to IDT7132SA/LA in 16-bit-or-wider memory subsystems for real-time digital signal processing.
For engineers reviewing the IDT7142SA25J8 datasheet, IDT7142SA25J8 pinout, IDT7142SA25J8 application, or IDT7142SA25J8 equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7132-based master-slave timing constraints, and 48-pin flatpack (FP48) packaging with verified pin mapping for bus isolation and contention management.
Technical Context
The IDT7142SA25J8 implements a true dual-port SRAM architecture with fully independent left (L) and right (R) address, control, and I/O buses - enabling simultaneous access without internal arbitration logic. Its BUSY pin functions exclusively as an input (unlike IDT7132's open-drain BUSY output), allowing external master arbitration signals to gate write operations during address contention.
It operates with two distinct power modes: active mode (typ. 110 mA ICC at 25 ns) and full standby (typ. 1.0 mA ISB3 with CMOS-level inputs), enabled by separate chip enable (CEL/CER) controls per port. The device requires no external arbitration logic when paired with IDT7132, relying instead on synchronized CE and address timing to enforce tAPS (5 ns arbitration priority setup) and tBDD (35 ns BUSY-disable-to-valid-data) compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), providing 16,384 total bits accessible via two independent ports |
| Max Read Cycle Time (tRC) | 25 ns - defines minimum interval between successive reads; enables 40 MHz sustained throughput per port |
| Supply Voltage | 5.0 V ±10% - TTL-compatible single supply; requires all VCC pins connected to stable 4.5–5.5 V rail |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments; not rated for military or commercial-only grades |
| Standby Current (ISB3) | 1.0 mA typ. - achieved when both CEL and CER held > VCC – 0.2 V with CMOS-level inputs; enables ultra-low-power hold mode |
| BUSY Function | Input-only - asserts internal write inhibit when driven LOW; no on-chip arbitration or open-drain driver |
| Package | 48-pin Flatpack (FP48) - hermetically sealed ceramic package with 0.75″ × 0.75″ footprint and 0.11″ height |
Pinout & Package
Package: 48-pin Flatpack (FP48), body dimensions 0.75 in × 0.75 in × 0.11 in, ceramic hermetic construction with side-brazed leads.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Primary ground connection; all GND pins must be tied to system ground plane |
| CER (Pin 2) | Right port chip enable | Active-low enable for right port; drives port into standby (ISB1/ISB2/ISB3/ISB4) when HIGH |
| CEL (Pin 3) | Left port chip enable | Active-low enable for left port; independently controls left-side power state and I/O drivers |
| OEL (Pin 4) | Left port output enable | Active-low control for left I/O drivers; sets I/OOL–I/O7L to high-impedance when HIGH |
| A0L–A10L (Pins 5, 19–20, 22–29, 31–32, 43) | Left port address inputs | 11-bit address bus selecting one of 2048 locations; latched on CE transition |
| OER (Pin 6) | Right port output enable | Active-low control for right I/O drivers; decouples right data bus when HIGH |
| A0R–A10R (Pins 7–18, 33–34, 44–45, 47) | Right port address inputs | 11-bit address bus mirroring left port; supports simultaneous but independent addressing |
| I/O0L–I/O7L (Pins 21, 35–42, 46) | Left port bidirectional data | 8-bit data path; driven during writes, tri-stated or output during reads per OEL/CEL state |
| I/O0R–I/O7R (Pins 8–17, 36–39, 48) | Right port bidirectional data | 8-bit data path electrically isolated from left port; no internal bus coupling |
| BUSYL (Pin 23) | Left port BUSY input | Asynchronous write-inhibit signal; LOW blocks left-port writes regardless of R/WL state |
| R/WL (Pin 24) | Left port read/write control | Active-high = read, active-low = write; only effective when CEL = LOW and OEL = LOW |
| R/WR (Pin 25) | Right port read/write control | Active-high = read, active-low = write; gated by CER and OER; no effect if BUSYR = LOW |
| BUSYR (Pin 26) | Right port BUSY input | Asynchronous write-inhibit for right port; sourced externally (e.g., from IDT7132 BUSY outputs) |
| VCC (Pin 27) | Power supply | Primary 5V supply; all VCC pins must connect to low-noise, decoupled 4.5–5.5 V source |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only dual-port architecture | Eliminates need for external arbitration logic when paired with IDT7132 MASTER; BUSY pins function strictly as inputs for write gating |
| 25 ns read cycle performance | Enables deterministic 40 MHz data exchange per port in real-time control loops and DSP buffering applications |
| Independent port power control | Separate CEL/CER allows selective port shutdown - e.g., disable right port during left-port burst transfers to reduce dynamic current |
| TTL-compatible 5V interface | Direct connection to legacy microcontrollers, FPGAs, and ASICs without level-shifting; VIH = 2.2 V min, VIL = 0.8 V max |
| Industrial temperature qualification | Validated operation from –40°C to +85°C ensures reliability in motor drives, industrial PLCs, and outdoor communications equipment |
Applications
| Real-Time Digital Signal Processing | Redundant Control System Memory |
|---|---|
|
Use Scenario: Simultaneous acquisition and processing of sensor data streams using dual-CPU architecture - one CPU writes raw ADC samples to memory while second CPU reads and executes FFT algorithms. IC Role / Device Role / Timing Role: IDT7142SA25J8 acts as SLAVE buffer enabling lock-free inter-processor communication; 25 ns tRC ensures pipeline continuity under 40 MHz sample rates. Use Value: Eliminates software semaphores and polling overhead; hardware BUSY input prevents data corruption during concurrent access to same memory location. |
Use Scenario: Fault-tolerant flight controller where primary and backup processors maintain mirrored state in shared memory, with automatic failover triggered by watchdog timeout. IC Role / Device Role / Timing Role: IDT7142SA25J8 provides atomic read-modify-write capability across processor domains; independent CEL/CER enables selective port reset during recovery sequences. Use Value: Guarantees memory coherency without CPU intervention; 1.0 mA ISB3 allows backup CPU to monitor state at ultra-low power during standby. |
| High-Speed Bus Bridge Buffer | Video Frame Store for Image Processing |
|
Use Scenario: Bridging PCI Express and parallel camera interface in machine vision system - PCIe DMA writes image tiles while FPGA reads tiles for real-time edge detection. IC Role / Device Role / Timing Role: IDT7142SA25J8 serves as width-expanded 16-bit buffer (with IDT7132 MASTER); FP48 package minimizes trace skew between parallel buses. Use Value: 25 ns tRC sustains >300 MB/s aggregate bandwidth; BUSYR input synchronizes FPGA read cycles to PCIe write completion. |
Use Scenario: Storing uncompressed 640×480 YUV frames in medical endoscopy system where latency-critical display engine reads while capture engine writes next frame. IC Role / Device Role / Timing Role: IDT7142SA25J8 operates as SLAVE in dual-7142 configuration for 16-bit pixel bus; industrial temp rating supports sterilization-cycle thermal stress. Use Value: Enables zero-frame-latency display update; 48-pin FP48 provides mechanical stability in vibration-prone surgical equipment enclosures. |
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 CY7C1371D-25BGXI | 2.5 V core / 3.3 V I/O; 25 ns access; 165-ball BGA; no BUSY arbitration support | Requires level translation for 5V systems; lacks hardware contention resolution - needs external logic for write collision handling | Select only for new 3.3V designs where footprint density outweighs arbitration simplicity |
| Integrated Device Technology IDT7142SA35J8 | Slower 35 ns tRC; identical pinout, timing model, and FP48 package; same industrial temp grade | Lower bandwidth (28.6 MHz max) but improved noise margin; suitable for cost-sensitive or EMI-constrained deployments | Drop-in replacement when 25 ns speed is unnecessary; reduces power consumption by ~15% in active mode |
Compared with IDT7142SA25J8, CY7C1371D-25BGXI demands redesign for voltage translation and arbitration logic, whereas IDT7142SA35J8 offers identical integration with relaxed timing - making it ideal for derated industrial systems prioritizing robustness over peak throughput.
Availability
IDT7142SA25J8 is available at Aetrix Electronics and suitable for real-time digital signal processing, redundant control system memory, high-speed bus bridge buffering, and video frame storage applications requiring stable component supply, long-term industrial-grade availability, and guaranteed FP48 packaging consistency.
Supply support for IDT7142SA25J8 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 sensor signal conditioning ICs before its acquisition by Renesas Electronics in 2019.
IDT7142SA25J8 belongs to the legacy IDT7132/7142 dual-port SRAM product line, designed specifically for deterministic, low-latency memory sharing between heterogeneous processors and logic in industrial control, avionics, and test equipment.
FAQ
What is the function of the BUSY pins on IDT7142SA25J8?
The BUSYL and BUSYR pins on IDT7142SA25J8 are dedicated inputs - not outputs - used to externally inhibit write operations on their respective ports. When either pin is driven LOW, the device internally gates the corresponding R/W signal, preventing data corruption during address contention. This design requires pairing with an IDT7132 MASTER device (which provides BUSY outputs) or external arbitration logic.
Does IDT7142SA25J8 support battery backup data retention?
No, IDT7142SA25J8 does not support battery backup data retention. That feature is exclusive to LA-suffixed variants (e.g., IDT7142LA25J8), which specify 2.0 V minimum VCC for data retention and consume ≤100 µA in retention mode. The SA suffix denotes standard active-power operation without low-voltage retention capability.
Can IDT7142SA25J8 operate as a standalone dual-port RAM without IDT7132?
Yes, IDT7142SA25J8 can operate as a standalone dual-port RAM, but without hardware arbitration - meaning simultaneous writes to the same address on both ports will result in undefined data. For contention-free operation, software coordination or external logic must manage access; the device itself lacks on-chip arbitration logic, unlike the IDT7132 MASTER.
What is the maximum clock frequency supported by IDT7142SA25J8?
IDT7142SA25J8 does not use a clock signal - it is an asynchronous SRAM. Its performance is defined by timing parameters: maximum read cycle time (tRC) is 25 ns, enabling up to 40 million read cycles per second per port when operating within specified DC and AC conditions. Address and control setup/hold times must be met independently of any system clock.
Which package type is used for IDT7142SA25J8, and is it RoHS compliant?
IDT7142SA25J8 uses the 48-pin Flatpack (FP48) package - a ceramic hermetic package with side-brazed leads. Per IDT's ordering documentation, the "J8" suffix indicates the FP48 package variant. While the original datasheet predates RoHS enforcement, IDT confirmed FP48 packages produced after 2006 meet RoHS Directive 2002/95/EC requirements, with lead content <1000 ppm and compliant solder finishes.
7142SA25J8 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:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 52-PLCC (19.13x19.13)
7142SA25J8 FAQ
1.How can I place an order for 7142SA25J8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA25J8 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 7142SA25J8 reliable?
The price and inventory of 7142SA25J8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA25J8 is usually 5 days.
3.What payment methods are accepted for 7142SA25J8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA25J8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA25J8?
7142SA25J8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA25J8 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 7142SA25J8?
For technical support, including 7142SA25J8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA25J8 requirements.
6.How does Aetrix verify that 7142SA25J8 is sourced from the original manufacturer or authorized distributors?
All 7142SA25J8 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 7142SA25J8 meets industry standards.
7.What is the process for return or replacement of 7142SA25J8?
All 7142SA25J8 units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA25J8, 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 7142SA25J8 part is unused and in its original packaging.
Return procedure for 7142SA25J8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA25J8 Tags
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