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Renesas 7142LA35P
- Part No.:
- 7142LA35P
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142LA35P.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 48DIP
- Quantity:
- Payment:
- Shipping:
Inventory:1,716
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Product details
Overview
IDT7142LA35P 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 35 ns maximum read cycle time, TTL-compatible 5 V ±10% operation, and industrial temperature range (–40°C to +85°C). It enables error-free 16-bit-or-wider memory systems when paired with IDT7132 master RAMs.
For engineers reviewing the IDT7142LA35P datasheet, IDT7142LA35P pinout, IDT7142LA35P application, or IDT7142LA35P equivalent, key selection considerations include its BUSY input role (not output), battery-backed data retention at 2 V, low standby current (1 µA typical full-standby), and compatibility with 48-pin flatpack, LCC, DIP, and 52-pin PLCC packages.
Technical Context
The IDT7142LA35P implements fully independent dual-port architecture with separate address, control, and I/O buses per port-no internal arbitration logic. Its BUSY pin functions strictly as an input for write-inhibit signaling from an external IDT7132 master, unlike the IDT7132 which contains on-chip arbitration and open-drain BUSY outputs.
It supports two distinct power-down modes: TTL-level standby (ISB1/ISB2) and CMOS-level full-standby (ISB3/ISB4), achieving 1 µA typical current in ISB3 mode. Data retention at 2 V is guaranteed only for LA versions, with tCDR = 0 ns and ICCDR ≤ 1500 µA (commercial) or ≤ 4000 µA (military/industrial).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (16,384 bits), dual-port SRAM with independent left/right access |
| Access Time (tRC) | 35 ns max - defines minimum read cycle interval for reliable timing margin |
| Supply Voltage | 5.0 V ±10% - single-rail TTL-compatible operation; no dual-supply required |
| Data Retention Voltage | 2.0 V min - enables battery backup without external regulators or voltage translation |
| Full Standby Current (ISB3) | 1.0 µA typ / 4 µA max - ultra-low power hold mode with all inputs at CMOS levels |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded and avionics applications |
| Input/Output Capacitance | CIN/COUT ≤ 11 pF - ensures signal integrity up to 30 MHz bus operation with standard PCB trace lengths |
Pinout & Package
Package: 48-pin Flatpack (FP48), 48-pin LCC (LC48), 48-pin DIP (PDG48/SB48), or 52-pin PLCC (PLG52). Pin functions are identical across all packages; FP48 shown below.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Must be connected to system ground plane; multiple GND pins ensure low-impedance return path |
| CER (Pin 2) | Right port chip enable | Active-low enable; deassertion places right port in standby (ISB1/ISB2/ISB4) |
| CEL (Pin 3) | Left port chip enable | Active-low enable; controls left port power state independently of right port |
| OEL (Pin 4) | Left port output enable | Active-low; enables I/O0L–I/O7L drivers during read cycles |
| A0L–A10L (Pins 5,19–29) | Left port address inputs | 11-bit address bus selecting one of 2K locations for left-side access |
| OER (Pin 30) | Right port output enable | Active-low; enables I/O0R–I/O7R drivers during right-port reads |
| A0R–A10R (Pins 31–41) | Right port address inputs | 11-bit address bus for independent right-side memory addressing |
| I/O0L–I/O7L (Pins 42–48,6–12) | Left port bidirectional data | 8-bit data bus; high-impedance when OEL or CEL inactive |
| I/O0R–I/O7R (Pins 13–20) | Right port bidirectional data | 8-bit data bus; isolated from left port; no internal contention resolution |
| BUSYL / BUSYR (Pins 15,16) | BUSY inputs | Asynchronous write-inhibit signals from external IDT7132 master; must be pulled high externally if unused |
| R/WL / R/WR (Pins 17,21) | Port direction control | Active-low write enable; high = read, low = write; no internal latching |
| VCC (Pin 22) | Power supply | 5 V ±10%; all VCC pins must be decoupled locally with 0.1 µF ceramic capacitors |
Key Features
| Feature | Design Value |
|---|---|
| Slave-only BUSY interface | Eliminates need for external arbitration logic when used with IDT7132 master in width-expanded systems |
| 2 V data retention | Enables seamless battery backup without auxiliary voltage regulation circuitry |
| Independent port power control | Per-port CE allows dynamic power gating-e.g., disable right port while left port remains active |
| TTL-compatible signaling | Direct interfacing with legacy 5 V microcontrollers, FPGAs, and ASICs without level shifters |
| Industrial temperature qualification | Validated operation from –40°C to +85°C supports deployment in harsh environmental enclosures |
Applications
| Real-Time Digital Signal Processing | Avionics Flight Control Memory |
|---|---|
Use Scenario: Simultaneous acquisition and processing of sensor data streams using dual-processor architecture with shared memory buffer. IC Role / Device Role / Timing Role: Slave RAM providing synchronized, contention-free access to 2K × 8 shared memory space between ADC capture and DSP execution units. Use Value: Eliminates software-based semaphores and reduces inter-processor latency by enabling hardware BUSY-driven write coordination via IDT7132 master. |
Use Scenario: Redundant flight control computers requiring deterministic, fault-tolerant memory sharing for state synchronization. IC Role / Device Role / Timing Role: Industrial-temperature-rated slave memory in dual-channel SRAM array with hardware arbitration and 2 V retention for safe power-fail hold. Use Value: Guarantees data persistence during brownout events and meets DO-254 timing constraints for certified airborne systems. |
| Industrial PLC I/O Buffering | Test Equipment Pattern Memory |
Use Scenario: High-speed cyclic I/O scanning where fieldbus controller writes sensor inputs while motion controller reads actuator commands from same memory block. IC Role / Device Role / Timing Role: Dual-port SRAM acting as real-time I/O exchange buffer with independent left/right port timing domains. Use Value: Enables deterministic scan cycle times (≤35 ns access) without CPU intervention or DMA arbitration overhead. |
Use Scenario: Automated test equipment generating and capturing high-speed digital patterns using parallel stimulus/response architecture. IC Role / Device Role / Timing Role: 35 ns slave RAM storing test vectors on one port while comparing results on the other port in lockstep. Use Value: Supports 28.6 MHz pattern rates (1/35 ns) with zero-cycle interlock delay between stimulus and response paths. |
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 CY7C1371DV33-166AXC | 3.3 V core, 166 MHz (6 ns) access, QDR architecture, no BUSY arbitration | Requires level-shifting for 5 V systems; lacks hardware contention management for master/slave expansion | Select only for new 3.3 V designs needing higher bandwidth; not drop-in compatible with IDT7142LA35P |
| ISSI IS61WV20488BLL-10MLI | 3.3 V, 10 ns access, single-port with burst mode, no dual-port arbitration or BUSY support | Cannot replace dual-port functionality; requires external logic for concurrent access coordination | Use only when dual-port capability is unnecessary and cost is primary constraint |
Compared with CY7C1371DV33-166AXC and IS61WV20488BLL-10MLI, the IDT7142LA35P uniquely delivers 5 V TTL-compatible dual-port operation with integrated BUSY-input slave logic-enabling seamless width expansion without FPGA-based arbitration or glue logic.
Availability
IDT7142LA35P is available at Aetrix Electronics and suitable for industrial PLC I/O buffering, avionics flight control memory, and real-time digital signal processing applications requiring stable component supply, long-term lifecycle assurance, and MIL-PRF-38535-compliant manufacturing traceability.
Supply support for IDT7142LA35P 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 power management ICs before its acquisition by Renesas Electronics in 2019. IDT's dual-port SRAM portfolio emphasized high-reliability, low-latency memory solutions for mission-critical systems.
The IDT7142LA35P belongs to IDT's legacy 71xx dual-port SRAM family, designed specifically for deterministic, contention-free memory sharing in real-time embedded systems-particularly where hardware-managed arbitration between heterogeneous processors or controllers is essential.
FAQ
What is the function of BUSYL and BUSYR on the IDT7142LA35P?
BUSYL and BUSYR are dedicated input pins on the IDT7142LA35P that accept active-low BUSY signals from an external IDT7132 master device. When asserted, they internally inhibit write operations on the corresponding port-ensuring data coherency during simultaneous access to the same memory location. Unlike the IDT7132, the IDT7142LA35P does not generate BUSY signals.
Does the IDT7142LA35P support battery backup operation?
Yes, the IDT7142LA35P supports battery backup operation with guaranteed data retention at VCC = 2.0 V, a feature exclusive to LA (low-power) variants. At this voltage, ICCDR is specified ≤1500 µA (commercial) or ≤4000 µA (industrial/military), enabling direct connection to a 2 V lithium cell without regulation.
Can the IDT7142LA35P operate as a standalone dual-port RAM without an IDT7132 master?
Yes, the IDT7142LA35P can operate as a standalone dual-port RAM. Its left and right ports function independently with full read/write capability. BUSYL and BUSYR may be tied high (via pull-up resistors) if arbitration is managed in software or not required. No master device is mandatory for basic dual-port operation.
What is the maximum operating frequency supported by the IDT7142LA35P?
The IDT7142LA35P has a maximum read cycle time (tRC) of 35 ns, supporting effective memory access rates up to 28.6 MHz (1/35 ns). This applies to both ports independently. Write cycle time (tWC) is also 35 ns max, ensuring symmetrical timing for read and write operations under worst-case conditions.
Which packages are available for the IDT7142LA35P?
The IDT7142LA35P is offered in four package types: 48-pin Flatpack (FP48), 48-pin LCC (LC48), 48-pin plastic or sidebraze DIP (PDG48/SB48), and 52-pin PLCC (PLG52). All share identical pinouts and electrical specifications; mechanical dimensions and thermal profiles differ per package type as documented in IDT's ordering information.
7142LA35P Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 48-DIP (0.600", 15.24mm)
- 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:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 4.5V ~ 5.5V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-PDIP
7142LA35P FAQ
1.How can I place an order for 7142LA35P through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA35P 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 7142LA35P reliable?
The price and inventory of 7142LA35P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA35P is usually 5 days.
3.What payment methods are accepted for 7142LA35P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA35P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA35P?
7142LA35P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA35P 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 7142LA35P?
For technical support, including 7142LA35P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA35P requirements.
6.How does Aetrix verify that 7142LA35P is sourced from the original manufacturer or authorized distributors?
All 7142LA35P 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 7142LA35P meets industry standards.
7.What is the process for return or replacement of 7142LA35P?
All 7142LA35P units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA35P, 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 7142LA35P part is unused and in its original packaging.
Return procedure for 7142LA35P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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