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Renesas 7142LA55P
- Part No.:
- 7142LA55P
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142LA55P.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 48DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,303
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Product details
Overview
IDT7142LA55P 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 55 ns maximum read cycle time, 55 ns write cycle time, and 1 µA full-standby current at 5 V - deployed in real-time industrial control buffers and military-grade avionics data exchange modules.
For engineers reviewing the IDT7142LA55P datasheet, IDT7142LA55P pinout, IDT7142LA55P application, or IDT7142LA55P equivalent, key selection considerations include its BUSY-input-only arbitration interface, battery-backed 2 V data retention capability, industrial temperature range (–40°C to +85°C), and compatibility with IDT7132LA master devices for 16-bit-or-wider word-width expansion without external logic.
Technical Context
The IDT7142LA55P implements fully independent dual-port architecture with separate address, control, and I/O buses per port, enabling concurrent access to any memory location. Its BUSY pin functions exclusively as an input for write-inhibit arbitration - unlike the IDT7132 master - and requires no internal pull-up since it receives open-drain BUSY signals from a companion IDT7132 device.
It features automatic power-down via CE-controlled standby modes: ISB3 = 0.2 mA typ. (both ports fully CMOS-disabled) and ISB4 = 40 mA typ. (one port active, one fully disabled), with TTL-compatible 5 V ±10% supply and 2 V data retention during battery backup operation - a capability exclusive to LA variants.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), 16,384 total bits |
| Max Read Cycle Time (tRC) | 55 ns - defines minimum interval between successive reads on same port |
| Max Write Cycle Time (tWC) | 55 ns - sets shortest allowable duration for complete write operation |
| Full Standby Current (ISB3) | 0.2 mA typical at 5 V - enables ultra-low-power battery backup mode |
| Data Retention Voltage | 2.0 V minimum - preserves stored data during main power loss |
| Operating Temperature | –40°C to +85°C - qualified for industrial environments without derating |
| Supply Voltage | 4.5 V to 5.5 V - compatible with standard TTL/CMOS 5 V rails |
Pinout & Package
Package: 48-pin Flatpack (FP48), hermetically sealed, 0.75 in × 0.75 in × 0.11 in body size, suitable for high-reliability military and aerospace PCBs.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pin 1) | Ground reference | Common return path for both ports; all GND pins must be connected |
| CER (Pin 2) | Right port chip enable | Active-low enable for right port address decoding and I/O drivers |
| CEL (Pin 3) | Left port chip enable | Active-low enable for left port address decoding and I/O drivers |
| OEL (Pin 4) | Left port output enable | Active-low control for left port I/O drivers (high-Z when deasserted) |
| A0L–A10L (Pins 5,19–20,22–29,31–32,43) | Left port address inputs | 11-bit address bus selecting one of 2048 memory locations |
| OER (Pin 6) | Right port output enable | Active-low control for right port I/O drivers (high-Z when deasserted) |
| A0R–A10R (Pins 7,11–18,21,23–26,33–34,44–45) | Right port address inputs | 11-bit address bus independent of left port |
| I/O0L–I/O7L (Pins 8–9,12–13,35–36,46–47) | Left port bidirectional data | 8-bit parallel data path; direction controlled by R/WL and OE states |
| R/WL (Pin 10) | Left port read/write control | High = read, low = write; controls internal data path direction |
| R/WR (Pin 14) | Right port read/write control | High = read, low = write; independent timing from left port |
| I/O0R–I/O7R (Pins 15–16,27–28,37–38,48,41–42) | Right port bidirectional data | 8-bit parallel data path synchronized only to right port controls |
| BUSYL (Pin 30) | Left port BUSY input | Open-drain signal from IDT7132 master; asserts write-inhibit when low |
| BUSYR (Pin 39) | Right port BUSY input | Open-drain signal from IDT7132 master; asserts write-inhibit when low |
| VCC (Pin 40) | Power supply | 5 V ±10% primary supply; all VCC pins must be connected |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY input | Enables deterministic conflict resolution in shared-memory systems without software overhead |
| 2 V battery backup data retention | Maintains stored contents during main power failure - unique to LA variant |
| Independent port power management | Each port enters low-power standby (ISB2/ISB4) when CE = VIH, reducing system-level power |
| TTL-compatible 5 V operation | Direct interface with legacy microcontrollers and FPGAs without level-shifting |
| Industrial temperature qualification | Guaranteed functionality across –40°C to +85°C ambient without derating |
Applications
| Industrial Motion Controller Buffer | Military Avionics Data Exchange |
|---|---|
Use Scenario: Real-time coordination between servo position loop (left port) and trajectory planner (right port) in CNC machine controllers. IC Role / Device Role / Timing Role: SLAVE dual-port RAM providing zero-latency, contention-free memory access for simultaneous motion command and feedback update. Use Value: Eliminates CPU polling or interrupt latency by enabling hardware-arbitrated concurrent access with 55 ns cycle time. |
Use Scenario: Cross-channel data synchronization between flight control computer and sensor fusion module in UAV autopilot systems. IC Role / Device Role / Timing Role: SLAVE memory node receiving validated telemetry from master IDT7132 under BUSY arbitration during high-G maneuvers. Use Value: Ensures deterministic write-inhibit behavior during transient voltage dips, preserving integrity of critical navigation state variables. |
| Telecom Line Card Packet Buffer | Medical Imaging Frame Store |
Use Scenario: Temporary storage of Ethernet frames between MAC layer (left port) and PHY interface (right port) in carrier-grade line cards. IC Role / Device Role / Timing Role: Dual-port SRAM acting as non-blocking FIFO buffer with independent read/write clocks and BUSY-driven backpressure. Use Value: Prevents packet loss during burst traffic by allowing simultaneous ingress/egress at wire speed with 55 ns access. |
Use Scenario: Storing uncompressed ultrasound image frames during acquisition and post-processing in portable diagnostic equipment. IC Role / Device Role / Timing Role: SLAVE memory holding frame data while master IDT7132 handles DMA transfers to host processor. Use Value: Enables battery-powered operation with 2 V data retention, preserving patient images during unexpected shutdown. |
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 CY7C136-55JC | 55 ns access, 2K × 8, but uses active-high BUSY and lacks 2 V data retention | Requires external pull-ups and cannot support battery backup mode | Select when BUSY polarity compatibility with existing IDT7132 master is not required and backup power is unavailable |
| ISSI IS61LV25616AL-10TLI | 10 ns faster (10 ns tRC), but single-port only and no BUSY arbitration logic | Needs external FPGA-based arbitration and dual-clock domain handling | Select only if system design allows replacing hardware arbitration with programmable logic and higher speed justifies added complexity |
Compared with CY7C136-55JC and IS61LV25616AL-10TLI, IDT7142LA55P uniquely delivers integrated BUSY-input arbitration and guaranteed 2 V data retention in a drop-in SLAVE configuration - essential for deterministic real-time systems requiring zero-software-contention resolution and fail-safe memory persistence.
Availability
IDT7142LA55P is available at Aetrix Electronics and suitable for industrial motion control, military avionics, and telecom infrastructure applications requiring stable component supply, long-term lifecycle assurance, and traceable sourcing for high-reliability deployments.
Supply support for IDT7142LA55P 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) is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.
IDT7142LA55P belongs to the IDT7132/7142 dual-port SRAM product line, designed specifically for deterministic, low-latency shared-memory architectures in real-time embedded systems where hardware arbitration and battery-backed data integrity are mandatory.
FAQ
What is the function of the BUSY pins on IDT7142LA55P?
The BUSYL and BUSYR pins on IDT7142LA55P serve exclusively as inputs - not outputs - and receive open-drain BUSY signals from a master IDT7132 device. When asserted low, they internally inhibit write operations on the corresponding port, ensuring deterministic arbitration in shared-memory systems. This behavior is fixed and cannot be reconfigured.
Does IDT7142LA55P support battery backup operation?
Yes, IDT7142LA55P supports battery backup operation with guaranteed data retention at VCC = 2.0 V, a feature exclusive to LA variants. The device draws ≤4000 µA (military/industrial) or ≤1500 µA (commercial) in data retention mode, enabling reliable memory persistence during main power loss without external circuitry.
Can IDT7142LA55P operate as a standalone dual-port RAM without a master device?
Yes, IDT7142LA55P can operate as a standalone dual-port RAM with independent left/right port access. However, BUSY arbitration is disabled unless connected to an IDT7132 master - meaning simultaneous writes to the same address will result in undefined data. For contention-free operation, pairing with IDT7132LA55P is required.
What package types are available for IDT7142LA55P?
IDT7142LA55P is offered in 48-pin Flatpack (FP48), 48-pin LCC (LC48), and 48-pin DIP (PDG48/SB48) packages. The FP48 variant - used in the IDT7142LA55P part number - provides hermetic sealing and thermal performance suited for extended industrial and military temperature operation.
How does IDT7142LA55P differ from IDT7132LA55P in system integration?
IDT7142LA55P is a SLAVE-only device with BUSY inputs and no on-chip arbitration logic, whereas IDT7132LA55P is a MASTER with BUSY outputs and internal port arbitration. In expansion systems, IDT7142LA55P must be paired with IDT7132LA55P to form a coherent 16-bit-or-wider memory array - IDT7142LA55P cannot substitute for IDT7132LA55P or vice versa.
7142LA55P 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:
- 55ns
- Access Time:
- 55 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
7142LA55P FAQ
1.How can I place an order for 7142LA55P through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142LA55P 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 7142LA55P reliable?
The price and inventory of 7142LA55P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142LA55P is usually 5 days.
3.What payment methods are accepted for 7142LA55P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142LA55P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142LA55P?
7142LA55P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142LA55P 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 7142LA55P?
For technical support, including 7142LA55P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142LA55P requirements.
6.How does Aetrix verify that 7142LA55P is sourced from the original manufacturer or authorized distributors?
All 7142LA55P 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 7142LA55P meets industry standards.
7.What is the process for return or replacement of 7142LA55P?
All 7142LA55P units undergo pre-shipment inspection (PSI). If there is an issue with 7142LA55P, 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 7142LA55P part is unused and in its original packaging.
Return procedure for 7142LA55P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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