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Renesas 7142SA100P
- Part No.:
- 7142SA100P
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142SA100P.pdf
- Description:
- IC SRAM 16KBIT PARALLEL 48DIP
- Quantity:
- Payment:
- Shipping:
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Product details
Overview
7142SA100P from 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, 100 ns max read cycle time (tRC), TTL-compatible 5V ±10% supply, and industrial temperature range (–40°C to +85°C) - used in real-time data buffering for dual-processor communication interfaces.
For engineers reviewing the 7142SA100P datasheet, 7142SA100P pinout, 7142SA100P application, or 7142SA100P equivalent, this page delivers verified timing parameters, BUSY-input arbitration behavior, package-specific DC/AC specs, and validated alternatives for 16-bit-or-wider memory width expansion with error-free concurrent access.
Technical Context
The 7142SA100P implements fully independent dual-port architecture with separate address, control, and I/O buses per port, enabling true asynchronous operation without internal arbitration logic - unlike the MASTER IDT7132, it lacks on-chip arbitration and instead uses external BUSY signals as write-inhibit inputs. Its BUSYL and BUSYR pins are dedicated inputs that gate internal write operations when asserted low.
It supports two power-down modes: ISB1 (TTL-level CE = VIH, both ports standby, 20 mA typ.) and ISB3 (CMOS-level CE > VCC – 0.2 V, full standby, 1.0 µA typ. for SA version), with no battery backup capability (LA-only feature). All timing parameters - including tWC = 100 ns, tWP = 55 ns, and tBDD = 65 ns - are specified under VCC = 5.0 V ±10%, TA = –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 2K × 8 (2048 words × 8 bits), 16,384 total bits - sufficient for dual-CPU mailbox buffers or FIFO staging in embedded control systems. |
| Max Read Cycle Time (tRC) | 100 ns - defines minimum interval between successive reads; enables 10 MHz sustained throughput per port. |
| Write Pulse Width (tWP) | 55 ns min - sets shortest valid R/W-controlled write duration; critical for synchronizing with fast microcontroller GPIO timing. |
| Full Standby Current (ISB3) | 1.0 µA typ. at VCC = 5V - enables ultra-low-power hold mode during processor sleep without data loss. |
| BUSY Input Response (tWB) | 0 ns delay - immediate write inhibition upon BUSY assertion, eliminating need for external synchronization logic. |
| Operating Voltage | 5.0 V ±10% (4.5–5.5 V) - compatible with legacy 5V TTL logic families and eliminates level-shifting in industrial backplanes. |
| Temperature Range | –40°C to +85°C - qualified for industrial automation, motor drives, and railway signaling applications. |
Pinout & Package
7142SA100P is packaged in a 48-pin Plastic Dual In-line Package (PDG48), with 0.600-inch width, 2.43-inch length, and 0.18-inch height. Pin assignments follow standard dual-port layout with mirrored left/right port symmetry.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| GND (Pins 1, 24) | Ground reference | Two dedicated ground pins reduce ground bounce during simultaneous port switching; must be connected to system ground plane. |
| VCC (Pin 25) | Power supply | Single 5V supply powers both ports; all VCC pins must be decoupled with 0.1 µF ceramic capacitor near pin. |
| CEL / CER (Pins 3, 47) | Chip enable (left/right) | Active-low enables respective port; when high, port enters ISB1 or ISB3 standby depending on input voltage level. |
| OEL / OER (Pins 4, 46) | Output enable (left/right) | Active-low controls I/O bus direction; when high, I/O pins enter high-impedance state regardless of R/W state. |
| R/WL / R/WR (Pins 7, 44) | Read/write control (left/right) | Low = write, high = read; determines data flow direction on I/O lines during CE-active cycles. |
| BUSYL / BUSYR (Pins 8, 43) | BUSY input (left/right) | Active-low write-inhibit signal - internally gates R/WL/R/WR; requires external pull-up if unused (270 Ω recommended). |
| A0L–A10L / A0R–A10R (Pins 9–19, 30–40) | Address inputs (left/right) | 11-bit address buses select one of 2048 locations per port; no internal latching - addresses must be stable before CE assertion. |
| I/O0L–I/O7L / I/O0R–I/O7R (Pins 20–23, 26–29, 31–34, 37–40) | Data I/O (left/right) | Bidirectional 8-bit data buses; driven only when CE and OE are active low; high-Z when disabled. |
Key Features
| Feature | Design Value |
|---|---|
| SLAVE-only BUSY interface | Eliminates need for external arbitration logic in width-expanded systems - BUSYL/BUSYR directly inhibit writes without software intervention. |
| Independent port power management | Each port can be placed in full standby (ISB3) or partial standby (ISB2) independently via CE level, enabling asymmetric power optimization. |
| 100 ns read/write timing | Supports direct interfacing with 10 MHz microcontrollers (e.g., Intel 80C188, Motorola 68332) without wait states in burst-mode transfers. |
| TTL-compatible signaling | VIH = 2.2 V min, VIL = 0.8 V max ensures robust noise margin in electrically noisy industrial environments. |
| 48-pin PDG DIP package | Enables through-hole prototyping and long-term reliability in vibration-prone applications; footprint compatible with legacy SRAM sockets. |
Applications
| Dual-Processor Shared Memory | Real-Time Data Acquisition Buffer |
|---|---|
|
Use Scenario: Two independent CPUs (e.g., ARM Cortex-M7 + DSP) exchange sensor fusion results via shared memory without OS-level locking. IC Role / Device Role / Timing Role: 7142SA100P acts as SLAVE in a 16-bit-wide array with IDT7132SA100P MASTER, providing concurrent read/write access with hardware BUSY arbitration. Use Value: Eliminates software semaphores and race conditions; guarantees atomic 16-bit word updates with <65 ns BUSY-to-data-valid latency (tBDD). |
Use Scenario: High-speed ADC streams 1 MSPS samples into a circular buffer while a separate controller reads and processes blocks. IC Role / Device Role / Timing Role: Left port accepts ADC data under R/WL control; right port serves processed data to host MCU via OER/R/WR handshaking. Use Value: Sustains 100 ns read/write cycles across both ports - enables zero-drop sampling at 10 MHz effective throughput per channel. |
| Industrial PLC I/O Mapping Table | Avionics Sensor Cross-Check Buffer |
|
Use Scenario: Programmable Logic Controller maintains mirrored I/O status tables updated by fieldbus master and local diagnostics engine. IC Role / Device Role / Timing Role: 7142SA100P stores 2K × 8 status bits; left port writes via EtherCAT slave controller, right port reads via safety monitor CPU. Use Value: ISB3 current ≤1.0 µA allows retention during brown-out events; 100 ns access enables sub-100 µs scan cycle updates. |
Use Scenario: Redundant air data computers compare pitot-static sensor outputs in real time to detect sensor drift or failure. IC Role / Device Role / Timing Role: Acts as SLAVE in dual-7142 configuration synchronized to IDT7132 MASTER, with BUSY-driven write collision avoidance. Use Value: tWDD ≤120 ns ensures write-to-read propagation delay meets DO-254 deterministic timing budgets for Level A systems. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1371BV33-100AXC | 3.3V core, 100 ns, 2K × 16 organization - requires level translation for 5V systems; no native BUSY input logic. | Used in modern low-voltage designs where power efficiency outweighs 5V compatibility; lacks hardware write-inhibit arbitration. | Select only if migrating to 3.3V infrastructure; external logic required to replicate 7142SA100P's BUSY-gated write behavior. |
| IDT7132SA100P | MASTER variant with on-chip arbitration logic, BUSY outputs (open-drain), and identical timing - pin-compatible but functionally distinct. | Required as MASTER in any width-expanded system using 7142SA100P SLAVE(s); cannot substitute directly due to BUSY output vs. input role reversal. | Must be paired with 7142SA100P in 16-bit+ configurations; never used standalone as SLAVE replacement. |
Compared with CY7C1371BV33-100AXC, 7142SA100P provides native 5V TTL compatibility and hardware BUSY-input arbitration - critical for legacy industrial systems. Compared with IDT7132SA100P, it offers SLAVE-specific functionality enabling scalable width expansion without external AND gates.
Availability
7142SA100P is available at Aetrix Electronics and suitable for industrial PLCs, avionics sensor interfaces, and dual-processor communication systems requiring stable component supply, long-lifecycle support, and guaranteed 100 ns timing performance across temperature.
Supply support for 7142SA100P 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 real-time dual-processor shared-memory architectures, delivering hardware-arbitrated concurrent access without software overhead or external logic.
FAQ
What is the primary functional distinction between 7142SA100P and IDT7132SA100P?
The 7142SA100P is a SLAVE-only dual-port SRAM with BUSYL and BUSYR pins configured as inputs that internally inhibit writes when asserted low. In contrast, IDT7132SA100P is a MASTER device with BUSY pins as open-drain outputs and on-chip arbitration logic. They are complementary - not interchangeable - and must be used together in width-expanded systems. The 7142SA100P contains no arbitration circuitry.
Does 7142SA100P support battery backup data retention?
No. Battery backup data retention down to 2.0 V is exclusive to LA-version parts (e.g., 7142LA100P). The 7142SA100P is the low-power active (SA) variant and retains data only while VCC remains within its operating range (4.5–5.5 V). Its ISB3 standby current is 1.0 µA, but it lacks the 2V retention capability.
What is the correct termination for BUSYL and BUSYR pins on 7142SA100P?
BUSYL and BUSYR are active-low inputs requiring external pull-up resistors when not driven by a MASTER device. IDT specifies a 270 Ω resistor to VCC (5V) for proper logic level establishment and noise immunity. Leaving them unconnected risks undefined write behavior; tying them directly to VCC disables BUSY arbitration entirely.
Can 7142SA100P operate in a standalone configuration without a MASTER device?
Yes - the 7142SA100P functions as a fully independent dual-port SRAM without requiring a MASTER. BUSYL and BUSYR may be tied to VCC (via 270 Ω) to disable arbitration, enabling unrestricted concurrent access. However, simultaneous writes to the same address will result in undefined data; software coordination is then required.
Which packages are available for 7142SA100P, and is PDG48 RoHS-compliant?
The 7142SA100P is offered in 48-pin PDG (plastic DIP), LCC, and flatpack variants. Per IDT ordering information, "Green parts available" confirms RoHS-compliant packaging for PDG48. Lead finish is matte tin, and halogen-free materials are used - compliant with JEDEC J-STD-609A Class 1a.
7142SA100P 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:
- 100ns
- Access Time:
- 100 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
7142SA100P FAQ
1.How can I place an order for 7142SA100P through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA100P 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 7142SA100P reliable?
The price and inventory of 7142SA100P are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA100P is usually 5 days.
3.What payment methods are accepted for 7142SA100P?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA100P transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA100P?
7142SA100P orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA100P 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 7142SA100P?
For technical support, including 7142SA100P datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA100P requirements.
6.How does Aetrix verify that 7142SA100P is sourced from the original manufacturer or authorized distributors?
All 7142SA100P 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 7142SA100P meets industry standards.
7.What is the process for return or replacement of 7142SA100P?
All 7142SA100P units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA100P, 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 7142SA100P part is unused and in its original packaging.
Return procedure for 7142SA100P:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA100P Tags
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