My Inquiry
My Account
Renesas 7142SA35CB
- Part No.:
- 7142SA35CB
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 48-DIP (0.600", 15.24mm)
- Datasheet:
-
7142SA35CB.pdf
- Description:
- IC SRAM 16KBIT PARALLEL SB48
- Quantity:
- Payment:
- Shipping:
Inventory:2,883
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
7142SA35CB from IDT is a high-speed 2K × 8 dual-port static RAM configured as a SLAVE device in MASTER/SLAVE memory expansion systems, featuring 35 ns maximum read/write cycle time, TTL-compatible 5V ±10% operation, and BUSY input functionality for port arbitration - used in real-time embedded control buffers requiring simultaneous independent access to shared memory.
For engineers reviewing the 7142SA35CB datasheet, 7142SA35CB pinout, 7142SA35CB application, or 7142SA35CB equivalent, key selection considerations include its role as a SLAVE in width-expanded 16-bit+ systems, BUSY-input timing constraints (tWB = 0 ns), industrial temperature support (–40°C to +85°C), and compatibility with IDT7132SA35CB master devices.
Technical Context
The 7142SA35CB implements fully asynchronous dual-port architecture with independent left/right address, control, and I/O buses, enabling concurrent read/write operations without internal synchronization overhead. Its BUSY pin functions strictly as an input (unlike the open-drain BUSY output on IDT7132), directly gating write cycles when asserted low during address contention.
It supports CE-controlled and R/W-controlled write timing modes, with guaranteed tWC = 35 ns, tWP = 25 ns, and tBDD = 35 ns (BUSY disable to valid data), and operates with full CMOS-level standby current (ISB3 = 1.0 mA typ., 15 µA max) under VCC ≥ 4.8 V and all inputs at rail.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Size | 2K × 8 bits (2048 words × 8-bit wide), providing 16 KB addressable space per port |
| Access Time | 35 ns max (tAA, tACE, tAOE), enabling 28.6 MHz sustained random access in synchronous bus interfaces |
| Supply Voltage | 5.0 V ±10% (4.5–5.5 V), compatible with legacy TTL and mixed-signal 5V system rails |
| Operating Temp | –40°C to +85°C (industrial grade), validated for extended thermal cycling in motor control and avionics subsystems |
| Standby Current | 1.0 mA typical (ISB3), <15 µA max with CMOS-level inputs - enables low-power sleep states in battery-backed systems |
| BUSY Function | Input-only (not output); asserts internal write inhibit when low - requires external master (e.g., IDT7132) to drive signal |
| Package | 48-pin ceramic LCC (LC48), hermetically sealed, 0.57″ × 0.57″ footprint, suitable for high-reliability PCB layouts |
Pinout & Package
48-pin ceramic leadless chip carrier (LC48) package with 0.050″ pitch, side-brazed construction, and index mark at Pin 1 corner. Pin 1 is marked by a dot or beveled edge; all VCC pins (Pins 24, 48) must be decoupled locally, and all GND pins (Pins 1, 25) require low-inductance grounding.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| A0L–A10L | Left-port address inputs | 11-bit address bus for left-side memory access; latched on CE or R/W transition |
| A0R–A10R | Right-port address inputs | Independent 11-bit address bus for right-side access; no internal aliasing with left port |
| I/O0L–I/O7L | Left-port bidirectional data | 8-bit tristate I/O; direction controlled by R/WL and OEL; high-impedance when OEL = VIH or CEL = VIH |
| I/O0R–I/O7R | Right-port bidirectional data | 8-bit tristate I/O; independent of left port; supports byte-wide writes via R/WR control |
| CEL / CER | Chip enable (active low) | Port-select enable; deassertion forces respective port into ISB1/ISB2 standby mode (≤30 mA) |
| OEL / OER | Output enable (active low) | Controls I/O drivers only; does not affect internal memory state or power mode |
| R/WL / R/WR | Read/write control (active low) | Defines data direction per port; write occurs only when CE and R/W both low |
| BUSYL / BUSYR | BUSY input (SLAVE mode) | Asynchronous write-inhibit signals - low level blocks writes to corresponding port regardless of CE/R/W state |
| VCC (Pins 24, 48) | Power supply | Must be connected to 4.5–5.5 V with local 0.1 µF + 10 µF decoupling; both pins required for current sharing |
| GND (Pins 1, 25) | Ground reference | Low-impedance return path for both ports; tie to system ground plane with multiple vias |
Key Features
| Feature | Design Value |
|---|---|
| Dual-port arbitration via BUSY input | Enables deterministic resolution of simultaneous same-address accesses - eliminates software polling or lock-based synchronization in real-time firmware |
| 35 ns cycle time with full timing guarantees | Meets worst-case tRC, tWC, and tBDD specs across –40°C to +85°C, supporting deterministic latency in motion control loops |
| CMOS-level full-standby mode (ISB3) | Draws ≤15 µA with all inputs at VCC–0.2V or GND - extends battery life in maintenance-free field instruments |
| Industrial-grade ceramic LCC packaging | Hermetic seal and coefficient-of-thermal-expansion matched to FR4, ensuring reliability in vibration-prone industrial enclosures |
| TTL-compatible interface | Accepts standard 5V logic thresholds (VIH ≥ 2.2 V, VIL ≤ 0.8 V) - interoperates with legacy microcontrollers and FPGAs without level shifters |
Applications
| Motor Control Buffer Memory | Digital Signal Processor Co-Processor Interface |
|---|---|
Use Scenario: Real-time exchange of position setpoints and feedback samples between MCU and FPGA in servo drives. IC Role / Device Role / Timing Role: SLAVE dual-port RAM synchronizing 16-bit command streams and 32-bit encoder data across clock domains. Use Value: Eliminates FIFO depth uncertainty and handshake overhead - enables sub-100 ns inter-processor data transfer with hardware arbitration. |
Use Scenario: Shared instruction/data buffer between DSP and host ARM processor in radar signal processing modules. IC Role / Device Role / Timing Role: Width-expanded 16-bit memory node (with IDT7132SA35CB master) serving dual-core memory requests. Use Value: Sustains 28.6 MHz burst reads/writes without wait states - critical for FFT pipeline throughput in airborne SAR systems. |
| Avionics Data Acquisition Buffer | Industrial PLC Dual-CPU Communication Link |
Use Scenario: Capturing synchronized analog sensor samples across redundant flight computers in DO-254-compliant systems. IC Role / Device Role / Timing Role: SLAVE RAM receiving ADC data from master CPU while feeding watchdog and health-monitoring cores. Use Value: Hardware BUSY arbitration prevents corrupted sample writes during cross-channel diagnostics - satisfies AS6019 fault containment requirements. |
Use Scenario: Interlocking safety logic and motion control tasks executing on separate PLC CPUs sharing I/O status tables. IC Role / Device Role / Timing Role: Dual-port SRAM acting as atomic memory-mapped mailbox with deterministic write-inhibit behavior. Use Value: Guarantees data coherency without software locks - reduces worst-case task jitter from >10 µs to fixed 35 ns arbitration latency. |
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 CY7C136-35JC | 35 ns access, 2K × 8, but uses active-high BUSY output and lacks dedicated SLAVE arbitration logic | Requires external logic to convert BUSY output to input; incompatible with IDT7132/7142 width-expansion topology | Select only if redesigning arbitration circuitry and accepting added board area/cost for discrete AND gates |
| ISSI IS61LV25616AL-10TLI | 10 ns access, 16K × 16, but single-port with external bus controller - no native dual-port arbitration | Needs companion CPLD/FPGA for port arbitration; increases BOM count and firmware complexity | Choose only when higher density and speed outweigh deterministic latency and hardware simplicity requirements |
Compared with CY7C136-35JC and IS61LV25616AL-10TLI, the 7142SA35CB delivers native SLAVE-mode BUSY input behavior, eliminating external glue logic and guaranteeing timing-compliant width expansion with IDT7132 masters - essential for safety-critical deterministic memory sharing.
Availability
7142SA35CB is available at Aetrix Electronics and suitable for motor control buffer memory, digital signal processor co-processor interface, and avionics data acquisition buffer applications requiring stable component supply, long-term obsolescence management, and industrial-temperature qualified dual-port SRAMs.
Supply support for 7142SA35CB 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 family was designed specifically for deterministic, low-latency dual-port memory expansion in real-time embedded systems - prioritizing hardware arbitration, industrial temperature resilience, and seamless MASTER/SLAVE interoperability over density or ultra-low power.
FAQ
What is the function of BUSYL and BUSYR on the 7142SA35CB?
On the 7142SA35CB, BUSYL and BUSYR are dedicated input-only pins that internally inhibit write operations to the left or right port when driven low. Unlike the IDT7132 master, these pins do not output BUSY signals - they rely on an external master (e.g., IDT7132SA35CB) to drive them. This design ensures deterministic arbitration in width-expanded memory systems without requiring additional logic gates. The 7142SA35CB will not perform any write if its corresponding BUSY input is low, regardless of CE or R/W state.
Can the 7142SA35CB operate as a standalone dual-port RAM without a master device?
Yes, the 7142SA35CB can operate as a standalone dual-port RAM, but only in non-contention scenarios where left and right ports never access the same address simultaneously. Since it lacks on-chip arbitration logic, BUSY inputs must be held high (via pull-up resistors or external logic) to enable writes. For robust contention handling, pairing with an IDT7132SA35CB master is required - the 7142SA35CB's BUSY inputs are specifically intended for this MASTER/SLAVE configuration.
What is the maximum operating frequency supported by the 7142SA35CB?
The 7142SA35CB supports a maximum read/write cycle time of 35 ns, corresponding to a theoretical maximum sustained operation at 28.6 MHz. This is guaranteed across the full industrial temperature range (–40°C to +85°C) and 4.5–5.5 V supply. Actual achievable frequency depends on board layout, signal integrity, and timing margins - especially for tBDD (BUSY disable to valid data = 35 ns max) and tWP (write pulse width = 25 ns min), which constrain minimum pulse widths in R/W-controlled writes.
Does the 7142SA35CB support battery backup or data retention mode?
No, the 7142SA35CB does not support battery backup or low-voltage data retention. That capability is exclusive to the LA variant (e.g., 7142LA35CB), which specifies VDR = 2.0 V and ICCDR ≤ 1500 µA (commercial) for data retention. The 7142SA35CB is a high-speed, standard-power device - its ISB3 standby current is 1.0 mA typical, and it requires continuous 5V supply to retain data. Using it with a backup battery will not preserve memory contents.
Which packages are available for the 7142SA35CB, and is the LC48 pinout identical to other variants?
The 7142SA35CB is available in the 48-pin ceramic LCC (LC48) package, as confirmed by the pin configuration diagrams and ordering information. Its LC48 pinout is identical across all 7142SA/X35 variants - including signal mapping, power/ground pin locations (Pins 1, 24, 25, 48), and BUSY pin assignments (Pins 11 and 23). This ensures drop-in compatibility when upgrading speed grades or sourcing from alternate distributors, provided the temperature grade (industrial) and power variant (SA) match.
7142SA35CB 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:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 48-SIDE BRAZED
7142SA35CB FAQ
1.How can I place an order for 7142SA35CB through Aetrix?
Please submit a Request for Quotation (RFQ) for 7142SA35CB 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 7142SA35CB reliable?
The price and inventory of 7142SA35CB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA35CB is usually 5 days.
3.What payment methods are accepted for 7142SA35CB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA35CB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 7142SA35CB?
7142SA35CB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 7142SA35CB 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 7142SA35CB?
For technical support, including 7142SA35CB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA35CB requirements.
6.How does Aetrix verify that 7142SA35CB is sourced from the original manufacturer or authorized distributors?
All 7142SA35CB 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 7142SA35CB meets industry standards.
7.What is the process for return or replacement of 7142SA35CB?
All 7142SA35CB units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA35CB, 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 7142SA35CB part is unused and in its original packaging.
Return procedure for 7142SA35CB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
7142SA35CB Tags
-
M24C02-WMN6TP
STMicroelectronics
-
AT24C02C-XHM-T
Microchip Technology
-
AT21CS01-STUM10-T
Microchip Technology
-
AT24C02C-SSHM-T
Microchip Technology
-
24LC01BT-I/OT
Microchip Technology
-
M24C02-FMC6TG
STMicroelectronics
-
AT24CS02-SSHM-T
Microchip Technology
-
93LC46BT-I/OT
Microchip Technology
-
AT24C04C-SSHM-T
Microchip Technology
-
24LC01BT-I/SN
Microchip Technology
-
24AA02UIDT-I/OT
Microchip Technology
-
AT24C08C-STUM-T
Microchip Technology
Tech Hub
TTL and CMOS logic families differ in thresholds, loading, output drive, power and timing. This engineering guide compares 74HC and 74HCT, calculates noise margins and checks 3.3 V/5 V compatibility.
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
