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Home > Products > Integrated Circuits (ICs) > Memory > Memory

Renesas 7142SA35L48B

Name: 7142SA35L48B
Brand: Renesas
SKU: 7142SA35L48B
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 7142SA35L48B

Manufacturer:: Renesas

Category:: Memory

Package:: 48-LCC

Datasheet:: 7142SA35L48B.pdf

Description:: IC SRAM 16KBIT PARALLEL 48LCC

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Product details

Overview

7142SA35L48B from IDT is a 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 (tRC), TTL-compatible 5V ±10% operation, and industrial temperature range (–40°C to +85°C). It serves as the data-width-expansion companion to IDT7132SA master RAMs in 16-bit-or-wider memory subsystems for real-time digital signal processors.

For engineers reviewing the 7142SA35L48B datasheet, 7142SA35L48B pinout, 7142SA35L48B application, or 7142SA35L48B equivalent, key selection considerations include BUSY input behavior (not output), absence of on-chip arbitration logic, compatibility with IDT7132SA/LA master timing, flatpack package mechanical constraints, and industrial-grade reliability under simultaneous port contention.

Technical Context

The 7142SA35L48B implements a true dual-port SRAM architecture with fully independent left and right address/control/I/O buses, enabling concurrent access without internal arbitration-arbitration is delegated to the master IDT7132 via BUSY signaling. Its BUSY pin functions exclusively as an input to gate write operations during port contention, unlike the IDT7132's open-drain BUSY output.

It supports two distinct power-down modes: ISB1 (both ports disabled, TTL-level inputs) and ISB3 (full CMOS-level standby), achieving 25 mA typical standby current at 5V in industrial grade. The device lacks on-chip port arbitration logic and relies entirely on external BUSY coordination with a master IDT7132 for conflict resolution.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	2K × 8 (2048 words × 8 bits), providing 16 KB total storage accessible via two independent ports
Access Time (tRC)	35 ns max - defines minimum read cycle duration; enables synchronization with 28.6 MHz bus clocks
Supply Voltage	5.0 V ±10% - requires single-rail TTL-compatible supply; no separate VDDQ or I/O voltage needed
Operating Temperature	–40°C to +85°C - qualified for industrial environments; not rated for commercial or military grades
BUSY Function	Input-only - asserts write-inhibit when driven low by IDT7132 master; no internal generation capability
Power Dissipation	325 mW typical active, 25 mA ISB1 standby - enables thermal management in dense PCB layouts
Package	48-lead flatpack (FP48) - 0.75″ × 0.75″ footprint with 0.11″ height; hermetically sealed for harsh environments

Pinout & Package

48-pin flatpack (FP48) package with 0.050″ lead pitch, hermetic ceramic construction, and index mark at Pin 1. Pin 1 is top-left corner when index mark is oriented upper-left; all VCC pins (Pins 24, 48) must be decoupled locally; all GND pins (Pins 1, 25) require low-inductance ground plane connection.

Pin/Terminal	Circuit Role	Design Meaning
PIN 1	GND	Ground reference for left port control and I/O; mandatory low-impedance connection to system ground plane
PIN 2	CER	Chip Enable for right port - active-low; gates all right-port operations including address decode and I/O drivers
PIN 3	CEL	Chip Enable for left port - active-low; independent of CER; enables full left-port functionality when asserted
PIN 4	OEL	Output Enable for left port - active-low; places I/O0L–I/O7L in high-impedance state when deasserted
PIN 5	A0L	LSB address for left port - connects directly to system address bus A0; latched on CE transition
PIN 6	OER	Output Enable for right port - active-low; controls tri-state behavior of I/O0R–I/O7R
PIN 7	A0R	LSB address for right port - independent address bus; allows simultaneous access to different memory locations
PIN 8–18	A1R–A9R	Right-port address lines A1–A9 - support full 2K addressing (A0–A10); A10R is Pin 47
PIN 19–23	I/O3L–I/O7L	Upper data bits for left port - bidirectional; require external bus termination for signal integrity at 35 ns timing
PIN 24	VCC	Primary power supply - must be connected to 5V ±10% with local 0.1 µF ceramic decoupling
PIN 25	GND	Secondary ground pin - completes power loop; reduces ground bounce during simultaneous port switching
PIN 26–30	A1L–A5L	Left-port address lines A1–A5 - enable independent left-port addressing without contention with right port
PIN 31–33	I/O0L–I/O2L	Lower data bits for left port - share same electrical characteristics as I/O3L–I/O7L; support byte-wide writes
PIN 34	BUSYL	BUSY input for left port - driven low by IDT7132 master to inhibit left-port writes during contention
PIN 35	R/WL	Read/Write control for left port - high = read, low = write; synchronous with CEL and OEL timing
PIN 36	R/WR	Read/Write control for right port - independent of R/WL; enables asymmetric read/write concurrency
PIN 37	BUSYR	BUSY input for right port - driven low by IDT7132 master to block right-port write operations
PIN 38–46	I/O0R–I/O7R	Full 8-bit bidirectional data bus for right port - electrically isolated from left-port I/O; supports independent data widths
PIN 47	A10R	MSB address for right port - completes 11-bit addressing (A0–A10); required for full 2K capacity access
PIN 48	VCC	Secondary power supply pin - must be tied to same 5V rail as Pin 24; improves current distribution uniformity

Key Features

Feature	Design Value
Slave-only BUSY interface	Accepts external BUSY signals from IDT7132 master to prevent data corruption during simultaneous writes to identical addresses
Independent port control	Separate CEL/CER, OEL/OER, R/WL/R/WR, and A0L–A10L/A0R–A10R enable true concurrent access without software arbitration
Industrial temperature rating	Guaranteed operation from –40°C to +85°C - validated across full speed grade (35 ns) and supply range (4.5–5.5 V)
TTL-compatible I/O	Direct interface with 5V microcontrollers, DSPs, and FPGAs without level-shifting; VOL ≤ 0.4 V at 4 mA sink
Low-power standby modes	ISB1 (25 mA typ.) and ISB3 (1.0 mA typ.) reduce system power during idle cycles while preserving memory contents
Hermetic flatpack packaging	48-lead FP48 package resists moisture ingress and thermal cycling - suitable for avionics and industrial control enclosures

Applications

Real-Time Digital Signal Processing	Dual-Processor Inter-Processor Communication
Use Scenario: Two ADSP-2100-series DSPs sharing coefficient tables and intermediate results in a radar beamforming subsystem. IC Role / Device Role / Timing Role: 7142SA35L48B acts as slave buffer in a master/slave pair with IDT7132SA35L48B, absorbing writes from one DSP while enabling concurrent reads by the other at 35 ns latency. Use Value: Eliminates software semaphore overhead and guarantees atomic memory updates via hardware BUSY arbitration, sustaining 28.6 MHz sustained throughput per port.	Use Scenario: Asymmetric multiprocessing in an industrial PLC where ARM Cortex-A9 handles HMI and PowerPC e500 manages I/O scanning. IC Role / Device Role / Timing Role: 7142SA35L48B provides dedicated 2K×8 scratchpad for PowerPC writes while ARM reads status flags and sensor logs concurrently. Use Value: Enables lock-free communication with deterministic 35 ns read access, reducing inter-core latency below 100 ns critical threshold for motion control loops.
High-Speed Data Acquisition Buffering	Redundant Control System Memory
Use Scenario: 100 MS/s ADC front-end feeding waveform data into FPGA-based FFT engine with real-time display output. IC Role / Device Role / Timing Role: 7142SA35L48B serves as slave in dual-port FIFO configuration - FPGA writes raw samples while microcontroller reads processed frames. Use Value: Sustains 28.6 MHz continuous write/read bandwidth without pipeline stalls, preventing sample loss during burst acquisition windows.	Use Scenario: Fault-tolerant train signaling controller requiring hot-swappable redundancy with synchronized memory state. IC Role / Device Role / Timing Role: 7142SA35L48B deployed as slave in mirrored IDT7132/7142 pairs - primary master writes to both slaves simultaneously via broadcast BUSY. Use Value: Ensures sub-microsecond memory state consistency between redundant channels using hardware-enforced write inhibition during failover transitions.

Real-Time Digital Signal Processing

Dual-Processor Inter-Processor Communication

Use Scenario: Two ADSP-2100-series DSPs sharing coefficient tables and intermediate results in a radar beamforming subsystem.

IC Role / Device Role / Timing Role: 7142SA35L48B acts as slave buffer in a master/slave pair with IDT7132SA35L48B, absorbing writes from one DSP while enabling concurrent reads by the other at 35 ns latency.

Use Value: Eliminates software semaphore overhead and guarantees atomic memory updates via hardware BUSY arbitration, sustaining 28.6 MHz sustained throughput per port.

Use Scenario: Asymmetric multiprocessing in an industrial PLC where ARM Cortex-A9 handles HMI and PowerPC e500 manages I/O scanning.

IC Role / Device Role / Timing Role: 7142SA35L48B provides dedicated 2K×8 scratchpad for PowerPC writes while ARM reads status flags and sensor logs concurrently.

Use Value: Enables lock-free communication with deterministic 35 ns read access, reducing inter-core latency below 100 ns critical threshold for motion control loops.

High-Speed Data Acquisition Buffering

Redundant Control System Memory

Use Scenario: 100 MS/s ADC front-end feeding waveform data into FPGA-based FFT engine with real-time display output.

IC Role / Device Role / Timing Role: 7142SA35L48B serves as slave in dual-port FIFO configuration - FPGA writes raw samples while microcontroller reads processed frames.

Use Value: Sustains 28.6 MHz continuous write/read bandwidth without pipeline stalls, preventing sample loss during burst acquisition windows.

Use Scenario: Fault-tolerant train signaling controller requiring hot-swappable redundancy with synchronized memory state.

IC Role / Device Role / Timing Role: 7142SA35L48B deployed as slave in mirrored IDT7132/7142 pairs - primary master writes to both slaves simultaneously via broadcast BUSY.

Use Value: Ensures sub-microsecond memory state consistency between redundant channels using hardware-enforced write inhibition during failover transitions.

Equivalent & Alternatives

The following parts are listed as comparable options for similar dual-port SRAM applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C133-35PC	35 ns access, 2K × 8, but uses 52-pin PLCC package and lacks native BUSY input logic - requires external arbitration circuitry	Suitable for non-master/slave point-to-point designs where external glue logic is acceptable	Select only if FP48 footprint is not required and board space permits discrete arbitration components
IDT7134LA55J	55 ns access, 4K × 8, LA low-power variant with 2V data retention - incompatible BUSY architecture (master-only) and slower timing	Applicable only in battery-backed systems needing extended retention, not industrial real-time use	Reject for 35 ns timing-critical applications; consider only if power budget mandates <100 µA standby and retention is mandatory

Compared with CY7C133-35PC and IDT7134LA55J, the 7142SA35L48B uniquely delivers industrial-grade 35 ns dual-port performance in a hermetic flatpack with integrated BUSY-input protocol - eliminating external arbitration logic while ensuring deterministic contention resolution in master/slave configurations.

Availability

7142SA35L48B is available at Aetrix Electronics and suitable for real-time digital signal processing, dual-processor inter-processor communication, and high-speed data acquisition buffering requiring stable component supply across extended industrial temperature ranges and long production lifecycles.

Supply support for 7142SA35L48B 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 timing, memory interface, RF, and sensor solutions, now part of Renesas Electronics since 2019.

The IDT7142 product line was engineered specifically for width-expansion dual-port SRAM systems requiring hardware-managed contention resolution, targeting industrial control, aerospace, and test equipment where deterministic memory access latency is critical.

FAQ

What is the function of the BUSY pins on the 7142SA35L48B?

The BUSYL and BUSYR pins on the 7142SA35L48B serve exclusively as inputs - they receive active-low BUSY signals from an IDT7132 master device to inhibit write operations during port contention. Unlike the IDT7132, the 7142SA35L48B does not generate BUSY signals; it relies entirely on external arbitration. When either BUSYL or BUSYR is pulled low, the corresponding port's write cycle is gated internally, preventing data corruption. This behavior is hardwired and cannot be disabled or reconfigured in the 7142SA35L48B.

Can the 7142SA35L48B operate as a standalone dual-port RAM without an IDT7132 master?

Yes, the 7142SA35L48B can operate as a standalone dual-port RAM without an IDT7132 master, but only in non-contention scenarios. Its left and right ports support fully independent read/write operations when accessing different memory addresses. However, if both ports attempt to write to the same location simultaneously, no hardware arbitration occurs - the result is undefined and potentially destructive. For guaranteed safe concurrent access to identical addresses, an IDT7132 master must drive the BUSY inputs. The 7142SA35L48B itself contains no arbitration logic.

What are the power supply requirements for reliable operation of the 7142SA35L48B?

The 7142SA35L48B requires a single 5.0 V ±10% (4.5–5.5 V) TTL-compatible supply applied to both VCC pins (Pins 24 and 48), with each pin decoupled using a 0.1 µF ceramic capacitor placed within 5 mm of the pin. All GND pins (Pins 1 and 25) must connect to a low-inductance ground plane. Exceeding 5.5 V risks permanent damage, while operation below 4.5 V invalidates timing specifications and may cause data retention failure. The device draws up to 110 mA dynamic current and 25 mA in ISB1 standby mode at industrial temperature extremes.

How does the 7142SA35L48B differ from the IDT7132SA35L48B in pin compatibility and functionality?

The 7142SA35L48B and IDT7132SA35L48B share identical pinouts and package dimensions (FP48), enabling direct PCB footprint reuse. However, their BUSY pin functionality is inverted: on the 7142SA35L48B, BUSYL/BUSYR are inputs that accept arbitration signals, whereas on the IDT7132SA35L48B, they are open-drain outputs requiring 270 Ω pull-up resistors. Additionally, the IDT7132SA35L48B contains on-chip arbitration logic and generates BUSY signals, while the 7142SA35L48B has no arbitration circuitry and relies entirely on external BUSY control.

Is the 7142SA35L48B suitable for battery backup applications?

No, the 7142SA35L48B is not suitable for battery backup applications. It belongs to the "SA" (Standard Active) series, not the "LA" (Low-power Active) series. Only LA variants (e.g., 7142LA35L48B) support 2V data retention with microamp-level standby current. The 7142SA35L48B requires continuous 4.5–5.5 V operation and exhibits 25 mA ISB1 standby current - far exceeding practical battery backup limits. Attempting to operate the 7142SA35L48B below 4.5 V risks data loss and violates absolute maximum ratings.

7142SA35L48B Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 48-LCC

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:: Surface Mount

Supplier Device Package:: 48-LCC (14.22x14.22)

7142SA35L48B FAQ

1.How can I place an order for 7142SA35L48B through Aetrix?

Please submit a Request for Quotation (RFQ) for 7142SA35L48B 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 7142SA35L48B reliable?

The price and inventory of 7142SA35L48B are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7142SA35L48B is usually 5 days.

3.What payment methods are accepted for 7142SA35L48B?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7142SA35L48B transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 7142SA35L48B?

7142SA35L48B orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 7142SA35L48B 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 7142SA35L48B?

For technical support, including 7142SA35L48B datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7142SA35L48B requirements.

6.How does Aetrix verify that 7142SA35L48B is sourced from the original manufacturer or authorized distributors?

All 7142SA35L48B 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 7142SA35L48B meets industry standards.

7.What is the process for return or replacement of 7142SA35L48B?

All 7142SA35L48B units undergo pre-shipment inspection (PSI). If there is an issue with 7142SA35L48B, 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 7142SA35L48B part is unused and in its original packaging.

Return procedure for 7142SA35L48B:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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