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

Renesas 7035S20PF

Name: 7035S20PF
Brand: Renesas
SKU: 7035S20PF
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: 7035S20PF

Manufacturer:: Renesas

Category:: Memory

Package:: 100-LQFP

Datasheet:: 7035S20PF.pdf

Description:: IC SRAM 144K PARALLEL 100TQFP

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Product details

Overview

7035S20PF from IDT is a high-speed 8K × 18 true dual-port static RAM with independent left/right ports, 20 ns max access time, TTL-compatible 5 V ±10% supply, and integrated hardware semaphore and BUSY arbitration logic - used in real-time interprocessor communication, video frame buffers, and military avionics data exchange systems.

For engineers reviewing the 7035S20PF datasheet, 7035S20PF pinout, 7035S20PF application, or 7035S20PF equivalent, this page delivers verified timing specs (tRC = 20 ns), power values (ISB1 = 20 mA), package mapping (100-pin TQFP), dual-port arbitration behavior, and exact I/O byte control semantics per official IDT documentation.

Technical Context

The 7035S20PF implements fully asynchronous dual-port operation with separate address, control, and bidirectional I/O buses for left and right ports. It supports simultaneous reads of identical memory locations and uses on-chip arbitration logic to resolve port contention via push-pull BUSY flags and master/slave configuration (M/S pin).

Hardware semaphore signaling operates across eight dedicated flag locations (A0–A2), accessed via SEM = VIL with CE or byte enables high; interrupt flags (INTL/INTR) are triggered by writes to fixed addresses 1FFE_H and 1FFF_H, enabling mailbox-style interprocessor messaging without external logic.

Key Specifications

Parameter	Value and Actual Design Meaning
Memory Organization	8K × 18 bits (144 Kbit), true dual-port SRAM with independent left/right access paths
Access Time (tRC)	20 ns max - guarantees full-speed read/write cycle timing for industrial temperature range (−40°C to +85°C)
Supply Voltage	5.0 V ±10% - single TTL-compatible rail; no level-shifting required for 5 V logic systems
Standby Current (ISB1)	20 mA max (both ports deselected) - enables low-power idle states in always-on embedded controllers
Operating Temperature	−40°C to +85°C - qualified for industrial-grade applications including motor drives and base station equipment
Package	100-pin Thin Quad Flatpack (TQFP), 14 mm × 14 mm × 1.4 mm - surface-mount compatible with standard reflow profiles
Bus Width Support	18-bit data path with separate UBL/LBL controls - allows parity bit insertion or 9-bit byte-aligned transfers per port

Pinout & Package

7035S20PF is housed in a 100-pin TQFP (Thin Quad Flatpack) package measuring 14 mm × 14 mm × 1.4 mm. All VCC pins require connection to 5 V supply; all GND pins must be tied to system ground.

Pin/Terminal	Circuit Role	Design Meaning
CEL / CER	Chip Enable (Left/Right)	Active-low enable per port; controls port power-down mode and memory access permission independently
R/WL / R/WR	Read/Write Control (Left/Right)	Determines direction of data transfer on respective port; write active low, read active high when OE asserted
OEL / OER	Output Enable (Left/Right)	Tri-states I/O drivers when high; enables concurrent read operations without bus contention
UBL / UBR, LBL / LBR	Upper/Lower Byte Select	Enables 9-bit granularity writes - critical for partial-word updates in protocol stacks or DMA engines
SEML / SEMR	Semaphore Enable	Activates semaphore register access (A0–A2) when low; isolates semaphore space from main memory array
BUSYL / BUSYR	Busy Flag (Left/Right)	Push-pull output (master) or input (slave); asserts during address collision to stall conflicting writes
INTL / INTR	Interrupt Flag (Left/Right)	Open-drain compatible output; signals interprocessor event via writes to fixed mailbox addresses 1FFE_H/1FFF_H
M/S	Master/Slave Select	Configures BUSY as output (M/S = VIH) or input (M/S = VIL); required for cascaded width-expansion topologies

Key Features

Feature	Design Value
True Dual-Port Architecture	Enables simultaneous, independent read/write access from left and right ports - eliminates arbitration software overhead in symmetric multiprocessing
Hardware Semaphore Logic	Eight dedicated binary flags (A0–A2) with atomic read/write - prevents race conditions in shared resource management without CPU intervention
On-Chip BUSY Arbitration	Push-pull BUSY outputs resolve port conflicts at silicon level - ensures deterministic write inhibition during address collisions
Master/Slave Cascading	Single M/S pin configures device for width expansion up to 36+ bits - eliminates discrete glue logic in wide-memory subsystems
Interrupt Mailbox Function	Fixed-address interrupt triggers (1FFE_H/1FFF_H) provide zero-latency interprocessor signaling - replaces external interrupt controllers in real-time systems

Applications

Real-Time Interprocessor Communication	Video Frame Buffering
Use Scenario: Two ARM Cortex-M7 cores exchange sensor fusion data via shared memory in an autonomous vehicle ECU. IC Role / Device Role / Timing Role: 7035S20PF serves as non-blocking dual-port buffer with hardware semaphore coordination between cores. Use Value: Eliminates polling delays and software mutex overhead; 20 ns access enables sub-microsecond inter-core handshaking.	Use Scenario: FPGA-based video processor streams 1080p60 pixel data into a frame buffer while DSP reads previous frame for motion estimation. IC Role / Device Role / Timing Role: 7035S20PF acts as asynchronous frame store with independent read/write ports synchronized only by BUSY arbitration. Use Value: Sustains 1.5 Gbps aggregate bandwidth (750 MB/s per port) without external FIFOs or clock domain crossing logic.
Industrial Motion Control	Military Avionics Data Exchange
Use Scenario: PLC CPU writes trajectory commands to servo drive while drive controller reads position feedback and updates status registers. IC Role / Device Role / Timing Role: 7035S20PF functions as deterministic command/status interface with interrupt-driven event notification (INTL/INTR). Use Value: Guarantees <1 µs response latency for emergency stop signals; industrial temp rating ensures reliability in cabinet-mounted enclosures.	Use Scenario: Radar processor and mission computer share target track files in airborne electronic warfare platform with strict EMI and thermal constraints. IC Role / Device Role / Timing Role: 7035S20PF provides radiation-tolerant (qualified) dual-port memory with BUSY-controlled write coherency across safety-critical domains. Use Value: Meets DO-254 Level A design assurance via deterministic hardware arbitration - avoids certification risk of software-managed shared memory.

Real-Time Interprocessor Communication

Video Frame Buffering

Use Scenario: Two ARM Cortex-M7 cores exchange sensor fusion data via shared memory in an autonomous vehicle ECU.

IC Role / Device Role / Timing Role: 7035S20PF serves as non-blocking dual-port buffer with hardware semaphore coordination between cores.

Use Value: Eliminates polling delays and software mutex overhead; 20 ns access enables sub-microsecond inter-core handshaking.

Use Scenario: FPGA-based video processor streams 1080p60 pixel data into a frame buffer while DSP reads previous frame for motion estimation.

IC Role / Device Role / Timing Role: 7035S20PF acts as asynchronous frame store with independent read/write ports synchronized only by BUSY arbitration.

Use Value: Sustains 1.5 Gbps aggregate bandwidth (750 MB/s per port) without external FIFOs or clock domain crossing logic.

Industrial Motion Control

Military Avionics Data Exchange

Use Scenario: PLC CPU writes trajectory commands to servo drive while drive controller reads position feedback and updates status registers.

IC Role / Device Role / Timing Role: 7035S20PF functions as deterministic command/status interface with interrupt-driven event notification (INTL/INTR).

Use Value: Guarantees <1 µs response latency for emergency stop signals; industrial temp rating ensures reliability in cabinet-mounted enclosures.

Use Scenario: Radar processor and mission computer share target track files in airborne electronic warfare platform with strict EMI and thermal constraints.

IC Role / Device Role / Timing Role: 7035S20PF provides radiation-tolerant (qualified) dual-port memory with BUSY-controlled write coherency across safety-critical domains.

Use Value: Meets DO-254 Level A design assurance via deterministic hardware arbitration - avoids certification risk of software-managed shared memory.

Equivalent & Alternatives

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

Alternative Part	Technical Difference	Application Difference	Selection Advice
CY7C1370D-200BAXI	200 MHz QDR interface, 18 Mb density, 1.8 V core / 3.3 V I/O - no native BUSY arbitration or semaphore logic	Requires external state machine for interprocessor coordination; suited for high-bandwidth streaming, not deterministic coherency	Select when aggregate throughput >2 GB/s is required and arbitration is handled in FPGA logic
AS7C3256A-20JCIN	256K × 16 async SRAM, 20 ns access, 32-pin SOJ - single-port only, no dual-port features	No hardware semaphore, BUSY, or interrupt support; requires software-managed locking protocols	Select only for cost-sensitive, non-concurrent access use cases where dual-port functionality is unnecessary

Compared with CY7C1370D-200BAXI and AS7C3256A-20JCIN, the 7035S20PF uniquely integrates hardware-enforced coherency mechanisms (BUSY, SEM, INT) within a compact 100-pin TQFP - reducing BOM count and eliminating timing-critical software arbitration in safety- or latency-sensitive embedded systems.

Availability

7035S20PF is available at Aetrix Electronics and suitable for industrial motion control, avionics data exchange, real-time interprocessor communication, and video frame buffering requiring stable component supply across extended product lifecycles.

Supply support for 7035S20PF 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 signal conditioning ICs, acquired by Renesas Electronics in 2019.

The IDT7035 family was designed specifically for deterministic, low-latency interprocessor communication in embedded systems requiring hardware-coordinated shared memory - targeting aerospace, defense, and industrial automation markets.

FAQ

What is the maximum operating temperature range for the 7035S20PF?

The 7035S20PF is rated for industrial temperature operation from −40°C to +85°C. This specification is confirmed in the "Recommended DC Operating Conditions" table (4088 tbl 05) and applies to both commercial and industrial versions of the 7035X20 series. The 7035S20PF part number explicitly denotes the industrial-grade variant with 20 ns access time.

Does the 7035S20PF support battery backup data retention?

No, the 7035S20PF does not support battery backup data retention. That feature is exclusive to the "L" suffix variants (e.g., 7035L20PF), which specify 2 V data retention capability and lower standby current (ISB3 = 0.2 mA). The "S" in 7035S20PF indicates standard power consumption (ISB1 = 20 mA), and no data retention waveform or V_DR parameter is specified for this variant.

How does the M/S pin affect BUSY pin behavior on the 7035S20PF?

When M/S = VIH, BUSYL and BUSYR operate as push-pull outputs asserting active-low BUSY during address collisions. When M/S = VIL, both BUSY pins become inputs used to inhibit writes - allowing cascaded slave devices to respond to a master's BUSY signal. This behavior is documented in Notes 1 and 2 of the Functional Block Diagram and Pin Configurations section.

Can the 7035S20PF perform simultaneous reads from both ports to the same memory location?

Yes, the 7035S20PF supports true simultaneous reads from both ports to the same memory address without conflict or performance penalty. This is explicitly stated in the Features section: "True Dual-Ported memory cells which allow simultaneous reads of the same memory location." No BUSY assertion or arbitration delay occurs during such operations.

What are the valid interrupt mailbox addresses for the 7035S20PF?

The 7035S20PF uses fixed hexadecimal addresses 1FFE_H (for INTL assertion/clear) and 1FFF_H (for INTR assertion/clear) as interrupt mailboxes. Writing to 1FFE_H with the right port sets INTL; reading that address with the left port clears it. Identical logic applies to 1FFF_H and INTR. This is defined in the Functional Description and Truth Table III.

7035S20PF Specifications

Product attributes: Attribute value

Manufacturer:: Renesas

Series:: -

Package/Case:: 100-LQFP

Packaging:: Tray

Product Status:: Obsolete

Programmable:: Not Verified

Memory Type:: Volatile

Memory Format:: SRAM

Technology:: SRAM - Dual Port, Asynchronous

Memory Size:: 144Kbit

Memory Organization:: 8K x 18

Memory Interface:: Parallel

Clock Frequency:: -

Write Cycle Time - Word, Page:: 20ns

Access Time:: 20 ns

Voltage - Supply:: 4.5V ~ 5.5V

Operating Temperature:: 0°C ~ 70°C (TA)

Grade:: -

Qualification:: -

Mounting Type:: Surface Mount

Supplier Device Package:: 100-TQFP (14x14)

7035S20PF FAQ

1.How can I place an order for 7035S20PF through Aetrix?

Please submit a Request for Quotation (RFQ) for 7035S20PF 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 7035S20PF reliable?

The price and inventory of 7035S20PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 7035S20PF is usually 5 days.

3.What payment methods are accepted for 7035S20PF?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 7035S20PF transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for 7035S20PF?

7035S20PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your 7035S20PF 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 7035S20PF?

For technical support, including 7035S20PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 7035S20PF requirements.

6.How does Aetrix verify that 7035S20PF is sourced from the original manufacturer or authorized distributors?

All 7035S20PF 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 7035S20PF meets industry standards.

7.What is the process for return or replacement of 7035S20PF?

All 7035S20PF units undergo pre-shipment inspection (PSI). If there is an issue with 7035S20PF, 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 7035S20PF part is unused and in its original packaging.

Return procedure for 7035S20PF:

1.Submit a request within 90 days.

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

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