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Renesas 70V24S35PF8
- Part No.:
- 70V24S35PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V24S35PF8.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,826
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Product details
Overview
70V24S35PF8 from Integrated Device Technology (IDT) is a high-speed 3.3V 4K x 16 true dual-port static RAM with independent left/right ports, 35 ns max read cycle time, 35 ns max write cycle time, and industrial temperature support (–40°C to +85°C). It enables simultaneous asynchronous access to shared memory in real-time inter-processor communication systems.
For engineers reviewing the 70V24S35PF8 datasheet, 70V24S35PF8 pinout, 70V24S35PF8 application, or 70V24S35PF8 equivalent, key selection criteria include dual-port arbitration logic, on-chip semaphore support, BUSY/INT flag signaling, and compatibility with 3.3V LVTTL interfaces in master/slave cascaded memory configurations.
Technical Context
The 70V24S35PF8 implements fully asynchronous dual-port operation with separate address, control, and I/O buses per port. Its on-chip arbitration logic resolves contention via hardware BUSY flag generation and supports semaphore signaling across ports using dedicated SEM pins and A0–A2 address lines.
It features independent chip enable (CEL/CER), read/write (R/WL/R/WR), output enable (OEL/OER), upper/lower byte select (UBL/UBR, LBL/LBR), and interrupt/BUSY signaling - all compatible with 3.3V ±0.3V supply and LVTTL logic levels. The device operates in commercial and industrial grades with full CMOS-level standby modes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K x 16-bit (64 Kbit), true dual-port SRAM with independent left/right access paths |
| Access Time (tAA) | 35 ns max - defines minimum address-to-data valid delay for timing-critical real-time systems |
| Read Cycle Time (tRC) | 35 ns max - sets maximum sustained read throughput of ~28.6 MHz per port |
| Write Cycle Time (tWC) | 35 ns max - ensures deterministic write latency for synchronized inter-processor data exchange |
| Supply Voltage | 3.3 V ± 0.3 V - compatible with standard LVTTL I/O domains without level translation |
| Operating Temperature | –40°C to +85°C - qualified for industrial embedded control and communications equipment |
| Standby Current (ISB1) | 13 mA max (TTL inputs) - enables low-power idle states during inter-port handshaking |
Pinout & Package
70V24S35PF8 is housed in an 84-pin PLCC (PLG84) package measuring approximately 1.15 in × 1.15 in × 0.17 in, with 4 ground (VSS) and 4 power (VDD) pins distributed for noise reduction and thermal stability.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enables memory access on respective port; controls power-down entry when deasserted |
| R/WL / R/WR | Read/Write Control (Left / Right) | Determines direction of data transfer per port; required LOW for writes, HIGH for reads |
| OEL / OER | Output Enable (Left / Right) | Tri-states I/O drivers independently; allows shared bus usage without external buffers |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enables 8-bit granularity access to 16-bit data bus - critical for mixed-width peripheral interfacing |
| SEML / SEMR | Semaphore Enable | Activates on-chip semaphore register access (A0–A2) for inter-port synchronization without software overhead |
| BUSYL / BUSYR | Busy Flag (Input/Output) | Configurable as input (Slave) or output (Master) to signal port contention during simultaneous same-address access |
| INTL / INTR | Interrupt Flag | Open-drain push-pull output signals completion of semaphore operations or user-defined events |
| A0L–A11L, A0R–A11R | Address Inputs | 12-bit addressing supports 4K depth per port; A12 is no-connect per datasheet note |
| I/O0L–I/O7L, I/O0R–I/O7R | Data I/O (Lower Byte) | 8-bit bidirectional data path for lower byte; used with LBL/LBR for byte-select writes/reads |
| I/O8L–I/O15L, I/O8R–I/O15R | Data I/O (Upper Byte) | 8-bit bidirectional data path for upper byte; used with UBL/UBR for byte-select operations |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables concurrent read/write from both ports to same or different addresses without arbitration delay |
| Hardware Semaphore Logic | Eight dedicated flags accessible via A0–A2 and SEM pin - eliminates need for external locking logic or polling |
| Master/Slave Cascading Support | M/S pin configures BUSY as input (Slave) or output (Master), enabling error-free 32-bit+ memory expansion |
| Asynchronous Port Operation | No clock required - simplifies timing closure in heterogeneous system-on-module designs with mixed clock domains |
| Low-Power Standby Modes | Full standby current as low as 0.2 mA (ISB3) - extends uptime in battery-backed or energy-constrained systems |
Applications
| Industrial PLC Memory Buffer | Real-Time DSP Co-Processor Interface |
|---|---|
Use Scenario: Shared memory between main CPU and motion-control FPGA in programmable logic controllers. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency data exchange buffer with hardware semaphore coordination. Use Value: Eliminates software mutex overhead and guarantees deterministic response under worst-case scan-cycle jitter. | Use Scenario: Inter-processor communication between ARM host and TI C6000 DSP in radar signal processing units. IC Role / Device Role / Timing Role: Provides synchronous, non-blocking access to FFT coefficient tables and result buffers. Use Value: Enables pipelined execution where DSP writes results while host reads prior frame data - no wait states. |
| Telecom Line Card Packet Buffer | Avionics Data Concentrator |
Use Scenario: Temporary storage for packet headers and payload fragments in multi-protocol line cards. IC Role / Device Role / Timing Role: Left port handles ingress packet assembly; right port services egress scheduling engine. Use Value: 35 ns access time meets sub-microsecond latency requirements for 10G Ethernet traffic shaping. | Use Scenario: Centralized sensor fusion hub aggregating ARINC-429, MIL-STD-1553, and discrete I/O in flight control computers. IC Role / Device Role / Timing Role: Serves as time-deterministic shared memory between safety-critical and non-critical partitions. Use Value: Hardware BUSY flag prevents race conditions during cross-partition health status updates. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-133AXC | 4K x 16, 133 MHz (7.5 ns), 3.3V, 100-pin TQFP - faster but larger footprint and higher power | Targets high-throughput networking ASIC interfaces requiring sub-10 ns latency | Select when system timing budget demands <10 ns access and PCB area permits TQFP |
| AS7C34098B-15JCN | 4K x 16, 15 ns, 3.3V, 84-pin PLCC - identical package but commercial temp only (0°C to +70°C) | Suitable for cost-sensitive consumer or lab equipment without extended temperature needs | Choose for commercial-grade applications where industrial qualification is unnecessary |
Compared with CY7C1362BV33-133AXC and AS7C34098B-15JCN, the 70V24S35PF8 delivers optimal balance of industrial temperature support, PLCC package compatibility, and 35 ns performance - making it ideal for legacy-replacement and ruggedized embedded designs where layout reuse and reliability outweigh raw speed.
Availability
70V24S35PF8 is available at Aetrix Electronics and suitable for industrial PLCs, avionics data concentrators, and telecom line card designs requiring stable component supply, long-term lifecycle assurance, and traceable sourcing.
Supply support for 70V24S35PF8 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), now part of Renesas Electronics, is a fabless semiconductor company specializing in timing, memory interface, RF, and power management ICs for communications, computing, and industrial markets.
The IDT70V24 family was designed specifically for deterministic inter-processor communication in real-time embedded systems - emphasizing hardware arbitration, semaphore support, and industrial-grade reliability over raw bandwidth.
FAQ
What is the maximum operating frequency supported by the 70V24S35PF8?
The 70V24S35PF8 does not operate from a clock signal - it is an asynchronous dual-port SRAM. Its maximum effective throughput is determined by its 35 ns read cycle time (tRC), supporting up to ~28.6 million read operations per second per port under ideal conditions. Timing margins must account for board trace delays, loading, and setup/hold requirements per AC specifications.
Does the 70V24S35PF8 support true simultaneous read/write operations on both ports?
Yes, the 70V24S35PF8 supports true simultaneous access: both ports can perform independent read or write operations at any time. When both attempt to access the same memory location concurrently, on-chip arbitration asserts the BUSY flag to prevent data corruption - ensuring deterministic behavior without external logic.
How is semaphore functionality implemented in the 70V24S35PF8?
The 70V24S35PF8 implements eight hardware semaphore flags accessed via I/O0 and address lines A0–A2. When SEM is asserted (LOW), writes to I/O0 update the selected flag; reads return the flag state across all I/O pins. This provides atomic test-and-set capability without CPU intervention - critical for lock-free inter-processor synchronization in the 70V24S35PF8.
What is the function of the M/S pin on the 70V24S35PF8?
The M/S (Master/Slave) pin configures BUSY pin behavior: when pulled HIGH, BUSY functions as an output indicating local port contention (Master mode); when pulled LOW, BUSY becomes an input accepting BUSY signals from a cascaded Master device (Slave mode). This enables seamless 32-bit+ memory expansion using multiple 70V24S35PF8 devices without external glue logic.
Can the 70V24S35PF8 be operated with a 2.5V supply?
No - the 70V24S35PF8 is specified exclusively for 3.3V ±0.3V operation (3.0V to 3.6V). Supplying 2.5V violates the Absolute Maximum Ratings and will result in undefined behavior, including failure to meet timing specs, increased leakage, or inability to drive LVTTL-compatible outputs. Always use a regulated 3.3V source compliant with datasheet DC operating conditions.
70V24S35PF8 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Series:
- -
- Package/Case:
- 100-LQFP
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Programmable:
- Not Verified
- Memory Type:
- Volatile
- Memory Format:
- SRAM
- Technology:
- SRAM - Dual Port, Asynchronous
- Memory Size:
- 64Kbit
- Memory Organization:
- 4K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 35ns
- Access Time:
- 35 ns
- Voltage - Supply:
- 3V ~ 3.6V
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 100-TQFP (14x14)
70V24S35PF8 FAQ
1.How can I place an order for 70V24S35PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V24S35PF8 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 70V24S35PF8 reliable?
The price and inventory of 70V24S35PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V24S35PF8 is usually 5 days.
3.What payment methods are accepted for 70V24S35PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V24S35PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V24S35PF8?
70V24S35PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V24S35PF8 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 70V24S35PF8?
For technical support, including 70V24S35PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V24S35PF8 requirements.
6.How does Aetrix verify that 70V24S35PF8 is sourced from the original manufacturer or authorized distributors?
All 70V24S35PF8 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 70V24S35PF8 meets industry standards.
7.What is the process for return or replacement of 70V24S35PF8?
All 70V24S35PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V24S35PF8, 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 70V24S35PF8 part is unused and in its original packaging.
Return procedure for 70V24S35PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V24S35PF8 Tags
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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AT24CS02-SSHM-T
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24LC01BT-I/SN
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AT24C08C-STUM-T
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