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Renesas 70V24L55PF
- Part No.:
- 70V24L55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V24L55PF.pdf
- Description:
- IC SRAM 64KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,849
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Product details
Overview
70V24L55PF from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right ports, 55 ns read cycle time, 3.3 V single-supply operation, and integrated semaphore arbitration logic. It enables simultaneous asynchronous access to the same memory location in telecom switching fabric buffers and real-time DSP co-processor interconnects.
For engineers reviewing the 70V24L55PF datasheet, 70V24L55PF pinout, 70V24L55PF application, or 70V24L55PF equivalent, key selection criteria include industrial temperature support (–40°C to +85°C), 84-pin PLCC package compatibility, low standby current (660 µA typ.), and full hardware semaphore signaling for multi-processor resource locking.
Technical Context
This device implements fully asynchronous dual-port architecture with separate address, control, and I/O buses per port-enabling concurrent read/write operations without external arbitration logic. Its on-chip port arbitration resolves contention via BUSY flag assertion and supports MASTER/SLAVE cascading for wider data bus expansion (e.g., 32-bit systems).
The 70V24L55PF integrates dedicated semaphore registers (8 flags, addressed by A0–A2) with atomic read-modify-write capability, enabling deterministic mutual exclusion between processors. All I/Os are LVTTL-compatible, and power management includes CE-controlled automatic entry into ultra-low-power standby mode (660 µA typical).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K × 16-bit (64 Kbit total); supports independent 16-bit data transfers on each port |
| Read Cycle Time (tRC) | 55 ns max - defines minimum clock period for sustained random-access reads |
| Supply Voltage | 3.3 V ± 0.3 V - compatible with modern 3.3 V logic families; no level-shifting required |
| Standby Current (ISB3) | 660 µA typical - enables low-power hold mode during processor idle cycles |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded systems and base station equipment |
| Package | 84-pin PLCC (PLG84) - through-hole mountable; 1.15″ × 1.15″ footprint with standard socket compatibility |
| Input/Output Interface | LVTTL-compatible - ensures direct interfacing with FPGA I/O banks and microcontroller GPIOs |
Pinout & Package
70V24L55PF is housed in an 84-pin Plastic Leaded Chip Carrier (PLCC, package code PLG84), measuring approximately 1.15 in × 1.15 in × 0.17 in. Pin 1 is marked by a corner notch; all VDD pins require decoupling to local 3.3 V supply, and all VSS pins must be connected to system ground.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; controls power-down of respective port's internal circuitry |
| R/WL / R/WR | Read/Write Control (Left / Right) | Active-low signal determining direction of data transfer on each port |
| OEL / OER | Output Enable (Left / Right) | Active-low tri-state control for I/O drivers; allows shared bus operation |
| UBL / UBR | Upper Byte Select (Left / Right) | Selects I/O8–I/O15 for 16-bit access; enables byte-level granularity |
| LBL / LBR | Lower Byte Select (Left / Right) | Selects I/O0–I/O7 for 16-bit access; supports multiplexed bus compatibility |
| SEML / SEMR | Semaphore Enable (Left / Right) | Activates semaphore register access mode (A0–A2 address semaphore flags) |
| BUSYL / BUSYR | Busy Flag (Left / Right) | Open-drain push-pull output indicating port contention; used for hardware arbitration |
| INTL / INTR | Interrupt Flag (Left / Right) | Asynchronous interrupt output triggered by semaphore state change or write completion |
| A0L–A11L / A0R–A11R | Address Inputs (Left / Right) | 12-bit address bus per port; supports full 4K address space (A12 is NC) |
| I/O0L–I/O15L / I/O0R–I/O15R | Data I/O (Left / Right) | 16-bit bidirectional data path per port; supports simultaneous read/write to same location |
| M/S | Master/Slave Select | VIL configures port as Slave (BUSY input); VIH configures as Master (BUSY output) |
| VDD / VSS | Power / Ground | Multiple distributed VDD/VSS pins ensure stable core voltage and low-noise grounding |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous independent read/write access to identical memory locations without collision or wait states |
| Hardware Semaphore Logic | Eight dedicated flags with atomic read-modify-write; eliminates software overhead for multi-processor resource locking |
| MASTER/SLAVE Cascading | Supports 32-bit+ data bus expansion using BUSY handshake; no external glue logic required |
| Ultra-Low Standby Power | 660 µA typical ISB3 current enables energy-efficient operation in always-on industrial controllers |
| Industrial Temperature Range | –40°C to +85°C operation validated across full voltage range (3.0–3.6 V), suitable for harsh environments |
Applications
| Telecom Switching Fabric Buffer | DSP Co-Processor Interconnect |
|---|---|
Use Scenario: High-throughput packet buffering in TDM-based voice gateways where two ASICs concurrently access shared memory for header parsing and payload forwarding. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-wait-state shared buffer with deterministic arbitration via BUSY and semaphore flags. Use Value: Eliminates FIFO synchronization overhead and guarantees sub-55 ns latency for real-time packet reassembly. | Use Scenario: Real-time audio processing pipeline where a DSP core writes filtered samples while a host ARM processor reads results for UI display and network streaming. IC Role / Device Role / Timing Role: Memory bridge enabling lock-free data exchange between heterogeneous processors using hardware semaphores. Use Value: Sustains 192 kHz stereo sample rate with <1 µs inter-processor handoff delay and no CPU polling. |
| Industrial PLC I/O Mapping Table | Avionics Sensor Fusion Hub |
Use Scenario: Deterministic I/O image storage in safety-critical programmable logic controllers where scan cycle timing must remain invariant under varying load conditions. IC Role / Device Role / Timing Role: Non-volatile shadow RAM replacement providing guaranteed 55 ns access for cyclic I/O update routines. Use Value: Ensures hard real-time response (<100 µs jitter) for emergency stop monitoring and motion control loops. | Use Scenario: Multi-sensor data aggregation in flight control computers, where inertial, pressure, and GPS data streams are time-aligned and fused before Kalman filtering. IC Role / Device Role / Timing Role: Time-stamped buffer with atomic semaphore access ensuring consistent sensor timestamp ordering across redundant processing channels. Use Value: Prevents race-condition-induced attitude estimation drift; meets DO-254 Level A determinism requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C024AV-55AXC | 55 ns access, 4K × 16, 3.3 V, 100-pin TQFP; higher active current (180 mA vs. 155 mA typ.) | Requires PCB redesign due to TQFP vs. PLCC; better thermal dissipation but no through-hole option | Select when board space permits surface-mount and higher thermal budget is acceptable |
| IDT70V24L35PF | 35 ns access, same 4K × 16 organization, 84-pin PLCC, identical pinout and voltage specs | Higher performance at cost of increased dynamic power (180 mA vs. 155 mA typ.) and reduced noise margin | Select when system timing margin requires faster access and industrial temp rating is retained |
Compared with CY7C024AV-55AXC and IDT70V24L35PF, the 70V24L55PF offers optimal balance of industrial temperature support, through-hole PLCC packaging, and ultra-low standby power-making it preferred for legacy-replacement and ruggedized embedded designs where layout stability and power efficiency are prioritized over peak speed.
Availability
70V24L55PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial PLCs, and avionics subsystems requiring stable component supply, long-term lifecycle assurance, and RoHS-compliant green packaging.
Supply support for 70V24L55PF 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 and computing markets.
The IDT70V24 family delivers high-speed dual-port SRAMs optimized for real-time inter-processor communication, telecom switching, and industrial control-emphasizing deterministic arbitration, low-power standby, and industrial-grade reliability.
FAQ
What is the maximum operating temperature range for the 70V24L55PF?
The 70V24L55PF is rated for industrial temperature operation from –40°C to +85°C, verified across its full 3.0 V to 3.6 V supply range. This specification is confirmed in the Absolute Maximum Ratings and DC Electrical Characteristics tables of the official IDT datasheet DSC-5624/10, making it suitable for deployment in base stations, factory automation controllers, and aerospace environmental enclosures.
Does the 70V24L55PF support true simultaneous read/write to the same memory address?
Yes, the 70V24L55PF implements true dual-port SRAM cells that allow concurrent read and write operations to the exact same memory location without corruption or arbitration delay. This behavior is explicitly stated in the Features section of the datasheet and enabled by physically independent read/write paths per port-critical for real-time inter-processor data exchange in the 70V24L55PF application space.
How does the semaphore functionality work in the 70V24L55PF?
The 70V24L55PF includes eight hardware semaphore flags accessed via A0–A2 address lines when SEM is asserted low. Each flag supports atomic read-modify-write: writing to I/O0 sets the flag, reading returns its state across all I/O pins. This eliminates software race conditions in multi-processor systems and is fully documented in Truth Table II and the Semaphore Read/Write Control section of the 70V24L55PF datasheet.
What is the standby current consumption of the 70V24L55PF in full CMOS standby mode?
In full standby mode (ISB3), where both ports' chip enables are held high and all inputs are at valid CMOS levels, the 70V24L55PF draws only 660 µA typical current. This value is specified in Table 09b of the datasheet under "Full Standby Current (Both Ports – CMOS Level Inputs)" and reflects the ultra-low-power design essential for battery-backed or energy-constrained 70V24L55PF deployments.
Is the 70V24L55PF pin-compatible with other members of the IDT70V24 family?
Yes, the 70V24L55PF shares identical pinout and package (84-pin PLCC) with all IDT70V24 variants including IDT70V24L15PF and IDT70V24L35PF. A12 is designated No Connect (NC) across the family, and all control, address, and I/O signals map identically-enabling drop-in replacement for speed bin upgrades or qualification changes without PCB modification.
70V24L55PF 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:
- 64Kbit
- Memory Organization:
- 4K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 55ns
- Access Time:
- 55 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)
70V24L55PF FAQ
1.How can I place an order for 70V24L55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V24L55PF 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 70V24L55PF reliable?
The price and inventory of 70V24L55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V24L55PF is usually 5 days.
3.What payment methods are accepted for 70V24L55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V24L55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V24L55PF?
70V24L55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V24L55PF 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 70V24L55PF?
For technical support, including 70V24L55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V24L55PF requirements.
6.How does Aetrix verify that 70V24L55PF is sourced from the original manufacturer or authorized distributors?
All 70V24L55PF 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 70V24L55PF meets industry standards.
7.What is the process for return or replacement of 70V24L55PF?
All 70V24L55PF units undergo pre-shipment inspection (PSI). If there is an issue with 70V24L55PF, 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 70V24L55PF part is unused and in its original packaging.
Return procedure for 70V24L55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V24L55PF Tags
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M24C02-WMN6TP
STMicroelectronics
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AT24C02C-XHM-T
Microchip Technology
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AT21CS01-STUM10-T
Microchip Technology
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AT24C02C-SSHM-T
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24LC01BT-I/OT
Microchip Technology
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M24C02-FMC6TG
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AT24CS02-SSHM-T
Microchip Technology
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93LC46BT-I/OT
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AT24C04C-SSHM-T
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24LC01BT-I/SN
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24AA02UIDT-I/OT
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AT24C08C-STUM-T
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