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Renesas 70V28VL20PF8
- Part No.:
- 70V28VL20PF8
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V28VL20PF8.pdf
- Description:
- IC SRAM 1MBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:2,908
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Product details
Overview
70V28VL20PF8 from Integrated Device Technology is a high-speed 3.3V 64K × 16 true dual-ported static RAM with independent left/right ports, 20 ns max access time (industrial grade), LVTTL-compatible I/O, and on-chip semaphore/arbiration logic for multiprocessor synchronization. It enables simultaneous read/write to the same memory location in systems requiring deterministic inter-processor communication.
For engineers reviewing the 70V28VL20PF8 datasheet, 70V28VL20PF8 pinout, 70V28VL20PF8 application, or 70V28VL20PF8 equivalent, key selection criteria include BUSY-flag arbitration timing (tBAA ≤ 20 ns), dual chip-enable depth expansion capability, M/S-configurable master/slave operation, and 100-pin TQFP packaging for industrial temperature (–40°C to +85°C) embedded control.
Technical Context
The 70V28VL20PF8 implements fully asynchronous dual-port architecture with separate address, data, and control buses per port - enabling concurrent access without internal clocking. Its hardware arbitration uses push-pull BUSY outputs (not open-drain) and supports both address-match and CE-controlled BUSY assertion modes with tAPS = 5 ns priority setup.
It integrates eight dedicated semaphore latches (addressed via A0–A2) accessible only when SEM = VIL and CE = VIH, providing token-passing synchronization independent of the main 64K×16 memory array. Interrupt flags (INTL/INTR) are triggered by writes to fixed addresses FFFEH (left port sets right flag) and FFFFH (right port sets left flag).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 64K × 16-bit (1,048,576 bits), true dual-ported SRAM cells |
| Access Time (max) | 20 ns - guarantees worst-case read latency under industrial conditions (–40°C to +85°C, VCC = 3.3V ±0.3V) |
| Supply Voltage | 3.0–3.6 V - single LVTTL-compatible rail; all VCC pins must be connected |
| Power Consumption | Active: 135 mA typ. (205 mA max); Full standby: 0.2 mA typ. (3.0 mA max) - enables low-power multiprocessor sleep coordination |
| Arbitration Logic | BUSY output (push-pull) with tBDD ≤ 17 ns - blocks conflicting writes and enables stall-based synchronization without software polling |
| Semaphore Support | 8 independent binary flags - accessed via dedicated SEM pin and A0–A2; protected against simultaneous write contention |
| Operating Temperature | –40°C to +85°C - qualified for industrial-grade embedded control and communications infrastructure |
Pinout & Package
70V28VL20PF8 is housed in a 100-pin Thin Quad Flatpack (TQFP) with 0.5 mm pitch, body size 14 mm × 14 mm × 1.4 mm. All VCC and GND pins require connection per datasheet Note 1–2.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CE0L / CE1L CE0R / CE1R | Chip Enable (Left/Right) | Dual enables per port allow independent power-down and depth expansion without external logic |
| R/WL / R/WR | Read/Write Control | Active-low signal determines direction per port; used with CE to initiate memory cycle |
| OEL / OER | Output Enable | Controls tri-state of I/O drivers; required for bus sharing in multiplexed systems |
| UBL / UBR LBL / LBR | Upper/Lower Byte Select | Enables byte-level writes (I/O0–7 or I/O8–15) for 8-bit bus compatibility and partial-word updates |
| SEML / SEMR | Semaphore Enable | When low, enables access to 8 semaphore latches (A0–A2); isolates semaphore logic from main memory |
| BUSYL / BUSYR | Busy Flag | Push-pull output (master) or input (slave); asserts when both ports access same address - prevents data corruption |
| INTL / INTR | Interrupt Flag | Open-collector compatible (per truth table), set/cleared by writes to FFFEH/FFFFH - enables mailbox-style IPC |
| M/S | Master/Slave Select | VIL configures BUSY as input (slave mode); VIH configures BUSY as output (master mode) - defines arbitration role |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Independent left/right address/data/control paths enable zero-wait-state concurrent access - no performance penalty from cross-port activity |
| Hardware Semaphore Logic | Eight dedicated latches with atomic read/write via SEM pin - eliminates need for software mutexes in real-time OS environments |
| Configurable Arbitration Mode | M/S pin selects master (BUSY output) or slave (BUSY input) behavior - supports cascaded arrays and hierarchical resource locking |
| Byte-Level Write Control | Separate UBL/LBL and UBR/LBR signals permit 8-bit updates on 16-bit bus - reduces bus traffic and avoids read-modify-write cycles |
| Low-Power Standby | ISB3 = 0.2 mA typ. with CMOS-level inputs - enables energy-efficient idle states in battery-backed or fanless industrial controllers |
Applications
| Industrial PLC Communication Module | Avionics Data Concentrator |
|---|---|
Use Scenario: Two ARM Cortex-M7 cores exchange sensor fusion results and actuator commands via shared memory in a safety-critical motion controller. IC Role / Device Role / Timing Role: 70V28VL20PF8 serves as deterministic inter-core buffer with hardware semaphore coordination - eliminating race conditions during concurrent register updates. Use Value: 20 ns access + tBDD ≤ 17 ns ensures sub-40 ns worst-case arbitration response, meeting SIL-3 timing constraints for closed-loop servo control. |
Use Scenario: ARINC 664 (AFDX) end system aggregates health monitoring data from multiple LRUs using time-triggered scheduling. IC Role / Device Role / Timing Role: 70V28VL20PF8 acts as dual-port mailbox between flight management computer (FMC) and integrated modular avionics (IMA) partition - synchronized via INTL/INTR flags. Use Value: FFFEH/FFFFH interrupt addressing enables zero-latency notification of critical fault events without CPU polling overhead. |
| Medical Imaging Subsystem | 5G Baseband Signal Processor |
Use Scenario: FPGA-accelerated image reconstruction engine shares raw DICOM frames with ARM-based UI processor in MRI scanner front-end. IC Role / Device Role / Timing Role: 70V28VL20PF8 provides non-blocking frame buffer with UBL/LBL byte masking - allowing partial display updates while reconstruction continues. Use Value: 16-bit data width + 20 ns access sustains >480 MB/s sustained bandwidth for real-time 4K video overlay rendering. |
Use Scenario: Dual-DSP cluster in massive MIMO radio unit exchanges channel estimation coefficients and precoding matrices in LTE/NR physical layer processing. IC Role / Device Role / Timing Role: 70V28VL20PF8 functions as low-latency coefficient exchange buffer with semaphore-controlled access - preventing FFT pipeline stalls during beamforming updates. Use Value: Hardware semaphore flags reduce inter-DSP synchronization latency to <5 ns, enabling sub-microsecond coherence in real-time RF calibration loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-200BZI | 200 MHz QDR interface, 3.3V core but 1.8V I/O; no built-in semaphore logic; 165-pin FBGA | Requires external arbitration logic and level-shifting; suited for high-throughput streaming, not deterministic IPC | Choose for bandwidth >1.6 GB/s; avoid if semaphore/BUSY hardware is required for safety-critical locking |
| IDT70V36S20PF8 | Same 100-pin TQFP package and 20 ns speed, but 128K × 18 organization; includes JTAG boundary scan | Higher density and wider data path; identical arbitration/semaphore implementation - drop-in replacement for memory upgrade | Choose when 128K×18 capacity or IEEE 1149.1 testability is needed; otherwise 70V28VL20PF8 remains optimal for 64K×16 footprint |
Compared with CY7C1362BV33-200BZI and IDT70V36S20PF8, the 70V28VL20PF8 uniquely balances industrial temperature support, integrated semaphore/BUSY logic, and 100-pin TQFP compactness - making it the only option that delivers deterministic inter-processor coordination without external components or layout changes.
Availability
70V28VL20PF8 is available at Aetrix Electronics and suitable for industrial PLC communication modules, avionics data concentrators, and medical imaging subsystems requiring stable component supply across extended product lifecycles.
Supply support for 70V28VL20PF8 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, designs high-performance timing, memory, and interface solutions for communications, computing, and industrial markets.
The 70V28VL20PF8 belongs to IDT's legacy high-speed dual-port SRAM family, engineered specifically for deterministic multiprocessor synchronization in real-time embedded systems where hardware-enforced resource locking is mandatory.
FAQ
What is the maximum operating temperature range supported by the 70V28VL20PF8?
The 70V28VL20PF8 is rated for industrial temperature operation from –40°C to +85°C. This specification is validated per datasheet Section 3 (Absolute Maximum Ratings) and confirmed in DC/AC Electrical Characteristics tables for the "Ind" grade. The 20 ns access time guarantee applies across this full range at VCC = 3.3V ±0.3V.
How does the BUSY arbitration logic function in master versus slave configuration on the 70V28VL20PF8?
When M/S = VIH, the 70V28VL20PF8 operates as master: BUSYL and BUSYR are push-pull outputs asserting low during address contention to stall the delayed port. When M/S = VIL, it operates as slave: BUSYL and BUSYR become inputs that must be driven externally to inhibit writes - enabling hierarchical arbitration in multi-device arrays.
Can the 70V28VL20PF8 be used for byte-wide (8-bit) data transfers, and how is this controlled?
Yes - the 70V28VL20PF8 supports byte-selective writes via dedicated UBL/LBL (left port) and UBR/LBR (right port) signals. Asserting only UBL (or UBR) enables writing to I/O0–I/O7; asserting only LBL (or LBR) enables I/O8–I/O15; asserting both performs full 16-bit writes. This is defined in Truth Table II and verified in AC timing parameter tABE.
What addresses trigger the interrupt flags INTL and INTR on the 70V28VL20PF8?
INTL is asserted when the right port writes to address FFFEH (with CER = R/WR = VIL); INTR is asserted when the left port writes to FFFFH. Both flags are cleared by reading the respective address (e.g., reading FFFEH clears INTL). This behavior is documented in Truth Table IV and Functional Description section.
Is external pull-up resistance required for the BUSY or INT pins of the 70V28VL20PF8?
No - BUSYL and BUSYR are push-pull outputs (not open-drain) in master mode and require no external pull-ups. INTL and INTR are specified as "non-tri-state totem-pole outputs" per datasheet Feature list Note 2, confirming active-drive capability. Pull-ups are unnecessary unless interfacing with legacy open-collector systems.
70V28VL20PF8 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:
- 1Mbit
- Memory Organization:
- 64K x 16
- Memory Interface:
- Parallel
- Clock Frequency:
- -
- Write Cycle Time - Word, Page:
- 20ns
- Access Time:
- 20 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)
70V28VL20PF8 FAQ
1.How can I place an order for 70V28VL20PF8 through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V28VL20PF8 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 70V28VL20PF8 reliable?
The price and inventory of 70V28VL20PF8 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V28VL20PF8 is usually 5 days.
3.What payment methods are accepted for 70V28VL20PF8?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V28VL20PF8 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V28VL20PF8?
70V28VL20PF8 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V28VL20PF8 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 70V28VL20PF8?
For technical support, including 70V28VL20PF8 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V28VL20PF8 requirements.
6.How does Aetrix verify that 70V28VL20PF8 is sourced from the original manufacturer or authorized distributors?
All 70V28VL20PF8 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 70V28VL20PF8 meets industry standards.
7.What is the process for return or replacement of 70V28VL20PF8?
All 70V28VL20PF8 units undergo pre-shipment inspection (PSI). If there is an issue with 70V28VL20PF8, 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 70V28VL20PF8 part is unused and in its original packaging.
Return procedure for 70V28VL20PF8:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V28VL20PF8 Tags
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M24C02-WMN6TP
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AT24C02C-XHM-T
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AT21CS01-STUM10-T
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M24C02-FMC6TG
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AT24CS02-SSHM-T
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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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