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Renesas 70V25S55PF
- Part No.:
- 70V25S55PF
- Manufacturer:
- Renesas
- Category:
- Memory
- Package:
- 100-LQFP
- Datasheet:
-
70V25S55PF.pdf
- Description:
- IC SRAM 128KBIT PARALLEL 100TQFP
- Quantity:
- Payment:
- Shipping:
Inventory:1,662
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Product details
Overview
70V25S55PF from Integrated Device Technology (IDT) is a high-speed 4K x 16 true dual-port static RAM with independent left/right asynchronous ports, 55 ns read/write cycle time, 3.3 V single-supply operation, and integrated semaphore arbitration logic - used in real-time inter-processor communication systems requiring concurrent memory access without external logic.
For engineers reviewing the 70V25S55PF datasheet, 70V25S55PF pinout, 70V25S55PF application, or 70V25S55PF equivalent, this page delivers verified timing specs (tRC = 55 ns), power metrics (active 120 mA typ., standby 13 mA typ.), dual-port arbitration behavior, TQFP-100 package mapping, and validated alternatives for industrial embedded control, telecom line cards, and FPGA co-processor memory buffers.
Technical Context
The 70V25S55PF implements fully asynchronous dual-port architecture with separate address, data, and control buses per port, enabling simultaneous read/write to the same location via true dual-ported SRAM cells. It supports master/slave cascading for 32-bit+ bus expansion using M/S pin-driven BUSY flag handshaking.
On-chip hardware includes full semaphore signaling (8 flags, A0–A2 addressed), port arbitration logic, and independent upper/lower byte enables (UBL/LBL, UBR/LBR) for multiplexed bus compatibility. All I/Os are LVTTL-compatible with 3.3 V ±0.3 V supply and operate across commercial temperature range (0°C to +70°C).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Memory Organization | 4K x 16 (64 Kbit), true dual-port SRAM with independent left/right access paths |
| Access Time (tAA) | 55 ns max - defines minimum address hold before valid data appears on I/Os |
| Read Cycle Time (tRC) | 55 ns max - determines maximum sustained read throughput (18.2 MHz) |
| Supply Voltage | 3.3 V ±0.3 V - single LVTTL-compatible rail; no 5 V or mixed-voltage support |
| Active Current (IDD) | 120 mA typical - corresponds to ~400 mW power draw during dual-port activity |
| Standby Current (ISB1) | 13 mA typical - TTL-level input standby mode with both CE pins high |
| Operating Temperature | 0°C to +70°C - commercial grade; not rated for industrial (-40°C to +85°C) |
| Package | 100-pin TQFP (PNG100), 14 mm × 14 mm × 1.4 mm body - RoHS-compliant, green variant |
Pinout & Package
70V25S55PF is housed in a 100-pin Thin Quad Flatpack (TQFP, package code PNG100) with exposed thermal pad (not electrically connected). Pin assignments follow standard IDT dual-port layout: left port (L) and right port (R) each have dedicated address (A0L–A11L / A0R–A11R), data (I/O0L–I/O15L / I/O0R–I/O15R), and control (CEL/CER, OEL/OER, R/WL/R/WR, UBL/UBR, LBL/LBR, INTL/INTR, BUSYL/BUSYR, SEML/SEMR, M/S) signals. A12 is No Connect.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CEL / CER | Chip Enable (Left / Right) | Active-low enable per port; disables internal circuitry and forces I/Os to high-Z when deasserted |
| R/WL / R/WR | Read/Write Control (Left / Right) | Low = write, high = read; controls direction of data flow on respective port's I/O bus |
| OEL / OER | Output Enable (Left / Right) | Active-low; gates output drivers independently of R/W state - enables three-state control during reads |
| UBL / UBR, LBL / LBR | Upper/Lower Byte Select | Enable 8-bit sub-bus segments: UBL/UBR drives I/O8–I/O15; LBL/LBR drives I/O0–I/O7 |
| SEML / SEMR | Semaphore Enable | Active-low; selects semaphore register access mode instead of main memory array |
| BUSYL / BUSYR | Busy Flag (Master Output / Slave Input) | M/S = VIH → BUSY is output (Master); M/S = VIL → BUSY is input (Slave); indicates port contention |
| M/S | Master/Slave Select | Configures device role in cascaded multi-chip systems; determines BUSY pin direction and arbitration priority |
| INTL / INTR | Interrupt Flag | Open-drain, active-low output signaling semaphore flag change or user-triggered interrupt event |
Key Features
| Feature | Design Value |
|---|---|
| True Dual-Port Architecture | Enables simultaneous, independent read/write access to identical memory locations without collision or arbitration delay |
| Hardware Semaphore Logic | Eight dedicated, atomic semaphore flags (A0–A2 addressed) with contention window (tSPS = 5 ns) for safe inter-processor synchronization |
| Master/Slave Cascading | Supports 32-bit+ data bus expansion using BUSY flag chaining; eliminates need for external glue logic in wide-memory systems |
| Byte-Level Write Control | Separate upper-byte (I/O8–I/O15) and lower-byte (I/O0–I/O7) enables allow partial-word writes without read-modify-write cycles |
| Asynchronous Port Operation | No shared clock required; each port operates at its own timing - ideal for heterogeneous processor/FPGA interfaces |
| Low-Power Standby Mode | 13 mA typical ISB1 current with TTL inputs; drops to 1.0 mA (ISB3) with CMOS-level high-Z control inputs |
Applications
| Telecom Line Card Buffering | FPGA-CPU Co-Processor Memory |
|---|---|
|
Use Scenario: High-throughput packet buffering between line interface ASIC and control-plane CPU in carrier-grade routers. IC Role / Device Role / Timing Role: Dual-port SRAM acts as zero-latency, contention-free FIFO between ingress/egress data paths and management processor. Use Value: 55 ns tRC enables >18 MHz sustained data transfer; hardware semaphores coordinate buffer ownership without software overhead. |
Use Scenario: Shared memory between Xilinx FPGA fabric and ARM Cortex-A9 application processor in industrial vision system. IC Role / Device Role / Timing Role: Provides synchronous, low-jitter memory interface where FPGA handles real-time image capture and CPU runs Linux stack. Use Value: Independent left/right timing eliminates clock domain crossing issues; byte-select enables efficient DMA transfers aligned to pixel boundaries. |
| Real-Time Motor Control Hub | Digital Signal Processor (DSP) Interleave Buffer |
|
Use Scenario: Centralized motion control unit coordinating multiple servo drives via deterministic shared memory. IC Role / Device Role / Timing Role: Serves as time-critical parameter exchange buffer between safety PLC and field-oriented control (FOC) DSP cores. Use Value: 55 ns access ensures sub-microsecond response to encoder interrupts; M/S configuration supports multi-axis master-slave topology. |
Use Scenario: Interleaved data staging between TI C6000 DSP and external ADC/DAC in radar signal processing chain. IC Role / Device Role / Timing Role: Buffers ping-pong FFT input/output frames while allowing concurrent DMA fill and algorithm execution. Use Value: Asynchronous ports decouple sampling rate (left port) from processing rate (right port); tHZ ≤ 25 ns ensures clean bus release for next DMA burst. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual-port SRAM applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CY7C1362BV33-55AXI | 4K x 16, 55 ns, 3.3 V, 100-pin TQFP - identical speed/package but Cypress uses different semaphore protocol and lacks M/S cascade logic | Requires external arbitration logic for multi-chip bus expansion; suitable only for standalone dual-port use | Select when migrating from Cypress designs or when semaphore usage is limited to single-device contexts |
| AS7C34098B-55PCN | 4K x 16, 55 ns, 3.3 V, 100-pin TQFP - no built-in semaphores or BUSY arbitration; pure dual-port SRAM with simpler control set | Cannot implement hardware mutexes or master/slave handshaking; requires FPGA/ASIC logic for inter-processor sync | Choose for cost-sensitive, non-contention applications where arbitration is handled externally |
Compared with CY7C1362BV33-55AXI and AS7C34098B-55PCN, the 70V25S55PF uniquely integrates full semaphore arbitration and M/S cascade capability - eliminating external logic in multi-processor systems while maintaining pin-compatible 100-TQFP footprint and identical 55 ns timing.
Availability
70V25S55PF is available at Aetrix Electronics and suitable for telecom infrastructure, industrial motor control, FPGA co-processing, and real-time DSP buffering requiring stable component supply and long-term obsolescence management.
Supply support for 70V25S55PF 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) was a fabless semiconductor company specializing in timing, memory interface, RF, and sensor solutions before its acquisition by Renesas Electronics in 2019. IDT emphasized high-performance, low-latency interface ICs for communications and computing.
The IDT70V25 family was designed specifically for deterministic, real-time inter-processor communication - delivering hardware-accelerated memory arbitration and seamless bus expansion in space-constrained embedded systems.
FAQ
What is the maximum operating frequency supported by the 70V25S55PF?
The 70V25S55PF does not operate on a clock; it is fully asynchronous. Its maximum sustained data rate is determined by the 55 ns read cycle time (tRC), supporting up to 18.2 million read operations per second. Write cycle time (tWC) is also 55 ns, enabling matched read/write bandwidth without pipeline stalls. This makes the 70V25S55PF suitable for systems where deterministic latency matters more than clocked throughput.
Does the 70V25S55PF support industrial temperature range?
No, the 70V25S55PF is specified only for commercial temperature range (0°C to +70°C). The "S" suffix denotes standard power grade, and the "55" specifies 55 ns speed - both tied to commercial-grade characterization. For industrial operation (-40°C to +85°C), IDT offered variants like 70V25L25PF (25 ns, low-power, industrial), but the 70V25S55PF itself is not qualified beyond 0°C to +70°C.
How does semaphore arbitration work on the 70V25S55PF?
Semaphore arbitration on the 70V25S55PF uses eight dedicated flags accessed via A0–A2 address lines when SEM is low and CE/UB/LB are high. Each flag supports atomic test-and-set via I/O0 write and broadcast read across all I/O pins. Contention is resolved within a 5 ns window (tSPS); if both ports attempt simultaneous semaphore access, the outcome is deterministic based on internal priority - no software polling or retry loops needed. This behavior is intrinsic to the 70V25S55PF silicon design.
Can the 70V25S55PF be used in a single-port configuration?
Yes, the 70V25S55PF can operate in single-port mode by tying one port's CE pin high (e.g., CER = VIH) and using only the other port's address, data, and control signals. In this mode, the disabled port enters low-power standby (ISB2 ≈ 70 mA typ.), and all arbitration, semaphore, and BUSY logic remains inactive. This preserves timing and power specs of the active port exactly as in dual-port operation - a verified use case documented in IDT's application notes for the 70V25 family.
What is the function of the M/S pin on the 70V25S55PF?
The M/S (Master/Slave Select) pin configures the 70V25S55PF's role in cascaded memory systems. When M/S = VIH, BUSY is an output flag indicating local port contention; when M/S = VIL, BUSY becomes an input that synchronizes write operations with upstream masters. This enables daisy-chained configurations for 32-bit+ data buses without external logic - a core capability of the 70V25S55PF that distinguishes it from basic dual-port SRAMs.
70V25S55PF 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:
- 128Kbit
- Memory Organization:
- 8K 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)
70V25S55PF FAQ
1.How can I place an order for 70V25S55PF through Aetrix?
Please submit a Request for Quotation (RFQ) for 70V25S55PF 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 70V25S55PF reliable?
The price and inventory of 70V25S55PF are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 70V25S55PF is usually 5 days.
3.What payment methods are accepted for 70V25S55PF?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 70V25S55PF transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 70V25S55PF?
70V25S55PF orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 70V25S55PF 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 70V25S55PF?
For technical support, including 70V25S55PF datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 70V25S55PF requirements.
6.How does Aetrix verify that 70V25S55PF is sourced from the original manufacturer or authorized distributors?
All 70V25S55PF 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 70V25S55PF meets industry standards.
7.What is the process for return or replacement of 70V25S55PF?
All 70V25S55PF units undergo pre-shipment inspection (PSI). If there is an issue with 70V25S55PF, 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 70V25S55PF part is unused and in its original packaging.
Return procedure for 70V25S55PF:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
70V25S55PF 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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24LC01BT-I/OT
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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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AT24C08C-STUM-T
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