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Renesas HD63266FV
- Part No.:
- HD63266FV
- Manufacturer:
- Renesas
- Category:
- Microcontrollers
- Package:
- -
- Datasheet:
-
HD63266FV.pdf
- Description:
- MCU 4-8BIT GENERAL
- Quantity:
- Payment:
- Shipping:
Inventory:3,813
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Product details
Overview
HD63266FV from Hitachi (now Renesas) is a CMOS floppy disk controller IC designed for 8-inch and 5.25-inch FDD interfacing in legacy industrial and embedded storage systems. It supports dual-density data transfer, includes integrated VFO, ALU, timer, and I/O port logic, and operates at +5 V with XTAL1/XTAL2 clock input.
For engineers reviewing the HD63266FV datasheet, HD63266FV pinout, HD63266FV application, or HD63266FV equivalent, key selection considerations include DMA handshake timing (DACK/DREQ), drive select capability (DS0–DS3), head control signals (HDIR/HLOAD/STEP), and format-select compatibility (SFORM/IFS).
Technical Context
The HD63266FV integrates a dedicated floppy disk interface controller with on-chip arithmetic logic unit (ALU), variable frequency oscillator (VFO), and programmable timer. It implements full seek, read, write, and format control logic via internal state machines and register-mapped I/O.
It features dual-mode operation selectable via 8"/5" pin, supports both MFM and FM encoding formats via SFORM/IFS, and provides four independent motor-on (MON0–MON3) and drive-select (DS0–DS3) outputs for multi-drive configurations.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | +5 V DC nominal; all logic and analog blocks operate from single rail |
| Data Bus Width | 8-bit bidirectional D0–D7; directly interfaces Z80/8086-style host CPU buses |
| DMA Interface | DREQ/ DACK/ DEND signals enable burst-mode data transfers without CPU intervention |
| Drive Support | Four drive select outputs (DS0–DS3) and four motor-on controls (MON0–MON3) |
| Head Control | HDIR (direction), HLOAD (load/unload), STEP (step pulse), and TRK0 (track zero detect) |
| Encoding Support | FM and MFM via SFORM and IFS pins; format selection is hardware-configurable |
| Interrupt & Status | IRQ output with RS0/RS1 register addressing; READY and WPRT provide real-time media status |
Pinout & Package
HD63266FV is housed in a 64-pin plastic quad flat package (PQFP) with 0.5 mm pitch, compliant with JEDEC MS-026 standard. Pin numbering follows standard counter-clockwise orientation from top-left corner (Pin 1 marked).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | 8"/5" | Selects physical drive geometry mode: high = 8", low = 5.25" |
| 2 | XTALSEL | Chooses between internal VFO or external crystal clock source |
| 3 | RESET | Active-low asynchronous reset; initializes internal registers and state machines |
| 4 | E, RD | Chip enable / read strobe; enables data read from D0–D7 bus |
| 5 | R/W, WR | Read/write direction control; active-low write strobe for register/data writes |
| 6 | CS | Chip select input; must be low for register access or command execution |
| 20 | WPRT | Write-protect sense input; high = media write-protected, prevents write commands |
| 33 | TRK0 | Track zero detection input; used for seek calibration and home positioning |
| 34 | INDEX | Index hole pulse input; synchronizes sector timing during rotation |
| 35 | RDATA | Serial read data input from floppy head; fed to internal VFO and data separator |
| 49–52 | MON0–MON3 | Motor-on outputs; open-drain, active-high; control spindle motors per drive |
| 53–57 | DS0–DS3 | Drive select outputs; active-high, selects one of four connected FDD units |
| 63 | HDIR | Head direction output; controls stepper motor winding polarity for track movement |
| 50 | HLOAD | Head load output; engages read/write head onto disk surface |
| 48 | STEP | Step pulse output; advances head by one track per pulse edge |
Key Features
| Feature | Design Value |
|---|---|
| Integrated VFO | On-chip variable frequency oscillator eliminates need for external PLL or data separator IC |
| Hardware Format Control | SFORM and IFS pins allow runtime switching between FM and MFM encoding without firmware change |
| Dual-Density Support | Configurable via 8"/5" pin and internal register settings for 250/300/500 kbps data rates |
| Multi-Drive Management | Four independent DSx/MONx outputs enable daisy-chained or parallel FDD configurations |
| Register-Mapped I/O | RS0/RS1 address two-bit register bank; supports 4×8-bit control/status registers accessible over D0–D7 |
Applications
| Industrial CNC Controller Storage | Legacy Medical Imaging Archive |
|---|---|
Use Scenario: CNC machine tool controllers require non-volatile, mechanically robust storage for G-code programs and calibration tables. IC Role / Device Role / Timing Role: HD63266FV acts as the primary floppy disk interface controller, managing low-level sector reads/writes and head positioning. Use Value: Enables direct integration of 5.25" or 8" floppy drives without external data separator or motor driver ICs. | Use Scenario: Early MRI and CT systems stored image frames and diagnostic logs on formatted floppy disks before network archiving. IC Role / Device Role / Timing Role: HD63266FV handles synchronous serial data capture from digitized analog front-end, buffering into RAM via DMA. Use Value: Provides deterministic timing for index-locked sector reads and write-protect enforcement during critical data logging. |
| Avionics Maintenance Terminal | Retro Computing Restoration |
Use Scenario: Ground-based avionics test sets use floppy media to load aircraft configuration files and flight log dumps. IC Role / Device Role / Timing Role: HD63266FV serves as the host-side FDC, interpreting command sequences (e.g., READ ID, FORMAT TRACK) per ECMA-63. Use Value: Supports dual-density MFM formatting required for legacy ARINC 429-compatible maintenance software distribution. | Use Scenario: Enthusiasts restoring vintage 1980s Japanese computers (e.g., NEC PC-8801, Fujitsu FM-7) need authentic FDC replacement. IC Role / Device Role / Timing Role: HD63266FV replicates original system behavior including IRQ timing, DREQ latency, and step-pulse jitter specs. Use Value: Matches pinout and electrical timing of original Hitachi design, enabling drop-in PCB replacement without adapter or firmware patch. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar floppy disk controller applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| WD37C65 | CMOS implementation with identical register map but no integrated VFO; requires external data separator | Lacks on-chip VFO and motor control outputs; needs discrete MON/DS drivers | Choose when replacing legacy WD-based designs where external VFO already exists |
| Intel 8272A | Bipolar NMOS process; higher power, no MON/DS outputs; requires external drive logic | Only supports single-drive operation; no hardware format switching (SFORM/IFS) | Prefer for strict 8272A register compatibility in retro BIOS environments |
Compared with WD37C65 and Intel 8272A, the HD63266FV delivers integrated motor control, hardware format selection, and on-die VFO - reducing BOM count by up to 5 components while supporting multi-drive industrial FDD systems.
Availability
HD63266FV is available at Aetrix Electronics and suitable for industrial CNC controllers, legacy medical imaging archive systems, and avionics maintenance terminals requiring stable component supply across extended product lifecycles.
Supply support for HD63266FV 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
Hitachi Semiconductor (now part of Renesas Electronics) developed high-reliability microcontrollers and peripheral ICs for industrial, automotive, and computing applications from the 1970s through early 2000s.
The HD63266FV belongs to Hitachi's HD632xx family of floppy disk controllers, engineered specifically for embedded systems requiring self-contained, low-pin-count FDD interfacing with minimal external components.
FAQ
What is the operating voltage range for the HD63266FV?
The HD63266FV is specified for single-supply operation at +5 V ±5%, with all I/O and internal logic referenced to this rail. It does not support 3.3 V or mixed-voltage operation. The HD63266FV datasheet confirms VDD tolerance and noise margin requirements under load, and operation outside this range may cause register corruption or loss of DMA synchronization.
Does the HD63266FV support both FM and MFM encoding formats?
Yes, the HD63266FV supports both FM and MFM encoding via hardware pins SFORM and IFS, allowing format selection without register writes. This dual-format capability is confirmed in the HD63266FV functional description and timing diagrams, and enables compatibility with legacy 8" Shugart and 5.25" IBM-standard floppy media.
How many floppy drives can the HD63266FV control simultaneously?
The HD63266FV provides four independent drive select outputs (DS0–DS3) and four motor-on signals (MON0–MON3), enabling direct control of up to four physical floppy drives. Each DSx/MONx pair is electrically isolated in the HD63266FV internal architecture, and timing specifications guarantee staggered activation for multi-drive spin-up sequences.
Is the HD63266FV pin-compatible with the WD37C65 or Intel 8272A?
No, the HD63266FV is not pin-compatible with either the WD37C65 or Intel 8272A. Its 64-pin PQFP layout, signal assignment (e.g., MONx, DSx, SFORM), and power pin distribution differ fundamentally. While register-level similarities exist with WD37C65, the HD63266FV requires custom PCB layout and cannot serve as a drop-in replacement.
What clock sources does the HD63266FV accept?
The HD63266FV accepts either an external crystal (via XTAL1/XTAL2) or an external TTL/CMOS clock signal (selected by XTALSEL). When using crystal mode, the HD63266FV drives the crystal directly; no external capacitors are required per the manufacturer's recommended circuit. Frequency range is 4–8 MHz depending on density mode.
HD63266FV Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Renesas
- Package/Case:
- -
- Series:
- *
- Packaging:
- Bulk
- Product Status:
- Active
- Programmable:
- Not Verified
- Core Processor:
- -
- Core Size:
- -
- Speed:
- -
- Connectivity:
- -
- Peripherals:
- -
- Number of I/O:
- -
- Program Memory Size:
- -
- Program Memory Type:
- -
- EEPROM Size:
- -
- RAM Size:
- -
- Voltage - Supply (Vcc/Vdd):
- -
- Data Converters:
- -
- Oscillator Type:
- -
- Operating Temperature:
- -
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- -
- Supplier Device Package:
HD63266FV FAQ
1.How can I place an order for HD63266FV through Aetrix?
Please submit a Request for Quotation (RFQ) for HD63266FV 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 HD63266FV reliable?
The price and inventory of HD63266FV are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HD63266FV is usually 5 days.
3.What payment methods are accepted for HD63266FV?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HD63266FV transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HD63266FV?
HD63266FV orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HD63266FV 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 HD63266FV?
For technical support, including HD63266FV datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HD63266FV requirements.
6.How does Aetrix verify that HD63266FV is sourced from the original manufacturer or authorized distributors?
All HD63266FV 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 HD63266FV meets industry standards.
7.What is the process for return or replacement of HD63266FV?
All HD63266FV units undergo pre-shipment inspection (PSI). If there is an issue with HD63266FV, 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 HD63266FV part is unused and in its original packaging.
Return procedure for HD63266FV:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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