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STMicroelectronics M74HC564B1R
- Part No.:
- M74HC564B1R
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
M74HC564B1R.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:2,050
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Product details
Overview
M74HC564B1R from STMicroelectronics is an octal D-type flip-flop with inverting 3-state outputs, designed for high-speed synchronous data latching and bus isolation in digital systems. It operates from 2V to 6V, delivers 90MHz max clock frequency (typ. at VCC = 6V), features symmetrical 6mA output drive, and maintains high noise immunity (VNIH/VNIL ≥ 28% VCC). It is used in address/data bus buffering and register file interfaces in industrial control logic.
For engineers reviewing the M74HC564B1R datasheet, M74HC564B1R pinout, M74HC564B1R application, or M74HC564B1R equivalent, key selection criteria include its inverting 3-state output behavior, clock-edge-triggered D-latch function, wide supply range, low 4µA quiescent current, and DIP-20 package compatibility with legacy 74-series layouts.
Technical Context
The M74HC564B1R implements eight independent edge-triggered D flip-flops, each sampling Dn inputs on the rising edge of CK and updating Qn outputs accordingly. Its 3-state output control is active-low via OE, enabling bus sharing without affecting internal state retention.
All inputs include ESD protection diodes; propagation delays are balanced (tPLH ≅ tPHL), and output impedance is symmetrical (|IOH| = IOL ≥ 6mA). The device uses silicon gate C2MOS technology for low power and high noise margin across –55°C to +125°C operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| VCC Range | 2V to 6V - supports mixed-voltage system interfacing and battery-powered logic |
| fMAX | 90MHz (typ. at VCC = 6V) - enables high-throughput data capture in timing-critical control paths |
| ICC (Quiescent) | 4µA (max. at TA = 25°C) - minimizes standby power in always-on industrial registers |
| IOH/IOL | ≥6mA - drives standard TTL loads and multiple CMOS inputs without buffering |
| VNIH/VNIL | ≥28% VCC - ensures robust operation in electrically noisy factory-floor environments |
| tPLH/tPHL | 15ns (typ. at VCC = 6V, CL = 50pF) - guarantees tight setup/hold timing margins in synchronous buses |
| CPD | 54pF - allows accurate dynamic power estimation under varying clock frequencies |
Pinout & Package
Package: Plastic DIP-20 (0.300" width), through-hole mounting, JEDEC MS-001 compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | OE | Active-low 3-state output enable - decouples outputs from bus while preserving internal latch state |
| 2–9 | D0–D7 | Data inputs - sampled synchronously on rising CK edge; tolerate VI = 0 to VCC |
| 11 | CK | Clock input - rising-edge triggered; min. pulse width 6ns (at VCC = 6V) |
| 12–19 | Q0–Q7 | Inverting 3-state outputs - Qn = NOT(Dn) when OE = L; high-Z when OE = H |
| 10 | GND | Ground reference - return path for all input/output currents and internal logic |
| 20 | VCC | Positive supply - powers internal logic and output drivers; bypass capacitor recommended |
Key Features
| Feature | Design Value |
|---|---|
| Inverting 3-state outputs | Enables bidirectional bus arbitration without external inverters or direction control logic |
| Symmetrical output drive | Equal sourcing/sinking capability (≥6mA) simplifies PCB trace design and load matching |
| Balanced propagation delays | tPLH ≅ tPHL minimizes skew between rising/falling output transitions in timing-critical paths |
| Wide temperature range | –55°C to +125°C operation supports deployment in uncontrolled industrial enclosures |
| ESD-protected inputs | ±20mA diode clamp current rating protects against handling and system-level transients |
Applications
| Industrial PLC I/O Expansion | Legacy Bus Interface Adapter |
|---|---|
Use Scenario: Expanding discrete input/output points in programmable logic controllers using parallel backplane buses. IC Role / Device Role / Timing Role: Octal latch capturing sensor status or actuator commands synchronized to a master clock. Use Value: Inverting outputs directly match common optocoupler input polarity; 3-state enables shared bus arbitration with other modules. | Use Scenario: Bridging modern microcontrollers to legacy 8-bit ISA or VMEbus peripherals requiring 74-series-compatible timing. IC Role / Device Role / Timing Role: Data register providing level-shifted, edge-aligned interface between mismatched voltage domains. Use Value: 2–6V supply range accommodates both 3.3V MCU cores and 5V peripheral rails without level shifters. |
| Test Equipment Pattern Generator | Motor Drive Control Register |
Use Scenario: Storing and outputting precise digital stimulus patterns in automated test systems. IC Role / Device Role / Timing Role: Synchronous waveform memory element clocked by pattern generator timing engine. Use Value: 90MHz fMAX supports >10MHz pattern update rates; low 15ns propagation delay ensures sub-cycle timing accuracy. | Use Scenario: Holding PWM enable/disable states and fault flags for multi-phase motor gate drivers. IC Role / Device Role / Timing Role: Isolated control register latching safety-critical signals before delivery to isolated gate drivers. Use Value: High noise immunity (28% VCC) prevents spurious toggling in high-dV/dt motor drive environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC574N | Non-inverting outputs; identical pinout except Q0–Q7 polarity | Requires external inversion for inverting logic paths; otherwise drop-in for non-inverting bus latching | Select when system logic expects true (non-inverted) Q outputs and OE-controlled tristate behavior |
| 74AC564PC | Faster tPLH/tPHL (9ns typ.), higher ICC (80µA max), narrower VCC range (2V–5.5V) | Better suited for high-speed clock domains but less tolerant of 6V rail or ultra-low-power sleep modes | Prefer for timing-critical designs where 90MHz+ operation is required and 6V supply is not used |
Compared with SN74HC574N and 74AC564PC, the M74HC564B1R uniquely combines inverting outputs, 6V tolerance, and 4µA quiescent current-making it optimal for low-power, noise-prone industrial bus interfaces where signal polarity must be inverted at the latch stage.
Availability
M74HC564B1R is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, legacy bus interface adapters, test equipment pattern generators, and motor drive control registers requiring stable component supply and long-term obsolescence management.
Supply support for M74HC564B1R 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing and broad analog/mixed-signal portfolio.
The M74HC564 belongs to ST's high-speed CMOS logic family, engineered for pin- and function-compatibility with legacy 74-series devices while delivering improved speed, noise immunity, and power efficiency for industrial control upgrades.
FAQ
What is the logic polarity of the Q outputs relative to D inputs?
The M74HC564B1R provides inverting outputs: when OE is low and CK rises, Qn = NOT(Dn). This is confirmed by the truth table and logic diagram in the official ST datasheet (Rev. 11, page 2). No external inverters are needed to achieve complemented bus signaling.
Can M74HC564B1R operate reliably at 3.3V supply?
Yes - the device is fully specified from 2V to 6V. At VCC = 3.3V, VIH = 2.31V (min), VIL = 0.99V (max), and IOH/IOL ≥ 4mA, meeting standard 3.3V CMOS interface requirements. Propagation delay is ~22ns (typ.), supporting >30MHz clocking.
Is the clock input sensitive to slow rise/fall times?
Yes - AC specs assume input tr/tf ≤ 400ns (at VCC = 6V). Exceeding this (e.g., >1µs) may cause metastability or missed clock edges. For slow clocks, use Schmitt-trigger buffers or ensure tr/tf ≤ 500ns per the recommended operating conditions (page 3).
Does OE affect internal flip-flop state retention during high-impedance mode?
No - the OE signal only gates the output drivers. Internal latches retain their state regardless of OE level. New data can be clocked in, and old data preserved, even while outputs are in high-impedance - confirmed in the functional description (page 1) and truth table (page 2).
M74HC564B1R Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 90 MHz
- Max Propagation Delay @ V, Max CL:
- 32ns @ 6V, 150pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 20-DIP
M74HC564B1R FAQ
1.How can I place an order for M74HC564B1R through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC564B1R 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 M74HC564B1R reliable?
The price and inventory of M74HC564B1R are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC564B1R is usually 5 days.
3.What payment methods are accepted for M74HC564B1R?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC564B1R transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for M74HC564B1R?
M74HC564B1R orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC564B1R 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 M74HC564B1R?
For technical support, including M74HC564B1R datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC564B1R requirements.
6.How does Aetrix verify that M74HC564B1R is sourced from the original manufacturer or authorized distributors?
All M74HC564B1R 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 M74HC564B1R meets industry standards.
7.What is the process for return or replacement of M74HC564B1R?
All M74HC564B1R units undergo pre-shipment inspection (PSI). If there is an issue with M74HC564B1R, 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 M74HC564B1R part is unused and in its original packaging.
Return procedure for M74HC564B1R:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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