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Texas Instruments CD74HCT564MG4
- Part No.:
- CD74HCT564MG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT564MG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:3,232
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Product details
Overview
CD74HCT564MG4 from Texas Instruments is a high-speed CMOS octal D-type flip-flop with three-state inverting outputs, positive-edge clock triggering, and buffered inputs. It operates at 4.5 V to 5.5 V, delivers 15 LSTTL load drive capability, exhibits 14 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and supports –55°C to +125°C industrial/military temperature range. It is used for bus-oriented data latching and interface isolation in embedded control systems.
For engineers reviewing the CD74HCT564MG4 datasheet, CD74HCT564MG4 pinout, CD74HCT564MG4 application, or CD74HCT564MG4 equivalent, key selection criteria include its HCT-family TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), three-state output enable control, inverted Q-output logic, and SOIC-20 package compatibility with legacy 74LS574-style board layouts.
Technical Context
The CD74HCT564MG4 implements eight independent D-type latches with synchronous positive-edge clocking and a shared active-low output enable (OE) that places all Q outputs into high-impedance state. Its internal structure includes Schmitt-triggered input buffers for noise immunity and complementary CMOS output drivers rated for ±25 mA per pin.
Unlike the CD74HCT534, the CD74HCT564MG4 features an inverted output configuration (Q̅), with identical timing parameters including 3 ns minimum data hold time and 20 ns maximum setup time at 5 V. It maintains full functional equivalence with standard LS574 logic but with CMOS power efficiency and wider voltage tolerance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) enable direct replacement of 74LS574 without level-shifting. |
| Supply Voltage Range | 4.5 V to 5.5 V - Ensures stable operation across noisy 5 V rails and meets MIL-STD-704/DO-160 voltage tolerance requirements. |
| Propagation Delay (tPLH/tPHL) | 14 ns typical (VCC = 5 V, CL = 15 pF) - Supports reliable 50 MHz clock domains in synchronous bus interfaces. |
| Output Drive Strength | 15 LSTTL loads - Sufficient to drive multiple legacy TTL receivers on shared data buses without external buffers. |
| Operating Temperature | –55°C to +125°C - Qualified for extended-temperature industrial, aerospace, and defense applications. |
| Three-State Enable Time (tPZH) | 35 ns max (VCC = 5 V, CL = 50 pF) - Enables precise bus arbitration timing in multi-master systems. |
| Input Capacitance (CI) | 10 pF - Minimizes loading on upstream drivers and preserves signal integrity in high-speed fanout configurations. |
Pinout & Package
CD74HCT564MG4 is housed in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard 0.050″ (1.27 mm) lead pitch and RoHS-compliant NiPdAu lead finish. It is moisture sensitivity level (MSL) 1 rated for unlimited floor life at ≤30°C/60% RH.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock Input | Positive-edge triggered master clock; requires clean 5 V transition with <30 ns rise/fall time for reliable sampling. |
| 2–9 (D0–D7) | Data Inputs | Asynchronous D inputs; each accepts TTL-compatible logic levels and drives internal latch on CP↑. |
| 10 (GND) | Ground Reference | Primary return path for all I/O and core logic; must be low-inductance connection to minimize ground bounce. |
| 11–18 (Q̅0–Q̅7) | Inverted Three-State Outputs | Active-high OE enables inverted latched data; outputs enter high-Z when OE = HIGH. |
| 19 (OE) | Output Enable | Active-low control; asserts all Q̅ outputs simultaneously - critical for bus contention avoidance. |
| 20 (VCC) | Power Supply | 5 V ±0.5 V supply; requires local 0.1 µF ceramic bypass capacitor placed within 3 mm of pin. |
Key Features
| Feature | Design Value |
|---|---|
| Inverting three-state outputs | Enables bidirectional bus topology with single-direction data flow and hardware-controlled tristate arbitration. |
| Buffered TTL-compatible inputs | Eliminates need for external level shifters when interfacing with 74LS/ALS logic families or microcontroller GPIOs. |
| 15 LSTTL load drive capability | Reduces system component count by driving up to 15 legacy TTL inputs directly from one device. |
| –55°C to +125°C operating range | Supports deployment in under-hood automotive ECUs, avionics cabinets, and outdoor industrial controllers. |
| Low dynamic power (CPD = 36 pF) | Reduces switching current consumption in high-frequency bus applications versus bipolar 74LS574 equivalents. |
Applications
| Industrial PLC Backplane Interface | Aerospace Avionics Data Bus |
|---|---|
Use Scenario: Isolating and latching sensor data from analog-to-digital converters onto a shared 8-bit parallel backplane in modular I/O racks. IC Role / Device Role / Timing Role: Octal D-latch synchronizing asynchronous ADC conversion complete signals to a centralized 5 MHz system clock domain. Use Value: Inverted outputs prevent bus contention during hot-swap module insertion; three-state control allows dynamic bus ownership handoff between CPU and watchdog modules. |
Use Scenario: Buffering discrete command signals from flight control computers to actuator driver boards in fly-by-wire systems. IC Role / Device Role / Timing Role: Positive-edge triggered register capturing safety-critical commands while rejecting transient noise via Schmitt-triggered inputs. Use Value: Extended temperature rating ensures reliability at –55°C cold-soak and +125°C engine bay operation; MSL-1 packaging supports reflow assembly in high-reliability PCBs. |
| Military Radios Baseband Processing | Test Equipment Digital Pattern Generator |
Use Scenario: Holding encrypted digital audio frames in secure voice radios prior to RF modulation, with real-time channel switching. IC Role / Device Role / Timing Role: High-speed octal latch enabling sub-microsecond latency between encryption engine output and DAC interface. Use Value: 14 ns propagation delay ensures deterministic timing alignment across eight parallel data lanes; HCT inputs tolerate wide-voltage swing from FPGA I/O banks. |
Use Scenario: Generating repeatable 8-bit stimulus patterns for IC functional testing, synchronized to arbitrary waveform generator clocks. IC Role / Device Role / Timing Role: Edge-triggered storage element capturing pattern data from microcontroller RAM and presenting it to DUT pins. Use Value: Three-state outputs allow seamless integration into multi-channel test fixtures; SOIC-20 footprint matches legacy ATE socket tooling. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type latch applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT574N | Non-inverting Q outputs; identical pinout, timing, and DC specs except output polarity. | Requires logic inversion in downstream circuitry if Q̅ functionality is mandatory. | Select SN74HCT574N only when non-inverted outputs align with existing schematic design or reduce gate count. |
| CD74HCT534MG4 | Same family, same package, but non-inverting outputs and different pin mapping (Q0–Q7 vs Q̅0–Q̅7). | Not pin-compatible; requires PCB redesign due to swapped output pin locations (pins 11–18 vs pins 19–12). | Choose CD74HCT534MG4 only when redesigning for non-inverted outputs and layout flexibility is available. |
Compared with SN74HCT574N and CD74HCT534MG4, the CD74HCT564MG4 uniquely provides inverted outputs in the exact pinout required for drop-in replacement of military-grade CD54HCT564F3A devices, preserving legacy board designs while delivering modern CMOS reliability and thermal performance.
Availability
CD74HCT564MG4 is available at Aetrix Electronics and suitable for industrial automation, aerospace avionics, and defense electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT564MG4 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and logic solutions with over 90 years of innovation in high-reliability components.
The CD74HCT564MG4 belongs to TI's industry-standard 74HCT logic family, designed specifically for drop-in replacement of legacy 74LS devices in harsh-environment applications demanding wide temperature operation and robust noise immunity.
FAQ
What is the maximum clock frequency supported by the CD74HCT564MG4?
The CD74HCT564MG4 supports a maximum clock frequency of 50 MHz under recommended operating conditions (VCC = 5 V, CL = 15 pF, TA = 25°C). At full temperature range (–55°C to +125°C), the guaranteed maximum is 16 MHz per datasheet Section 5.5. This makes CD74HCT564MG4 suitable for high-speed control bus applications where deterministic timing is essential.
Does the CD74HCT564MG4 require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs on the CD74HCT564MG4 must be terminated to a defined logic level (VCC or GND) per TI layout guidelines. Floating inputs can cause increased ICC, erratic output behavior, or ESD susceptibility. For CD74HCT564MG4, tie unused D inputs to GND or VCC depending on desired default latch state; OE should be pulled LOW if permanently enabled or HIGH if permanently disabled.
Is the CD74HCT564MG4 pin-compatible with the 74LS574?
No - while the CD74HCT564MG4 is functionally compatible with the 74LS574 (same pin count and basic latch behavior), it is not pin-compatible due to differing output polarity and internal pin mapping. The CD74HCT564MG4 outputs Q̅ on pins 11–18, whereas the 74LS574 outputs Q on those pins. Direct replacement requires either logic inversion or PCB modification.
What is the purpose of the "G4" suffix in CD74HCT564MG4?
The "G4" suffix in CD74HCT564MG4 indicates TI's green packaging standard: RoHS-compliant, lead-free (NiPdAu finish), and halogen-free materials. It does not denote a functional revision - CD74HCT564MG4 shares identical electrical specifications, timing, and thermal characteristics with CD74HCT564M, differing only in environmental compliance and marking.
Can the CD74HCT564MG4 be used with 3.3 V microcontrollers?
No - the CD74HCT564MG4 is specified only for 4.5 V to 5.5 V operation and requires TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V). Driving its inputs directly from 3.3 V logic violates the minimum VIH requirement and risks unreliable switching. A level translator or 5 V-tolerant MCU GPIO is required for interoperability with 3.3 V systems.
CD74HCT564MG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 35ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 6mA, 6mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
CD74HCT564MG4 FAQ
1.How can I place an order for CD74HCT564MG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT564MG4 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 CD74HCT564MG4 reliable?
The price and inventory of CD74HCT564MG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT564MG4 is usually 5 days.
3.What payment methods are accepted for CD74HCT564MG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT564MG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT564MG4?
CD74HCT564MG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT564MG4 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 CD74HCT564MG4?
For technical support, including CD74HCT564MG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT564MG4 requirements.
6.How does Aetrix verify that CD74HCT564MG4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT564MG4 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 CD74HCT564MG4 meets industry standards.
7.What is the process for return or replacement of CD74HCT564MG4?
All CD74HCT564MG4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT564MG4, 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 CD74HCT564MG4 part is unused and in its original packaging.
Return procedure for CD74HCT564MG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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