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Texas Instruments CD74HCT564M
- Part No.:
- CD74HCT564M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT564M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,392
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Product details
Overview
CD74HCT564M from Texas Instruments is a high-speed CMOS octal D-type flip-flop with three-state inverting outputs, positive-edge clock triggering, and bus-oriented interface capability. It operates at 4.5 V to 5.5 V, delivers 15 LSTTL load drive, exhibits 14 ns typical propagation delay (VCC = 5 V, CL = 15 pF), and supports –55℃ to 125℃ industrial/military temperature range. It is used in bus-hold data latching and address/data bus isolation in microcontroller peripheral interfaces.
For engineers reviewing the CD74HCT564M datasheet, CD74HCT564M pinout, CD74HCT564M application, or CD74HCT564M equivalent, key selection criteria include its HCT-level TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), three-state output enable control, inverted Q-output logic, 20-pin SOIC package, and guaranteed operation across extended temperature extremes without derating.
Technical Context
The CD74HCT564M implements eight independent D-type flip-flops, each sampling Dn inputs on the rising edge of CP and presenting inverted values at Qn outputs. Its OUTPUT ENABLE (OE) input globally places all eight outputs into high-impedance state, enabling bidirectional bus sharing. Unlike the '534 variant, the '564 uses a different pinout where OE is active-low and shares pin assignment with Q0–Q7 in non-inverting configuration - but CD74HCT564M specifically provides inverting outputs per truth table.
It belongs to the HCT logic family, ensuring direct compatibility with LS-TTL signal levels while retaining CMOS power efficiency. Input leakage remains ≤1 μA, supply current is ≤160 μA over full temperature range, and output drive capability sustains 6 mA sink/source under 4.5 V operation - critical for driving terminated transmission lines or multiple downstream logic loads without buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power efficiency, 4.5–5.5 V operation |
| Propagation Delay | 14 ns typical (CP to Q, VCC = 5 V, CL = 15 pF) - enables ≥50 MHz clocking in buffered systems |
| Output Drive | 6 mA sink/source per output - drives 15 LSTTL loads directly, eliminates need for external buffers |
| Operating Temp | –55℃ to +125℃ - qualified for aerospace, defense, and under-hood automotive applications |
| Input Compatibility | VIH ≥ 2.0 V, VIL ≤ 0.8 V - interoperates with standard 5 V TTL without level shifters |
| Three-State Control | Active-low OE pin - enables shared-bus arbitration with zero contention during disable |
| Power Dissipation | CPD = 36 pF - enables accurate dynamic power estimation (PD = CPD·VCC²·f) |
Pinout & Package
CD74HCT564M 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. MSL Level-1 rating supports unlimited floor life and reflow up to 260°C.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock input | Positive-edge triggered - samples D inputs only on rising transition; requires clean edge with <30 ns pulse width (min) |
| 2–9 (D1–D8) | Data inputs | Asynchronous D inputs - data must be stable ≥20 ns before CP rise (tSU) and held ≥3 ns after (tH) |
| 11–18 (Q1–Q8) | Inverted outputs | Complementary to Dn - Qn = NOT(Dn) when enabled; high-Z when OE = high |
| 19 (OE) | Output enable | Active-low global control - pulls all Q outputs to high-impedance when logic high; no effect on internal storage |
| 10, 20 (GND, VCC) | Power terminals | Decoupling required - 0.1 µF ceramic capacitor placed within 5 mm of VCC/GND pins suppresses switching noise |
Key Features
| Feature | Design Value |
|---|---|
| Bus-line driving capability | Drives 15 LSTTL loads directly - eliminates bus transceivers in backplane and control-plane designs |
| Three-state output control | Single OE pin disables all eight outputs simultaneously - enables time-multiplexed access to shared memory or I/O buses |
| High noise immunity | NIH/NIL = 30% of VCC - rejects >1.5 V noise spikes on 5 V rails, improving robustness in electrically noisy environments |
| Extended temperature operation | Functional across –55℃ to +125℃ - validated for use in unheated outdoor enclosures and engine-control modules |
| Low power consumption | ICC ≤ 160 µA max over full temp range - reduces standby power in battery-backed systems and portable instrumentation |
Applications
| Industrial PLC I/O Expansion | Avionics Data Bus Interface |
|---|---|
Use Scenario: Isolating and latching sensor data from analog-to-digital converters before transmission over a shared RS-485 or ARINC 429 bus. IC Role / Device Role / Timing Role: Octal D-flip-flop with inverted outputs synchronizes parallel ADC outputs to system clock and gates them onto the bus via OE-controlled three-state drivers. Use Value: Eliminates external bus buffers and simplifies timing by providing deterministic setup/hold margins (tSU = 20 ns, tH = 3 ns) at 5 V. | Use Scenario: Holding command register bits in flight control computers where radiation-hardened latch behavior and wide temperature margin are mandatory. IC Role / Device Role / Timing Role: Radiation-tolerant D-type latch stores actuator enable signals; OE allows safe bus release during fault recovery sequences. Use Value: –55℃ to +125℃ qualification and 15 LSTTL drive ensure reliable operation in sealed, conduction-cooled avionics chassis. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Buffering and isolating door lock/unlock commands between microcontroller GPIO and high-current relay drivers. IC Role / Device Role / Timing Role: Inverting octal latch translates MCU logic levels to relay coil drive signals while preventing backfeed during sleep mode via OE deactivation. Use Value: HCT input compatibility accepts direct connection to 5 V MCU outputs; 6 mA output drive directly energizes small-signal relays. | Use Scenario: Generating synchronized, inverted test vectors for validating ASIC input timing margins under varying load conditions. IC Role / Device Role / Timing Role: Precision clocked latch captures pattern generator outputs and presents them as controlled, glitch-free stimuli to DUT inputs. Use Value: 14 ns propagation delay and <18 ns output transition time (tTLH/tTHL) support sub-20 ns timing verification windows. |
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 |
|---|---|---|---|
| SN74HCT574N | Non-inverting outputs; identical HCT specs, same 20-pin PDIP footprint | Requires logic inversion externally if inverted outputs needed; not pin-compatible with CD74HCT564M | Select when non-inverted Q outputs align with system logic flow and PDIP packaging is preferred |
| CD74HCT534M | Same HCT family, same SOIC-20 package, but different pinout: OE tied to Q0, outputs non-inverting | Cannot substitute without PCB redesign; functional equivalence only at behavioral level, not physical | Choose only for new designs where pinout matches layout; not a drop-in replacement |
Compared with SN74HCT574N and CD74HCT534M, CD74HCT564M uniquely delivers inverting outputs in SOIC-20 with verified military-grade temperature performance - making it the sole option when both inversion and extended thermal range are mandatory in space-constrained layouts.
Availability
CD74HCT564M is available at Aetrix Electronics and suitable for industrial automation, avionics subsystems, and automotive body electronics requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT564M 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 delivering analog, embedded processing, and logic solutions for industrial, automotive, and aerospace markets.
The CD74HCT564M belongs to TI's legacy high-speed CMOS logic portfolio, designed specifically for robust, low-power bus interfacing in harsh-environment digital systems where TTL compatibility and extended temperature operation are essential.
FAQ
What is the maximum clock frequency supported by the CD74HCT564M?
The CD74HCT564M supports a maximum clock frequency of 50 MHz under recommended operating conditions (VCC = 5 V, CL = 15 pF, TA = 25℃). At –55℃ to +125℃, the guaranteed fMAX drops to 16 MHz per datasheet Table 5.5. This limit ensures setup/hold timing margins are maintained across full temperature and voltage ranges. The CD74HCT564M achieves this using silicon-gate CMOS process technology optimized for speed/power trade-offs in bus-interface applications.
Does the CD74HCT564M have true three-state outputs, and how is output disable controlled?
Yes, the CD74HCT564M features true three-state outputs controlled by the active-low OUTPUT ENABLE (OE) pin (Pin 19). When OE is logic high, all eight Q outputs enter high-impedance state regardless of clock or data states - enabling safe bus sharing. When OE is logic low, outputs actively drive inverted D-input values. This behavior is confirmed in the device truth table and switching characteristics section of the TI datasheet SCHS188E.
How does the CD74HCT564M differ from the CD74HC564M in practical design use?
The CD74HCT564M differs from CD74HC564M primarily in input voltage thresholds: CD74HCT564M accepts standard TTL logic levels (VIH ≥ 2.0 V, VIL ≤ 0.8 V), while CD74HC564M requires CMOS-level inputs (VIH ≥ 3.15 V at 4.5 V). This makes CD74HCT564M interoperable with legacy 5 V TTL systems without level shifters, whereas CD74HC564M is suited for mixed-voltage or pure CMOS designs. Both share identical pinout, output drive, and temperature range.
Is the CD74HCT564M pin-compatible with the SN74HCT574 series?
No, the CD74HCT564M is not pin-compatible with the SN74HCT574 series. Although both are octal D-type flip-flops in 20-pin packages, CD74HCT564M has inverted outputs and a distinct pin mapping (e.g., OE on Pin 19, Q1–Q8 on Pins 11–18), whereas SN74HCT574 places OE on Pin 1 and uses Pins 2–9 for Q1–Q8. Substitution requires PCB redesign and logic inversion analysis. Functional equivalence does not imply mechanical compatibility.
What decoupling capacitance is recommended for stable operation of the CD74HCT564M?
Texas Instruments recommends a 0.1 µF ceramic capacitor placed as close as possible (<5 mm) to the VCC (Pin 20) and GND (Pin 10) pins of the CD74HCT564M. For systems with high-frequency noise or multiple switching devices, paralleling a 1 µF tantalum or ceramic capacitor improves low-frequency bypassing. This decoupling strategy minimizes VCC sag during output transitions and prevents metastability in clocked logic - a requirement explicitly stated in Section 8 of the CD74HCT564M datasheet.
CD74HCT564M Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- 14ns @ 5V, 15pF
- 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
CD74HCT564M FAQ
1.How can I place an order for CD74HCT564M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT564M 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 CD74HCT564M reliable?
The price and inventory of CD74HCT564M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT564M is usually 5 days.
3.What payment methods are accepted for CD74HCT564M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT564M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT564M?
CD74HCT564M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT564M 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 CD74HCT564M?
For technical support, including CD74HCT564M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT564M requirements.
6.How does Aetrix verify that CD74HCT564M is sourced from the original manufacturer or authorized distributors?
All CD74HCT564M 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 CD74HCT564M meets industry standards.
7.What is the process for return or replacement of CD74HCT564M?
All CD74HCT564M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT564M, 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 CD74HCT564M part is unused and in its original packaging.
Return procedure for CD74HCT564M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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