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Texas Instruments CD74HCT574ME4
- Part No.:
- CD74HCT574ME4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT574ME4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,449
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Product details
Overview
CD74HCT574ME4 from Texas Instruments is an octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and LSTTL-compatible inputs. It operates at 4.5–5.5 V, delivers 15 ns typical propagation delay (VCC = 5 V, CL = 15 pF), supports –55°C to +125°C operation, and drives up to 15 LSTTL loads - used in bus-oriented digital systems for data latching and isolation.
For engineers reviewing the CD74HCT574ME4 datasheet, CD74HCT574ME4 pinout, CD74HCT574ME4 application, or CD74HCT574ME4 equivalent, key selection criteria include its HCT logic family compatibility with TTL inputs, 3-state output enable control independent of clock, wide industrial temperature range, and SOIC-20 package suitability for high-density PCB layouts.
Technical Context
The CD74HCT574ME4 implements eight edge-triggered D flip-flops sharing a common output enable (OE) signal. Data is latched on the LOW-to-HIGH transition of the clock (CP), and OE controls high-impedance state independently - enabling bidirectional bus arbitration without affecting register state.
It belongs to the HCT logic family, ensuring direct interface with standard TTL inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V) while maintaining CMOS power efficiency. Its 3-state outputs exhibit 20 pF capacitance and support fast switching (fMAX = 60 MHz at CL = 15 pF), making it suitable for synchronous data capture in legacy and mixed-voltage systems.
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 connection to 5 V TTL without level shifters. |
| Supply Voltage | 4.5–5.5 V - matches standard 5 V system rails; excludes operation below 4.5 V to ensure guaranteed VIH/VIL margins. |
| Propagation Delay | 15 ns (typ.) at VCC = 5 V, CL = 15 pF - enables reliable timing in 60 MHz clock domains with adequate setup/hold margin. |
| Output Drive | 15 LSTTL loads - sufficient to drive multiple downstream TTL inputs on shared data buses without buffering. |
| Operating Temperature | –55°C to +125°C - qualified for extended industrial, automotive under-hood, and military-grade applications. |
| 3-State Enable | Active-low OE - high-impedance outputs when OE = HIGH, allowing safe bus sharing across multiple devices. |
| Input Leakage | ±1 μA max at VCC = 5.5 V - ensures minimal loading on driving sources and stable logic levels in high-impedance networks. |
Pinout & Package
CD74HCT574ME4 is packaged in a 20-pin SOIC (DW) with 12.80 mm × 7.50 mm body size, surface-mount compatible, and RoHS-compliant with NIPDAU lead finish.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CP) | Clock input | Positive-edge triggered - latches all eight D inputs simultaneously on rising edge; requires clean, monotonic transitions. |
| 2–9 (D0–D7) | Data inputs | Asynchronous inputs sampled only on CP rising edge; must meet tSU = 12 ns and tH = 5 ns relative to CP at VCC = 5 V. |
| 11–18 (Q0–Q7) | 3-state outputs | Driven low/high when OE = LOW; enter high-Z when OE = HIGH - enables time-multiplexed bus access. |
| 19 (OE) | Output enable | Active-low control - independent of clock; no effect on internal register state during assertion/deassertion. |
| 10 (GND) | Ground reference | Primary return path for all I/O and internal logic; requires low-inductance connection to minimize ground bounce. |
| 20 (VCC) | Power supply | 5 V nominal supply; bypassing with 0.1 µF ceramic capacitor near pin essential for noise immunity and switching stability. |
Key Features
| Feature | Design Value |
|---|---|
| 3-state output control | Independent OE pin allows dynamic bus contention avoidance without disrupting internal latch states. |
| LSTTL load drive capability | 15 LSTTL loads per output - eliminates need for external bus drivers in medium-complexity digital backplanes. |
| Wide temperature operation | –55°C to +125°C range supports deployment in harsh environments including industrial control cabinets and aerospace avionics. |
| TTL-compatible input thresholds | VIH ≥ 2.0 V / VIL ≤ 0.8 V at VCC = 5 V - ensures interoperability with legacy 5 V TTL logic families without interface circuitry. |
| Low power consumption | ICC ≤ 160 µA max over full temperature range - reduces thermal load and standby current in battery-backed or energy-sensitive systems. |
Applications
| Industrial PLC I/O Expansion | Automotive Body Control Module |
|---|---|
Use Scenario: Latching sensor status and actuator commands across isolated CAN or LIN subsystems. IC Role / Device Role / Timing Role: Octal D flip-flop capturing parallel digital signals from microcontroller GPIOs before serial transmission. Use Value: Enables deterministic sampling of 8-bit status words synchronized to system clock edges, preventing metastability in noisy vehicle electrical environments. |
Use Scenario: Isolating microcontroller GPIOs from high-current door lock, window lift, or lighting drivers. IC Role / Device Role / Timing Role: 3-state buffer/latch interfacing MCU outputs to discrete power switches or relay drivers. Use Value: Prevents bus contention during MCU reset or firmware update by placing outputs in high-Z state via OE control. |
| Test Equipment Digital Pattern Generator | Legacy Industrial Bus Interface |
Use Scenario: Generating precise, synchronized stimulus waveforms for functional testing of digital ASICs or FPGAs. IC Role / Device Role / Timing Role: Edge-triggered latch holding pattern data until clocked to output pins for DUT stimulation. Use Value: 15 ns propagation delay and 60 MHz max clock frequency support sub-20 ns timing resolution in automated test systems. |
Use Scenario: Interfacing modern microcontrollers to legacy 8-bit parallel buses (e.g., ISA, VME, or custom backplanes). IC Role / Device Role / Timing Role: Bidirectional bus transceiver replacement using 3-state outputs and TTL-compatible inputs. Use Value: Eliminates need for separate direction-control logic by enabling/disabling outputs synchronously with data transfer cycles. |
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 | Same HCT logic family, identical pinout, PDIP-20 package; slightly higher RθJA (84.6°C/W vs. 109.1°C/W for SOIC). | Preferred where through-hole assembly or manual prototyping is required; less suitable for high-density SMT layouts. | Select SN74HCT574N for breadboard evaluation or legacy through-hole production; CD74HCT574ME4 preferred for volume SMT manufacturing. |
| CD74HCT574PWR | TSSOP-20 package (6.50 mm × 4.40 mm); same electrical specs but lower thermal resistance (RθJA = 131.8°C/W) and tighter layout footprint. | Better suited for space-constrained portable or automotive ECUs where board area is critical. | Choose CD74HCT574PWR when PCB real estate is limited and reflow profile supports TSSOP; CD74HCT574ME4 offers better thermal performance in SOIC form factor. |
Compared with SN74HCT574N and CD74HCT574PWR, CD74HCT574ME4 provides optimal balance of thermal performance (RθJA = 109.1°C/W), industry-standard SOIC-20 footprint, and RoHS compliance - making it ideal for high-reliability industrial SMT production where long-term component availability and manufacturability are prioritized.
Availability
CD74HCT574ME4 is available at Aetrix Electronics and suitable for industrial control systems, automotive body electronics, automated test equipment, and legacy bus interface designs requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT574ME4 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 and embedded processing solutions, with over 90 years of innovation in high-reliability logic, power management, and signal chain technologies.
CD74HCT574ME4 belongs to TI's legacy HC/HCT logic portfolio designed for robust, pin-compatible replacements of obsolete TTL components in industrial, aerospace, and defense applications requiring wide temperature operation and proven reliability.
FAQ
What is the maximum clock frequency supported by CD74HCT574ME4?
The CD74HCT574ME4 supports a maximum clock frequency of 60 MHz when loaded with CL = 15 pF at VCC = 5 V. At CL = 50 pF, the maximum frequency drops to 20 MHz across the full –55°C to +125°C operating range. This specification is verified per TI's SCHS183E datasheet Section 5.5 and 5.6.
Does CD74HCT574ME4 support 3.3 V logic inputs?
No - CD74HCT574ME4 is an HCT-family device with TTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) optimized for 5 V operation. It does not guarantee recognition of 3.3 V logic-high signals, as 3.3 V may fall below the minimum VIH requirement. For 3.3 V systems, consider HC-family variants like CD74HC574M96 or level-shifting circuitry.
What is the purpose of the OE pin on CD74HCT574ME4?
The OE (output enable) pin on CD74HCT574ME4 is an active-low control that places all eight Q outputs into high-impedance state when asserted HIGH. It operates independently of the clock and internal register state, enabling safe bus sharing and dynamic output isolation without affecting stored data.
Can CD74HCT574ME4 be used in automotive applications?
Yes - CD74HCT574ME4 is rated for –55°C to +125°C operation and is listed in TI's qualified versions as the basis for the automotive-grade CD74HCT574-Q1. While CD74HCT574ME4 itself is a catalog part, its electrical and thermal specifications meet requirements for non-safety-critical automotive modules such as body control units and infotainment interfaces.
What package type is CD74HCT574ME4 supplied in?
CD74HCT574ME4 is supplied in a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with RoHS-compliant NIPDAU lead finish and moisture sensitivity level (MSL) rating of Level-1 at 260°C peak reflow. It is delivered in large tape-and-reel format (2000 units per reel).
CD74HCT574ME4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Function:
- Standard
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 33ns @ 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
CD74HCT574ME4 FAQ
1.How can I place an order for CD74HCT574ME4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574ME4 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 CD74HCT574ME4 reliable?
The price and inventory of CD74HCT574ME4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574ME4 is usually 5 days.
3.What payment methods are accepted for CD74HCT574ME4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574ME4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT574ME4?
CD74HCT574ME4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574ME4 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 CD74HCT574ME4?
For technical support, including CD74HCT574ME4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574ME4 requirements.
6.How does Aetrix verify that CD74HCT574ME4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT574ME4 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 CD74HCT574ME4 meets industry standards.
7.What is the process for return or replacement of CD74HCT574ME4?
All CD74HCT574ME4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574ME4, 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 CD74HCT574ME4 part is unused and in its original packaging.
Return procedure for CD74HCT574ME4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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