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Texas Instruments CD74HCT574EE4
- Part No.:
- CD74HCT574EE4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-DIP (0.300", 7.62mm)
- Datasheet:
-
CD74HCT574EE4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,000
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Product details
Overview
CD74HCT574EE4 from Texas Instruments is an octal D-type positive-edge-triggered flip-flop with 3-state outputs, designed for bus-oriented data latching in 5V digital systems. It features 4.5V–5.5V operation, 15ns typical clock-to-Q propagation delay at VCC = 5V/CL = 15pF, and drives up to 15 LSTTL loads. It is used in microprocessor data bus interfaces, address latching, and memory I/O control circuits.
For engineers reviewing the CD74HCT574EE4 datasheet, CD74HCT574EE4 pinout, CD74HCT574EE4 application, or CD74HCT574EE4 equivalent, key selection criteria include its LSTTL-compatible input thresholds (VIH ≥ 2V, VIL ≤ 0.8V), wide -55°C to +125°C operating temperature range, and 3-state output enable timing behavior under industrial bus loading conditions.
Technical Context
The CD74HCT574EE4 implements eight independent edge-triggered D flip-flops sharing a common clock (CP) and output enable (OE) control. Data is captured on the LOW-to-HIGH transition of CP, while OE independently places all Q outputs into high-impedance state when asserted HIGH.
Its HCT logic family ensures direct compatibility with standard TTL input levels and CMOS power efficiency. The device supports bus driving capability up to 15 LSTTL loads and exhibits balanced propagation delay and transition times across temperature extremes.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS power efficiency, 4.5V–5.5V supply |
| Clock-to-Q Delay | 15 ns typical at VCC = 5V, CL = 15pF - enables reliable 60 MHz bus operation with margin |
| Input Thresholds | VIH ≥ 2.0 V (min), VIL ≤ 0.8 V (max) - ensures robust interfacing with legacy TTL logic |
| Output Drive | 15 LSTTL loads - sufficient for driving multiple downstream ICs on shared data buses |
| Operating Temp | -55°C to +125°C - qualified for military, aerospace, and harsh industrial environments |
| Supply Current | ICC ≤ 160 µA (max, -55°C to +125°C) - low static power for battery-sensitive or thermally constrained designs |
| Three-State Leakage | ±10 µA (max, -55°C to +125°C) - ensures minimal bus contention during high-Z state |
Pinout & Package
CD74HCT574EE4 is supplied in a 20-pin plastic dual in-line package (PDIP), with 0.3-inch body width and standard through-hole mounting footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (OE) | Output Enable | Active-HIGH control: Q outputs enter high-impedance state when OE = HIGH |
| 2–9 (D0–D7) | Data Inputs | Asynchronous parallel data inputs latched on rising CP edge |
| 10 (GND) | Ground Reference | Signal and power return path for all internal logic and output drivers |
| 11–18 (Q0–Q7) | Tri-State Outputs | Registered outputs; driven only when OE = LOW, otherwise high-Z |
| 19 (CP) | Clock Input | Positive-edge-triggered latch control; data sampled at rising transition |
| 20 (VCC) | Power Supply | 4.5V–5.5V CMOS supply rail; decoupling required per high-speed digital layout practice |
Key Features
| Feature | Design Value |
|---|---|
| Direct LSTTL Input Compatibility | VIH ≥ 2.0 V / VIL ≤ 0.8 V eliminates need for level-shifting when interfacing with legacy TTL systems |
| Bus Line Driving Capability | 15 LSTTL load drive strength allows direct connection to multiple downstream devices without external buffers |
| Wide Temperature Range | -55°C to +125°C operation supports deployment in extended-environment applications including avionics and downhole instrumentation |
| Three-State Output Control | Common OE pin enables clean bus arbitration and prevents contention in multi-master or shared-bus architectures |
| Low Power Consumption | Quiescent ICC ≤ 160 µA over full temperature range reduces thermal load and extends system-level power budget |
Applications
| Microprocessor Data Bus Interface | Memory Address Latching |
|---|---|
|
Use Scenario: Interfacing an 8-bit microprocessor data bus to peripheral registers or memory-mapped I/O devices. IC Role / Device Role: Latches data from the bidirectional data bus during write cycles, isolating peripherals from bus activity during reads. Use Value: Enables synchronous, glitch-free data capture using the processor's WR signal as CP and address decode as OE, eliminating timing hazards. |
Use Scenario: Holding stable address signals for static RAM or ROM access in systems where address lines are multiplexed or time-shared. IC Role / Device Role: Captures and holds upper/lower address byte during memory access window, freeing CPU address pins for other functions. Use Value: Provides deterministic address hold timing with 15ns propagation delay, ensuring setup/hold compliance for >10 MHz memory subsystems. |
| Industrial PLC I/O Expansion | Test Equipment Digital Pattern Generation |
|
Use Scenario: Expanding digital input/output capacity in programmable logic controllers requiring ruggedized, wide-temperature components. IC Role / Device Role: Buffers and isolates field I/O signals from controller logic, with OE enabling dynamic reconfiguration of I/O direction. Use Value: -55°C to +125°C rating and 15 LSTTL drive support direct connection to optocouplers, relays, and discrete sensors without interface amplifiers. |
Use Scenario: Generating repeatable digital stimulus patterns for functional testing of ASICs, FPGAs, or board-level assemblies. IC Role / Device Role: Stores and outputs preloaded test vectors synchronized to a master clock, with OE allowing pattern gating or sequencing. Use Value: Precise 15ns clock-to-Q timing and low output skew ensure sub-20ns pattern edge alignment across all 8 bits for high-speed validation. |
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 | Identical pinout, same HCT logic family, but TI SN74 series uses different internal process and qualification flow; identical DC/AC specs at 5V. | Same bus-latching function; SN74HCT574N is catalog-grade with commercial temp range (-40°C to +85°C) vs. CD74HCT574EE4's extended -55°C to +125°C. | Select SN74HCT574N for cost-sensitive commercial designs where extended temperature is not required. |
| 74ACT574PC | Advanced CMOS (ACT) family: 4.5V–5.5V supply, faster 10ns typical tPLH, higher drive (24 mA), but higher ICC (4 mA typical). | Higher speed and drive support more demanding timing margins or heavier capacitive loads, but increased power and noise sensitivity. | Choose 74ACT574PC when >50 MHz bus operation or >20 pF trace capacitance requires lower propagation delay and stronger drive. |
Compared with SN74HCT574N, CD74HCT574EE4 offers guaranteed operation down to -55°C and up to +125°C - critical for defense and aerospace deployments - while 74ACT574PC delivers superior speed and current drive at the expense of higher static power and reduced noise immunity.
Availability
CD74HCT574EE4 is available at Aetrix Electronics and suitable for industrial control systems, avionics data acquisition modules, and downhole instrumentation requiring stable component supply across extreme temperature ranges and long production lifecycles.
Supply support for CD74HCT574EE4 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 50 years of high-reliability component development.
The CD74HCT574EE4 belongs to TI's CD74HCT logic family, engineered for robust interoperability between TTL and CMOS systems in mission-critical industrial and military applications.
FAQ
What is the maximum clock frequency supported by CD74HCT574EE4?
The CD74HCT574EE4 supports a maximum clock frequency of 20 MHz over its full operating temperature range (-55°C to +125°C) with CL = 50 pF. At 25°C and CL = 15 pF, it operates reliably up to 60 MHz. These values are specified in the switching characteristics table and verified under defined load and voltage conditions.
Does CD74HCT574EE4 require external pull-up resistors on its outputs?
No, CD74HCT574EE4 does not require external pull-up resistors on its outputs. Its three-state outputs actively drive HIGH or LOW when enabled (OE = LOW) and present high impedance (not floating) when disabled (OE = HIGH), eliminating bus contention without passive termination.
How does CD74HCT574EE4 differ from CD74HC574E?
CD74HCT574EE4 uses HCT logic with TTL-compatible inputs (VIH ≥ 2.0 V, VIL ≤ 0.8 V), while CD74HC574E uses HC logic with CMOS-compatible inputs (VIH ≥ 3.15 V at 4.5 V). This makes CD74HCT574EE4 directly compatible with legacy TTL systems without level shifters, unlike CD74HC574E.
Can CD74HCT574EE4 be used with a 3.3V microcontroller interface?
No, CD74HCT574EE4 is not recommended for direct 3.3V interface. Its minimum VIH is 2.0 V (at VCC = 5V), but 3.3V logic HIGH may fall below guaranteed recognition threshold under voltage tolerance and noise margins. A level translator or buffer is required for reliable operation.
What is the purpose of the common output enable (OE) pin on CD74HCT574EE4?
The OE pin on CD74HCT574EE4 provides centralized, asynchronous control of all eight Q outputs. When OE = HIGH, all outputs enter high-impedance state regardless of clock or data states - enabling safe bus sharing, multi-drop configurations, and dynamic I/O direction control in systems like microprocessor expansion buses.
CD74HCT574EE4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 20-DIP (0.300", 7.62mm)
- Packaging:
- Bulk
- Product Status:
- Active
- 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:
- Through Hole
- Supplier Device Package:
- 20-PDIP
CD74HCT574EE4 FAQ
1.How can I place an order for CD74HCT574EE4 through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT574EE4 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 CD74HCT574EE4 reliable?
The price and inventory of CD74HCT574EE4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT574EE4 is usually 5 days.
3.What payment methods are accepted for CD74HCT574EE4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT574EE4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT574EE4?
CD74HCT574EE4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT574EE4 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 CD74HCT574EE4?
For technical support, including CD74HCT574EE4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT574EE4 requirements.
6.How does Aetrix verify that CD74HCT574EE4 is sourced from the original manufacturer or authorized distributors?
All CD74HCT574EE4 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 CD74HCT574EE4 meets industry standards.
7.What is the process for return or replacement of CD74HCT574EE4?
All CD74HCT574EE4 units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT574EE4, 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 CD74HCT574EE4 part is unused and in its original packaging.
Return procedure for CD74HCT574EE4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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