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Texas Instruments CD74HCT374M
- Part No.:
- CD74HCT374M
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
CD74HCT374M.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:153
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Product details
Overview
CD74HCT374M from Texas Instruments is an octal D-type flip-flop with 3-state outputs, positive-edge clock triggering, and bus-driving capability. It operates at 4.5 V to 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 industrial data latching and microcontroller peripheral interfacing.
For engineers reviewing the CD74HCT374M datasheet, CD74HCT374M pinout, CD74HCT374M application, or CD74HCT374M equivalent, key selection criteria include its HCT-level TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), 20-pin SOIC package, 3-state output enable control, and guaranteed operation across extended temperature ranges without derating.
Technical Context
The CD74HCT374M implements eight independent edge-triggered D flip-flops synchronized to the rising edge of CP. Its output enable (OE) pin operates independently of clock and register state, placing all Q outputs into high-impedance when asserted high.
It features buffered inputs for noise immunity, CMOS-level power efficiency with TTL-compatible logic thresholds, and a functional truth table specifying hold time (5 ns), setup time (12–18 ns), and maximum clock frequency (60 MHz at CL = 15 pF).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V) ensure direct interface with legacy LSTTL systems. |
| Supply Voltage | 4.5 V to 5.5 V - matches standard 5 V digital rails; no level-shifting required in mixed-voltage systems. |
| Propagation Delay | 15 ns typ. (VCC = 5 V, CL = 15 pF) - enables reliable timing in 33–50 MHz synchronous bus applications. |
| Output Drive | 15 LSTTL loads - sufficient to drive multiple downstream logic gates or address/data bus segments without buffers. |
| Operating Temp | –55°C to +125°C - qualified for aerospace, automotive under-hood, and industrial control environments. |
| Max Clock Freq | 60 MHz (CL = 15 pF) - supports high-speed data capture in real-time I/O expansion and memory-mapped peripheral interfaces. |
Pinout & Package
CD74HCT374M uses a 20-pin SOIC (DW) package measuring 12.80 mm × 7.50 mm, with standard JEDEC outline and gull-wing leads compatible with automated SMT assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1–8 (D0–D7) | Data inputs | Asynchronous parallel data inputs latched on rising CP edge; require stable VIH/VIL levels before setup time. |
| 9 (GND) | Ground reference | Primary return path for all internal logic and output current; must be low-inductance connection. |
| 10 (Q0) | Output | 3-state output corresponding to D0; driven only when OE = LOW and after CP rising edge. |
| 11–17 (Q1–Q7) | Outputs | Octal 3-state outputs aligned with D1–D7; all enter high-Z simultaneously when OE = HIGH. |
| 18 (CP) | Clock input | Positive-edge-triggered master clock; requires monotonic rise/fall and meets tW ≥ 16 ns minimum pulse width. |
| 19 (OE) | Output enable | Active-low control (LOW = outputs enabled); asynchronous assertion overrides clock and latch state. |
| 20 (VCC) | Power supply | 5 V nominal supply; requires local 0.1 μF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Output Enable | Single OE pin controls all eight outputs simultaneously, enabling shared-bus arbitration without external logic. |
| TTL-Compatible Inputs | VIH ≥ 2 V and VIL ≤ 0.8 V allow direct connection to 5 V TTL outputs without level shifters or pull-ups. |
| Extended Temperature Range | –55°C to +125°C operation eliminates thermal derating in harsh environments like motor control or avionics. |
| Low Power Consumption | ICC ≤ 160 μA max (–55°C to +125°C) reduces system-level heat generation and improves power budget margin. |
| Bus Driving Capability | 15 LSTTL load drive strength supports direct connection to legacy bus structures without line drivers. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Parallel Interface |
|---|---|
Use Scenario: Latching sensor status or actuator commands in programmable logic controller backplanes with multiplexed data buses. IC Role / Device Role / Timing Role: Data register synchronizing asynchronous field signals to the PLC's deterministic scan cycle via rising-edge CP. Use Value: Enables deterministic sampling of 8-bit status words while isolating bus contention via 3-state OE control during read cycles. | Use Scenario: Expanding GPIO count on resource-constrained MCUs (e.g., MSP430, STM32) for driving LED arrays or segment displays. IC Role / Device Role / Timing Role: Parallel output latch buffering MCU port pins, releasing them for other functions while maintaining display state. Use Value: Eliminates software bit-banging overhead and ensures glitch-free static output using hardware edge-triggered storage. |
| Automotive Body Control Module | Test Equipment Digital Pattern Generator |
Use Scenario: Capturing switch inputs (door locks, window switches) in automotive body control units operating under wide ambient temperature swings. IC Role / Device Role / Timing Role: Input latch capturing mechanical switch bounce events on rising CP edge, with OE used for diagnostic isolation. Use Value: Guarantees reliable signal capture across –40°C to +105°C without external debouncing circuitry or timing margin loss. | Use Scenario: Generating repeatable 8-bit stimulus patterns for IC functional testing in ATE systems requiring precise timing alignment. IC Role / Device Role / Timing Role: Synchronized pattern register feeding test vectors to DUT inputs on each CP edge, with OE enabling pattern hold or bus release. Use Value: Provides sub-20 ns timing resolution and deterministic output transitions critical for setup/hold compliance verification. |
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 |
|---|---|---|---|
| SN74HCT374N | Same logic function and HCT specs; PDIP-20 package (25.4 mm × 6.35 mm), not SOIC. | Through-hole prototyping or legacy board repair where SOIC footprint is unavailable. | Select when manual soldering or socket-based development is required; same timing and drive strength. |
| CD74HCT574M | Identical electrical specs and package, but inverted pinout: OE active-HIGH instead of active-LOW; Q outputs assigned to different pins. | Systems requiring active-high output enable control or matching existing 574-based PCB layouts. | Use only if board layout accommodates pinout swap; functional behavior identical except OE polarity and pin mapping. |
Compared with SN74HCT374N and CD74HCT574M, the CD74HCT374M provides optimal drop-in compatibility for SOIC-based industrial designs requiring active-low OE and verified 125°C operation - whereas SN74HCT374N suits through-hole use, and CD74HCT574M demands layout revision due to pinout inversion.
Availability
CD74HCT374M is available at Aetrix Electronics and suitable for industrial automation, automotive body electronics, and test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HCT374M 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 logic, power management, and signal chain technologies.
The CD74HCT374M belongs to TI's legacy HCT logic family, designed specifically for robust 5 V system interfacing where TTL compatibility, extended temperature resilience, and bus-oriented 3-state control are mandatory.
FAQ
What is the maximum clock frequency supported by the CD74HCT374M?
The CD74HCT374M supports a maximum clock frequency of 60 MHz when loaded with CL = 15 pF, as specified in the switching characteristics table. At higher capacitive loads (e.g., CL = 50 pF), the maximum frequency drops to 20 MHz across the full –55°C to +125°C range. This performance enables use in high-speed digital control loops and synchronous data acquisition systems where precise edge-aligned sampling is required. The CD74HCT374M maintains this rating without derating up to its maximum operating temperature.
Does the CD74HCT374M require external pull-up or pull-down resistors on unused inputs?
Yes - all unused inputs of the CD74HCT374M must be tied to a defined logic level (VCC or GND) to prevent floating states that cause increased ICC, erratic output behavior, or ESD susceptibility. TI's layout guidelines explicitly prohibit leaving inputs unconnected. For example, if only four data lines (D0–D3) are used, D4–D7 should be connected to GND or VCC depending on desired default latch value. The CD74HCT374M does not include internal weak pull-ups or pull-downs.
How does the CD74HCT374M differ from the CD74HC374M in practical design?
The CD74HCT374M uses TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), allowing direct interface with legacy 5 V TTL outputs, while the CD74HC374M requires CMOS-level inputs (VIH ≥ 3.15 V at VCC = 4.5 V). This makes the CD74HCT374M suitable for mixed-technology systems with LSTTL peripherals, whereas the CD74HC374M is better suited for pure CMOS designs. Both share identical pinout, package, and 3-state output functionality.
Can the CD74HCT374M drive a 50 pF load reliably at 25°C?
Yes - the CD74HCT374M is fully characterized for CL = 50 pF operation at 25°C, with propagation delay tPLH/tPHL = 33–41 ns and output transition time tTHL/tTLH = 12–15 ns. Its output drive strength (±6 mA at VOL/VOL) ensures clean signal edges into 50 pF, including probe and trace capacitance. The CD74HCT374M maintains these parameters across temperature when operated within recommended VCC and loading conditions.
Is the CD74HCT374M pin-compatible with the SN74HCT374 series?
Yes - the CD74HCT374M (SOIC-20) shares identical pinout, electrical specifications, and functional behavior with the SN74HCT374 series in the same package variant (e.g., SN74HCT374D). Both follow the standard '374 logic diagram and truth table. However, SN74HCT374 variants in PDIP or TSSOP packages have different footprints and are not mechanically interchangeable with the CD74HCT374M's SOIC-20 body.
CD74HCT374M 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
CD74HCT374M FAQ
1.How can I place an order for CD74HCT374M through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT374M 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 CD74HCT374M reliable?
The price and inventory of CD74HCT374M are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT374M is usually 5 days.
3.What payment methods are accepted for CD74HCT374M?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT374M transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT374M?
CD74HCT374M orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT374M 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 CD74HCT374M?
For technical support, including CD74HCT374M datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT374M requirements.
6.How does Aetrix verify that CD74HCT374M is sourced from the original manufacturer or authorized distributors?
All CD74HCT374M 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 CD74HCT374M meets industry standards.
7.What is the process for return or replacement of CD74HCT374M?
All CD74HCT374M units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT374M, 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 CD74HCT374M part is unused and in its original packaging.
Return procedure for CD74HCT374M:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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