My Inquiry
My Account
Texas Instruments CD54HCT74F
- Part No.:
- CD54HCT74F
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 14-CDIP (0.300", 7.62mm)
- Datasheet:
-
CD54HCT74F.pdf
- Description:
- HIGH SPEED CMOS LOGIC DUAL POSIT
- Quantity:
- Payment:
- Shipping:
Inventory:2,326
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
CD54HCT74F from Texas Instruments is a dual D-type positive-edge-triggered flip-flop with independent asynchronous preset and clear inputs per channel, operating across 2 V to 6 V supply voltage and –55°C to +125°C temperature range. It delivers 35 MHz maximum clock frequency at 6 V, supports up to 10 LSTTL loads, and is used in high-reliability toggle-switch conversion and clock-division circuits.
For engineers reviewing the CD54HCT74F datasheet, CD54HCT74F pinout, CD54HCT74F application, or CD54HCT74F equivalent, key selection criteria include its military-grade CDIP (J) package, guaranteed operation over full military temperature range, dual-channel edge-triggered storage behavior, and compatibility with TTL-level input thresholds under HCT logic family specifications.
Technical Context
The CD54HCT74F implements two independent D-type latches synchronized to the rising edge of CLK, each with active-low asynchronous PRE and CLR inputs that override clocked data capture. Its HCT logic family ensures TTL-compatible input thresholds (VIH = 2.0 V min, VIL = 0.8 V max at VCC = 5 V) while maintaining CMOS power efficiency.
Each channel provides complementary Q and Q̅ outputs with balanced push-pull drive capability, enabling direct interfacing to LSTTL loads without external level-shifting. Propagation delay is specified at 30 ns (max) for CP→Q at VCC = 6 V and TA = –55°C to +125°C, with setup time as low as 10 ns and hold time fixed at 3 ns.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | HCT - TTL-compatible inputs, CMOS outputs, enabling direct replacement of 74LS74 in legacy systems |
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system integration and battery-backed operation down to 2 V |
| Operating Temperature | –55°C to +125°C - qualified for military, aerospace, and extended-temperature industrial applications |
| Max Clock Frequency | 35 MHz at 6 V - enables reliable 2× and 4× clock division in timing-critical subsystems |
| Propagation Delay (tpd) | 30 ns max (CP→Q, VCC = 6 V, TA = –55°C to +125°C) - defines minimum clock period and setup margin |
| Input Thresholds | VIH = 2.0 V min, VIL = 0.8 V max (VCC = 5 V) - ensures robust noise immunity when driven by standard TTL sources |
| Output Drive | ±4 mA (VOH/VOL @ VCC = 4.5 V) - sufficient to directly drive 10 LSTTL loads without buffering |
Pinout & Package
CD54HCT74F uses a hermetically sealed 14-pin Ceramic Dual In-line Package (CDIP or J package), measuring 21.30 mm × 7.60 mm, rated for high-reliability military applications with SNPB (tin-lead) lead finish and no MSL restriction.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 13 | Channel 1 & 2 Clear (Active Low) | Asynchronous reset: forces Q = 0, Q̅ = 1 regardless of clock or data state |
| 2, 12 | Channel 1 & 2 Data Input | Stores logic level on next rising clock edge; determines next Q output state |
| 3, 11 | Channel 1 & 2 Clock Input | Positive-edge-triggered sampling point; all synchronous operations occur at rising transition |
| 4, 10 | Channel 1 & 2 Preset (Active Low) | Asynchronous set: forces Q = 1, Q̅ = 0 independently of clock or data |
| 5, 9 | Channel 1 & 2 True Output | Primary registered output; toggles on each valid clock edge when D = Q̅ (toggle mode) |
| 6, 8 | Channel 1 & 2 Complementary Output | Inverted output; enables direct feedback to D input for toggle configuration without external inversion |
| 7 | Ground (GND) | Reference return path for all inputs, outputs, and internal circuitry |
| 14 | Positive Supply (VCC) | Power rail for logic core and output drivers; must be decoupled with 0.1 µF capacitor near pin |
Key Features
| Feature | Design Value |
|---|---|
| Buffered Inputs | Reduces capacitive loading on driving source and improves noise rejection across wide temperature range |
| TTL-Compatible Input Thresholds | Enables direct interface with legacy 74LS and 74F logic families without level shifters or resistive biasing |
| Asynchronous Set/Reset per Channel | Allows independent initialization or forced state recovery without waiting for clock edge or disrupting other channel |
| Low Power Consumption | ICC ≤ 80 µA max at 6 V - reduces thermal load and extends battery life in portable military electronics |
| High Fanout Capability | Drives up to 10 LSTTL loads - minimizes need for buffer stages in dense logic designs |
Applications
| Toggle Switch Emulation | Clock Division |
|---|---|
Use Scenario: Replacing mechanical toggle switches in space-constrained avionics panels using momentary push-button inputs. IC Role / Device Role / Timing Role: D-type flip-flop configured in toggle mode (D tied to Q̅), clocked by debounced switch signal to generate stable, bounce-free output transitions. Use Value: Eliminates mechanical wear, reduces PCB footprint by >70%, and enables remote actuation via low-current control lines. | Use Scenario: Generating precise 50% duty-cycle sub-clocks from a master oscillator in radar pulse timing generators. IC Role / Device Role / Timing Role: First-stage divider (÷2) feeding subsequent CD54HCT74F stages to achieve ÷4 or cascaded division ratios. Use Value: Maintains edge alignment and jitter performance within ±3 ns over –55°C to +125°C, critical for coherent RF signal synthesis. |
| State Machine Control | Safety Interlock Sequencing |
Use Scenario: Implementing two-bit synchronous state registers in radiation-tolerant spacecraft telemetry controllers. IC Role / Device Role / Timing Role: Edge-triggered storage element holding current operational mode; PRE/CLR pins used for safe power-up initialization and fault-induced reset. Use Value: Guarantees known startup state and deterministic recovery from single-event upsets via asynchronous control inputs. | Use Scenario: Enforcing sequential enable conditions in nuclear instrumentation interlock chains requiring fail-safe hardware gating. IC Role / Device Role / Timing Role: Dual-channel latch enforcing AND-logic between sensor readiness and operator confirmation before enabling high-power subsystems. Use Value: Prevents hazardous activation during transient faults; hermetic CDIP package ensures long-term reliability in high-humidity containment environments. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD74HC74E | HC logic family: CMOS input thresholds (VIH = 3.15 V min at 4.5 V), not TTL-compatible; plastic PDIP package | Restricted to commercial/military-extended temp (–55°C to +125°C same, but not qualified to MIL-PRF-38535) | Select when cost-sensitive non-military designs require lower static power and accept TTL-to-CMOS level translation |
| SN54LS74AJ | LS-TTL family: higher ICC (19 mA typical), narrower VCC range (4.75–5.25 V), faster tpd (15 ns typ) but higher power | Compatible only with 5 V TTL systems; lacks wide-VCC and extended-temp support | Select only for legacy 5 V TTL backplanes where LS speed is mandatory and power dissipation is secondary |
Compared with CD74HC74E, CD54HCT74F offers guaranteed TTL input compatibility and hermetic packaging for harsh environments; compared with SN54LS74AJ, it reduces supply current by >99% while retaining identical pinout and toggle functionality - making it the preferred upgrade for power- and reliability-critical deployments.
Availability
CD54HCT74F is available at Aetrix Electronics and suitable for avionics control units, radar timing subsystems, and nuclear instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD54HCT74F 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.
The CD54HCT74F belongs to TI's military-grade HCT logic family, designed specifically for drop-in replacement of legacy 74LS devices in defense, aerospace, and industrial systems demanding extended temperature operation and hermetic packaging integrity.
FAQ
What is the maximum clock frequency supported by CD54HCT74F across its full temperature range?
The CD54HCT74F supports a maximum clock frequency of 35 MHz at VCC = 6 V and TA = –55°C to +125°C, dropping to 23 MHz at the same voltage under worst-case temperature extremes. This rating is verified per TI's SCHS124E datasheet Section 6.5 and applies to both channels independently when operated within recommended conditions.
Does CD54HCT74F require external pull-up or pull-down resistors on unused inputs?
No - CD54HCT74F does not require external resistors on unused inputs because its HCT inputs have built-in TTL-compatible threshold circuitry that prevents floating states. However, TI recommends tying unused inputs directly to VCC or GND to eliminate noise susceptibility and ensure deterministic logic behavior in high-noise military environments.
Can CD54HCT74F be used as a direct replacement for SN54LS74AJ in existing PCB layouts?
Yes - CD54HCT74F shares identical pinout, DC electrical characteristics, and functional behavior with SN54LS74AJ, including active-low preset/clear and positive-edge triggering. Its TTL-compatible inputs and CDIP (J) package allow drop-in replacement without layout changes, though designers should verify timing margins due to slightly longer propagation delay (30 ns vs. 15 ns typical).
What is the significance of the "F" suffix in CD54HCT74F?
The "F" suffix in CD54HCT74F denotes the Ceramic Dual In-line Package (CDIP) variant per TI's packaging nomenclature. It identifies the hermetically sealed, military-qualified 14-pin ceramic package with SNPB lead finish, distinguishing it from plastic PDIP ("E") and SOIC ("M") variants in the same logic family.
How does CD54HCT74F handle power supply decoupling requirements?
CD54HCT74F requires a 0.1 µF ceramic capacitor placed physically adjacent to the VCC pin (Pin 14) and GND pin (Pin 7) to suppress high-frequency switching noise. TI specifies this in Section 10 of the SCHS124E datasheet; failure to implement proper decoupling may cause metastability or output glitches, especially under fast clock edges or heavy capacitive loading.
CD54HCT74F Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 54HCT
- Package/Case:
- 14-CDIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Set(Preset) and Reset
- Type:
- D-Type
- Output Type:
- Complementary
- Number of Elements:
- 2
- Number of Bits per Element:
- 1
- Clock Frequency:
- 25 MHz
- Max Propagation Delay @ V, Max CL:
- 40ns @ 4.5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 4mA, 4mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 10 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 14-CDIP
CD54HCT74F FAQ
1.How can I place an order for CD54HCT74F through Aetrix?
Please submit a Request for Quotation (RFQ) for CD54HCT74F 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 CD54HCT74F reliable?
The price and inventory of CD54HCT74F are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD54HCT74F is usually 5 days.
3.What payment methods are accepted for CD54HCT74F?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD54HCT74F transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD54HCT74F?
CD54HCT74F orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD54HCT74F 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 CD54HCT74F?
For technical support, including CD54HCT74F datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD54HCT74F requirements.
6.How does Aetrix verify that CD54HCT74F is sourced from the original manufacturer or authorized distributors?
All CD54HCT74F 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 CD54HCT74F meets industry standards.
7.What is the process for return or replacement of CD54HCT74F?
All CD54HCT74F units undergo pre-shipment inspection (PSI). If there is an issue with CD54HCT74F, 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 CD54HCT74F part is unused and in its original packaging.
Return procedure for CD54HCT74F:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
CD54HCT74F Tags
-
SN74HC74DR
Texas Instruments
-
SN74HC74PWR
Texas Instruments
-
74LVC1G74GT,115
Nexperia USA Inc.
-
SN74LVC2G74DCUR
Texas Instruments
-
CD4013BM96
Texas Instruments
-
SN74HCT273PWR
Texas Instruments
-
SN74LVC1G74DCUR
Texas Instruments
-
SN74HC574DWR
Texas Instruments
-
74LVC1G74DC,125
Nexperia USA Inc.
-
SN74HC273DWR
Texas Instruments
-
SN74HCT574DWR
Texas Instruments
-
SN74LVC1G74DCTR
Texas Instruments
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
