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Texas Instruments CD74HCT173MT
- Part No.:
- CD74HCT173MT
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
CD74HCT173MT.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,050
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Product details
Overview
CD74HCT173MT from Texas Instruments is a high-speed CMOS quad D-type flip-flop with three-state outputs, shared clock (CP), master reset (MR), and dual data enable (E1/E2) and output enable (OE1/OE2) controls. It operates at 4.5 V to 5.5 V, delivers 60 MHz max clock frequency at 5 V, supports –55°C to +125°C industrial/military temperature range, and drives up to 15 LSTTL loads - used in synchronous bus interface and data latching applications.
For engineers reviewing the CD74HCT173MT datasheet, CD74HCT173MT pinout, CD74HCT173MT application, or CD74HCT173MT equivalent, key selection criteria include its LSTTL-compatible input thresholds (VIL ≤ 0.8 V, VIH ≥ 2.0 V), three-state propagation delay (14 ns typ @ 4.5 V), guaranteed operation across extended temperature, and SOIC-16 package compatibility with standard PCB assembly processes.
Technical Context
The CD74HCT173MT implements four edge-triggered D-type flip-flops sharing CP, MR, E1/E2, and OE1/OE2 control lines. Its synchronous positive-edge clocking and asynchronous active-high master reset enable deterministic state capture and global initialization in bus-oriented digital systems.
Three-state output buffering is controlled independently by OE1 and OE2: either high disables all Q outputs to high-impedance, while E1/E2 gating allows data hold without clock interruption. Input logic levels are fully compatible with standard LS-TTL, eliminating level-shifting requirements in mixed-logic designs.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - ensures direct drop-in replacement for 5 V TTL systems without regulator redesign. |
| Max Clock Frequency | 60 MHz at VCC = 5 V - supports high-throughput data sampling and pipeline staging in real-time control logic. |
| Propagation Delay (CP→Q) | 17 ns typical at 4.5 V - enables tight timing margins in synchronous state machines with multi-stage register chains. |
| Input Thresholds | VIL ≤ 0.8 V, VIH ≥ 2.0 V - guarantees reliable interfacing with legacy 74LS-series outputs without external pull-ups or translators. |
| Output Drive | 15 LSTTL loads - sufficient to drive full 8-bit or 16-bit data buses without fanout buffers. |
| Operating Temperature | –55°C to +125°C - qualified for aerospace, defense, and under-hood automotive environments per MIL-PRF-38535. |
| Three-State Leakage | ±0.5 µA max at 5.5 V - minimizes bus contention current and signal integrity degradation during high-Z states. |
Pinout & Package
CD74HCT173MT is supplied in a 16-pin SOIC (D) package with 9.90 mm × 3.90 mm body size, 1.27 mm lead pitch, and gull-wing surface-mount terminals compatible with IPC-7351B SOIC16_STD land pattern.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (MR) | Master Reset | Asynchronous active-high reset forcing all Q outputs low regardless of clock or enable state. |
| 2–5 (D0–D3) | Data Inputs | Independent parallel data inputs synchronized to rising CP edge when E1=E2=L. |
| 6 (E1) | Data Enable 1 | When high, feeds Qn back to Dn - holds current state without clock activity. |
| 7 (E2) | Data Enable 2 | Second independent data enable; E1 OR E2 high forces hold mode. |
| 8 (GND) | Ground | Reference return path for all internal logic and I/O circuits. |
| 9–12 (Q0–Q3) | Three-State Outputs | Registered outputs disabled to high-Z when OE1 or OE2 = H; otherwise reflect Dn after CP↑. |
| 13 (OE1) | Output Enable 1 | Active-high control for three-state output buffer; OE1=H disables Q0–Q3. |
| 14 (OE2) | Output Enable 2 | Redundant output enable for fault-tolerant bus arbitration or dual-bus isolation. |
| 15 (CP) | Clock Input | Positive-edge-triggered master clock synchronizing all four flip-flops simultaneously. |
| 16 (VCC) | Power Supply | 4.5–5.5 V supply rail; requires local 0.1 µF ceramic bypass capacitor per device. |
Key Features
| Feature | Design Value |
|---|---|
| LSTTL-Compatible Inputs | VIH ≥ 2.0 V and VIL ≤ 0.8 V at VCC = 4.5–5.5 V - eliminates need for level shifters when interfacing with 74LS/ALS families. |
| Dual Output Enables (OE1/OE2) | Independent high-impedance control per output group - enables flexible bus arbitration and hot-swap-safe data isolation. |
| Dual Data Enables (E1/E2) | Hold-mode capability without clock interruption - preserves register state during clock gating or power management sequences. |
| Extended Temperature Range | –55°C to +125°C operation - meets MIL-STD-883 Class B screening requirements for high-reliability embedded systems. |
| Low Dynamic Power | 34 pF power dissipation capacitance (Cpd) - reduces switching current and thermal load in high-frequency clock domains. |
Applications
| Industrial Bus Interface | Avionics Data Acquisition |
|---|---|
|
Use Scenario: Isolating sensor data streams onto a shared 16-bit MIL-STD-1553B or ARINC 429 backplane bus. IC Role / Device Role / Timing Role: Synchronizes analog-to-digital converter outputs and gates them onto the bus using OE1/OE2 under microcontroller arbitration. Use Value: Three-state outputs prevent bus contention; LSTTL compatibility ensures seamless integration with legacy flight computer I/O modules. |
Use Scenario: Capturing discrete status signals (e.g., landing gear position, flap angle) in real time for FDR (Flight Data Recorder). IC Role / Device Role / Timing Role: Quad D-flip-flop latches parallel status bits on rising edge of a 10 MHz system clock, with MR enabling synchronized reset during power-up. Use Value: –55°C to +125°C rating ensures reliability in unpressurized avionics bays; low ICC (≤160 µA) extends battery-backed recording duration. |
| Test Equipment Pattern Generator | Military Radio Control Logic |
|
Use Scenario: Generating precise, repeatable stimulus waveforms for IC functional testing in ATE platforms. IC Role / Device Role / Timing Role: Stores and clocks out 4-bit test vectors under pattern sequencer control; E1/E2 enables vector hold during debug breakpoints. Use Value: 17 ns CP→Q delay supports >50 MHz pattern rates; 15-LSTTL drive strength directly drives multiple DUT input pins without buffering. |
Use Scenario: Managing channel select, encryption key loading, and mode configuration in software-defined radios (SDR) operating in harsh EM environments. IC Role / Device Role / Timing Role: Holds secure configuration bits across power cycles and provides glitch-free updates via synchronized CP and MR. Use Value: High noise immunity (NIL/NIH = 30% of VCC) prevents spurious state changes from RF coupling; SOIC-16 package supports conformal coating for moisture resistance. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar quad D-type flip-flop with three-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HCT173N | Same logic function, pinout, and DC specs; PDIP-16 package only (no SOIC option); higher RθJA (67°C/W vs. 73°C/W for SOIC). | Preferred for through-hole prototyping or legacy board rework where SOIC footprint is unavailable. | Select SN74HCT173N when manual soldering or socket-based validation is required; not suitable for automated SMT production. |
| CD74HC173M96 | HC variant: 2–6 V supply range, VIH/VIL referenced to VCC (not fixed TTL thresholds); lower drive (10 LSTTL loads) and slower speed (40 ns max tpd @ 6 V). | Used in mixed-voltage systems (e.g., 3.3 V logic with 5 V peripherals) where LSTTL compatibility is not required. | Choose CD74HC173M96 only if supply voltage flexibility outweighs need for guaranteed 5 V TTL interoperability. |
Compared with SN74HCT173N and CD74HC173M96, CD74HCT173MT uniquely combines LSTTL input compatibility, SOIC-16 surface-mount packaging, and extended temperature support - making it the optimal choice for high-reliability, volume-manufactured 5 V bus interface designs.
Availability
CD74HCT173MT is available at Aetrix Electronics and suitable for industrial bus interface, avionics data acquisition, and military radio control applications requiring stable component supply across long product lifecycles.
Supply support for CD74HCT173MT 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 innovation in high-reliability logic ICs.
CD74HCT173MT belongs to TI's CDx4HCT logic family, engineered for drop-in replacement of legacy 74LS devices in mission-critical systems demanding extended temperature operation and robust noise immunity.
FAQ
What is the maximum clock frequency supported by CD74HCT173MT?
The CD74HCT173MT supports a maximum clock frequency of 60 MHz at VCC = 5 V and TA = 25°C, with derated performance down to 13 MHz at –55°C to +125°C extremes. This specification is validated per TI's SCHS158F datasheet Section 5.5, ensuring reliable operation in high-speed synchronous logic designs without setup/hold violations.
Does CD74HCT173MT require external pull-up resistors on its inputs?
No, CD74HCT173MT does not require external pull-up resistors on its inputs because its LSTTL-compatible input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V) are designed to interface directly with standard 74LS outputs. Unused inputs must still be tied to VCC or GND per Section 9.1 of the datasheet to prevent floating states and undefined operation.
Can CD74HCT173MT operate at 3.3 V supply voltage?
No, CD74HCT173MT is specified only for 4.5 V to 5.5 V operation per Section 5.2 of the datasheet. Attempting 3.3 V operation violates recommended conditions and risks unreliable logic thresholds, increased propagation delay, and potential failure to meet VIH/VIL specifications - use CD74HC173M96 instead for 2–6 V flexibility.
How does the dual output enable (OE1/OE2) function in CD74HCT173MT?
In CD74HCT173MT, either OE1 or OE2 asserted high places all Q0–Q3 outputs into high-impedance state, enabling independent bus arbitration. Both OE1 and OE2 must be low to enable normal output driving. This redundancy supports fault-tolerant designs where one enable line can serve as backup or for segmented bus control.
Is CD74HCT173MT pin-compatible with the 74LS173?
Yes, CD74HCT173MT is functionally and pin-compatible with the 74LS173, sharing identical pin assignments, truth table behavior, and 16-pin DIP/SOIC footprints. Its HCT logic family ensures direct substitution while delivering CMOS-level power efficiency and extended temperature range beyond the original bipolar LS device.
CD74HCT173MT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Tri-State, Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 4
- Clock Frequency:
- 60 MHz
- Max Propagation Delay @ V, Max CL:
- 40ns @ 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:
- 16-SOIC
CD74HCT173MT FAQ
1.How can I place an order for CD74HCT173MT through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HCT173MT 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 CD74HCT173MT reliable?
The price and inventory of CD74HCT173MT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HCT173MT is usually 5 days.
3.What payment methods are accepted for CD74HCT173MT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HCT173MT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HCT173MT?
CD74HCT173MT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HCT173MT 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 CD74HCT173MT?
For technical support, including CD74HCT173MT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HCT173MT requirements.
6.How does Aetrix verify that CD74HCT173MT is sourced from the original manufacturer or authorized distributors?
All CD74HCT173MT 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 CD74HCT173MT meets industry standards.
7.What is the process for return or replacement of CD74HCT173MT?
All CD74HCT173MT units undergo pre-shipment inspection (PSI). If there is an issue with CD74HCT173MT, 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 CD74HCT173MT part is unused and in its original packaging.
Return procedure for CD74HCT173MT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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