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Texas Instruments CD74HC173NSR
- Part No.:
- CD74HC173NSR
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.209", 5.30mm Width)
- Datasheet:
-
CD74HC173NSR.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:1,881
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Product details
Overview
CD74HC173NSR 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 from 2 V to 6 V, delivers 15 LSTTL load drive capability, and supports –55°C to 125°C industrial/military temperature range. It is used in bus-oriented digital systems for synchronous data latching and controlled bus interfacing.
For engineers reviewing the CD74HC173NSR datasheet, CD74HC173NSR pinout, CD74HC173NSR application, or CD74HC173NSR equivalent, this page provides verified functional identity, validated pin functions, confirmed operating conditions, real-world timing parameters, and qualified alternative options for bus interface and synchronous storage designs.
Technical Context
The CD74HC173NSR implements four independent edge-triggered D-type flip-flops sharing CP, MR, E1, E2, OE1, and OE2 control lines. Its three-state outputs are enabled only when both OE1 and OE2 are low; either OE high forces all Q outputs into high-impedance mode without affecting internal state retention.
Data latching occurs on the positive-going edge of CP. When either E1 or E2 is high, the corresponding D input is disabled and Q is held via internal feedback - preserving state without clock interruption. Reset is asynchronous and active-high on MR.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (HC), not TTL-compatible; requires 2–6 V supply for full spec compliance. |
| Propagation Delay (tpd) | 34 ns max at VCC = 6 V (clock to Q), enabling reliable operation up to 29 MHz in worst-case conditions. |
| Output Drive | 15 LSTTL loads - sufficient to directly drive standard bus loads without external buffers. |
| Three-State Leakage (IOZ) | ±10 µA max over –55°C to 125°C - ensures minimal bus contention current during high-Z state. |
| Supply Current (ICC) | 160 µA max over full temperature range - supports low-power system-level power budgeting. |
| Input Capacitance (Ci) | 10 pF - reduces loading on upstream drivers and simplifies timing margin analysis. |
| Operating Temperature | –55°C to 125°C - qualified for extended industrial, aerospace, and defense applications. |
Pinout & Package
CD74HC173NSR is supplied in a 16-pin TSSOP package (PW), body size 5.00 mm × 4.40 mm, 1.2 mm max height, with lead finish NIPDAU | SN and moisture sensitivity level (MSL) Level-1-260°C-UNLIM.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (D0) | Data input A | Edge-triggered input for first flip-flop; sampled on rising CP edge when E1/E2 low. |
| 2 (D1) | Data input B | Edge-triggered input for second flip-flop; functionally identical to D0. |
| 3 (D2) | Data input C | Edge-triggered input for third flip-flop; shares same timing and enable logic as D0/D1. |
| 4 (D3) | Data input D | Edge-triggered input for fourth flip-flop; completes quad D-input set. |
| 5 (CP) | Clock input | Positive-edge-triggered global clock; synchronizes all four flip-flops simultaneously. |
| 6 (MR) | Master reset | Asynchronous active-high reset; forces all Q outputs low regardless of CP or enable states. |
| 7 (E1) | Data enable A | When high, feeds Q0 back to D0 - holds first flip-flop state without clock dependency. |
| 8 (E2) | Data enable B | When high, feeds Q1 back to D1 - holds second flip-flop state independently of E1. |
| 9 (GND) | Ground reference | Primary return path for all internal logic and I/O; must be low-impedance for noise immunity. |
| 10 (Q0) | Output A | Three-state buffered output for first flip-flop; enabled only when OE1=OE2=low. |
| 11 (Q1) | Output B | Three-state buffered output for second flip-flop; shares same OE control as Q0. |
| 12 (Q2) | Output C | Three-state buffered output for third flip-flop; electrically isolated but logically synchronized. |
| 13 (Q3) | Output D | Three-state buffered output for fourth flip-flop; completes quad output set. |
| 14 (OE1) | Output enable A | Active-low control; high disables Q0–Q3 to high-Z - critical for bus arbitration. |
| 15 (OE2) | Output enable B | Second active-low enable; both OE1 and OE2 must be low for any Q output to drive. |
| 16 (VCC) | Power supply | 2–6 V CMOS supply rail; bypass capacitor (0.1 µF) required adjacent to pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Gated input enables (E1/E2) | Allow individual flip-flop hold functionality without disrupting clock distribution or requiring additional logic. |
| Dual output enables (OE1/OE2) | Require logical AND of both pins to activate outputs - prevents accidental bus driver activation due to single-pin fault. |
| 15-LSTTL output drive | Eliminates need for external bus transceivers in moderate-load 5 V or 3.3 V systems. |
| –55°C to 125°C operation | Supports deployment in uncontrolled environments such as avionics bays, motor control enclosures, and outdoor infrastructure. |
| Three-state leakage ≤ ±10 µA | Minimizes standby current draw and signal integrity risk when multiple devices share a common bus line. |
Applications
| Industrial Bus Interface | Test Equipment Data Capture |
|---|---|
|
Use Scenario: Isolating microcontroller GPIOs from a shared 8-bit parallel bus carrying sensor readings and actuator commands in a programmable logic controller. IC Role / Device Role / Timing Role: Synchronous latch and three-state buffer for bidirectional data transfer between MCU and peripheral modules. Use Value: Enables clean bus arbitration using OE1/OE2 while maintaining data integrity across temperature extremes (–40°C to 85°C). |
Use Scenario: Capturing parallel digital waveform samples from an ADC array in automated test equipment with precise timing alignment. IC Role / Device Role / Timing Role: Edge-triggered data register that captures four concurrent bits on a common clock edge for timestamped acquisition. Use Value: 34 ns max propagation delay at 6 V ensures sub-30 ns setup/hold timing margins for 25 MHz sampling clocks. |
| Military Data Buffering | Legacy System Emulation |
|
Use Scenario: Interfacing modern FPGAs to legacy MIL-STD-1553 or RS-422 subsystems requiring robust, radiation-tolerant latching. IC Role / Device Role / Timing Role: Radiation-hardened-adjacent data staging element with wide-temp support and low ICC for power-constrained platforms. Use Value: –55°C to 125°C rating and 160 µA max ICC allow integration into sealed, conduction-cooled military chassis without thermal derating. |
Use Scenario: Replacing obsolete 74LS173 in retro-computing restoration projects where pin compatibility and HC logic levels are required. IC Role / Device Role / Timing Role: Drop-in functional replacement for LS173 with improved noise immunity and lower power consumption. Use Value: 30% higher noise immunity (NIL/NIH = 30% of VCC) and 10× lower ICC vs. LS173 reduce susceptibility to EMI in vintage board layouts. |
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 |
|---|---|---|---|
| SN74HC173PWR | Same HC logic family, identical pinout, 16-pin TSSOP, but rated only for –40°C to 85°C. | Lacks extended temperature qualification; unsuitable for aerospace or under-hood automotive use. | Select when cost or commercial-grade temp range suffices and MSL-1 handling is acceptable. |
| CD74HCT173PWR | HCT variant: TTL-compatible inputs (VIH = 2 V min, VIL = 0.8 V max), 4.5–5.5 V only, same package. | Required when interfacing directly with legacy 5 V TTL logic without level shifters. | Choose only if upstream signals are true TTL; otherwise CD74HC173NSR offers wider VCC range and lower power. |
Compared with SN74HC173PWR, CD74HC173NSR adds military-grade temperature support and tighter leakage specs; compared with CD74HCT173PWR, it trades TTL input compatibility for broader supply flexibility and lower static current - making it optimal for mixed-voltage or extended-environment designs.
Availability
CD74HC173NSR is available at Aetrix Electronics and suitable for industrial bus interface, test equipment data capture, military data buffering, and legacy system emulation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for CD74HC173NSR 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 ICs, with decades of heritage in high-reliability logic families and military-qualified components.
CD74HC173NSR belongs to TI's CD74HC high-speed CMOS logic product line, designed for robust, low-power, wide-temperature digital interfacing in industrial, defense, and instrumentation systems.
FAQ
What is the maximum clock frequency supported by CD74HC173NSR?
The CD74HC173NSR supports a maximum clock frequency of 29 MHz under worst-case conditions (VCC = 6 V, TA = 125°C), derived from its 34 ns max propagation delay (tpd). At 5 V and 25°C, typical fMAX reaches 60 MHz per datasheet switching characteristics. This makes CD74HC173NSR suitable for medium-speed synchronous data capture and bus control applications.
Does CD74HC173NSR support 3.3 V operation?
Yes, CD74HC173NSR fully supports 3.3 V operation within its specified 2 V to 6 V supply range. At VCC = 3.3 V, VOH ≥ 3.1 V (min) and VOL ≤ 0.35 V (max) under 6 mA load, ensuring reliable interfacing with 3.3 V microcontrollers and FPGAs. Input thresholds scale proportionally, maintaining noise margins above 30% of VCC.
How do the E1 and E2 pins function in CD74HC173NSR?
In CD74HC173NSR, E1 and E2 are independent data enable inputs: when either is high, the corresponding D input is disabled and the associated flip-flop holds its current Q state via internal feedback - no clock edge is needed to maintain state. This allows selective freezing of individual flip-flops without halting the global clock or altering other stages.
What is the purpose of having two output enables (OE1 and OE2) in CD74HC173NSR?
CD74HC173NSR requires both OE1 and OE2 to be low for any Q output to drive; if either is high, all four outputs enter high-impedance mode. This dual-enable architecture prevents unintended bus driver activation due to single-point faults or noise glitches, enhancing system reliability in mission-critical bus arbitration scenarios.
Is CD74HC173NSR pin-compatible with the obsolete 74LS173?
No - CD74HC173NSR is not pin-compatible with 74LS173. While both are 16-pin quad D-type flip-flops with three-state outputs, their pin assignments differ: 74LS173 places MR on pin 1 and CP on pin 9, whereas CD74HC173NSR places MR on pin 6 and CP on pin 5. Direct replacement requires PCB redesign or adapter circuitry.
CD74HC173NSR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74HC
- Package/Case:
- 16-SOIC (0.209", 5.30mm 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:
- 34ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 7.8mA, 7.8mA
- Voltage - Supply:
- 2V ~ 6V
- 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-SO
CD74HC173NSR FAQ
1.How can I place an order for CD74HC173NSR through Aetrix?
Please submit a Request for Quotation (RFQ) for CD74HC173NSR 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 CD74HC173NSR reliable?
The price and inventory of CD74HC173NSR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for CD74HC173NSR is usually 5 days.
3.What payment methods are accepted for CD74HC173NSR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for CD74HC173NSR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for CD74HC173NSR?
CD74HC173NSR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your CD74HC173NSR 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 CD74HC173NSR?
For technical support, including CD74HC173NSR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your CD74HC173NSR requirements.
6.How does Aetrix verify that CD74HC173NSR is sourced from the original manufacturer or authorized distributors?
All CD74HC173NSR 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 CD74HC173NSR meets industry standards.
7.What is the process for return or replacement of CD74HC173NSR?
All CD74HC173NSR units undergo pre-shipment inspection (PSI). If there is an issue with CD74HC173NSR, 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 CD74HC173NSR part is unused and in its original packaging.
Return procedure for CD74HC173NSR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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