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Texas Instruments SN74LS173ADRG4
- Part No.:
- SN74LS173ADRG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
SN74LS173ADRG4.pdf
- Description:
- IC FF D-TYPE SNGL 4BIT 16SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,230
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Product details
Overview
SN74LS173ADRG4 from Texas Instruments is a 4-bit D-type register with 3-state outputs, designed for bus-oriented TTL systems. It features independent clock and gated data-enable (G1/G2) and output-control (M/N) inputs, 18 ns typical propagation delay, 50 MHz maximum clock frequency, and operates from 4.75 V to 5.25 V at 0°C to 70°C. It serves as a bus buffer register in legacy industrial control and data acquisition systems.
For engineers reviewing the SN74LS173ADRG4 datasheet, SN74LS173ADRG4 pinout, SN74LS173ADRG4 application, or SN74LS173ADRG4 equivalent, key selection considerations include its 3-state bus interface capability, parallel-load timing behavior, TTL-compatible input thresholds (VIH = 2 V, VIL = 0.8 V), and SOIC-16 packaging for space-constrained PCB layouts.
Technical Context
The SN74LS173ADRG4 implements four edge-triggered D-type flip-flops with fully independent clocking, enabling synchronous parallel load or hold operation without inter-stage restrictions. Its dual output-control inputs (M and N) allow simultaneous high-impedance disable of all four outputs, independent of clock state.
It uses low-power Schottky (LS) TTL logic, delivering 12 mA low-level and –2.6 mA high-level output drive into standard TTL loads, with off-state leakage ≤ ±20 µA. The device supports up to 128 outputs on a shared bus while maintaining valid Series 74LS loading compliance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74LS TTL - ensures compatibility with legacy 5 V TTL systems and predictable noise margins |
| Propagation Delay (tPLH/tPHL) | 17–30 ns - enables reliable operation up to 50 MHz clock rate in synchronous bus interfaces |
| Output Drive Capability | IOL = 12 mA / IOH = –2.6 mA - sufficient to drive two 74LS loads directly without external buffers |
| 3-State Disable Time | tPHZ/tPLZ = 11–20 ns - faster disable than enable minimizes bus contention risk during output switching |
| Supply Voltage Range | 4.75 V to 5.25 V - tight tolerance aligns with regulated 5 V power rails in industrial backplanes |
| Operating Temperature | 0°C to 70°C - qualified for commercial-grade embedded control and instrumentation applications |
| Input Thresholds | VIH = 2.0 V, VIL = 0.8 V - matches standard TTL logic levels for seamless integration with 74-series components |
Pinout & Package
SN74LS173ADRG4 is housed in a 16-pin SOIC (D) package with 1.27 mm pitch, 10.3 mm × 5.3 mm body, and gull-wing leads suitable for surface-mount reflow assembly.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (M) | Output Control A | Active-low enable for 3-state outputs; high forces all Q outputs into high-impedance |
| 2 (N) | Output Control B | Second active-low output control; both M and N must be low for normal Q output states |
| 3 (1Q) | Output A | 3-state totem-pole output for bit 0; driven by corresponding D input on CLK↑ when enabled |
| 4 (2Q) | Output B | 3-state totem-pole output for bit 1; electrically identical to 1Q with independent D/CLK path |
| 5 (3Q) | Output C | 3-state totem-pole output for bit 2; shares same output-control logic as 1Q and 2Q |
| 6 (4Q) | Output D | 3-state totem-pole output for bit 3; completes 4-bit parallel output group |
| 7 (CLK) | Clock Input | Positive-edge-triggered master clock; controls synchronous loading of all four D inputs |
| 8 (GND) | Ground Reference | Power return for logic and output stages; requires low-impedance connection to minimize noise coupling |
| 9 (VCC) | Supply Voltage | +5 V DC supply; decoupling capacitor (0.1 µF) recommended adjacent to pin for transient suppression |
| 10 (CLR) | Asynchronous Clear | Active-high reset that forces all Q outputs low regardless of CLK or enable state |
| 11 (1D) | Data Input A | Primary D input for flip-flop driving 1Q; sampled on CLK↑ only when G1=G2=L |
| 12 (2D) | Data Input B | Primary D input for flip-flop driving 2Q; functionally isolated from other D inputs |
| 13 (3D) | Data Input C | Primary D input for flip-flop driving 3Q; no internal sharing with other data paths |
| 14 (4D) | Data Input D | Primary D input for flip-flop driving 4Q; completes 4-bit parallel data input port |
| 15 (G2) | Data Enable B | Second gated input for data loading; both G1 and G2 must be low to capture D inputs on CLK↑ |
| 16 (G1) | Data Enable A | First gated input for data loading; works conjunctively with G2 to qualify clocked load operation |
Key Features
| Feature | Design Value |
|---|---|
| 3-State Bus Interface | Direct connection to shared data buses without pull-ups or interface logic; supports up to 128 outputs per bus |
| Gated Data Enable (G1/G2) | Prevents unintended register updates by requiring both enables low before sampling D inputs on clock edge |
| Independent Output Control (M/N) | Enables/disables all outputs simultaneously without affecting internal flip-flop states or clock operation |
| Asynchronous Active-High CLR | Resets all Q outputs to logic low immediately, independent of clock or enable signals |
| Low-Power Schottky (LS) Design | Reduces ICC to 19–24 mA typical - cuts power consumption vs. standard 74173 while retaining TTL compatibility |
Applications
| Industrial Backplane Bus Buffer | Legacy Test Equipment Data Latch |
|---|---|
Use Scenario: Isolating and latching address/data signals between CPU and peripheral modules in modular PLC racks. IC Role / Device Role / Timing Role: Acts as a 4-bit bidirectional bus latch with controlled output enable, synchronizing data transfers across asynchronous subsystems. Use Value: Eliminates need for discrete buffer ICs and pull-up resistors, reducing component count and layout complexity on dense backplane cards. |
Use Scenario: Capturing 4-bit status flags from analog front-end circuits in automated calibration testers. IC Role / Device Role / Timing Role: Provides edge-triggered storage of diagnostic bits synchronized to system test clock, with outputs disabled during measurement phases. Use Value: Enables precise timing alignment of flag capture and prevents bus contention during concurrent signal acquisition cycles. |
| Microcontroller I/O Expansion Interface | TTL-Based Digital Logic Trainer |
Use Scenario: Extending GPIO capability of 8-bit microcontrollers in educational lab equipment where native pins are insufficient. IC Role / Device Role / Timing Role: Functions as a parallel-output expander, accepting serially shifted data via software-controlled G1/G2/CLK sequencing. Use Value: Allows reuse of existing 5 V TTL infrastructure without level-shifting, preserving signal integrity and simplifying firmware timing. |
Use Scenario: Demonstrating synchronous sequential logic concepts including register loading, clearing, and bus sharing in electronics labs. IC Role / Device Role / Timing Role: Serves as a hands-on 4-bit storage element with visible 3-state control, illustrating bus arbitration and clock-domain isolation. Use Value: Provides tactile, observable behavior (LED-driven outputs) with real-world timing constraints (setup/hold, enable/disable delays). |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-bit D-type register with 3-state output applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74LS173AN | Same logic function and electrical specs, but in 16-pin PDIP (N) package instead of SOIC (D) | Preferred for through-hole prototyping or legacy board rework where SOIC footprint is unavailable | Select SN74LS173AN for breadboarding, socket-based testing, or replacement in existing DIP-based designs |
| SN74ALS173AN | Advanced Low-Power Schottky variant: lower ICC (12 mA typ), faster tPLH/tPHL (13 ns), tighter VIH/VIL thresholds (2.0 V / 0.8 V unchanged) | Better suited for high-density, low-power systems where thermal budget or speed margin is constrained | Choose SN74ALS173AN when upgrading legacy designs for improved timing margin or reduced supply current |
Compared with SN74LS173ADRG4, SN74LS173AN offers identical functionality in through-hole form for manual assembly and debugging, while SN74ALS173AN delivers measurable improvements in speed and power efficiency-making it ideal for next-generation revisions where performance headroom matters.
Availability
SN74LS173ADRG4 is available at Aetrix Electronics and suitable for industrial backplane bus buffering, legacy test equipment data latching, and microcontroller I/O expansion requiring stable component supply and long-term obsolescence management.
Supply support for SN74LS173ADRG4 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 founded in 1930, specializing in analog, embedded processing, and logic solutions for industrial, automotive, and communications markets.
The SN74LS173ADRG4 belongs to TI's legacy 74LS logic family, engineered specifically for robust, pin-compatible replacement of earlier 74-series registers in mission-critical 5 V TTL systems with strict timing and bus-loading requirements.
FAQ
What is the maximum clock frequency supported by the SN74LS173ADRG4?
The SN74LS173ADRG4 supports a maximum clock frequency of 50 MHz under recommended operating conditions (VCC = 5 V, TA = 25°C, CL = 45 pF). This value is confirmed in the switching characteristics table for the SN74LS173A variant and applies directly to SN74LS173ADRG4, which uses the same die and SOIC packaging.
Does the SN74LS173ADRG4 have an internal pull-up or pull-down on unused inputs?
No, the SN74LS173ADRG4 does not include internal pull-up or pull-down resistors. Per TI's recommended operating conditions, all unused inputs-including G1, G2, M, N, and CLR-must be externally tied to VCC or GND to prevent floating states and ensure predictable operation and noise immunity.
Can the SN74LS173ADRG4 drive standard TTL loads directly?
Yes, the SN74LS173ADRG4 can drive two standard 74LS TTL loads directly. Its output drive specifications (IOL = 12 mA, IOH = –2.6 mA) meet the fan-out requirements for Series 74LS, and the datasheet explicitly confirms that up to 128 SN74LS173ADRG4 outputs may share a common bus while maintaining valid logic levels.
What is the purpose of the dual output-control inputs M and N on the SN74LS173ADRG4?
The M and N inputs provide redundant, OR-ed active-low control of the 3-state outputs. Both must be low to enable normal Q outputs; asserting either high disables all four outputs to high-impedance. This design allows flexible system-level control-e.g., one signal can be used for local gating, the other for global bus arbitration-without modifying internal register state.
Is the SN74LS173ADRG4 RoHS compliant?
Yes, the SN74LS173ADRG4 is RoHS compliant. According to TI's Package Option Addendum, the part number SN74LS173AD (which includes the RLG4 suffix variant) carries "Yes" in the RoHS column and uses NiPdAu (NIPDAU) lead finish, meeting EU Directive 2011/65/EU requirements for hazardous substances.
SN74LS173ADRG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74LS
- 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:
- 50 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 5V, 45pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 2.6mA, 24mA
- Voltage - Supply:
- 4.75V ~ 5.25V
- Current - Quiescent (Iq):
- 24 mA
- Input Capacitance:
- -
- Operating Temperature:
- 0°C ~ 70°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SOIC
SN74LS173ADRG4 FAQ
1.How can I place an order for SN74LS173ADRG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74LS173ADRG4 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 SN74LS173ADRG4 reliable?
The price and inventory of SN74LS173ADRG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74LS173ADRG4 is usually 5 days.
3.What payment methods are accepted for SN74LS173ADRG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for SN74LS173ADRG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for SN74LS173ADRG4?
SN74LS173ADRG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your SN74LS173ADRG4 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 SN74LS173ADRG4?
For technical support, including SN74LS173ADRG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74LS173ADRG4 requirements.
6.How does Aetrix verify that SN74LS173ADRG4 is sourced from the original manufacturer or authorized distributors?
All SN74LS173ADRG4 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 SN74LS173ADRG4 meets industry standards.
7.What is the process for return or replacement of SN74LS173ADRG4?
All SN74LS173ADRG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74LS173ADRG4, 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 SN74LS173ADRG4 part is unused and in its original packaging.
Return procedure for SN74LS173ADRG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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