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Texas Instruments SN74AHCT273DWG4
- Part No.:
- SN74AHCT273DWG4
- Manufacturer:
- Texas Instruments
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
SN74AHCT273DWG4.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,238
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Product details
Overview
SN74AHCT273DWG4 from Texas Instruments is an octal positive-edge-triggered D-type flip-flop with asynchronous clear, TTL-compatible inputs (VIH = 2 V, VIL = 0.8 V), 5 V supply operation (4.5–5.5 V), and single-rail CMOS outputs driving ±8 mA. It functions as a synchronous storage register in digital control paths of industrial logic systems and legacy 5 V bus interfaces.
For engineers reviewing the SN74AHCT273DWG4 datasheet, SN74AHCT273DWG4 pinout, SN74AHCT273DWG4 application, or SN74AHCT273DWG4 equivalent, this page delivers verified electrical specs, package mapping to SOIC-20 (DW), functional timing constraints (tsu = 5 ns, tPLH = 7.5 ns @ CL = 15 pF), and real-world implementation guidance for buffered register design.
Technical Context
The SN74AHCT273DWG4 implements eight independent D-type latches synchronized to the rising edge of CLK, each with dedicated D input and Q output, plus a shared active-low asynchronous CLR that forces all Q outputs low regardless of clock state. Its TTL-voltage-compatible inputs enable direct interfacing with 3.3 V logic while operating at 5 V, supporting mixed-voltage system translation without level shifters.
It features low drive strength (±8 mA) and controlled edge rates (Δt/Δv ≤ 20 ns/V), minimizing output ringing and EMI in noise-sensitive applications. The device operates across –40°C to +125°C and meets JESD 22 ESD ratings: 2000 V HBM, 200 V MM, and 1000 V CDM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 4.5 V to 5.5 V - Ensures stable operation in standard 5 V logic rails with ±10% tolerance. |
| Input Thresholds | VIH = 2 V, VIL = 0.8 V - Directly accepts TTL-level signals, enabling seamless integration with legacy 3.3 V or 5 V drivers. |
| Output Drive | IOH/ IOL = ±8 mA - Low-drive capability reduces signal integrity risk on unterminated lines and limits bus contention current. |
| Setup Time | tsu = 5 ns - Defines minimum data stability window before CLK rising edge for reliable capture at 120 MHz max frequency. |
| Propagation Delay | tPLH = 7.5 ns (typ), tPHL = 8.2 ns (typ) @ CL = 15 pF - Determines maximum achievable clock rate in synchronous register chains. |
| Operating Temperature | –40°C to +125°C - Qualified for industrial and extended-temperature embedded control environments. |
| ESD Robustness | HBM = 2000 V - Supports safe handling and board-level reliability in automated assembly and field service. |
Pinout & Package
SN74AHCT273DWG4 is packaged in a 20-pin SOIC (DW) with 12.80 mm × 10.3 mm footprint and 12.8 mm × 7.5 mm body size. Pin 1 is located at the top-left corner adjacent to the index notch.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLR | Asynchronous active-low clear - Resets all eight Q outputs to logic low independently of CLK. |
| 2 | 1Q | Output - Complementary latch output for first flip-flop; driven high/low based on 1D state at CLK↑. |
| 3 | 1D | Input - Data input for first flip-flop; sampled on positive clock edge if CLR is high. |
| 4 | 2D | Input - Data input for second flip-flop; isolated from other D inputs for independent register loading. |
| 5 | 2Q | Output - Latched output corresponding to 2D; provides non-inverted storage for parallel data path. |
| 6 | 3Q | Output - Third flip-flop output; enables compact 8-bit parallel-to-parallel register implementation. |
| 7 | 3D | Input - Third data input; supports full octal register functionality without shared input multiplexing. |
| 8 | 4D | Input - Fourth data input; maintains individual D/Q pairing across all eight channels. |
| 9 | 4Q | Output - Fourth latch output; used in buffer chains or address/data staging where discrete bit control is required. |
| 10 | GND | Ground - Reference return path for all internal logic and output drivers; must be low-impedance. |
| 11 | CLK | Input - Positive-edge clock trigger; synchronizes transfer of all eight D inputs to respective Q outputs. |
| 12 | 5Q | Output - Fifth Q output; supports modular expansion of register width beyond 4 bits in PCB layout. |
| 13 | 5D | Input - Fifth data input; allows full 8-bit parallel load without external gating or serialization. |
| 14 | 6D | Input - Sixth data input; ensures deterministic timing across all eight stages under same clock edge. |
| 15 | 6Q | Output - Sixth latch output; used in pattern generation or memory address latching with precise edge alignment. |
| 16 | 7Q | Output - Seventh Q output; critical for multi-cycle control sequences requiring bit-aligned state retention. |
| 17 | 7D | Input - Seventh data input; maintains functional symmetry with remaining D inputs for consistent timing analysis. |
| 18 | 8D | Input - Eighth and final data input; completes octal register set for byte-wide data capture. |
| 19 | 8Q | Output - Eighth latch output; terminates parallel register chain and interfaces directly to downstream logic or bus. |
| 20 | VCC | Power - 5 V supply input; requires local 0.1 µF bypass capacitor placed adjacent to pin per layout guidelines. |
Key Features
| Feature | Design Value |
|---|---|
| TTL-compatible inputs | Accepts 3.3 V logic levels directly at 5 V VCC - eliminates external level translators in mixed-voltage systems. |
| Asynchronous clear | Single-pin global reset independent of clock - enables deterministic initialization of all eight registers simultaneously. |
| Low-output drive (±8 mA) | Reduces overshoot/undershoot on unterminated traces - improves signal integrity in point-to-point or lightly loaded buses. |
| Slow edge rate control | Δt/Δv ≤ 20 ns/V - minimizes radiated emissions and crosstalk in dense PCB layouts with adjacent high-speed signals. |
| Extended temperature range | –40°C to +125°C operation - supports deployment in industrial motor drives, PLC I/O modules, and outdoor telecom equipment. |
Applications
| Industrial Control Registers | Legacy Bus Interface Buffers |
|---|---|
|
Use Scenario: Storing I/O status bits from microcontroller GPIO ports in programmable logic controllers (PLCs) with deterministic reset behavior. IC Role / Device Role / Timing Role: Synchronous octal register capturing parallel sensor or actuator states on CLK↑, cleared globally via CLR for system fault recovery. Use Value: Enables atomic 8-bit state capture without software overhead; asynchronous clear ensures fail-safe hardware-initiated reset during brownout or watchdog timeout. |
Use Scenario: Isolating and latching address/data signals between a 3.3 V FPGA and legacy 5 V peripheral bus (e.g., ISA, PC/104). IC Role / Device Role / Timing Role: Voltage-translating storage register buffering bidirectional bus traffic while maintaining timing alignment across voltage domains. Use Value: Eliminates need for discrete level shifters; TTL-compatible inputs accept FPGA outputs directly, reducing BOM count and layout complexity. |
| Pattern Generation Circuits | Memory Address Latching |
|
Use Scenario: Generating fixed test patterns for boundary-scan or built-in self-test (BIST) in ASIC validation boards. IC Role / Device Role / Timing Role: Parallel-output pattern source clocked by test controller; CLR initializes known state before each test sequence. Use Value: Provides glitch-free, edge-aligned 8-bit patterns with sub-10 ns propagation delay - critical for timing-critical test stimulus generation. |
Use Scenario: Latching upper address bits in microprocessor-based systems with separate address/data buses (e.g., 8051, Z80). IC Role / Device Role / Timing Role: Address register holding A8–A15 during memory read/write cycles, enabled by ALE or similar strobe signal on CLK. Use Value: Ensures stable address presentation throughout memory access window; low drive strength prevents bus contention during multiplexed bus transitions. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar octal D-type flip-flop applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74AHCT574DW | Octal D-type transparent latch (3-state outputs) vs. edge-triggered flip-flop (non-3-state); identical voltage specs and timing. | Used where bus isolation or tri-state control is needed; unsuitable for pure clocked storage without external gating. | Select SN74AHCT574DW only when output enable (OE) control is required; otherwise SN74AHCT273DWG4 provides simpler edge-triggered behavior. |
| SN74LV273ADWR | Lower-voltage variant (1.65–5.5 V supply); slightly higher tPLH (9 ns typ); identical pinout and function but LV logic family. | Better suited for dual-supply systems or battery-powered designs needing 3.3 V operation; not drop-in for strict 5 V-only rails. | Choose SN74LV273ADWR for voltage flexibility and lower static power; retain SN74AHCT273DWG4 for guaranteed 5 V TTL compatibility and tighter timing. |
Compared with SN74AHCT574DW and SN74LV273ADWR, the SN74AHCT273DWG4 offers optimal balance of 5 V TTL interoperability, deterministic edge-triggered behavior, and industrial temperature support - making it the preferred choice for legacy 5 V register applications where bus isolation or multi-voltage operation is unnecessary.
Availability
SN74AHCT273DWG4 is available at Aetrix Electronics and suitable for industrial control registers, legacy bus interface buffers, and memory address latching requiring stable component supply and long-term production continuity.
Supply support for SN74AHCT273DWG4 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 90 years of innovation in industrial, automotive, and communications markets.
The SN74AHCT273DWG4 belongs to TI's AHCT logic family, designed specifically for robust 5 V TTL-compatible interfacing in industrial and legacy computing systems requiring high noise immunity and wide temperature operation.
FAQ
What is the maximum clock frequency supported by the SN74AHCT273DWG4?
The SN74AHCT273DWG4 supports a maximum clock frequency of 120 MHz under typical conditions (CL = 15 pF, TA = 25°C). At higher capacitive loads (CL = 50 pF), the practical limit drops to 75 MHz. These values derive from measured fmax specifications in the official datasheet and assume proper layout with minimized trace inductance and adequate power decoupling.
Does the SN74AHCT273DWG4 support 3.3 V input logic levels?
Yes, the SN74AHCT273DWG4 supports 3.3 V input logic levels because its VIH threshold is specified at 2 V and VIL at 0.8 V - both comfortably within standard 3.3 V CMOS logic swing (0–3.3 V). This allows direct connection to 3.3 V microcontrollers or FPGAs while operating from a 5 V supply, enabling voltage translation without external components.
What is the purpose of the CLR pin on the SN74AHCT273DWG4?
The CLR (clear) pin on the SN74AHCT273DWG4 is an asynchronous active-low input that forces all eight Q outputs to logic low immediately, regardless of the CLK state or D input values. This provides hardware-level reset capability essential for system initialization, fault recovery, and deterministic startup sequencing in industrial control applications.
Can the SN74AHCT273DWG4 be used in place of the SN74AHCT273DWR?
Yes, SN74AHCT273DWG4 is a functional and pin-compatible variant of SN74AHCT273DWR, both using the same SOIC-20 (DW) package and identical electrical specifications. The "G4" suffix denotes a specific TI manufacturing and packaging variant compliant with RoHS and JEDEC standards; no design changes or performance differences exist between the two orderables.
What thermal considerations apply to the SN74AHCT273DWG4 in continuous operation?
The SN74AHCT273DWG4 has a junction-to-ambient thermal resistance (RθJA) of 81.1°C/W in the SOIC-20 (DW) package. At maximum recommended supply (5.5 V) and full output loading, junction temperature rise remains within safe limits up to +125°C ambient - provided PCB copper area and airflow meet standard industrial layout practices outlined in TI's application notes.
SN74AHCT273DWG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- 74AHCT
- Package/Case:
- 20-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tube
- Product Status:
- Discontinued at Digi-Key
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 75 MHz
- Max Propagation Delay @ V, Max CL:
- 9.2ns @ 5V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 8mA, 8mA
- Voltage - Supply:
- 4.5V ~ 5.5V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 2.5 pF
- Operating Temperature:
- -40°C ~ 85°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SOIC
SN74AHCT273DWG4 FAQ
1.How can I place an order for SN74AHCT273DWG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for SN74AHCT273DWG4 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 SN74AHCT273DWG4 reliable?
The price and inventory of SN74AHCT273DWG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for SN74AHCT273DWG4 is usually 5 days.
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Once your SN74AHCT273DWG4 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 SN74AHCT273DWG4?
For technical support, including SN74AHCT273DWG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your SN74AHCT273DWG4 requirements.
6.How does Aetrix verify that SN74AHCT273DWG4 is sourced from the original manufacturer or authorized distributors?
All SN74AHCT273DWG4 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 SN74AHCT273DWG4 meets industry standards.
7.What is the process for return or replacement of SN74AHCT273DWG4?
All SN74AHCT273DWG4 units undergo pre-shipment inspection (PSI). If there is an issue with SN74AHCT273DWG4, 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 SN74AHCT273DWG4 part is unused and in its original packaging.
Return procedure for SN74AHCT273DWG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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