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NXP Semiconductors 74HC273DB,112
- Part No.:
- 74HC273DB,112
- Manufacturer:
- NXP Semiconductors
- Category:
- Flip Flops
- Package:
- 20-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
74HC273DB,112.pdf
- Description:
- IC OCTAL D F-F POS-EDGE 20SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,140
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Product details
Overview
74HC273DB,112 from Nexperia is an octal positive-edge-triggered D-type flip-flop with asynchronous master reset (MR), designed for synchronous data latching in digital logic systems. It operates across 2.0 V to 6.0 V supply, delivers propagation delay as low as 13 ns at VCC = 6.0 V, supports -40 °C to +125 °C ambient range, and features CMOS-level inputs with 3.5 pF input capacitance - used in bus interface buffering, state register storage, and clock-domain synchronization in industrial control logic.
For engineers reviewing the 74HC273DB,112 datasheet, 74HC273DB,112 pinout, 74HC273DB,112 application, or 74HC273DB,112 equivalent, key selection criteria include its single-clock/single-reset architecture, guaranteed setup/hold timing (tsu = 10 ns, th = 3 ns @ VCC = 6.0 V), SO20 package compatibility, and TTL-compatible 74HCT273 functional pairing for mixed-logic interfacing.
Technical Context
This device implements eight independent D-type flip-flops sharing a common clock (CP) and active-low master reset (MR), each sampling Dn on the LOW-to-HIGH transition of CP. Its internal structure includes input clamp diodes enabling overvoltage-tolerant interfacing via current-limiting resistors, and output stages rated for ±25 mA DC drive capability.
It complies with JEDEC JESD7A (2.0–6.0 V) and JESD8C (2.7–3.6 V), exhibits latch-up immunity >100 mA per JESD78 Class II Level B, and supports operation up to 122 MHz maximum clock frequency at VCC = 6.0 V with CL = 15 pF.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | 74HC high-speed CMOS - enables low-power operation with TTL-compatible drive strength and noise immunity. |
| Supply Voltage Range | 2.0 V to 6.0 V - supports direct interfacing with 3.3 V and 5 V logic domains without level translation. |
| Propagation Delay (tpd) | 13 ns (max) at VCC = 6.0 V - ensures tight timing margins in high-speed synchronous registers and pipeline stages. |
| Set-up / Hold Time | tsu = 10 ns, th = 3 ns @ VCC = 6.0 V - defines minimum data stability window before and after CP edge for reliable capture. |
| Output Drive Capability | ±25 mA per output - sufficient to directly drive multiple 74-series inputs or small LED indicators without buffers. |
| Operating Temperature | -40 °C to +125 °C - qualified for under-hood automotive modules, industrial PLC I/O, and extended-temperature embedded controllers. |
| Input Capacitance | 3.5 pF - minimizes capacitive loading on driving gates, preserving signal integrity in dense PCB layouts. |
Pinout & Package
74HC273DB,112 is supplied in SO20 (SOT163-1) plastic small outline package: 20-pin, 7.5 mm body width, gull-wing leads, JEDEC MS-013 compliant.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1 | MR | Asynchronous master reset input (active LOW); forces all Qn outputs LOW regardless of CP or Dn state. |
| 2 | Q0 | Data output for first flip-flop; mirrors D0 state after next valid CP edge if MR is HIGH. |
| 3 | D0 | Data input for first flip-flop; sampled on LOW-to-HIGH CP transition when MR = HIGH. |
| 4 | D1 | Data input for second flip-flop; electrically isolated but shares CP and MR with other stages. |
| 5 | Q1 | Data output for second flip-flop; provides synchronized, glitch-free latched value of D1. |
| 6 | Q2 | Data output for third flip-flop; enables parallel 8-bit data capture with single clock edge. |
| 7 | D2 | Data input for third flip-flop; part of octal D-input bank routed to respective Q outputs. |
| 8 | D3 | Data input for fourth flip-flop; supports byte-wide register file construction in microcontroller peripherals. |
| 9 | Q3 | Data output for fourth flip-flop; maintains state between clock edges with no internal feedback. |
| 10 | GND | Ground reference (0 V) for all internal circuitry and I/O; must be low-impedance connection. |
| 11 | CP | Clock input; triggers simultaneous sampling of all Dn inputs on LOW-to-HIGH transition. |
| 12 | Q4 | Data output for fifth flip-flop; used in address latch applications where stable bus values are required. |
| 13 | D4 | Data input for fifth flip-flop; matches pinout symmetry with D0–D3 and D5–D7 for layout efficiency. |
| 14 | D5 | Data input for sixth flip-flop; allows full 8-bit parallel load without external multiplexing. |
| 15 | Q5 | Data output for sixth flip-flop; provides deterministic timing relative to CP with <26 ns tPHL max. |
| 16 | Q6 | Data output for seventh flip-flop; supports dual-edge clock domain crossing when paired with complementary logic. |
| 17 | D6 | Data input for seventh flip-flop; referenced to same VIH/VIL thresholds as other inputs (1.5 V/0.5 V @ VCC = 2.0 V). |
| 18 | D7 | Data input for eighth flip-flop; completes octal data path; compatible with 74HCT273 for TTL-level source interfacing. |
| 19 | Q7 | Data output for eighth flip-flop; final bit of parallel register; used in status word assembly and interrupt masking logic. |
| 20 | VCC | Positive supply voltage input; decoupling capacitor (100 nF) required within 10 mm of this pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Wide supply range | 2.0 V to 6.0 V operation enables drop-in replacement across legacy 5 V and modern 3.3 V systems. |
| Asynchronous master reset | Single-pin MR asserts all eight outputs LOW independently of clock - critical for power-on initialization and fault recovery. |
| Input clamp diodes | Integrated protection allows safe interfacing to signals exceeding VCC using series current-limiting resistors. |
| High noise immunity | CMOS threshold ratios (VIH ≈ 70% VCC, VIL ≈ 30% VCC) provide >1.5 V noise margin at 5 V supply. |
| ESD robustness | HBM >2000 V and CDM >1000 V ensure reliability during board handling and automated assembly. |
Applications
| Industrial PLC I/O Expansion | Microcontroller Peripheral Interface |
|---|---|
|
Use Scenario: Latching 8-bit parallel sensor data from analog front-end ADCs before microcontroller readback. IC Role / Device Role / Timing Role: Synchronous data register holding sampled values until firmware initiates SPI/I²C transfer. Use Value: Eliminates metastability risk by providing deterministic edge-aligned capture with 3 ns hold time guarantee. |
Use Scenario: Extending GPIO count on resource-constrained MCUs via parallel port expansion. IC Role / Device Role / Timing Role: Output latch buffering MCU port writes; MR enables hardware reset of all extended outputs. Use Value: Reduces firmware overhead by offloading bit-banged parallel writes to dedicated hardware with single-cycle update. |
| Legacy Bus Interface Logic | Digital Test Equipment Signal Capture |
|
Use Scenario: Isolating and synchronizing 8-bit ISA or PCI bus data lines to local controller clocks. IC Role / Device Role / Timing Role: Level-shifting and clock-domain crossing register between asynchronous bus and synchronous core logic. Use Value: Enables clean handoff of burst-mode data with 13 ns tpd ensuring setup compliance even at 20 MHz bus rates. |
Use Scenario: Capturing real-time digital waveform samples from FPGA-based pattern generators. IC Role / Device Role / Timing Role: High-fidelity parallel sampler triggered by precision clock generator outputs. Use Value: Delivers sub-15 ns propagation skew across all 8 bits, preserving inter-channel timing relationships in captured traces. |
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 |
|---|---|---|---|
| 74HCT273DB,112 | TTL-compatible inputs (VIH = 2.0 V min), identical SO20 package and pinout. | Required when driving from 5 V TTL sources; higher input current (490 μA MR) vs. HC version (360 μA). | Select for mixed-logic systems where upstream drivers lack CMOS-level swing. |
| SN74HC273PWR | Texas Instruments TSSOP-20 variant; same electrical specs but 4.4 mm body width and thermal profile. | Better suited for space-constrained PCBs; requires rework of footprint and thermal relief design. | Choose when board area is limited and JEDEC MO-153 compliance is mandated. |
Compared with 74HC273DB,112, the 74HCT273DB,112 offers guaranteed TTL input compatibility at the cost of slightly higher static current, while SN74HC273PWR trades package size and thermal resistance for identical logic behavior - both require validation of board-level timing margins due to differing parasitic inductance/capacitance.
Availability
74HC273DB,112 is available at Aetrix Electronics and suitable for industrial PLC I/O expansion, microcontroller peripheral interface, and legacy bus interface logic requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC273DB,112 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
Nexperia is a global semiconductor expert delivering high-performance, reliable discrete, logic, and MOSFET solutions with focus on efficiency, miniaturization, and sustainability.
The 74HC273 belongs to Nexperia's standard logic portfolio, engineered for robust interoperability in industrial automation, consumer electronics, and communication infrastructure where predictable timing and wide-voltage operation are essential.
FAQ
What is the maximum clock frequency supported by 74HC273DB,112?
The 74HC273DB,112 supports up to 122 MHz maximum clock frequency at VCC = 6.0 V with CL = 15 pF, as specified in Table 7 of the datasheet. At VCC = 4.5 V, fmax drops to 103 MHz. These values assume proper PCB layout, decoupling, and load conditions - actual system-level frequency may be lower due to trace inductance and fanout capacitance.
Can 74HC273DB,112 drive LEDs directly?
Yes - each output can sink or source up to ±25 mA DC, sufficient to drive standard 2 mA–10 mA indicator LEDs with appropriate series resistors. For example, at VCC = 5 V and VOH = 4.32 V (IO = −4.0 mA), a 330 Ω resistor yields ~2.1 mA LED current. Ensure total ICC remains below 50 mA and thermal limits are observed under sustained load.
Is the MR pin debounced internally?
No - the MR pin has no internal debounce circuitry. It is a purely combinational asynchronous input; external RC filtering or firmware-controlled synchronization is required if driven by mechanical switches or noisy control signals. The datasheet specifies MR pulse width minimum of 10 ns at VCC = 6.0 V, confirming sensitivity to fast transients.
Does 74HC273DB,112 support hot insertion?
No - the device lacks hot-swap protection features such as power-up sequencing control, I²T-rated clamps, or back-drive tolerance. Applying VCC while signals are present may exceed absolute maximum ratings (e.g., VI > VCC + 0.5 V). Always power VCC before applying input signals, and use series resistors if live insertion is unavoidable.
74HC273DB,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 20-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 122 MHz
- Max Propagation Delay @ V, Max CL:
- 26ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 8 µA
- Input Capacitance:
- 3.5 pF
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SSOP
74HC273DB,112 FAQ
1.How can I place an order for 74HC273DB,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC273DB,112 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 74HC273DB,112 reliable?
The price and inventory of 74HC273DB,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC273DB,112 is usually 5 days.
3.What payment methods are accepted for 74HC273DB,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC273DB,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC273DB,112?
74HC273DB,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC273DB,112 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 74HC273DB,112?
For technical support, including 74HC273DB,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC273DB,112 requirements.
6.How does Aetrix verify that 74HC273DB,112 is sourced from the original manufacturer or authorized distributors?
All 74HC273DB,112 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 74HC273DB,112 meets industry standards.
7.What is the process for return or replacement of 74HC273DB,112?
All 74HC273DB,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC273DB,112, 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 74HC273DB,112 part is unused and in its original packaging.
Return procedure for 74HC273DB,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC273DB,112 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
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