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STMicroelectronics 74VHCT273ATTR
- Part No.:
- 74VHCT273ATTR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74VHCT273ATTR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,249
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Product details
Overview
74VHCT273ATTR from STMicroelectronics is an octal D-type flip-flop with asynchronous clear, designed for high-speed synchronous data latching in 5V digital systems. It features 170 MHz max clock frequency (typ.), 8 mA output drive capability, TTL-compatible input thresholds (VIH ≥ 2 V, VIL ≤ 0.8 V), and operates across 4.5–5.5 V supply range. Used in address/data register stages of microcontroller peripherals and bus interface logic.
For engineers reviewing the 74VHCT273ATTR datasheet, 74VHCT273ATTR pinout, 74VHCT273ATTR application, or 74VHCT273ATTR equivalent, key selection criteria include propagation delay matching (tPLH/tPHL ≈ 8.2 ns @ 15 pF), power-down input/output protection, symmetrical output impedance, latch-up immunity, and TSSOP-20 package compatibility with legacy 74-series footprint constraints.
Technical Context
This device implements eight edge-triggered D flip-flops sharing a common clock and asynchronous active-low clear. Each flip-flop transfers the D-input state to its Q-output on the rising edge of CLOCK, with CLEAR overriding all other inputs to force Q low regardless of clock or data state.
It uses sub-micron C2MOS technology with double-layer metal wiring, enabling low ICC (4 µA max at 25°C) while maintaining robust noise immunity (VOLP ≤ 0.9 V) and wide input voltage tolerance (–0.5 V to +7.0 V independent of VCC). All I/O pins include ESD protection rated to 2 kV per HBM.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| fMAX | 170 MHz (typ.) at VCC = 5 V - enables high-throughput data capture in fast control loops and memory address staging. |
| tPLH / tPHL | 8.2 ns (max, CL = 15 pF) - ensures tight timing alignment between clock edge and output transition for synchronous bus interfaces. |
| IOH / IOL | ±8 mA (min) - supports direct driving of multiple TTL loads or fanout to 10 LS-TTL inputs without buffering. |
| VIL / VIH | 0.8 V (max) / 2.0 V (min) - guarantees reliable recognition of standard TTL logic levels when interfacing with legacy 5V logic families. |
| ICC (quiescent) | 4 µA (max) at TA = 25°C - minimizes standby power in battery-backed or energy-sensitive control modules. |
| VOLP | 0.9 V (max) - limits ground bounce and crosstalk during simultaneous output switching in dense PCB layouts. |
| Operating VCC | 4.5 V to 5.5 V - accommodates nominal 5V rails with ±10% tolerance, including noisy industrial power supplies. |
Pinout & Package
TSSOP-20 package: 6.5 mm × 4.4 mm body, 0.65 mm pitch, 1.2 mm height, lead-free and RoHS-compliant.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | CLEAR | Asynchronous master reset (active LOW); forces all Q outputs LOW independently of clock or data. |
| 2,5,6,9,12,15,16,19 | Q0–Q7 | Registered outputs; retain latched D-input state until next clock edge or CLEAR assertion. |
| 3,4,7,8,13,14,17,18 | D0–D7 | Data inputs; sampled on rising clock edge and transferred to corresponding Q outputs. |
| 11 | CLOCK | Edge-triggered input; rising edge initiates synchronous transfer from Dn to Qn. |
| 10 | GND | Reference ground terminal; must be low-impedance connection to minimize switching noise coupling. |
| 20 | VCC | Positive supply rail; decoupling capacitor (0.1 µF ceramic) required within 5 mm of this pin. |
Key Features
| Feature | Design Value |
|---|---|
| Power-down protection | All inputs/outputs tolerate 0–7 V regardless of VCC state - enables hot-plug and mixed-voltage system interoperability. |
| Symmetrical output drive | |IOH| = IOL = 8 mA (min) - eliminates skew between rising/falling transitions in bidirectional bus drivers. |
| Input ESD immunity | 2 kV HBM - reduces field failure risk in manual assembly and handling environments. |
| Latch-up immunity | Improved vs. standard CMOS - prevents destructive parasitic SCR conduction under transient overvoltage conditions. |
| Low dynamic noise | VOLP ≤ 0.9 V (CL = 50 pF) - maintains signal integrity in high-density routing with adjacent sensitive analog traces. |
Applications
| Microcontroller Address Latching | Industrial Bus Interface |
|---|---|
|
Use Scenario: Holding 8-bit address segments during multiplexed bus cycles in 8051 or Z80-based controllers. IC Role / Device Role / Timing Role: Synchronous register stage that isolates address lines from time-varying data bus activity. Use Value: Enables clean separation of address setup/hold timing from data read/write windows using single-edge clocking. |
Use Scenario: Buffering and synchronizing parallel I/O signals between PLC backplane and field I/O modules. IC Role / Device Role / Timing Role: Level-shifting and noise-immune data staging element in deterministic real-time control networks. Use Value: Provides guaranteed 8.2 ns propagation delay and 2 kV ESD protection for long-cable industrial environments. |
| Legacy System Emulation | Test Equipment Pattern Generation |
|
Use Scenario: Replacing obsolete 74LS273 in retro-computing hardware restoration projects. IC Role / Device Role / Timing Role: Pin- and function-compatible drop-in upgrade with lower power and higher speed. Use Value: Maintains identical board layout while reducing quiescent current from ~25 mA to 4 µA and doubling fMAX. |
Use Scenario: Generating stable, synchronized stimulus patterns for IC functional test fixtures. IC Role / Device Role / Timing Role: Deterministic waveform generator core with precise edge-aligned output timing. Use Value: Delivers 170 MHz clock-to-Q timing consistency across all eight channels for multi-pin parallel testing. |
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 |
|---|---|---|---|
| SN74VHCT273PW | TSSOP-20, same electrical specs, TI-branded; slightly higher ICC (6 µA max) and lower fMAX (160 MHz typ.) | Identical pinout and logic behavior; validated for TI-specific reference designs only | Select when sourcing from TI-authorized channels or aligning with TI-designated BOMs |
| MC74VHCT273ADT | SOIC-20 package; identical AC/DC specs but larger footprint and higher thermal resistance | Preferred for through-hole prototyping or legacy PCB rework where TSSOP reflow is unavailable | Choose when mechanical compatibility with existing SOIC footprints is mandatory |
Compared with SN74VHCT273PW and MC74VHCT273ADT, the 74VHCT273ATTR offers the highest fMAX (170 MHz), lowest ICC (4 µA), and smallest TSSOP-20 footprint - making it optimal for space-constrained, high-speed, low-power embedded control nodes.
Availability
74VHCT273ATTR is available at Aetrix Electronics and suitable for microcontroller address latching, industrial bus interface, legacy system emulation, and test equipment pattern generation requiring stable component supply and long-term lifecycle assurance.
Supply support for 74VHCT273ATTR 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
STMicroelectronics is a global semiconductor leader headquartered in Geneva, specializing in automotive, industrial, and power management ICs with broad portfolio coverage and vertical manufacturing capability.
The 74VHCT series targets high-speed, low-power 5V logic replacement for legacy TTL systems - emphasizing pin compatibility, improved noise margins, and enhanced robustness in harsh operating environments.
FAQ
Can the 74VHCT273ATTR operate with a 3.3V supply?
No. The 74VHCT273ATTR is specified only for 4.5–5.5 V operation. Its TTL-compatible inputs require ≥2 V VIH and ≤0.8 V VIL, which cannot be reliably met from a 3.3 V rail. For 3.3 V systems, consider the 74VHC273 or 74LVC273 families instead.
What is the minimum pulse width required on the CLEAR input?
The minimum CLEAR pulse width is 5.0 ns (low state) at VCC = 5.0 V, as specified in Table 8. This ensures reliable asynchronous reset across full temperature range (–55°C to +125°C) and load conditions.
Does the 74VHCT273ATTR support hot-swap insertion?
Yes. Power-down protection allows all inputs and outputs to tolerate voltages from –0.5 V to +7.0 V regardless of VCC state, enabling safe insertion into live backplanes or partially powered systems without damaging the device or host circuitry.
How does the output skew specification affect multi-bit timing?
Output-to-output skew (tOSLH/tOSHL ≤ 1.0 ns at CL = 50 pF) ensures that all eight Q outputs switch within 1 ns of each other, preserving data validity across parallel buses and minimizing setup/hold violations in downstream receivers.
74VHCT273ATTR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74VHCT
- Package/Case:
- 20-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- Function:
- Master Reset
- Type:
- D-Type
- Output Type:
- Non-Inverted
- Number of Elements:
- 1
- Number of Bits per Element:
- 8
- Clock Frequency:
- 160 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:
- 6 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-TSSOP
74VHCT273ATTR FAQ
1.How can I place an order for 74VHCT273ATTR through Aetrix?
Please submit a Request for Quotation (RFQ) for 74VHCT273ATTR 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 74VHCT273ATTR reliable?
The price and inventory of 74VHCT273ATTR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74VHCT273ATTR is usually 5 days.
3.What payment methods are accepted for 74VHCT273ATTR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74VHCT273ATTR transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74VHCT273ATTR?
74VHCT273ATTR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74VHCT273ATTR 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 74VHCT273ATTR?
For technical support, including 74VHCT273ATTR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74VHCT273ATTR requirements.
6.How does Aetrix verify that 74VHCT273ATTR is sourced from the original manufacturer or authorized distributors?
All 74VHCT273ATTR 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 74VHCT273ATTR meets industry standards.
7.What is the process for return or replacement of 74VHCT273ATTR?
All 74VHCT273ATTR units undergo pre-shipment inspection (PSI). If there is an issue with 74VHCT273ATTR, 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 74VHCT273ATTR part is unused and in its original packaging.
Return procedure for 74VHCT273ATTR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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