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STMicroelectronics M74HC273RM13TR
- Part No.:
- M74HC273RM13TR
- Manufacturer:
- STMicroelectronics
- Category:
- Flip Flops
- Package:
- 20-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
M74HC273RM13TR.pdf
- Description:
- IC FF D-TYPE SNGL 8BIT 20SOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,224
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Product details
Overview
M74HC273RM13TR from STMicroelectronics is a high-speed CMOS octal D-type flip-flop with asynchronous master clear, fabricated in silicon gate C2MOS technology. It features 8 edge-triggered D inputs synchronized to the positive-going clock edge, active-low synchronous reset (CLEAR), 66 MHz max clock frequency at VCC = 6 V, ±4 mA output drive, and operation across 2–6 V supply. It is used in digital control registers, data latching, and state-holding circuits in industrial PLC I/O modules.
For engineers reviewing the M74HC273RM13TR datasheet, M74HC273RM13TR pinout, M74HC273RM13TR application, or M74HC273RM13TR equivalent, key selection criteria include propagation delay symmetry (tPLH ≅ tPHL), noise immunity (VNIH/VNIL ≥ 28% VCC), low ICC (≤4 µA at TA = 25°C), TSSOP-20 package compatibility, and functional equivalence to 74-series 273 logic.
Technical Context
The M74HC273RM13TR implements eight independent D-type flip-flops sharing a common clock and asynchronous CLEAR input. Each stage samples Dn on the rising edge of CLOCK and updates Qn synchronously; CLEAR forces all Q outputs low regardless of clock or data state.
Its C2MOS process enables rail-to-rail input voltage tolerance (VI = 0 to VCC), symmetrical output impedance (|IOH| = IOL ≥ 4 mA), and balanced propagation delays (tPLH/tPHL ≤ 37 ns at VCC = 6 V). The device meets industrial temperature range (−55°C to +125°C) and supports fast edge rates (tr/tf ≤ 400 ns at VCC = 6 V).
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Logic Family | High-speed CMOS (74HC), pin- and function-compatible with 74LS273 |
| Supply Voltage Range | 2 V to 6 V - supports mixed-voltage system interfacing and battery-backed operation |
| Max Clock Frequency | 66 MHz (typ.) at VCC = 6 V - enables high-throughput data capture in real-time control loops |
| Output Drive Strength | ±4 mA (min.) - sufficient to directly drive multiple 74HC inputs or small LED loads without buffering |
| Propagation Delay (CLOCK→Q) | 15–37 ns (max. over temp/voltage) - ensures predictable timing margins in synchronous state machines |
| Quiescent Supply Current | 4 µA (max. at TA = 25°C) - critical for ultra-low-power standby modes in energy-sensitive systems |
| Noise Immunity | VNIH/VNIL ≥ 28% VCC (min.) - rejects transient coupling in noisy industrial environments |
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 active-low master reset - overrides clock and data to force all Q outputs LOW |
| 2, 5, 6, 9, 12, 15, 16, 19 | Q0–Q7 | True (non-inverted) registered outputs - retain 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 - require stable setup/hold (ts ≥ 3 ns, th = 0 ns at VCC = 6 V) |
| 11 | CLOCK | Edge-triggered input - only rising transitions cause state update; immune to glitches below pulse width spec |
| 10 | GND | Reference ground plane - must be low-impedance connection to minimize switching noise coupling |
| 20 | VCC | Positive supply - decoupling capacitor (100 nF) required within 1 cm for stable high-speed operation |
Key Features
| Feature | Design Value |
|---|---|
| Symmetric propagation delays | tPLH ≅ tPHL ensures minimal skew between rising/falling output transitions in timing-critical paths |
| Wide supply voltage range | 2–6 V operation allows direct interface with 3.3 V microcontrollers and legacy 5 V logic without level shifters |
| High noise immunity | 28% VCC noise margin reduces false triggering in electrically harsh factory-floor environments |
| Low power consumption | 4 µA max ICC enables multi-stage register banks in always-on monitoring subsystems |
| ESD-protected inputs | Integrated protection circuits withstand ±2 kV HBM - eliminates need for external TVS in most board-level designs |
Applications
| Industrial I/O Expansion | Programmable Logic Controller (PLC) Register Bank |
|---|---|
|
Use Scenario: Latching sensor status bits from parallel input modules before CPU readback. IC Role / Device Role / Timing Role: Synchronous data capture register with common clock and global reset for deterministic sampling. Use Value: Ensures glitch-free capture of 8-bit status words under variable scan cycle timing, meeting IEC 61131-3 cycle consistency requirements. |
Use Scenario: Holding output command states during PLC scan execution to prevent spurious actuator activation. IC Role / Device Role / Timing Role: Output hold register updated only on scan completion interrupt edge, isolated from internal CPU bus activity. Use Value: Eliminates metastability risk and guarantees atomic 8-bit output updates, satisfying SIL-2 functional safety timing constraints. |
| Test Equipment Pattern Generator | Legacy Bus Interface Buffer |
|
Use Scenario: Generating precise, repeatable stimulus waveforms for digital circuit validation. IC Role / Device Role / Timing Role: Edge-aligned waveform storage element synchronized to pattern generator master clock. Use Value: Delivers sub-40 ns timing resolution and <1 ns skew across 8 channels, enabling accurate setup/hold verification of DUTs. |
Use Scenario: Interfacing modern microcontrollers to legacy 8-bit parallel buses (e.g., ISA, PC/104). IC Role / Device Role / Timing Role: Level-shifting and timing isolation buffer between mismatched voltage domains and clock domains. Use Value: Allows 3.3 V SoC to safely drive 5 V bus lines with controlled slew rate and no DC current injection into legacy peripherals. |
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 |
|---|---|---|---|
| SN74HC273PWR | Same logic function, but TI part uses different C2MOS process; tPHL/tPLH asymmetry up to 15% higher; ICC = 8 µA (max) | Valid for commercial-temp (−40°C to +85°C) designs only; not qualified for extended industrial range | Select when cost sensitivity outweighs extended temperature requirement and tighter delay matching |
| 74VHC273FT | Higher speed (fMAX = 110 MHz @ VCC = 5 V), lower CPD (35 pF), but CLEAR is synchronous, not asynchronous | Requires redesign of reset sequencing logic; unsuitable where immediate forced reset is mandatory | Choose only if system already uses synchronous reset architecture and requires >80 MHz operation |
Compared with SN74HC273PWR and 74VHC273FT, the M74HC273RM13TR uniquely combines true asynchronous CLEAR, −55°C to +125°C qualification, and matched tPLH/tPHL performance - making it the sole option for fail-safe industrial control registers requiring guaranteed immediate reset and wide-temperature stability.
Availability
M74HC273RM13TR is available at Aetrix Electronics and suitable for industrial I/O expansion, PLC register banks, test equipment pattern generation, and legacy bus interface buffering requiring stable component supply across long production lifecycles.
Supply support for M74HC273RM13TR 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, Switzerland, specializing in automotive, industrial, and power management ICs with vertical manufacturing capability.
The M74HC273RM13TR belongs to ST's legacy HC logic family, designed specifically for robust, drop-in replacement of 74LS logic in industrial automation and instrumentation where reliability, wide temperature range, and low static power are essential.
FAQ
Is M74HC273RM13TR pin-compatible with 74LS273?
Yes - it is fully pin- and function-compatible with 74LS273, including identical pinout (TSSOP-20), active-low CLEAR, and positive-edge clock triggering. However, it operates at 2–6 V (vs. 5 V only for LS), draws significantly less quiescent current, and offers higher noise immunity and speed.
What is the minimum pulse width required on the CLEAR input?
The minimum CLEAR pulse width is 6 ns (typ.) at VCC = 6 V, and 13 ns (max.) over full temperature and voltage range. This ensures reliable asynchronous reset even under fast transient conditions, verified per AC electrical characteristics table on page 5 of the official datasheet.
Can M74HC273RM13TR drive standard TTL inputs directly?
Yes - its VOH ≥ 4.18 V and VOL ≤ 0.26 V at IO = ±4 mA (VCC = 4.5 V) exceed TTL input thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V), enabling direct interfacing without level-shifting circuitry in mixed-logic systems.
Does this device require external pull-up resistors on unused inputs?
No - all inputs include integrated protection diodes and have defined logic thresholds. Unused inputs must be tied HIGH or LOW per design intent; floating inputs are prohibited due to increased ICC and potential oscillation, as specified in the "DC Input Voltage" operating condition limits.
M74HC273RM13TR Specifications
- Product attributes
- Attribute value
- Manufacturer:
- STMicroelectronics
- Series:
- 74HC
- Package/Case:
- 20-SOIC (0.295", 7.50mm 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:
- 66 MHz
- Max Propagation Delay @ V, Max CL:
- 25ns @ 6V, 50pF
- Trigger Type:
- Positive Edge
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2V ~ 6V
- Current - Quiescent (Iq):
- 4 µA
- Input Capacitance:
- 5 pF
- Operating Temperature:
- -55°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 20-SO
M74HC273RM13TR FAQ
1.How can I place an order for M74HC273RM13TR through Aetrix?
Please submit a Request for Quotation (RFQ) for M74HC273RM13TR 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 M74HC273RM13TR reliable?
The price and inventory of M74HC273RM13TR are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for M74HC273RM13TR is usually 5 days.
3.What payment methods are accepted for M74HC273RM13TR?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for M74HC273RM13TR transactions.
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4.How is shipping managed for M74HC273RM13TR?
M74HC273RM13TR orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your M74HC273RM13TR 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 M74HC273RM13TR?
For technical support, including M74HC273RM13TR datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your M74HC273RM13TR requirements.
6.How does Aetrix verify that M74HC273RM13TR is sourced from the original manufacturer or authorized distributors?
All M74HC273RM13TR 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 M74HC273RM13TR meets industry standards.
7.What is the process for return or replacement of M74HC273RM13TR?
All M74HC273RM13TR units undergo pre-shipment inspection (PSI). If there is an issue with M74HC273RM13TR, 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 M74HC273RM13TR part is unused and in its original packaging.
Return procedure for M74HC273RM13TR:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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