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NXP Semiconductors 74HC423N,652
- Part No.:
- 74HC423N,652
- Manufacturer:
- NXP Semiconductors
- Category:
- Multivibrators
- Package:
- 16-DIP (0.300", 7.62mm)
- Datasheet:
-
74HC423N,652.pdf
- Description:
- IC MULTIVIBRATOR 20NS 16DIP
- Quantity:
- Payment:
- Shipping:
Inventory:3,927
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Product details
Overview
74HC423N,652 from NXP Semiconductors is a dual retriggerable monostable multivibrator with independent reset inputs, implemented in high-speed Si-gate CMOS technology and pin compatible with LSTTL. It provides two independent timing channels, each with active-HIGH (nB) and active-LOW (nA) edge-triggered inputs, Schmitt-trigger input hysteresis, and direct active-LOW reset (nRD). It operates from 2.0 V to 6.0 V across −40 °C to +125 °C and is used in pulse stretching, debounce, and programmable delay circuits.
For engineers reviewing the 74HC423N,652 datasheet, 74HC423N,652 pinout, 74HC423N,652 application, or 74HC423N,652 equivalent, key selection criteria include external REXT/CEXT timing control, retriggerable pulse extension capability up to 100 % duty factor, Schmitt-trigger noise immunity on nA/nB inputs, and guaranteed operation over automotive-grade temperature range.
Technical Context
The 74HC423N,652 implements two independent monostable circuits, each with dual-edge triggering (nA: falling edge, nB: rising edge) and separate reset (nRD). Pulse width is set by external REXT and CEXT components, with minimum width determined by internal propagation delays (e.g., 23 ns at VCC = 6.0 V) and extended via retriggering before timeout.
Its Schmitt-trigger inputs tolerate slow rise/fall times, and reset forces nQ LOW / nQ HIGH while inhibiting further triggering. Unlike the 74HC123 family, it cannot be triggered via the reset input - reset is strictly asynchronous termination only.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 2.0 V to 6.0 V - supports mixed-voltage logic interfacing and battery-backed systems |
| Operating temperature | −40 °C to +125 °C - qualified for under-hood automotive and industrial control environments |
| Propagation delay | 23 ns (max, VCC = 6.0 V) - enables sub-40 MHz timing resolution in fast digital systems |
| Output drive | ±25 mA - sufficient to directly drive LEDs, small relays, or TTL/CMOS fan-out loads |
| Input hysteresis | Schmitt-trigger on nA/nB - rejects noise on slow-switching signals such as mechanical switch inputs |
| Timing control | REXT (2–1000 kΩ) + CEXT (no upper limit) - supports pulse widths from ~75 ns to seconds |
| ESD rating | HBM > 2000 V, MM > 200 V - robust handling in manual assembly and field-replaceable modules |
Pinout & Package
DIP16 plastic dual in-line package (300 mil), 16-pin through-hole format with standard 0.1″ row spacing and 0.3″ body width per JEDEC MS-001.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (1A, 2A) | Trigger input (falling edge) | Active-LOW edge detection; initiates or extends output pulse on negative transition |
| 2, 10 (1B, 2B) | Trigger input (rising edge) | Active-HIGH edge detection; alternate trigger path for same channel |
| 3, 11 (1RD, 2RD) | Reset input (active LOW) | Asynchronously forces nQ = LOW / nQ = HIGH and blocks new triggers |
| 4, 12 (1Q, 2Q) | Inverted output | Complementary active-LOW output; drives logic LOW during monostable period |
| 5, 13 (1Q, 2Q) | Non-inverted output | Complementary active-HIGH output; drives logic HIGH during monostable period |
| 6, 14 (1CEXT, 2CEXT) | External capacitor connection | Connects timing capacitor to ground; decouples timing node from supply noise |
| 7, 15 (1REXT/CEXT, 2REXT/CEXT) | Resistor/capacitor junction | Node where external resistor ties to CEXT; sets RC time constant for base pulse width |
| 8 | GND | Ground reference for all inputs, outputs, and internal circuitry |
| 16 | VCC | Positive supply rail; powers internal logic and output drivers |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent monostables | Two fully isolated timing channels share no internal coupling - enables parallel pulse generation |
| Retriggerable operation | Each channel's output pulse can be extended indefinitely by repeated nA/nB edges - supports variable-duration gating |
| Direct asynchronous reset | nRD terminates ongoing pulses immediately and prevents new triggers - critical for safety-critical timeout enforcement |
| Schmitt-trigger inputs | nA/nB inputs reject <100 mV noise on slow edges - eliminates need for external RC filtering in switch debounce |
| JEDEC 7A compliance | Guaranteed pin compatibility with LSTTL logic families - enables drop-in replacement in legacy designs |
Applications
| Switch Debounce | Pulse Stretching |
|---|---|
Use Scenario: Mechanical pushbutton or rotary encoder interfaced to microcontroller GPIO without hardware filtering. IC Role / Device Role / Timing Role: Monostable acts as hardware-level debouncer, generating clean single-pulse output per contact closure. Use Value: Eliminates firmware polling or software timers; guarantees ≤30 ns jitter and immunity to bounce durations up to 10 ms. | Use Scenario: Short enable signal from FPGA must be extended to meet minimum pulse width requirement of power sequencer IC. IC Role / Device Role / Timing Role: 74HC423N,652 stretches incoming strobe into configurable duration output using REXT/CEXT. Use Value: Provides precise, temperature-stable pulse extension (e.g., 100 µs to 10 ms) without FPGA resource usage or PLL overhead. |
| Timeout Monitoring | Serial Data Framing |
Use Scenario: System watchdog requires periodic "alive" pulse; missing pulse triggers shutdown. IC Role / Device Role / Timing Role: Retriggerable monostable resets its timer on each received pulse; output goes LOW if interval exceeds REXT×CEXT. Use Value: Detects communication loss within ±5 % tolerance over full temperature range; reset input allows manual system recovery. | Use Scenario: UART receiver needs start-bit detection window aligned to baud rate clock for glitch-free framing. IC Role / Device Role / Timing Role: Generates precise start-bit sampling window synchronized to falling edge of RX line. Use Value: Enables reliable start-bit capture even with noisy RS-232 lines; Schmitt inputs suppress false triggers from EMI. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar monostable multivibrator applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC123N,652 | Non-retriggerable; reset input can also trigger; no Schmitt inputs on A/B | Fixed-width pulses only; less noise-immune on slow inputs | Select when deterministic one-shot behavior is required and retriggering is undesirable |
| SN74LV123AN | Lower VCC range (2.0–5.5 V); LV logic thresholds; no 125 °C rating | Not suitable for extended-temperature automotive use; optimized for 3.3 V systems | Select for cost-sensitive 3.3 V industrial controls where −40 °C to +85 °C suffices |
Compared with 74HC123N,652 and SN74LV123AN, the 74HC423N,652 uniquely combines retriggerability, Schmitt-trigger noise immunity, and full −40 °C to +125 °C operation - making it the only choice for robust, variable-duration timing in harsh environments.
Availability
74HC423N,652 is available at Aetrix Electronics and suitable for automotive engine control units, industrial PLC I/O modules, and medical device power sequencing requiring stable component supply across extended temperature ranges.
Supply support for 74HC423N,652 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
NXP Semiconductors is a global semiconductor company headquartered in Eindhoven, Netherlands, specializing in secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HC423N,652 belongs to NXP's legacy HC logic family, designed for pin-compatible upgrades of TTL-based timing and control circuits with improved speed, noise immunity, and temperature resilience.
FAQ
What is the minimum pulse width achievable with 74HC423N,652?
The minimum pulse width of 74HC423N,652 is defined by internal propagation delays: 75 ns typical at VCC = 5.0 V with REXT = 5 kΩ and CEXT = 0 pF. This value scales with supply voltage and process variation but remains bounded by the device's intrinsic gate delays - not by external components - enabling nanosecond-precision short pulses.
Can 74HC423N,652 be used with a 3.3 V supply?
Yes, 74HC423N,652 operates reliably from 2.0 V to 6.0 V, including 3.3 V nominal systems. At VCC = 3.3 V, VIH is ~2.3 V and VIL is ~1.1 V per HC logic thresholds, ensuring compatibility with 3.3 V CMOS outputs. Propagation delay increases to ~35 ns (typical), and output drive remains ≥±15 mA.
How does the retrigger function work on 74HC423N,652?
Retriggering on 74HC423N,652 occurs when a new nA (falling) or nB (rising) edge arrives before the current output pulse expires. Each valid edge resets the internal timer, extending nQ HIGH / nQ LOW duration. The retrigger time trtrig depends on REXT and CEXT - e.g., ~110 ns minimum at VCC = 5.0 V with REXT = 5 kΩ and CEXT = 0 pF.
Is 74HC423N,652 pin-compatible with 74HC123N,652?
No - although both are dual monostables in DIP16 packages, 74HC423N,652 and 74HC123N,652 have different pinouts. For example, 74HC123N uses pins 1/2 for 1A/1B and pin 3 for 1RD, whereas 74HC423N assigns 1A to pin 1, 1B to pin 2, and 1RD to pin 3 - same numbering, but functional mapping differs for CEXT/REXT/outputs. PCB layout is not interchangeable.
What external components are required for basic operation of 74HC423N,652?
Each channel of 74HC423N,652 requires two external timing components: a resistor (REXT, 2–1000 kΩ) between pin 15/7 and VCC, and a capacitor (CEXT, no upper limit) between pin 14/6 and GND. These set the base pulse width tW ≈ 0.45 × REXT(kΩ) × CEXT(nF). No pull-ups or bypassing is mandatory beyond standard 100 nF VCC–GND decoupling.
74HC423N,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- NXP Semiconductors
- Series:
- 74HC
- Package/Case:
- 16-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Monostable
- Independent Circuits:
- 2
- Schmitt Trigger Input:
- No
- Propagation Delay:
- 20 ns
- Current - Output High, Low:
- 5.2mA, 5.2mA
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Through Hole
- Supplier Device Package:
- 16-DIP
74HC423N,652 FAQ
1.How can I place an order for 74HC423N,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC423N,652 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 74HC423N,652 reliable?
The price and inventory of 74HC423N,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC423N,652 is usually 5 days.
3.What payment methods are accepted for 74HC423N,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC423N,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC423N,652?
74HC423N,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC423N,652 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 74HC423N,652?
For technical support, including 74HC423N,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC423N,652 requirements.
6.How does Aetrix verify that 74HC423N,652 is sourced from the original manufacturer or authorized distributors?
All 74HC423N,652 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 74HC423N,652 meets industry standards.
7.What is the process for return or replacement of 74HC423N,652?
All 74HC423N,652 units undergo pre-shipment inspection (PSI). If there is an issue with 74HC423N,652, 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 74HC423N,652 part is unused and in its original packaging.
Return procedure for 74HC423N,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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