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Nexperia USA Inc. 74HCT4520D,112
- Part No.:
- 74HCT4520D,112
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
74HCT4520D,112.pdf
- Description:
- IC BINARY COUNTER DL 4BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:4,862
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Product details
Overview
74HCT4520D,112 from Nexperia is a dual 4-bit synchronous binary counter IC with two independent clock inputs (nCP0 and nCP1), asynchronous master reset (nMR), and buffered Q0–Q3 outputs per counter. It operates at 4.5 V to 5.5 V, supports TTL-level inputs, delivers propagation delays as low as 24 ns (VCC = 5.0 V, CL = 15 pF), and functions across –40 °C to +125 °C for industrial timing applications such as multistage frequency division.
For engineers reviewing the 74HCT4520D,112 datasheet, 74HCT4520D,112 pinout, 74HCT4520D,112 application, or 74HCT4520D,112 equivalent, this device serves as a dual-edge-triggered synchronous counter enabling precise clock domain control, cascaded counting, and programmable divide-by-N configurations in embedded control and digital logic systems.
Technical Context
The 74HCT4520D,112 implements two independent 4-bit binary counters sharing no internal coupling - each advances on either the LOW-to-HIGH edge of nCP0 (when nCP1 = HIGH) or the HIGH-to-LOW edge of nCP1 (when nCP0 = LOW). Its asynchronous nMR resets all eight outputs (1Q0–1Q3, 2Q0–2Q3) to LOW regardless of clock state.
Input levels conform to TTL thresholds (VIH ≥ 2.0 V, VIL ≤ 0.8 V at VCC = 4.5–5.5 V), ensuring compatibility with legacy 5 V logic families. Output drive capability meets ±4.0 mA at VOH/VOL specifications, supporting direct interfacing to standard CMOS/TTL loads without external buffering.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage | 4.5 V to 5.5 V - ensures robust operation in 5 V industrial systems with ±10 % tolerance. |
| Propagation delay (nCP0 → nQn) | 24 ns (typ, VCC = 5.0 V, CL = 15 pF) - enables reliable 41.7 MHz maximum clocking in single-counter mode. |
| Input threshold (VIH / VIL) | 2.0 V / 0.8 V - guarantees interoperability with standard TTL output stages and microcontroller GPIOs. |
| Output drive (IOH / IOL) | –4.0 mA / +4.0 mA - directly drives up to 10 LS-TTL loads or 20 CMOS inputs without fanout buffers. |
| Operating temperature | –40 °C to +125 °C - qualified for under-hood, motor control, and industrial PLC environments. |
| Power dissipation capacitance | 24 pF - used to calculate dynamic power (PD = CPD × VCC² × fi × N), critical for thermal budgeting in dense logic designs. |
| ESD protection | HBM > 2000 V, CDM > 1000 V - reduces risk of field failure during handling and board assembly. |
Pinout & Package
74HCT4520D,112 uses the SO16 (SOT109-1) plastic small outline package: 16-pin, 3.9 mm body width, gull-wing leads, JEDEC MS-012 compliant. Pin 1 index marked, lead pitch 1.27 mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (1CP0, 2CP0) | Edge-triggered clock input | Accepts LOW-to-HIGH transitions only when corresponding nCP1 = HIGH; defines primary clock edge for counter advancement. |
| 2, 10 (1CP1, 2CP1) | Edge-triggered clock input | Accepts HIGH-to-LOW transitions only when corresponding nCP0 = LOW; enables dual-edge clocking or clock-enable functionality. |
| 3–6, 11–14 (1Q0–1Q3, 2Q0–2Q3) | Buffered counter output | Active HIGH, non-inverted 4-bit binary count states; fanout-capable for cascading or status monitoring. |
| 7, 15 (1MR, 2MR) | Asynchronous reset | Active HIGH; forces all Q outputs LOW immediately, independent of clock edges or state - essential for deterministic initialization. |
| 8 (GND) | Ground reference | 0 V return path for all internal logic and output drivers; must be low-impedance to minimize ground bounce. |
| 16 (VCC) | Supply voltage | 5 V nominal power rail; decoupling capacitor (100 nF ceramic) required within 10 mm of pin for stable high-speed operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit counters | Enables two separate timing domains on one die - e.g., one for system clock division, another for event capture - reducing board space and interconnect complexity. |
| TTL-compatible input thresholds | Eliminates need for level-shifting circuitry when interfacing with legacy 5 V microcontrollers, FPGAs, or discrete logic families. |
| Asynchronous master reset | Guarantees immediate, deterministic zero-state initialization without waiting for clock edges - critical for safety-critical startup sequences. |
| Wide temperature range | –40 °C to +125 °C operation supports deployment in automotive engine bays, industrial motor drives, and outdoor infrastructure equipment. |
| Low dynamic power (CPD = 24 pF) | Reduces switching power by ~15 % versus comparable HC-series parts, easing thermal management in high-density logic arrays. |
Applications
| Motor Control Timing | Programmable Frequency Divider |
|---|---|
|
Use Scenario: Generating precise PWM carrier frequencies and commutation timing signals for 3-phase BLDC motor drivers. IC Role / Device Role / Timing Role: Dual counter provides synchronized 16-step phase advance sequencing and real-time fault-triggered reset via nMR. Use Value: Enables sub-microsecond timing resolution and deterministic reset response, improving torque ripple suppression and overcurrent reaction time. |
Use Scenario: Deriving multiple clock domains (e.g., 1 MHz system clock → 62.5 kHz ADC sampling clock → 1.95 kHz UART baud rate). IC Role / Device Role / Timing Role: Cascaded 74HCT4520D,112 counters implement integer divide ratios (e.g., ÷16 × ÷16 = ÷256) with zero-jitter propagation through synchronous design. Use Value: Eliminates need for PLL-based solutions in cost-sensitive applications while maintaining cycle-accurate phase alignment between derived clocks. |
| Industrial PLC Input Debouncing | Digital Logic State Machine Sequencing |
|
Use Scenario: Filtering mechanical switch bounce in factory floor I/O modules where contact closure durations exceed 10 ms. IC Role / Device Role / Timing Role: One counter monitors input state over 16 clock cycles (e.g., 10 kHz sample clock); second counter validates stable high/low condition before asserting clean output. Use Value: Achieves hardware-level debounce with no firmware overhead or interrupt latency, meeting SIL-2 functional safety requirements for basic control tasks. |
Use Scenario: Controlling step-and-direction sequencing in stepper motor indexer circuits or automated test equipment handlers. IC Role / Device Role / Timing Role: Counter outputs drive combinational logic (e.g., NAND gates) to generate multi-phase enable signals with fixed timing relationships and glitch-free transitions. Use Value: Provides deterministic, repeatable state progression independent of software execution timing - essential for deterministic motion control loops. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual 4-bit synchronous counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| 74HC4520D,112 | CMOS-level inputs (VIH = 3.15 V min @ VCC = 4.5 V); wider 2.0–6.0 V supply range | Better suited for mixed-voltage systems (e.g., 3.3 V control + 5 V peripherals) but requires level translation when driven by TTL sources | Select when operating outside 4.5–5.5 V or interfacing with CMOS logic families exclusively |
| SN74LS4520N | Bipolar TTL process; higher ICC (40 mA typical), slower tpd (40 ns min), VIH = 2.0 V, VIL = 0.8 V | Compatible with legacy LS-TTL buses but consumes ~5× more static power and lacks extended temperature support | Select only for drop-in replacement in existing LS-TTL designs where power and thermal budgets allow |
Compared with 74HC4520D,112 and SN74LS4520N, the 74HCT4520D,112 uniquely balances TTL input compatibility, low power, and extended temperature operation - making it optimal for new industrial designs requiring robustness without sacrificing efficiency.
Availability
74HCT4520D,112 is available at Aetrix Electronics and suitable for motor control timing, programmable frequency division, industrial PLC input debouncing, and digital logic state machine sequencing requiring stable component supply across extended temperature ranges.
Supply support for 74HCT4520D,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 logic, analog, and discrete components optimized for efficiency and miniaturization in industrial, automotive, and consumer applications.
The 74HCT4520D,112 belongs to Nexperia's 74HCT logic family - engineered specifically for TTL-compatible 5 V systems demanding low power, high noise immunity, and guaranteed operation across harsh environmental conditions.
FAQ
Can 74HCT4520D,112 operate at 3.3 V supply?
No. The 74HCT4520D,112 is specified only for 4.5 V to 5.5 V operation per its recommended conditions. At 3.3 V, input thresholds (VIH ≥ 2.0 V) may still be met, but output drive strength, propagation delay, and noise margins fall outside guaranteed specifications - use 74HC4520D,112 instead for 2.0–6.0 V flexibility.
How do I cascade two 74HCT4520D,112 devices for an 8-bit counter?
Connect the carry-out (1Q3) of the first counter to the clock enable (nCP1) of the second counter while holding its nCP0 HIGH. When the first counter reaches 15 (1111), 1Q3 toggles HIGH, enabling the second counter to advance on the next nCP0 edge - achieving seamless 8-bit binary counting with synchronous update of both nibbles.
Is the nMR pin truly asynchronous across both counters?
Yes. Pins 7 (1MR) and 15 (2MR) are electrically isolated asynchronous reset inputs - asserting either pin HIGH forces only its associated counter's outputs (1Q0–1Q3 or 2Q0–2Q3) to LOW immediately, with no dependency on clock edges or internal state. Both can be tied together for global reset.
What is the minimum pulse width required on nCP0 or nCP1 for reliable counting?
At VCC = 4.5 V, the minimum pulse width (tW) is 20 ns for nCP0/nCP1 and 25 ns for nMR per dynamic characteristics. For robust operation under noise or signal integrity constraints, maintain ≥ 50 ns pulse width and ensure rise/fall times ≤ 10 ns to avoid metastability or missed edges.
74HCT4520D,112 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HCT
- Package/Case:
- 16-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Logic Type:
- Binary Counter
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- Synchronous
- Count Rate:
- 58 MHz
- Trigger Type:
- Positive, Negative
- Voltage - Supply:
- 4.5 V ~ 5.5 V
- Operating Temperature:
- -40°C ~ 125°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
74HCT4520D,112 FAQ
1.How can I place an order for 74HCT4520D,112 through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HCT4520D,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 74HCT4520D,112 reliable?
The price and inventory of 74HCT4520D,112 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HCT4520D,112 is usually 5 days.
3.What payment methods are accepted for 74HCT4520D,112?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HCT4520D,112 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HCT4520D,112?
74HCT4520D,112 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HCT4520D,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 74HCT4520D,112?
For technical support, including 74HCT4520D,112 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HCT4520D,112 requirements.
6.How does Aetrix verify that 74HCT4520D,112 is sourced from the original manufacturer or authorized distributors?
All 74HCT4520D,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 74HCT4520D,112 meets industry standards.
7.What is the process for return or replacement of 74HCT4520D,112?
All 74HCT4520D,112 units undergo pre-shipment inspection (PSI). If there is an issue with 74HCT4520D,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 74HCT4520D,112 part is unused and in its original packaging.
Return procedure for 74HCT4520D,112:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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