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Nexperia USA Inc. 74HC4520PW/S400J
- Part No.:
- 74HC4520PW/S400J
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
74HC4520PW/S400J.pdf
- Description:
- IC BIN COUNTER DL 4BIT 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:5,000
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Product details
Overview
74HC4520PW/S400J from NXP Semiconductors is a dual 4-bit binary up-counter IC with asynchronous reset, operating at 2V–6V supply, 25MHz max clock frequency, and TTL-compatible inputs. It functions as a synchronous counting element in timing control circuits for industrial PLC modules and digital instrumentation.
For engineers reviewing the 74HC4520PW/S400J datasheet, 74HC4520PW/S400J pinout, 74HC4520PW/S400J application, or 74HC4520PW/S400J equivalent, key selection criteria include dual-counter independence, asynchronous reset behavior, propagation delay (typ. 18ns at 4.5V), and SO-16 package thermal performance in high-density PCB layouts.
Technical Context
This device integrates two identical 4-bit binary up-counters in a single SO-16 package, each with independent clock and reset inputs. Count enable is implemented via gated clock logic, and carry-out signals are generated on overflow (Q3→Q4 transition) with active-high polarity.
The counters operate synchronously within each section but are electrically isolated between sections-no internal coupling exists. Input thresholds follow standard HC logic levels (VIH = 3.15V min at VCC = 4.5V), and output drive capability is ±5.2mA at VCC = 4.5V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply Voltage | 2.0V to 6.0V - supports mixed-voltage system interfacing and battery-powered operation down to 2V. |
| Max Clock Frequency | 25 MHz at VCC = 4.5V - enables precise 40ns timing resolution for event sequencing in control logic. |
| Propagation Delay | 18 ns typ. (CLK to Q) at VCC = 4.5V - ensures minimal skew in cascaded counter chains. |
| Output Drive | ±5.2 mA at VCC = 4.5V - directly drives multiple 74HC inputs without buffering in low-fanout designs. |
| Reset Type | Asynchronous active-low - allows immediate counter clearing independent of clock edge timing. |
| Carry-Out Logic | Active-high, edge-triggered on Q3→Q4 transition - simplifies ripple-cascading to higher bit widths. |
Pinout & Package
74HC4520PW/S400J is housed in a 16-pin Small Outline (SO) package with 1.27 mm pitch, JEDEC MS-012AC compliant, and rated for −40°C to +125°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3, 4, 5, 6, 7, 9 | Counter A I/O and Reset | CLKA, RSTA, QA0–QA3 - dedicated inputs/outputs for first 4-bit counter section. |
| 10, 11, 12, 13, 14, 15, 16, 8 | Counter B I/O and Reset | CLKB, RSTB, QB0–QB3 - independent second 4-bit counter with separate control. |
| 16, 8 | Power & Ground | VCC (pin 16), GND (pin 8) - single-supply rail configuration with decoupling required near pins. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit counters | Enables parallel timing paths-e.g., one counter for pulse width measurement, another for cycle count-without software overhead. |
| Asynchronous reset per section | Allows deterministic initialization of individual counters during runtime, critical for fault-recovery sequences in safety-critical logic. |
| TTL-compatible input thresholds | Ensures interoperability with legacy 74LS and microcontroller GPIOs without level-shifting circuitry. |
| Low dynamic power consumption | Typ. 20 µA ICC at 1 MHz and 5V - reduces heat buildup in thermally constrained industrial enclosures. |
Applications
| Industrial Timer Module | Digital Panel Meter |
|---|---|
Use Scenario: Precise 16-step timing sequence for conveyor belt motor control in packaging machinery. IC Role / Device Role / Timing Role: Dual counter provides synchronized start/stop gating and elapsed time capture with sub-millisecond resolution. Use Value: Eliminates need for microcontroller-based timing, reducing BOM cost and firmware validation burden. | Use Scenario: Scaling and display update logic for 4-digit LED readout driven by analog-to-digital conversion pulses. IC Role / Device Role / Timing Role: First counter accumulates ADC sample counts; second generates display refresh strobes at fixed 50Hz interval. Use Value: Hardware-based timing ensures consistent display update rate independent of processor load or interrupt latency. |
| Programmable Logic Controller (PLC) I/O Expansion | Test Equipment Pulse Generator |
Use Scenario: Adding discrete timing capability to modular PLC backplanes where FPGA resources are constrained. IC Role / Device Role / Timing Role: Provides hardware-decoded timing windows for input debouncing and output hold-off intervals. Use Value: Offloads timing-critical tasks from main controller, improving real-time response predictability. | Use Scenario: Generating calibrated burst patterns (e.g., 10-pulse trains at 1kHz repetition) for sensor excitation testing. IC Role / Device Role / Timing Role: Cascaded counters produce multi-level pulse width and period control using external clock and reset triggers. Use Value: Achieves stable, jitter-free pulse trains without PLL lock time or software loop jitter. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual binary counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| SN74HC4040DR | Single 12-bit ripple counter; no dual-section architecture or independent resets. | Lacks parallel timing capability; unsuitable for simultaneous multi-interval measurement. | Select only when cascaded timing depth >12 bits is required and dual-section independence is unnecessary. |
| 74HC193D | 4-bit up/down counter with synchronous reset; no carry-out on overflow, only TC (terminal count). | Requires external logic for bidirectional control and lacks native dual-section isolation. | Prefer when direction reversal and precise terminal count alignment are needed over dual independent operation. |
Compared with SN74HC4040DR and 74HC193D, the 74HC4520PW/S400J uniquely delivers electrically isolated dual 4-bit up-counters with asynchronous reset per section-enabling concurrent, non-interfering timing tasks in space-constrained industrial logic without added glue logic.
Availability
74HC4520PW/S400J is available at Aetrix Electronics and suitable for industrial timer modules, digital panel meters, and PLC I/O expansion requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for 74HC4520PW/S400J 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 leader focused on secure connectivity solutions for automotive, industrial, and IoT applications.
The 74HC logic family targets robust, low-power, pin-compatible replacements for legacy TTL systems-designed specifically for noise-immune digital control in harsh industrial environments.
FAQ
What is the function of pins 1 and 2 on the 74HC4520PW/S400J?
Pin 1 is CLK_A (clock input for Counter A); pin 2 is RST_A (asynchronous active-low reset for Counter A). Both are CMOS-input compatible with VIH ≥ 3.15V at VCC = 4.5V. These pins operate independently from Counter B's clock and reset, enabling isolated timing control per section.
Can the two counters be cascaded for an 8-bit count?
Yes-carry-out (CO) from Counter A (pin 7) can drive CLK_B (pin 10), creating a ripple-cascaded 8-bit counter. However, propagation delay accumulates across stages, limiting maximum usable frequency to ~12MHz for full 8-bit operation at VCC = 4.5V.
Is the 74HC4520PW/S400J RoHS compliant and halogen-free?
Yes-74HC4520PW/S400J meets RoHS Directive 2011/65/EU and is certified halogen-free per IEC 61249-2-21. The SO-16 package uses matte tin lead finish and green molding compound compliant with NXP's environmental specifications.
Does this device support 3.3V-only operation?
Yes-it operates reliably from 2.0V to 6.0V, including 3.3V nominal supply. At VCC = 3.3V, typical propagation delay increases to 24ns and max clock frequency drops to 18MHz, while maintaining full logic threshold compatibility with 3.3V CMOS interfaces.
74HC4520PW/S400J Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 74HC
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Bulk
- Product Status:
- Active
- Logic Type:
- Binary Counter
- Direction:
- Up
- Number of Elements:
- 2
- Number of Bits per Element:
- 4
- Reset:
- Asynchronous
- Timing:
- Synchronous
- Count Rate:
- 69 MHz
- Trigger Type:
- Positive, Negative
- Voltage - Supply:
- 2 V ~ 6 V
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-TSSOP
74HC4520PW/S400J FAQ
1.How can I place an order for 74HC4520PW/S400J through Aetrix?
Please submit a Request for Quotation (RFQ) for 74HC4520PW/S400J 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 74HC4520PW/S400J reliable?
The price and inventory of 74HC4520PW/S400J are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for 74HC4520PW/S400J is usually 5 days.
3.What payment methods are accepted for 74HC4520PW/S400J?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for 74HC4520PW/S400J transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for 74HC4520PW/S400J?
74HC4520PW/S400J orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your 74HC4520PW/S400J 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 74HC4520PW/S400J?
For technical support, including 74HC4520PW/S400J datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your 74HC4520PW/S400J requirements.
6.How does Aetrix verify that 74HC4520PW/S400J is sourced from the original manufacturer or authorized distributors?
All 74HC4520PW/S400J 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 74HC4520PW/S400J meets industry standards.
7.What is the process for return or replacement of 74HC4520PW/S400J?
All 74HC4520PW/S400J units undergo pre-shipment inspection (PSI). If there is an issue with 74HC4520PW/S400J, 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 74HC4520PW/S400J part is unused and in its original packaging.
Return procedure for 74HC4520PW/S400J:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
74HC4520PW/S400J Tags
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Nexperia USA Inc.
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