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Nexperia USA Inc. HEF4520BT,652
- Part No.:
- HEF4520BT,652
- Manufacturer:
- Nexperia USA Inc.
- Category:
- Counters, Dividers
- Package:
- 16-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
HEF4520BT,652.pdf
- Description:
- IC BINARY COUNTER DL 4BIT 16SO
- Quantity:
- Payment:
- Shipping:
Inventory:2,707
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Product details
Overview
HEF4520BT,652 from Nexperia is a dual 4-bit internally synchronous binary counter IC with two independent clock inputs (1CP0/1CP1 and 2CP0/2CP1), asynchronous master reset (1MR/2MR), and buffered outputs (1Q0–1Q3 and 2Q0–2Q3). It operates across 3.0 V to 15.0 V supply, supports dual-edge clocking (LOW-to-HIGH on CP0 when CP1 HIGH, HIGH-to-LOW on CP1 when CP0 LOW), and delivers stable counting in industrial timing and control logic circuits.
For engineers reviewing the HEF4520BT,652 datasheet, HEF4520BT,652 pinout, HEF4520BT,652 application, or HEF4520BT,652 equivalent, this device is selected for precise dual-channel binary division, clock enable gating, and reset-synchronized state management in legacy CMOS systems requiring wide-voltage tolerance and high noise immunity.
Technical Context
The HEF4520BT,652 implements two independent 4-bit synchronous binary counters sharing no internal signal paths - each with dedicated clock pair (CP0/CP1) and master reset (MR). Count advancement is edge-triggered asymmetrically: one input responds to rising edge, the other to falling edge, enabling flexible clock-enable or dual-clock domain interfacing.
Its static CMOS architecture ensures zero static current draw at steady state, while input clamp diodes allow safe interfacing to voltages exceeding VDD via external current-limiting resistors. Operation is fully specified from −40 °C to +85 °C with JEDEC JESD13-B compliance and HBM ESD rating >2000 V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Supply voltage range | 3.0 V to 15.0 V - enables direct use in 5 V, 10 V, and 15 V logic systems without level-shifting. |
| Count depth per channel | 4-bit binary (0–15) - provides divide-by-16 capability per counter with synchronous internal carry propagation. |
| Max clock frequency | 40 MHz at VDD = 15 V - supports high-speed timing generation in non-critical digital control loops. |
| Propagation delay (tPHL/tPLH) | 25 ns typical at VDD = 15 V, CL = 50 pF - ensures predictable setup/hold timing for downstream logic stages. |
| Input transition tolerance | Valid for slow edges: Δt/ΔV down to 0.08 μs/V at 15 V - eliminates need for Schmitt-trigger input conditioning. |
| Output drive strength | IOL = 3.6 mA / IOH = −3.6 mA at VDD = 15 V - directly drives multiple 74HC/4000-series inputs or small LED loads. |
| Operating temperature | −40 °C to +85 °C - qualified for industrial-grade embedded controllers and power-supply sequencers. |
Pinout & Package
HEF4520BT,652 is housed in a plastic SO16 (SOT109-1) package: 16-pin small outline, 3.9 mm body width, gull-wing leads, surface-mount compatible.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 9 (1CP0, 2CP0) | Channel 1 & 2 clock input A | Rising-edge triggered; active only when corresponding CP1 is HIGH - used as primary clock or enable-controlled clock. |
| 2, 10 (1CP1, 2CP1) | Channel 1 & 2 clock input B | Falling-edge triggered; active only when corresponding CP0 is LOW - enables inverted clock gating or dual-phase synchronization. |
| 3–6, 11–14 (1Q0–1Q3, 2Q0–2Q3) | Counter output bits | Buffered complementary CMOS outputs; Q0 = LSB, Q3 = MSB; support fan-out ≥10 74HC loads. |
| 7, 15 (1MR, 2MR) | Asynchronous master reset | Active-HIGH reset; forces all four outputs LOW regardless of clock state - critical for deterministic power-up or fault recovery. |
| 8 (VSS) | Ground reference | Primary 0 V return; must be low-impedance connection to minimize ground bounce in multi-counter systems. |
| 16 (VDD) | Positive supply | Single rail powers both counters; decoupling capacitor (100 nF) required within 5 mm of pin for stable operation. |
Key Features
| Feature | Design Value |
|---|---|
| Dual independent 4-bit counters | Enables simultaneous divide-by-16 operations on separate clock domains without inter-channel coupling or shared carry logic. |
| Asymmetric dual-edge clocking | Eliminates need for external inverters when implementing clock enable: CP0 serves as clock, CP1 as enable (or vice versa). |
| Wide 3–15 V supply range | Reduces BOM count by supporting mixed-voltage designs - e.g., 5 V microcontroller interface with 12 V analog subsystem timing. |
| Clamp diode-equipped inputs | Permits direct connection to 24 V sensors or industrial I/O with series current-limiting resistors - no external protection needed. |
| High noise immunity | VIH = 11.0 V / VIL = 4.0 V at VDD = 15 V - rejects >3 V of common-mode noise on clock/reset lines in electrically noisy environments. |
Applications
| Industrial PLC Timing Modules | Legacy Instrumentation Counters |
|---|---|
|
Use Scenario: Generating precise 1 Hz, 10 Hz, and 100 Hz timing references from a 1.6384 MHz crystal oscillator in programmable logic controller scan cycles. IC Role / Device Role / Timing Role: Dual-channel binary divider - first counter divides by 256 (8 bits), second by 64 (6 bits), cascaded to achieve exact sub-harmonics. Use Value: Eliminates need for external prescalers or FPGA logic; deterministic reset ensures cycle alignment after power-on or watchdog timeout. |
Use Scenario: Implementing front-panel event counters in benchtop multimeters and oscilloscopes with manual reset and decimal scaling. IC Role / Device Role / Timing Role: Synchronous event accumulator - CP0 driven by front-end comparator output, MR tied to pushbutton switch with debounce RC network. Use Value: Buffered Q0–Q3 outputs drive 7-segment decoder ICs directly; wide VDD range allows same design to run from ±15 V analog rails or +5 V digital supply. |
| Power Supply Sequencing Controllers | Test Equipment Pulse Generators |
|
Use Scenario: Controlling startup order and delay intervals for multi-rail DC/DC converters in telecom base station power modules. IC Role / Device Role / Timing Role: Cascaded delay generator - outputs feed monostable multivibrators that trigger MOSFET gate drivers for each rail. Use Value: Asynchronous MR allows global reset during fault conditions; slow-edge tolerance accommodates RC-generated clocks without added buffers. |
Use Scenario: Building variable-duty-cycle pulse trains in automated test equipment using potentiometer-adjusted RC networks. IC Role / Device Role / Timing Role: Programmable divider core - CP0 driven by fixed-frequency oscillator, CP1 modulated by analog voltage via comparator to vary effective division ratio. Use Value: Dual-edge triggering enables real-time duty-cycle adjustment without interrupting counting; clamp diodes protect against op-amp saturation overshoot. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar dual binary counter applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| CD4020BE | Single 14-bit ripple counter; no dual channels, no dual-edge clocking, no buffered outputs. | Requires external logic to emulate dual 4-bit function; higher propagation delay accumulation across stages. | Select only if board space is constrained and 14-bit single-chain division suffices without reset isolation between channels. |
| 74HC4060 | 14-bit binary counter with integrated oscillator; no dual independent counters; CP input is single-edge only. | Lacks separate MR per channel and asymmetric clock enable; oscillator section adds complexity for pure counting use cases. | Choose only when on-chip RC oscillator simplifies BOM and system clock source is not pre-existing. |
Compared with CD4020BE and 74HC4060, the HEF4520BT,652 uniquely delivers two isolated 4-bit synchronous counters with asymmetric edge-triggered clock inputs and true asynchronous per-channel reset - essential for deterministic multi-domain timing where channel independence and reset integrity are non-negotiable.
Availability
HEF4520BT,652 is available at Aetrix Electronics and suitable for industrial PLC timing modules, legacy instrumentation counters, power supply sequencing controllers, and test equipment pulse generators requiring stable component supply across extended temperature and voltage ranges.
Supply support for HEF4520BT,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
Nexperia is a global semiconductor expert specializing in high-volume, high-reliability logic, discrete, and power MOSFET solutions, with manufacturing rooted in process excellence and automotive-grade quality systems.
The HEF4520BT,652 belongs to Nexperia's legacy CMOS logic family designed for industrial and instrumentation applications demanding wide supply range, robust ESD performance, and long-term obsolescence resilience - not optimized for ultra-low-power or high-speed serial interfaces.
FAQ
What clock edge combinations advance the counter?
The HEF4520BT,652 advances on either the LOW-to-HIGH transition of CP0 when CP1 is HIGH, or the HIGH-to-LOW transition of CP1 when CP0 is LOW. Both conditions cannot be simultaneously true - the counter ignores transitions where both clocks are active or inactive together. This asymmetry enables clean clock-gating without race conditions.
Can HEF4520BT,652 operate reliably at 3.3 V?
Yes - the device is fully specified down to 3.0 V supply voltage. At 3.3 V, VIH is guaranteed ≥2.31 V and VIL ≤1.1 V, ensuring compatibility with standard 3.3 V CMOS logic families. Propagation delay increases to ~150 ns (typical), but functionality remains intact across the full −40 °C to +85 °C range.
Is there internal carry propagation between the two counters?
No - the HEF4520BT,652 contains two completely independent 4-bit synchronous counters with no internal carry path. Each has its own CP0, CP1, MR, and Q0–Q3 outputs. Inter-counter carry must be implemented externally using Q3 outputs and logic gates if an 8-bit chain is required.
How does the input clamp diode affect interfacing with 24 V signals?
The built-in clamp diodes allow safe connection of 24 V signals to CP or MR pins when paired with a series current-limiting resistor. For example, a 10 kΩ resistor limits input current to <2.4 mA at 24 V, staying well below the ±10 mA absolute maximum clamping current - eliminating need for external TVS or Zener protection.
HEF4520BT,652 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Nexperia USA Inc.
- Series:
- 4000B
- 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:
- -
- Count Rate:
- 40 MHz
- Trigger Type:
- Positive, Negative
- Voltage - Supply:
- 4.5 V ~ 15.5 V
- Operating Temperature:
- -40°C ~ 85°C
- Grade:
- -
- Qualification:
- -
- Mounting Type:
- Surface Mount
- Supplier Device Package:
- 16-SO
HEF4520BT,652 FAQ
1.How can I place an order for HEF4520BT,652 through Aetrix?
Please submit a Request for Quotation (RFQ) for HEF4520BT,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 HEF4520BT,652 reliable?
The price and inventory of HEF4520BT,652 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for HEF4520BT,652 is usually 5 days.
3.What payment methods are accepted for HEF4520BT,652?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for HEF4520BT,652 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for HEF4520BT,652?
HEF4520BT,652 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your HEF4520BT,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 HEF4520BT,652?
For technical support, including HEF4520BT,652 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your HEF4520BT,652 requirements.
6.How does Aetrix verify that HEF4520BT,652 is sourced from the original manufacturer or authorized distributors?
All HEF4520BT,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 HEF4520BT,652 meets industry standards.
7.What is the process for return or replacement of HEF4520BT,652?
All HEF4520BT,652 units undergo pre-shipment inspection (PSI). If there is an issue with HEF4520BT,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 HEF4520BT,652 part is unused and in its original packaging.
Return procedure for HEF4520BT,652:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
HEF4520BT,652 Tags
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