CD4520BMN Texas Instruments Integrated Circuit (Dual-In-Line Packages) In Stock
Texas Instruments CD4520BMN is a dual synchronous 4-bit binary up counter from the CMOS 4000 family with gated clock inputs and Schmitt trigger clock conditioning for noise immunity. Each counter section provides synchronous parallel counting with load/preset capability and drives a 50 pF load in a 16-pin DIP package. Available from stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- OBSOLETE
- Datasheet
- CD4520BMN Datasheet PDF
- Category
- Integrated Circuit
- Temp Range
- -55.0°C to 125.0°C
- RoHS
- Compliant
- Lead Time
- 3–7 business days
- Shipping
- DHL Express · Worldwide
Key Features
- Dual independent 4-bit synchronous up counters allowing cascade to 8-bit or wider count ranges with a single device
- Schmitt trigger clock input providing hysteresis that suppresses slow-edge or noisy clock glitches for robust counting
- Gated clock enable and load/preset inputs giving flexible counter control in frequency-divider and timer circuits
Applications
The CD4520BMN is used in frequency division, event counting, and timer circuits in industrial control, consumer electronics, and educational laboratory applications where CMOS logic level compatibility across 3 V to 15 V supplies is required. Its dual-counter architecture enables cascaded 8-bit counting or two independent timing channels in a single 16-pin DIP package, making it a cost-effective choice for clock dividers, decade counters, and multi-channel pulse-width control circuits.
Specifications
| Reach Compliance Code | Unknown |
| YTEOL | 0 |
| Additional Feature | GATED CLOCK; SCHMITT TRIGGER ON CLOCK INPUT |
| Count Direction | UP |
| Family | 4000/14000/40000 |
| JESD-30 Code | R-PDIP-T16 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | YES |
| Logic IC Type | BINARY COUNTER |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Package Body Material | PLASTIC/EPOXY |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Propagation Delay (tpd) | 650ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 15V |
| Supply Voltage-Min (Vsup) | 3V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 1.5MHz |
| Package | Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| HTS Code | 8542.39.00.60 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD4520BMN:
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDSO16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, CDIP16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDIP16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, CDIP16
Binary Counter, 4000/14000/40000 Series, Synchronous, Positive Edge Triggered, 4-Bit, Up Direction, CMOS, PDIP16
Frequently Asked Questions
How can two CD4520BMN sections be cascaded to form an 8-bit counter for a wider counting range?
Each of the 2 independent 4-bit counters in the CD4520BMN has a carry output (CO) that goes high when the counter reaches its maximum count of 15 (binary 1111). Connecting the CO of the first counter to the clock enable input of the second creates a ripple-free synchronous 8-bit chain counting from 0 to 255, suitable for generating timing intervals up to 256 clock cycles in frequency-divider and event-count applications.
What advantage does the Schmitt trigger clock input of the CD4520BMN provide in electrically noisy environments?
The Schmitt trigger on the clock input provides approximately 0.5 V to 1.5 V of hysteresis (depending on supply voltage), preventing false triggering from slow edges or high-frequency noise superimposed on the clock line. In industrial environments with relay switching transients or motor-drive interference, this hysteresis ensures the counter increments exactly once per intended clock edge even when the signal rise time exceeds 1 µs.
Over what supply voltage range does the CD4520BMN operate, and how does that affect interfacing to both 5 V TTL and 12 V CMOS systems?
The CD4520BMN CMOS 4000-family device operates from 3 V to 15 V VDD. At 5 V it is directly compatible with LSTTL logic when the TTL outputs are pulled up to 5 V; at 10 V to 12 V it interfaces with industrial CMOS systems and mechanical relay drivers without a level-translation stage. Propagation delay decreases from approximately 200 ns at 5 V to about 60 ns at 10 V, so higher supply voltages improve counting speed.
For a frequency divider application, what is the maximum input clock frequency the CD4520BMN can reliably count?
At a 10 V supply the CD4520BMN maximum clock frequency is typically 8 MHz, while at 5 V it drops to approximately 3 MHz due to the slower CMOS switching at lower VDD. A divide-by-16 counter using both 4-bit sections at 10 V produces an output frequency up to 500 kHz, which covers audio-band clock dividers, CNC stepper motor pulse generators, and industrial process timing circuits.
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About Texas Instruments
Texas Instruments (TI) is a global semiconductor company headquartered in Dallas, Texas. TI designs and manufactures analog and embedded processing chips used in industrial, automotive, consumer, communications, and enterprise systems.
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