CD4520BF Texas Instruments Integrated Circuit (Ceramic Dual-In-Line Packages) In Stock
Texas Instruments CD4520BF is a dual 4-bit binary up-counter from the CMOS 4000 series, featuring gated clock inputs with Schmitt trigger for noise-immune counting from 3 V to 18 V supply. Housed in a 16-pin ceramic DIP package, it suits industrial and military timing circuits. From $1.20 in stock with worldwide shipping.
- Manufacturer
- Texas Instruments
- Package
- Ceramic Dual-In-Line Packages
- Pin Count
- 16
- Lifecycle
- ACTIVE
- Datasheet
- CD4520BF 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 binary up-counter channels enabling simultaneous counting of two signals in a single 16-pin CMOS package
- Schmitt trigger on clock input providing noise immunity on slow or noisy clock edges in industrial and automotive counting applications from 3 V to 18 V
- Wide supply voltage range of 3 V to 18 V and ceramic DIP package supporting operation from -55°C to +125°C in military and industrial environments
Applications
CD4520BF is used in event counting, frequency division, and timing chain circuits in industrial control panels and test instrumentation operating from 5 V to 15 V supplies. Its dual 4-bit channels with gated clocks allow cascading to 8-bit or longer counters in temperature controllers, position encoders, and pulse-count metering systems. The ceramic DIP package and wide temperature range make it suitable for military avionics and harsh-environment data acquisition modules.
Specifications
| Pbfree Code | Yes |
| YTEOL | 15 |
| Additional Feature | GATED CLOCK; SCHMITT TRIGGER ON CLOCK INPUT |
| Count Direction | UP |
| Family | 4000/14000/40000 |
| JESD-30 Code | R-GDIP-T16 |
| JESD-609 Code | e0 |
| Load Capacitance (CL) | 50pF |
| Load/Preset Input | NO |
| Logic IC Type | BINARY COUNTER |
| Max Frequency@Nom-Sup | 1500000Hz |
| Max I(ol) | 0.0015A |
| Mode of Operation | SYNCHRONOUS |
| Number of Bits | 4 |
| Number of Functions | 2 |
| Package Body Material | CERAMIC, GLASS-SEALED |
| Package Equivalence Code | DIP16,.3 |
| Package Shape | RECTANGULAR |
| Package Style | IN-LINE |
| Packing Method | TUBE |
| Power Supply Current-Max (ICC) | 0.03mA |
| Prop. Delay@Nom-Sup | 230ns |
| Propagation Delay (tpd) | 560ns |
| Qualification Status | Not Qualified |
| Supply Voltage-Max (Vsup) | 18V |
| Supply Voltage-Min (Vsup) | 3V |
| Supply Voltage-Nom (Vsup) | 5V |
| Surface Mount | NO |
| Technology | CMOS |
| Temperature Grade | MILITARY |
| Terminal Finish | Tin/Lead (Sn/Pb) |
| Terminal Form | THROUGH-HOLE |
| Terminal Pitch | 2.54mm |
| Terminal Position | DUAL |
| Trigger Type | POSITIVE EDGE |
| fmax-Min | 4MHz |
| Package | Ceramic Dual-In-Line Packages |
Compliance & Regulatory
| RoHS Status | Compliant |
| Lead-Free | Yes (Pb-Free) |
| ECCN | EAR99 |
| HTS Code | 8542.39.00.90 |
Alternate & Equivalent Parts
Compatible alternatives and drop-in replacements for CD4520BF:
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
What supply voltage range and temperature range does CD4520BF support for industrial and military designs?
CD4520BF operates from 3 V to 18 V supply and is specified for the full military temperature range of -55°C to +125°C. The ceramic DIP package provides hermetic sealing, making it reliable in harsh industrial and avionics environments where standard plastic packages would fail due to moisture ingress or thermal cycling.
How does the Schmitt trigger clock input of CD4520BF improve counting reliability on slow or noisy clock signals?
The Schmitt trigger on CD4520BF's clock input provides hysteresis of approximately 1 V at 5 V supply and up to 2.5 V at 15 V supply, preventing multiple counts from a single slow edge or noise spike. This makes it suitable for counting mechanical switch closures, sensor pulses, and industrial relay outputs where signal edges may have rise times exceeding 1 µs.
How can two CD4520BF channels be cascaded to implement a divide-by-256 frequency divider?
Each 4-bit counter channel divides the clock by 16. Connecting the carry output (Q4) of channel 1 as the clock input of channel 2 creates an 8-bit ripple counter dividing by 256. At a 1 MHz input clock, the output of the second stage produces a 3.906 kHz divided frequency, useful for generating low-frequency timing references from crystal oscillator inputs in industrial timers.
For a new PCB design, when is CD4520BF in ceramic DIP preferred over an equivalent CMOS counter in plastic SMT package?
CD4520BF in ceramic DIP is preferred when the design must meet MIL-STD-883 qualification, operate at temperatures above 85°C (up to 125°C), or survive humidity environments above 85% RH where plastic packages absorb moisture. Military avionics, oil-well logging electronics, and space-heritage industrial designs specify ceramic DIP for these reasons despite the larger 16-pin through-hole footprint.
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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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