The HEF4521B consists of a chain of 24 toggle flip-flops with an overriding asynchronous master reset input (MR), and an input circuit that allows three modes of operation. The single inverting stage (A2 to Y2) functions as: a crystal oscillator, an input buffer for an external oscillator or in combination with A1 as an RC oscillator. The crystal oscillator operates in Low-power mode when pins VSS1 and VDD1 are supplied via external resistors.
Each flip-flop divides the frequency of the previous flip-flop by two, consequently the HEF4521B counts up to 224 = 16777216. The counting advances on the HIGH-to-LOW transition of the clock (A2). The outputs from each of the last seven stages (218 to 224) are available for additional flexibility.
It operates over a recommended VDD power supply range of 3 V to 15 V referenced to VSS (usually ground). Unused inputs must be connected to VDD, VSS, or another input.
Features and benefits
Binary Counter, 4000/14000/40000 Series, Asynchronous, Negative Edge Triggered, 24-Bit, Up Direction, CMOS, PDSO16
Counter IC Divide-by-2 1 Element 24 Bit Negative Edge 16-SO
IC DIVIDER BY 2 24-BIT 16SO
IC DIVIDER BY 2 24-BIT 16SO
Manufacturer: Nexperia USA Inc.
Win Source Part Number: 1043140-HEF4521BT,65
Packaging: Reel - TR
Mounting: SMD (SMT)
Logic Type: Divide-by-2
Number of Elements: 1
Number of Bits per Element: 24
Trigger Type: Negative Edge
Reset: Asynchronous
Count Rate: 35MHz
Categories: Integrated Circuits
Status: Active
Temperature Range - Operating: -40°C to 85°C
Dimension: 16-SOIC (0.154", 3.90mm Width)
Supply Voltage - Operating: 3 V to 15 V
Popularity: Medium
Fake Threat In the Open Market: 59 pct.
Supply and Demand Status: Balance
IC DIVIDER BY 2 24-BIT 16SO
Counter IC Divide-by-2 1 Element 24 Bit Negative Edge 16-SO
IC FREQ DIVIDER 24STG 16SOIC
| Nexperia B.V. | Rochester Electronics | DigiKey | Win Source Electronics | Shenzhen Shengyu Electronics Technology Limited | Quarktwin Technology Ltd. | Lingto Electronic Limited | |
|---|---|---|---|---|---|---|---|
| Product Category | Logic Dividers | Logic Counters | Logic Dividers | Logic Counters | Logic Dividers | Logic Dividers | Logic Dividers |
| Product Number | HEF4521BT,653 | HEF4521BT,653 | 1727-HEF4521BT,653TR-ND | 1043140-HEF4521BT,653 | HEF4521BT,653 | HEF4521BT,653 | HEF4521BT,653 |
| Product Name | 24-stage frequency divider and oscillator | Counters, Dividers | Logic - Logic - Counters, Dividers - HEF4521BT,653 | Integrated Circuits (ICs) - Logic - Counters, Dividers | Counters, Dividers | Logic - Counters, Dividers | |
| Features | ESD Protection | ||||||
| Operating Temperature | -40 to 85 C (-40 to 185 F) | -40 to 85 C (-40 to 185 F) | -40 to 85 C (-40 to 185 F) | -40 to 85 C (-40 to 185 F) | -40 to 85 C (-40 to 185 F) | ||
| Supply Voltage | 3.0 - 15 | 3 V ~ 15 V | 1.5V; 3 V ~ 15 V | ||||
| Package Type | SOT109-1 | SOT109 | SOIC; "16-SOIC (0.154"", 3.90mm Width)" | SOIC | SOIC; 16-SOIC (0.154\", 3.90mm Width) | ||
| Logic Family | CMOS; CMOS | CMOS |
