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CD4021BE

8-bit CMOS shift register, parallel load, 3-18V, PDIP-16

5000

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Pieza del fabricante：

CD4021BE

Paquete：

16-pin PDIP (19.3 x 6.35 x 5.08 mm, through-hole)

Marca：

Categorías de productos：

Circuitos integrados IC, Circuitos integrados de vídeo

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Descripción

Productos

The CD4021BE is a CMOS 8-stage static shift register with asynchronous parallel load, 3V-18V supply, and 8.5MHz max clock in 16-pin DIP through-hole package.

Especificaciones

Configuración	8-bit universal shift register
Technology	CD4000 CMOS
Number of Bits	8
Tensión de alimentación	3 V to 18 V
Max Clock Frequency	8.5 MHz @ 10V
Output Drive Current	4.2 mA sink/source @ 5V
Supply Current (max)	3 mA @ 15V
Input Type	Standard CMOS
Output Type	Push-Pull
Parallel Load	Asynchronous (active high PE)
Serial Output	Q6, Q7, Q8 available
Paquete	16-pin PDIP (BE suffix)
Temperatura de funcionamiento	-55 to +125 C

Características

8-stage static shift register with parallel load capability
Asynchronous parallel load overrides serial shift
3V to 18V wide supply voltage range
Three serial outputs: Q6, Q7, Q8 for cascading flexibility
CD4000 CMOS family for industrial robustness

Aplicaciones

Parallel-to-serial data conversion
Input expansion for microcontroller systems
Key scanning and switch matrix reading
Delayed data output using multiple tap points
General-purpose logic and shift register functions

Introducción del producto:CD4021BE Presentación del producto

The CD4021BE is a CMOS 8-stage static shift register with asynchronous parallel load in 16-pin PDIP package. The device operates from 3V to 18V supply and features both serial-in/serial-out shift capability and 8-bit parallel load via the parallel enable (PE) input. When PE is high, the 8 parallel inputs (P1-P8) are asynchronously loaded into the register, overriding the serial shift data. When PE is low, data shifts from the serial input (SI) through the 8 stages on each rising clock edge. Three serial outputs (Q6, Q7, Q8) provide access to different tap points for cascading flexibility. The BE suffix denotes 16-pin plastic DIP package with extended temperature range.

Principio de funcionamiento:CD4021BE Principio de funcionamiento

The CD4021BE operates as an 8-bit static shift register with parallel load. (1) In serial shift mode (PE = low), data present at the serial input (SI) is shifted into the first stage on each rising clock edge. The data in each stage shifts one position to the right, and the Q8 output reflects the data shifted out of the last stage. This mode is used for serial-in/serial-out and serial-in/parallel-out data transfer. The Q6 and Q7 outputs provide intermediate tap points for applications requiring shorter delay or cascading at intermediate positions. (2) In parallel load mode (PE = high), the 8 parallel inputs (P1-P8) are asynchronously loaded into the register regardless of the clock state. This overrides any serial data and immediately updates all 8 register stages. This mode is essential for parallel-to-serial conversion: first load 8 bits in parallel, then shift them out serially at Q8. (3) The asynchronous nature of the parallel load means it takes priority over the clock. When PE goes high, the parallel data is loaded immediately without waiting for a clock edge. When PE returns low, the device resumes serial shifting from the loaded state. This makes the CD4021BE ideal for reading parallel data (such as switch matrices or keyboard inputs) and converting it to serial for transmission to a microcontroller via a single data line.

Descripción de la clavija:CD4021BE Definición y funciones de las clavijas

Pin	Nombre	Función
1	P6	Parallel input 6
2	P7	Parallel input 7
3	P8	Parallel input 8
4	Q6	Serial output (stage 6)
5	Q7	Serial output (stage 7)
6	Q8	Serial output (stage 8)
7	CLK	Clock (rising edge shifts)
8	VSS	Suelo
9	SI	Entrada de datos serie
10	PE	Parallel Enable (active high)
11	P1	Parallel input 1
12	P2	Parallel input 2
13	P3	Parallel input 3
14	P4	Parallel input 4
15	P5	Parallel input 5
16	VDD	Positive supply (3-18V)

Application Scenarios:In which products and applications isCD4021BE usado

Parallel-to-serial data conversion for MCU input expansion
Key scanning and switch matrix reading via parallel load
Delayed data output using Q6/Q7/Q8 tap points
General-purpose logic and shift register functions at 3-18V
Industrial control systems requiring wide voltage range

Alternative Models:What chips are recommended as replacements for CD4021BE

Modelo	Fabricante	Diferencia clave
CD4014BE	TI	Synchronous parallel load (vs async)
74HC165D	Nexperia	8-bit, 2-6V, async load, SO-16
74HC589D	Nexperia	8-bit, output latch, SO-16
CD4094BE	TI	8-bit serial-in/parallel-out
74LV165APW	Nexperia	8-bit, 1.2-5.5V, TSSOP-16