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CD4028BE

BCD-to-decimal decoder, active-HIGH outputs, CMOS 3-18V, PDIP-16

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制造商零件：

CD4028BE

包装：

PDIP-16 (19.3 x 9.4 x 4.57mm, 2.54mm pitch, through-hole)

品牌：

产品类别：

集成电路 IC, 接口集成电路

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说明

产品概览

The CD4028BE from Texas Instruments is a BCD-to-decimal decoder that converts a 4-bit BCD input to one-of-ten active-HIGH outputs — the CMOS counterpart of the 7442 with inverted output polarity, in a 16-pin PDIP package.

主要规格

功能	BCD-to-decimal decoder (4-line to 10-line)
Technology	CD4000B CMOS
电源电压	3V to 18V
Inputs	A, B, C, D (4-bit BCD)
Outputs	0-9 (active-HIGH, mutually exclusive)
Invalid Input	All outputs LOW for BCD 10-15
传播延迟	150-250ns typical @ VDD=10V
工作温度	-55°C to +125°C
包装	PDIP-16 (19.3 x 9.4mm)

特点

BCD to one-of-ten active-HIGH decoding
All outputs LOW for invalid BCD codes (10-15)
Can also serve as 3-to-8 decoder (D=LOW)
3V-18V wide supply range

应用

BCD display decoding
Decimal output selection
Code validation
Digital meter displays

产品介绍：CD4028BE 产品介绍

The CD4028BE from Texas Instruments is a BCD-to-decimal decoder that converts a 4-bit BCD input into one-of-ten active-HIGH outputs. It is the CMOS equivalent of the TTL 7442, but with an important polarity difference: the CD4028 outputs are active-HIGH (the selected output goes HIGH), while the 7442 outputs are active-LOW (the selected output goes LOW). The active-HIGH outputs make the CD4028 more convenient for directly driving indicators, relay drivers, and high-side switches. For invalid BCD codes (10-15), all outputs remain LOW. As a 3-to-8 decoder: tie D (MSB) to VSS (LOW); A, B, C select one of outputs 0-7 (HIGH); outputs 8-9 are always LOW. The CD4028 can also serve as a 1-of-8 demultiplexer by using the D input as a data input: when D is HIGH, the selected output follows D (HIGH); when D is LOW, all outputs are LOW. The BE suffix denotes the PDIP-16 package.

工作原理：CD4028BE 工作原理

The CD4028BE decodes a 4-bit BCD input (DCBA) into one-of-ten active-HIGH outputs. For BCD values 0-9 (0000-1001), the corresponding output goes HIGH while all other outputs remain LOW. For invalid BCD values 10-15 (1010-1111), all outputs are LOW — no output is active. The decoding logic for each output: Output 0 = D’·C’·B’·A’; Output 1 = D’·C’·B’·A; … Output 9 = D·C’·B’·A. For the 3-to-8 decoder mode: D tied LOW means only outputs 0-7 can be active (D=0 eliminates outputs 8 and 9). The A, B, C inputs select one of the eight outputs. For the demultiplexer mode: D is the data input; when D=1, the selected output is HIGH; when D=0, all outputs are LOW. The selected output follows D. The CD4028’s active-HIGH outputs are the complement of the 7442’s active-LOW outputs — if you need active-LOW, use the 7442 or add inverters to the CD4028 outputs.

引脚说明：CD4028BE 引脚定义和功能

针脚	名称	类型	说明
1	4	输出	Output 4 (active HIGH, for BCD 0100)
2	5	输出	Output 5 (active HIGH, for BCD 0101)
3	6	输出	Output 6 (active HIGH, for BCD 0110)
4	7	输出	Output 7 (active HIGH, for BCD 0111)
5	8	输出	Output 8 (active HIGH, for BCD 1000)
6	9	输出	Output 9 (active HIGH, for BCD 1001)
7	D	输入	BCD input MSB
8	VSS	电源	地面
9	A	输入	BCD input LSB
10	B	输入	BCD input bit 1
11	C	输入	BCD input bit 2
12	3	输出	Output 3 (active HIGH, for BCD 0011)
13	2	输出	Output 2 (active HIGH, for BCD 0010)
14	1	输出	Output 1 (active HIGH, for BCD 0001)
15	0	输出	Output 0 (active HIGH, for BCD 0000)
16	VDD	电源	Supply (3V to 18V)

Application Scenarios:In which products and applications isCD4028BE 中古

Decimal Display: CD4510 BCD counter → D,C,B,A; CD4028 output → transistor driver → 10 individual indicator LEDs
3-to-8 Decoder: D tied to VSS; A,B,C select output 0-7 (HIGH); for 3-line address decoding in CMOS systems
Demultiplexer: D = data input; A,B,C = select; selected output follows D (HIGH when D=1, LOW when D=0); 1-to-8 data routing
Relay Driver: CD4028 output → transistor → relay; 10 relays controlled by 4-bit BCD code; one relay active at a time

Alternative Models:What chips are recommended as replacements for CD4028BE

模型	制造商	主要区别	包装	Supply
CD4028BM	TI	SOIC-16 surface-mount version with identical logic function and 3-18V range	SOIC-16	3-18V
CD4028BE	TI	Through-hole DIP version for prototyping and legacy board repair	DIP-16	3-18V
HEF4028BT	恩智浦	Pin-compatible CMOS version with improved ESD protection and 3-15V supply	SOIC-16	3-15V
MC144028BDR2G	onsemi	Pin-compatible equivalent with RoHS compliance and AEC-Q100 automotive option	SOIC-16	3-18V
74HC42D	TI/Nexperia	HC CMOS version with higher speed and 2-6V supply for modern logic systems	SOIC-16	2-6V
74HC42N	TI/Nexperia	HC CMOS through-hole version for prototyping with 2-6V supply range	DIP-16	2-6V
74HCT42D	Nexperia	HCT version with TTL-compatible inputs for mixed 5V TTL/CMOS systems	SOIC-16	4.5-5.5V

CD4028 is the CMOS 4000-series bcd-to-decimal decoder operating over the wide 3-18V supply range. The HEF4028 (NXP) and MC144028 (onsemi) are direct pin-compatible equivalents. For higher speed at the cost of narrower voltage range, the 74HC42 HC/HCT families offer significantly faster propagation delay and lower power consumption at 2-6V. Surface-mount versions use the BM/M suffix (SOIC); through-hole versions use the BE suffix (DIP).

CD4028BE

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