HCF4028M013TR データシートの表示（PDF） - STMicroelectronics

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HCF4028M013TR

BCD TO DECIMAL DECODER

STMicroelectronics 

TEST CIRCUIT

HCF4028B

CL = 50pF or equivalent (includes jig and probe capacitance)

RL = 200KΩ

RT = ZOUT of pulse generator (typically 50Ω)

WAVEFORM : PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)

TYPICAL APPLICATION

The circuit shown in fig. 1 converts any 4-bit code

to a decimal or hexadecimal code. Fig. 2 shows a

number of codes and the decimal or hexadecimal

number in these codes, which must be applied to

the input pins of HCF4028B to select a particular

output. For example: in order to get a "high" on

output 8 the input must be either an 8 expressed in

4-bit binary code or a 15 expressed in

excess-3code.

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