HCF4054B_02 datasheet(2/11 Pages) STMICROELECTRONICS

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HCF4054B

2/11

IINPUT EQUIVALENT CIRCUIT

PIN DESCRIPTION

TRUTH TABLE

X = Don’t Care.

(*) Depends upon the input mode previously applied when ST=1.

PIN No

SYMBOL

NAME AND FUNCTION

6, 5, 4, 3

OUT1 to

OUT4

Outputs

9, 11, 13, 15

IN1 to IN4

Inputs

10, 12, 14, 1

STROBE1

STROBE4

Strobe Input

DISPLAY

FREQ. IN

Display Frequency Input

VEE

Negative Supply Voltage

VSS

Negative Supply Voltage

VDD

Positive Supply Voltage

STROBE

OUT

HLH

HHH

can be converted to output signal swings (VDD to

VEE) of +5V to -5V. The level shifted function

permits the use of different input and output signal

swings. The input swings from a low level of VSS

to a high level of VDD, while the outputs swings

from a low level of VEE to the same high level of

VDD . Thus, the input and output swings can be

selected independently of each other over a 3 to

18V range. VSS may be connected to VEE when

level-shift

function

required.

Data

transferred from input to output by placing a high

voltage level at the strobe input. A low voltage

level at the strobe input latches the data input and

the

corresponding

output

segments

remain

selected (or non selected) while the strobe is low.

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