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HEF4794B

8-stage shift-and-store register LED driver

Philips Electronics 

Philips Semiconductors

8-stage shift-and-store register LED driver

Product specification

HEF4794B

FUNCTIONAL DESCRIPTION

Table 1 Function table; note 1

INPUTS

PARALLEL SERIAL

OUTPUTS OUTPUTS

CP EO STR D

↑ L XX

↓ L XX

↑HLX

↑ HH L

↑HHH

↓HHH

O0 On OS OS'

Z

Z O6' nc

Z

Z

nc O7

nc nc O6' nc

L On − 1 O6' nc

H On − 1 O6' nc

nc nc nc O7

Note

1. H = HIGH state;

L = LOW state;

X = don’t care;

↑ = positive-going transition;

↓ = negative-going transition;

Z = high-impedance OFF state;

nc = no change;

O6' = the information in the seventh shift register

stage.

a) At the positive clock edge the information in the

7th register stage is transferred to the 8th register

stage and the OS output.

FAMILY DATA

See “Family Specifications” except for: rating for DC

current into any open-drain output is 40 mA.

IDD LIMITS CATEGORY MSI

See “Family Specifications” for ratings.

DC CHARACTERISTICS

VSS = 0 V.

Tamb (°C)

SYMBOL PARAMETER

CONDITIONS

−40

+25

+85

UNIT

MIN. MAX. MIN. MAX. MIN. MAX.

VOL

LOW level output VI = VSS or VDD;

−

0.75 −

0.75 −

1.5 V

voltage

IO < 20 mA; VDD = 5 V

VI = VSS or VDD;

IO < 20 mA;

VDD = 10 V

−

0.75 −

0.75 −

1.5 V

VI = VSS or VDD;

IO < 20 mA;

VDD = 15 V

−

0.75 −

0.75 −

1.5 V

IOZH

HIGH level output VO = 15 V; VDD = 5 V

−

2

−

2

−

15

µA

leakage current; VO = 15 V; VDD = 10 V −

2

−

2

−

15

µA

3-state

VO = 15 V; VDD = 15 V −

2

−

2

−

15

µA

1999 Jun 30

4

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