Nexperia

HEF4794B

8-stage shift-and-store register LED driver

001aag804

DUT

VEXT

RT

CL

RL

tr

10 %

90 %

tf

VI

VI

VO

VDD

VSS

input pulse

G

Test data is given in Table 10.

Definitions for test circuit:

DUT - Device Under Test.

RL = Load resistance.

CL = load capacitance.

RT = Termination resistance should be equal to output impedance of Zo of the pulse generator.

VEXT = External voltage for measuring switching times.

Fig. 10. Test circuit for measuring switching times

Table 10. Test data

Supply

Input

VEXT

Load

VDD

VI

tr, tf

tPLZ, tPZL

tPLH, tPHL

CL

RL

5 V to 15 V

VDD

≤ 20 ns

VDD

open

50 pF

1 kΩ

11. Application information

001aag806

QP0

D

S2

PWM

dimmer input

OE

STR

data

from remote

control panel

clock

CP

CONTROL

AND

SYNC

CIRCUITRY

QP7

HEF4794B

QP0

D

S2

VDD

VDD

OE

STR

CP

QP7

HEF4794B

Fig. 11. Application example: serial-to-parallel data converting LED drivers

HEF4794B

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Product data sheet

Rev. 10 — 6 January 2022

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