Nexperia

HEF4794B

8-stage shift-and-store register LED driver

6. Functional description

Table 3. Function table

H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state;

↑ = LOW-to-HIGH clock transition; ↓ = HIGH-to-LOW clock transition.

Input

Parallel output

Serial output

CP

OE

STR

D

QP0

QPn

QS1[1]

QS2[2]

↑

L

X

X

Z

Z

Q6S

no change

↓

L

X

X

Z

Z

n.c.

Q7S

↑

H

L

X

no change

no change

Q6S

no change

↑

H

H

L

Z

QPn - 1

Q6S

no change

↑

H

H

H

L

QPn - 1

Q6S

no change

↓

H

H

H

no change

no change

no change

Q7S

[1] Q6S = the data in register stage 6 before the LOW to HIGH clock transition.

[2] Q7S = the data in register stage 7 before the HIGH to LOW clock transition.

001aag801

clock input

data input

strobe input

output enable

input

internal Q0S

(FF0)

QP0 output

internal Q6S

(FF6)

QP6 output

serial QS1

output

serial QS2

output

Z-state

Z-state

Fig. 5. Timing diagram

HEF4794B

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Product data sheet

Rev. 10 — 6 January 2022

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