HEF4894B datasheet(8/19 Pages) NXP

Part #	HEF4894B

Description	12-stage shift-and-store register LED driver

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HEF4894B

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Product data sheet

Rev. 7 — 13 August 2010

8 of 19

NXP Semiconductors

HEF4894B

12-stage shift-and-store register LED driver

[1]

The typical values of the propagation delay and transition times are calculated from the extrapolation formulas shown (CL in pF).

[2]

ten is the same as tPZL and tdis is the same as tPLZ.

[3]

tt is the same as tTLH and tTHL.

ten

OE to QPn;

see Figure 8

5V

[2]

-100

200

ns

10 V

-

55

110

ns

15 V

-

50

100

ns

tdis

OE to QPn;

see Figure 8

5V

[2]

-

80

160

ns

10 V

-

40

80

ns

15 V

-

30

60

ns

tt

transition time

QS1, QS2;

see Figure 6

5V

[1][3]

35 ns + (1.00 ns/pF)CL

-

85

170

ns

10 V

19 ns + (0.42 ns/pF)CL

-40

80

ns

15 V

16 ns + (0.28 ns/pF)CL

-30

60

ns

tW

pulse width

CP; LOW and HIGH;

see Figure 6

5V

60

30

-

ns

10 V

30

15

-

ns

15 V

24

12

-

ns

STR; HIGH;

see Figure 7

5V

80

40

-

ns

10 V

60

30

-

ns

15 V

24

12

-

ns

tsu

set-up time

D to CP;

see Figure 9

5V

60

30

-

ns

10 V

20

10

-

ns

15 V

15

5

-

ns

th

hold time

D to CP;

see Figure 9

5V

+5

−15

-

ns

10 V

20

5

-

ns

15 V

20

5

-

ns

fclk(max)

maximum clock

frequency

CP; see Figure 6

5V

5

10

-

MHz

10 V

11

22

-

MHz

15 V

14

28

-

MHz

Table 7.

Dynamic characteristics …continued

VSS = 0 V; Tamb = 25 °C unless otherwise specified. For test circuit see Figure 10.

Symbol Parameter

Conditions

VDD

Extrapolation formula

Min

Typ

Max

Unit

Table 8.

Dynamic power dissipation

PD can be calculated from the formulas shown. VSS = 0 V; tr = tf ≤ 20 ns; Tamb = 25 °C.

Symbol Parameter

VDD

Typical formula

Where

PD

dynamic power

dissipation

5V

PD = 1200 × fi + Σ(fo × CL) × VDD2 μWfi = input frequency in MHz;

fo = output frequency in MHz;

CL = output load capacitance in pF;

Σ(f

o × CL) = sum of the outputs;

VDD = supply voltage in V.

10 V

PD = 5550 × fi + Σ(fo × CL) × VDD2 μW

15 V

PD = 15000 × fi + Σ(fo × CL) × VDD2 μW

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