1178

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CD4511BMS

FIGURE 9. DRIVING COMMON CATHODE 7-SEGMENT LED DISPLAYS (EXAMPLE HEWLET-PACKARD 5082-7740)

FIGURE 10. DRIVING LOW VOLTAGE FLOURESCENT DISPLAYS

FIGURE 11. DRIVING INCANDESCENT DISPLAYS (RCA NU-

MITRON DR2000 SERIES DISPLAYS)

ISEG

VDD

+

VSS

VOH

-

R

a

R

b

R

c

R

d

R

e

R

f

R

g

+

VDF

-

VDD

VSS

LATCH

8

DECODER

VDD

LT

LED 7-SEGMENT

DISPLAY

A

B

C

D

LE

BL

TO VDD

BCD

INPUTS

CD4511BMS

DUTY CYCLE = 100%

ISEG = IDIODEAVG. =

R =

VOH - VDF

ISEG

20mA AT LUMINOUS INTENSITY/SEGMENT = 250

µcd

a

b

c

d

e

f

g

A

B

C

D

LE

BL

VDD

VDD

LT

VSS

1.6V

AC OR DC

A MEDIUM BRIGHTNESS INTENSITY DISPLAY CAN BE OBTAINED WITH

LOW VOLTAGE FLUORESCENT DISPLAYS SUCH AS THE TUNG-SOL

DIGIVAC S/G* SERIES

* Trademark Tung-Sol Division Wagner Electric Co.

VSS

2 OF 7 SEGMENTS SHOWN CONNECTED

RESISTORS R FROM VDD TO EACH 7-SEGMENT DRIVER OUTPUT ARE

CHOSEN TO KEEP ALL NUMITRON SEGMENTS SLIGHTLY ON AND WARM

a

b

c

d

e

f

g

VDD = 5V

R

≈

400

Ω

VDD

R

≈ 400Ω

VDD

A

B

C

D

LE

BL

VDD

LT