7-835

CD4033BMS

FIGURE 13. INTERFACING THE CD4033BMS WITH COMMERCIALLY

AVAILABLE 7-SEGMENT DISPLAY DEVICES*

7-Segment Display Devices

INCANDESCENT READOUTS

Numitron DR2000 Series

TUBE REQUIREMENTS

VT = 3.5 - 5V

IT = 24mA Segment

ASSUMED

TRANSISTOR

CHARACTERISTICS

βdc (min) ≥ 25

VCE (sat)

≤ 0.5V

VDD = 8V (min)

IB = 1mA (min)

IT = 24mA (min)

CD4049UB

at VCC = 10V (min)

Vo “0”

≤ 2V

IT = 8mA (min)

VT

≈ 3.5V to 6V

CD4049UB

at VCC = 10V (min)

Vo “0”

≤ 0.6V

IT = 8mA (min)

at VCC = 6V (min)

Vo “0”

≤ 1V

IT = 5mA (min)

VT

≈ 1.5V to 3.5V

LOW-POWER INCANDESCENT READOUTS

PINLITES INC-Series O and R

ASSUMED

TRANSISTOR

CHARACTERISTICS

TUBE REQUIREMENTS

0-03-15

0-04-30

0-06-30

R-R3-20

R-R4-30

VT(V)

1.5

3

3

2

3

mA/Segment

8

8

8

4.3

4.3

βdc (min) ≥ 30

VCE (sat)

≤ 0.5V

VCC

≥ 3.5V (min)

IB

≥ 0.25mA (min)

IT

≤ 7.5mA (min)

*The interfacing buffers shown, while a necessity with the CD4033A, are not required when using the “B” devices; the “B” outputs (

≈ 10 times

the “A” outputs) can drive most display devices directly especially at voltages above 10V.

NEON READOUT (NIXIE TUBE**)

1. Alco Electronics - MG19

2. Burroughs - B5971, B7971, B8971

TUBE REQUIREMENTS

Alco MG19

Burroughs B5971

Burroughs B7971, B8971

VT(Vdc)

180

170

170

mA/Segment

0.5

3

6

LOW VOLTAGE VACUUM FLORESCENT READOUTS

1. Tung-Sol DIGIVAC S/G ‡ Type DT1704A or DT1705C

2. Nippon Electric (NEC): Type DG12E or LD915

TUBE REQUIREMENTS: 100 to 300

µA/segment at tube voltages of 12V

to 25V depending on required brightness Filament requirement 45mA at

1.6V, ac or dc.

‡ (Trademark) Wagner Electric Co.

**(Trademark) Burroughs Corp.

TRANSISTOR CHARACTERISTICS

Leakage with transistor cutoff - 0.05mA

V(BR)CER

βdc (min) ≥ 30

>VT

CD4033BMS

7

SEGMENTS

IB

1/7

IT

CLOCK

INHIBIT

RESET

VDD

VSS

IT

1/7 CA3081

OR EQUIVALENT

1 OF 7

SEGMENTS

VCC

VT

VT

1/6 CA4049UB

SEGMENTS

CD4033BMS

7

SEGMENTS

CLOCK

INHIBIT

RESET

VDD

VSS

1 OF 7

VT ª 170V DC

SEGMENTS

CD4033BMS

7

SEGMENTS

CLOCK

INHIBIT

RESET

VDD

VSS

13.5V

LOGIC

VOLTAGE

g

d

a

fb

ec

WITH VON = 18V MEDIUM BRIGHTNESS

IN LOW AMBIENT LIGHT BACKGROUND

WILL RESULT. THE POINT OF NO

NOTICEABLE GLOW IS VOFF

≈ 4.5V

≈ 4.5V

1.6V

AC OR DC