CD4511BMS Datasheet, PDF (10/11 Pages) Intersil Corporation – CMOS BCD-to-7-Segment Latch Decoder Drivers

CD4511BMS
Applications Interfacing with Various Displays
VDD
LT
VDD
A
BCD ^B
INPUTS C
D
LE
BL
TO VDD
LATCH
8
DECODER
ISEG
a
R
+
b
R
VOH
-
c
R
VSS
d
R
VDD
e
R
f
R
g
R
CD4511BMS
VSS
DUTY CYCLE = 100%
ISEG = IDIODEAVG. = 20mA AT LUMINOUS INTENSITY/SEGMENT = 250µcd
R = ^{VOH - VDF}
ISEG
VDF
+
-
LED 7-SEGMENT
DISPLAY
FIGURE 9. DRIVING COMMON CATHODE 7-SEGMENT LED DISPLAYS (EXAMPLE HEWLET-PACKARD 5082-7740)
LT
A
B
C
D
LE
BL
VDD
VDD
a
b
c
d
e
f
g
VSS
1.6V
AC OR DC
LT
A
B
C
D
LE
VDD
BL
VDD = 5V
a
b
c
d
VDD
e
f
R≈
g
400Ω
VDD
R ≈ 400Ω
VSS
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.
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
FIGURE 10. DRIVING LOW VOLTAGE FLOURESCENT DISPLAYS FIGURE 11. DRIVING INCANDESCENT DISPLAYS (RCA NU-
MITRON DR2000 SERIES DISPLAYS)
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