Document
74141
1-OF-10 DECODER/DRIVER (NIXIE)
(With Open-Collector Outputs)
141
CONNECTION DIAGRAM PINOUT A
DESCRIPTION— The ’141 is a BCD-to-decimal decoder driver that is de signed to accept a 4-bit BCD code input and drive cold-cathode indicator tubes. This decoder utilizes design improvements that minimize switching transients in order to maintain a stable display. The segments and numeric designations chosen to representthedecimal numbers areshown intheTruth Table. For binary inputs 10 through 15, the outputs are OFF. These invalid codes can be used in blanking leading ortrailing-edgezeroes in a display. The ten high performance, npn output transistors have a maximum reverse cur rent of 50 juA at 55 V. Typical power dissipation is 55 mW.
ORDERING CODE: See Section 9
PKGS
PIN OUT
COMMERCIAL GRADE
Vcc = +5.0 V ±5%, T a = 0°C to +70° C
Plastic DIP (P)
A
74141 PC
Ceramic DIP (D)
A
74141 DC
PKG TYPE
9B
6B
LOGIC SYMBOL
3
6
7
4
TTTTTTTTTT" 16 15 8 9 13 14 11 10 1 2
Vcc = Pin 5
G N D = Pin 12
INPUT LOADING/FAN-OUT: See Section 3 for U.L. definitions
PIN NAMES
DESCRIPTION
Ao Ai — A3 Co — Og
BCD Input BCD Inputs Outputs (Active LOW)
*OC — Open Collector
74XX (U.L.) HIGH/LOW
1 .0 / 1 .0 2 .0 / 2 . 0 OCV7.0 mA
141
FUNCTIONAL DESCRIPTION— The 1-of-10 decoder/driver accepts BCD inputs from all TTL circuits and produces the correct output selection to directly drive gas filled cold cathode indicator tubes. The outputs are selected as shown in the Truth Table. It is capable of driving all known available cold cathode indicator tubes having 7.0 mA or less cathode current.
Ao
Ai
LOGIC DIAGRAM
A2
TRUTH TABLE
A3
INPUTS
OUTPUT
A3 A2 A1 Ao
ONt
L LLL
0
L LLH
1
L L HL
2
L L HH
3
L HL L
4
L HL H
5
L HHL
6
L HHH
7
H LLL H LLH H XHX
8 9 NONE
H H X X NONE
t All other outputs are off
H = HIGH Voltage Level L = LOW Voltage Level X = Immaterial
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
SYMBOL
PARAMETER
74XX
Min
Max
UNITS
CO N D ITIO N S
VOL
Output LOW Voltage
Output HIGH Voltage
VOH
(for Input Counts 0 thru 9)
2.5 60
V
Vcc = Min
lo = 7.0 mA
V
Vcc = Max lo = 0.5 mA
lO H
Output HIGH Current
50
/x A
Vcc = Max V0 = 55 V
Output HIGH Current
lO H
(for Input Counts 10 thru 15)
5.0
TA = 55° C Vcc = Max
15
/*A
T a =70°C
Vo = 30 V
Icc
Power Supply Current
25
mA
Vcc = Max All Inputs = Gnd
.