SN74LS47N [MOTOROLA]
BCD TO 7-SEGMENT DECODER/DRIVER; BCD到7段解码器/驱动器
| 型号： | SN74LS47N |
| 厂家： | 
MOTOROLA |
| 描述： | BCD TO 7-SEGMENT DECODER/DRIVER |
| 文件： | 总3页 (文件大小：109K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS47
BCD TO 7-SEGMENT
DECODER/DRIVER
The SN54/74LS47 are Low Power Schottky BCD to 7-Segment Decod-
er/Drivers consisting of NAND gates, input buffers and seven AND-OR-IN-
VERT gates. They offer active LOW, high sink current outputs for driving
indicators directly. Seven NAND gates and one driver are connected in pairs
to make BCD data and its complement available to the seven decoding
AND-OR-INVERT gates. The remaining NAND gate and three input buffers
provide lamp test, blanking input/ripple-blanking output and ripple-blanking
input.
BCD TO 7-SEGMENT
DECODER/DRIVER
LOW POWER SCHOTTKY
The circuits accept 4-bit binary-coded-decimal (BCD) and, depending on
thestate of the auxiliary inputs, decodes this datatodrivea7-segmentdisplay
indicator. The relative positive-logic output levels, as well as conditions
required at the auxiliary inputs, are shown in the truth tables. Output
configurations of the SN54/74LS47 are designed to withstand the relatively
high voltages required for 7-segment indicators.
These outputs will withstand 15 V with a maximum reverse current of
250 µA. Indicator segments requiring up to 24 mA of current may be driven
directly from the SN74LS47 high performance output transistors. Display
patterns for BCD input counts above nine are unique symbols to authenticate
input conditions.
The SN54/74LS47 incorporates automatic leading and/or trailing-edge
zero-blankingcontrol(RBIandRBO). Lamptest(LT)maybeperformedatany
time which the BI/RBO node is a HIGH level. This device also contains an
overriding blanking input (BI) which can be used to control the lamp intensity
by varying the frequency and duty cycle of the BI input signal or to inhibit the
outputs.
J SUFFIX
CERAMIC
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
• Lamp Intensity Modulation Capability (BI/RBO)
• Open Collector Outputs
• Lamp Test Provision
D SUFFIX
SOIC
CASE 751B-03
16
1
• Leading/Trailing Zero Suppression
• Input Clamp Diodes Limit High-Speed Termination Effects
ORDERING INFORMATION
CONNECTION DIAGRAM DIP (TOP VIEW)
SN54LSXXJ
SN74LSXXN
SN74LSXXD
Ceramic
Plastic
SOIC
V
f
g
a
b
c
d
e
CC
16
15
14
13
12
11
10
9
LOGIC SYMBOL
7
1
2
6
3
5
1
2
3
4
5
6
8
7
A
B
C
D
LT RBI
B
C
LT BI/RBO RBI
D
A
GND
PIN NAMES
LOADING (Note a)
BI/
g
RBO
HIGH
LOW
a
b
c
d
e
9
f
A, B, C, D
RBI
LT
BCD Inputs
0.5 U.L.
0.5 U.L.
0.5 U.L.
0.25 U.L.
0.25 U.L.
0.25 U.L.
Ripple-Blanking Input
Lamp-Test Input
Blanking Input or
Ripple-Blanking Output
Outputs
13 12 11 10
15 14
4
BI/RBO
0.5 U.L.
1.2 U.L.
Open-Collector
0.75 U.L.
2.0 U.L.
15 (7.5) U.L.
V
= PIN 16
CC
GND = PIN 8
a, to g
NOTES:
a) 1 Unit Load (U.L.) = 40 µA HIGH, 1.6 mA LOW.
b) Output current measured at V = 0.5 V
OUT
The Output LOW drive factor is 7.5 U.L. for Military (54) and 15 U.L. for Commercial (74) Temperature Ranges.
FAST AND LS TTL DATA
5-56
SN54/74LS47
LOGIC DIAGRAM
a
b
a
b
A
B
INPUT
C
D
c
d
e
c
d
e
OUTPUT
BLANKING INPUT OR
RIPPLE-BLANKING
OUTPUT
f
f
LAMP-TEST
INPUT
RIPPLE-BLANKING
INPUT
g
g
0
1
2
3
4
5
6
7
8
9
10 11 12 13 14 15
NUMERICAL DESIGNATIONS — RESULTANT DISPLAYS
TRUTH TABLE
INPUTS
OUTPUTS
DECIMAL
OR
LT
RBI
D
C
B
A
BI/RBO
a
b
c
d
e
f
g
NOTE
FUNCTION
0
1
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
H
L
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
L
L
L
L
L
L
L
H
L
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
L
L
L
L
L
L
H
L
L
H
L
L
H
H
H
L
H
H
L
L
L
L
L
H
L
L
L
L
L
L
L
H
H
H
L
A
A
2
L
L
H
H
L
L
H
L
3
L
L
H
L
L
L
L
H
H
H
L
4
L
H
H
H
H
L
H
L
L
L
H
L
5
L
L
H
L
H
H
L
L
L
6
L
H
H
L
H
L
L
L
L
7
L
H
L
L
H
L
H
L
H
L
8
H
H
H
H
H
H
H
H
X
L
L
L
L
9
L
L
H
L
L
L
L
H
L
H
L
L
10
11
12
13
14
15
BI
RBI
LT
L
H
H
L
H
H
H
L
H
H
L
H
L
H
H
L
L
H
L
L
H
H
H
L
H
H
H
H
X
L
H
H
H
H
H
H
L
H
L
L
H
L
H
H
H
H
H
L
L
H
H
X
L
H
H
H
H
L
L
L
H
X
L
H
H
H
L
H
H
H
L
H
H
H
L
B
C
D
L
X
X
X
X
X
H
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
NOTES:
(A) BI/RBO is wire-AND logic serving as blanking Input (BI) and/or ripple-blanking output (RBO). The blanking out (BI) must be open or held
ataHIGHlevelwhenoutputfunctions0through15aredesired,andripple-blankinginput(RBI)mustbeopenorataHIGHlevelifblanking
of a decimal 0 is not desired. X = input may be HIGH or LOW.
(B) When a LOW level is applied to the blanking input (forced condition) all segment outputs go to a LOW level regardless of the state of
any other input condition.
(C) When ripple-blanking input (RBI) and inputs A, B, C, and D are at LOW level, with the lamp test input at HIGH level, all segment outputs
go to a HIGH level and the ripple-blanking output (RBO) goes to a LOW level (response condition).
(D) When the blanking input/ripple-blanking output (BI/RBO) is open or held at a HIGH level, and a LOW level is applied to lamp test input,
all segment outputs go to a LOW level.
FAST AND LS TTL DATA
5-57
SN54/74LS47
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
I
I
Output Current — High
Output Current — Low
BI/RBO
54, 74
–50
µA
OH
BI/RBO
BI/RBO
54
74
1.6
3.2
mA
OL
V
Off-State Output Voltage a to g
54, 74
15
V
O (off)
I
On-State Output Current a to g
On-State Output Current a to g
54
74
12
24
mA
O (on)
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Min
Typ
Max
Guaranteed Input HIGH Theshold Voltage
for All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Threshold Voltage
for All Inputs
V
V
V
Input LOW Voltage
V
V
V
IL
Input Clamp Diode Voltage
Output HIGH Voltage, BI/RBO
–0.65
4.2
–1.5
V
CC
= MIN, I = –18 mA
IN
IK
V
V
= MIN, I = –50 µA,
OH
CC
IN
2.4
OH
= V or V per Truth Table
IN
IL
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
= 1.6 mA
= 3.2 mA
Output LOW Voltage
BI/RBO
V = MIN, V = V or
CC IN IN
V per Truth Table
IL
OL
V
OL
I
OL
Off-State Output Current
a thru g
V
= MAX, V = V or V per Truth
CC
Table, V
IN
IN
IL
I
250
µA
O (off)
= 15 V
O (off)
V
= MAX, V = V
IN
IL
54, 74
74
0.25
0.35
0.4
0.5
20
V
V
I
I
= 12 mA
= 24 mA
On-State Output Voltage
a thru g
CC
IH
O (on)
V
O (on)
or V per Truth Table
O (on)
µA
mA
V
V
= MAX, V = 2.7 V
IN
= MAX, V = 7.0 V
IN
CC
CC
I
IH
Input HIGH Current
0.1
Input LOW Current BI/RBO
Any Input except BI/RBO
–1.2
–0.4
I
IL
mA
V
CC
= MAX, V = 0.4 V
IN
I
I
BI/RBO
Output Short Circuit Current (Note 1)
Power Supply Current
–0.3
–2.0
13
mA
mA
V
V
= MAX, V
= 0 V
OUT
OS
CC
7.0
= MAX
CC
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (T = 25°C)
A
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Max
t
t
Propagation Delay, Address
Input to Segment Output
100
100
ns
ns
PHL
PLH
V
C
= 5.0 V
CC
= 15 pF
L
t
t
Propagation Delay, RBI Input
To Segment Output
100
100
ns
ns
PHL
PLH
AC WAVEFORMS
V
1.3 V
1.3 V
PLH
1.3 V
1.3 V
IN
V
IN
t
t
t
PHL
t
PHL
PLH
V
1.3 V
1.3 V
OUT
1.3 V
1.3 V
V
OUT
Figure 1
Figure 2
FAST AND LS TTL DATA
5-58
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