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SN54LS47

更新时间： 2024-11-14 23:03:07
品牌 Logo 应用领域
摩托罗拉 - MOTOROLA 解码器驱动器
页数 文件大小 规格书
3页 109K
描述
BCD TO 7-SEGMENT DECODER/DRIVER

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SN54LS47 数据手册

 浏览型号SN54LS47的Datasheet PDF文件第2页浏览型号SN54LS47的Datasheet PDF文件第3页 
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  
123

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