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74LS47的详细信息

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October 1988  
Revised March 2000  
DM74LS47  
BCD to 7-Segment Decoder/Driver with  
Open-Collector Outputs  
General Description  
Features  
Open-collector outputs  
The DM74LS47 accepts four lines of BCD (8421) input  
data, generates their complements internally and decodes  
the data with seven AND/OR gates having open-collector  
outputs to drive indicator segments directly. Each segment  
output is guaranteed to sink 24 mA in the ON (LOW) state  
and withstand 15V in the OFF (HIGH) state with a maxi-  
mum leakage current of 250 µA. Auxiliary inputs provided  
blanking, lamp test and cascadable zero-suppression func-  
tions.  
Drive indicator segments directly  
Cascadable zero-suppression capability  
Lamp test input  
Ordering Code:  
Order Number Package Number  
Package Description  
DM74LS47M  
DM74LS47N  
M16A  
N16E  
16-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-012, 0.150 Narrow  
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide  
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.  
Logic Symbol  
Connection Diagram  
V
= Pin 16  
CC  
GND = Pin 8  
Pin Descriptions  
Pin Names  
Description  
A0–A3  
RBI  
BCD Inputs  
Ripple Blanking Input (Active LOW)  
Lamp Test Input (Active LOW)  
LT  
BI/RBO  
Blanking Input (Active LOW) or  
Ripple Blanking Output (Active LOW)  
Segment Outputs (Active LOW) (Note 1)  
a –g  
Note 1: OC—Open Collector  
© 2000 Fairchild Semiconductor Corporation  
DS009817  
www.fairchildsemi.com  

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