DM74LS47_07 Datasheet, PDF (1/8 Pages) Fairchild Semiconductor – BCD to 7-Segment Decoder/Driver with Open-Collector Outputs

March 1998
DM74LS47
BCD to 7-Segment Decoder/Driver with Open-Collector
Outputs
General Description
The ’LS47 accepts four lines of BCD (8421) input data, gen-
erates 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 with-
stand 15V in the OFF (HIGH) state with a maximum leakage
current of 250 µA. Auxiliary inputs provided blanking, lamp
test and cascadable zero-suppression functions.
Features
n Open-collector outputs
n Drive indicator segments directly
n Cascadable zero-suppression capability
n Lamp test input
Connection Diagram
Dual-In-Line Package
Note 1: *OC—Open Collector
DS009817-1
Order Number DM54LS47J, DM54LS47W,
DM74LS47M or DM74LS47N
See Package Number J16A, M16A, N16E or W16A
Pin Names
A0–A3
RBI
LT
BI/RBO
a –g
Description
BCD Inputs
Ripple Blanking Input (Active LOW)
Lamp Test Input (Active LOW)
Blanking Input (Active LOW) or
Ripple Blanking Output (Active LOW)
*Segment Outputs (Active LOW)
© 1998 Fairchild Semiconductor Corporation DS009817
www.fairchildsemi.com