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7447 Datasheet PDF - Fairchild Semiconductor

Part Number 7447
Description BCD to 7-Segment Decoders/Drivers
Manufacturers Fairchild Semiconductor 
Logo Fairchild Semiconductor Logo 

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September 1986
Revised July 2001
DM7446A, DM7447A
BCD to 7-Segment Decoders/Drivers
General Description
The DM7446A and DM7447A feature active-LOW outputs
designed for driving common-anode LEDs or incandescent
indicators directly. All of the circuits have full ripple-blank-
ing input/output controls and a lamp test input. Segment
identification and resultant displays are shown on a follow-
ing page. Display patterns for BCD input counts above nine
are unique symbols to authenticate input conditions.
All of the circuits incorporate automatic leading and/or trail-
ing-edge, zero-blanking control (RBI and RBO). Lamp test
(LT) of these devices may be performed at any time when
the BI/RBO node is at a HIGH logic level. All types contain
an overriding blanking input (BI) which can be used to con-
trol the lamp intensity (by pulsing) or to inhibit the outputs.
Features
s All circuit types feature lamp intensity modulation
capability
s Open-collector outputs drive indicators directly
s Lamp-test provision
s Leading/trailing zero suppression
Ordering Code:
Order Number
DM7446AN
DM7447AN
Package Number
Package Description
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
N16E
16-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300" Wide
Connection Diagram
© 2001 Fairchild Semiconductor Corporation DS006518
www.fairchildsemi.com

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7447 equivalent
DM7447A Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Symbol
Parameter
Conditions
VI
VOH
ICEX
VOL
II
Input Clamp Voltage
HIGH Level Output
Voltage (BI/RBO)
HIGH Level Output
Current (a thru g)
LOW Level Output
Voltage
Input Current @ Max
Input Voltage
VCC = Min, II = −12 mA
VCC = Min
IOH = Max
VCC = Max, VO = 15V
VIL = Max, VIH = Min
VCC = Min, IOL = Max
VIH = Min, VIL = Max
VCC = Max, VI = 5.5V
IIH
HIGH Level Input Current
VCC = Max, VI = 2.4V
IIL LOW Level Input
VCC = Max
Current
VI = 0.4V
IOS Short Circuit
VCC = Max
Output Current
(BI/RBO)
ICC Supply Current
VCC = Max
(Note 10)
Note 9: All typicals are at VCC = 5V, TA = 25°C.
Note 10: ICC is measured with all outputs OPEN and all inputs at 4.5V.
BI/RBO
Others
DM7447A Switching Characteristics
at VCC = 5V and TA = 25°C
Symbol
Parameter
tPLH Propagation Delay Time
LOW-to-HIGH Level Output
tPHL Propagation Delay Time
HIGH-to-LOW Level Output
CL = 15 pF
RL = 120
Conditions
Typ
Min Max
(Note 9)
1.5
2.4 3.7
250
0.3 0.4
1
40
4
1.6
4
60 103
Units
V
V
µA
V
mA
µA
mA
mA
mA
Min
Max
Units
100 ns
100 ns
5 www.fairchildsemi.com


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1. to 7-Segment Decoder/Driver - Fairchild

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