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DM7447A 데이터시트 PDF




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부품번호 DM7447A 기능
기능 BCD to 7-Segment Decoders/Drivers
제조업체 National Semiconductor
로고 National Semiconductor 로고


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DM7447A 데이터시트, 핀배열, 회로
June 1989
DM7446A DM5447A DM7447A
BCD to 7-Segment Decoders Drivers
General Description
The 46A and 47A feature active-low outputs designed for
driving common-anode LEDs or incandescent indicators di-
rectly All of the circuits have full ripple-blanking input out-
put controls and a lamp test input Segment identification
and resultant displays are shown on a following page Dis-
play 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
Y All circuit types feature lamp intensity modulation
capability
Y Open-collector outputs drive indicators directly
Y Lamp-test provision
Y Leading trailing zero suppression
Connection Diagram
Dual-In-Line Package
TL F 6518 – 1
Order Number DM5447AJ DM7446AN or DM7447AN
See NS Package Number J16A or N16E
C1995 National Semiconductor Corporation TL F 6518
RRD-B30M105 Printed in U S A




DM7447A pdf, 반도체, 판매, 대치품
’47A Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
Conditions
Min
tPLH
tPHL
Propagation Delay Time
Low to High Level Output
Propagation Delay Time
High to Low Level Output
CL e 15 pF
RL e 120X
Max Units
100 ns
100 ns
Function Table
46A 47A
Decimal or
Inputs
BI RBO
Outputs
Function
LT RBI D C B A (Note 1) a b c d e f g Note
0 H H LLLL H LLLLLLH
1 H X L L LH H HL LHHHH
2 H X LLHL H LLHLLHL
3 H X L LHH H L L L LHHL
4 H X LHL L H HL LHHL L
5 H X LHLH H LHLLHLL
6 H X LHHL H HHL L L L L
7
H X LHHH
H
L L LHHHH
(2)
8 H X HLLL H LLLLLLL
9 H X HL LH H L L LHHL L
10 H X H L H L H H H H L L H L
11 H X H L H H H H H L L H H L
12 H X H H L L H H L H H H L L
13 H X H H L H H L H H L H L L
14 H X H H H L H H H H L L L L
15 H X H H H H H H H H H H H H
BI
X X XXXX
L
HHHHHHH
(3)
RBI
H L LLLL
L
HHHHHHH
(4)
LT
L X XXXX
H
LLLLLLL
(5)
Note 1 BI RBO is a wire-AND logic serving as blanking input (BI) and or ripple-blanking output (RBO)
Note 2 The blanking input (BI) must be open or held at a high logic level when output functions 0 through 15 are desired The ripple-blanking input (RBI) must
be open or high if blanking of a decimal zero is not desired
Note 3 When a low logic level is applied directly to the blanking input (BI) all segment outputs are high regardless of the level of any other input
Note 4 When ripple-blanking input (RBI) and inputs A B C and D are at a low level with the lamp test input high all segment outputs go H and the ripple-
blanking output (RBO) goes to a low level (response condition)
Note 5 When the blanking input ripple-blanking output (BI RBO) is open or held high and a low is applied to the lamp-test input all segment outputs are L
H e High level L e Low level X e Don’t Care
4

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관련 데이터시트

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National Semiconductor
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