CIRCUIT FEATURES LAMP INTENSITY MODULATION CAPABILITY
DRIVER OUTPUTS
TYPE
SN74LS247
ACTIVE
LEVEL
low
OUTPUT
CONFIGURATION
open-collector
SINK
CURRENT
24 mA
MAX
VOLTAGE
15 V
TYPICAL
POWER
DISSIPATION
35 mW
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2
SN74LS247
LOGIC DIAGRAM
LS247
(13)
INPUT (7)
A
INPUT (1)
B
INPUT (2)
C
INPUT (6)
D
BI/RBO
BLANKING
(4)
INPUT OR
RIPPLE-BLANKING
OUTPUT
(3)
LAMP TEST
INPUT
RBI
(5)
RIPPLE-BLANKING
INPUT
(12)
OUTPUT
a
OUTPUT
b
OUTPUT
c
OUTPUT
d
OUTPUT
e
OUTPUT
f
OUTPUT
g
(11)
(10)
(9)
(15)
(14)
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3
SN74LS247
LS247
FUNCTION TABLE
DECIMAL
OR
FUNCTION
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
BI
RBI
LT
INPUTS
LT
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
X
H
L
RBI
H
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
X
L
X
D
L
L
L
L
L
L
L
L
H
H
H
H
H
H
H
H
X
L
X
C
L
L
L
L
H
H
H
H
L
L
L
L
H
H
H
H
X
L
X
B
L
L
H
H
L
L
H
H
L
L
H
H
L
L
H
H
X
L
X
A
L
H
L
H
L
H
L
H
L
H
L
H
L
H
L
H
X
L
X
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
H
L
L
H
BI/RBO
a
ON
OFF
ON
ON
OFF
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
OFF
ON
b
ON
ON
ON
ON
ON
OFF
OFF
ON
ON
ON
OFF
OFF
ON
OFF
OFF
OFF
OFF
OFF
ON
c
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
OFF
ON
OFF
OFF
OFF
OFF
OFF
OFF
ON
OUTPUTS
d
ON
OFF
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
OFF
ON
e
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
ON
OFF
ON
OFF
OFF
OFF
ON
OFF
OFF
OFF
ON
f
ON
OFF
OFF
OFF
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
OFF
OFF
OFF
ON
g
OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
ON
ON
ON
ON
ON
ON
OFF
OFF
OFF
ON
2
3
4
NOTE
1
H = HIGH Level, L = LOW Level, X = Irrelevant
NOTES: 1. 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.
2. When a low logic level is applied directly to the blanking input (BI), all segment outputs are off regardless of the level of any other input.
3. 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 off and the
ripple-blanking output (RBO) goes to a low level (response condition).
4. 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 on.
BI/RBO is wire-AND logic serving as blanking input (BI) and/or ripple-blanking output (RBO).
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4
SN74LS247
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Limits
Symbol
V
IH
V
IL
V
IK
V
OH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
BI / RBO
Output LOW Voltage
g
BI / RBO
Off-State Output Current
a–g
On-State Output Voltage
g
a–g
Input HIGH Current
0.1
Input LOW Current
Any Input, except BI / RBO
BI / RBO
I
OS
I
CC
Short Circuit Current
BI / RBO (Note 1)
Power Supply Current
– 0.3
7.0
– 0.4
– 1.2
– 2.0
13
mA
mA
V
CC
= MAX
V
CC
= MAX
0.25
0.35
2.4
– 0.65
4.2
0.25
0.35
0.4
0.5
250
0.4
0.5
20
I
IH
Min
2.0
0.8
– 1.5
Typ
Max
Unit
V
V
V
V
V
V
µA
V
V
µA
mA
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
Guaranteed Input LOW Voltage for
All Inputs
V
CC
= MIN, I
IN
= – 18 mA
V
CC
= MIN, I
OH
= MAX, V
IN
= V
IH
or V
IL
per Truth Table
I
OL
= 1.6 mA
I
OL
= 3.2 mA
V
CC
= V
CC
MIN,
V
IN
= V
IL
or V
IH
per Truth Table
V
O
OL
I
O(off)
V
O( )
O(on)
V
CC
= MAX, V
IH
= 2.0 V,
V
O(off)
= 15 V, V
IL
= MAX
I
O(on)
= 12 mA
I
O(on)
= 24 mA
V
CC
= MIN, V
IH
= 2.0 V,
V
IL
per Truth Table
V
CC
= MAX, V
IN
= 2.7 V
V
CC
= MAX, V
IN
= 7.0 V
V
CC
= MAX, V
IN
= 0.4 V
I
IL
mA
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
本帖最后由 dql2016 于 2017-5-26 21:02 编辑
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