SN54/74LS249 [MOTOROLA]
BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS; BCD到七段译码器/驱动器
| 型号： | SN54/74LS249 |
| 厂家： | 
MOTOROLA |
| 描述： | BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS |
| 文件： | 总8页 (文件大小：283K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
SN54/74LS247
SN54/74LS248
SN54/74LS249
BCD-TO-SEVEN-SEGMENT
DECODERS/DRIVERS
The SN54/74LS247 thru SN54/74LS249 are BCD-to-Seven-Segment
Decoder/Drivers.
The LS247 and LS248 are functionally and electrically identical to the LS47
and LS48 with the same pinout configuration. The LS249 is a 16-pin version
of the 14-pin LS49 and includes full functional capability for lamp test and
ripple blanking which was not available in the LS49.
BCD-TO-SEVEN-SEGMENT
DECODERS/DRIVERS
LOW POWER SCHOTTKY
Thecomposition of all characters, except the 6 and 9 are identical between
the LS247, 248, 249 and the LS47, 48 and 49. The LS47 thru 49 compose
the
and
without tails, the LS247 thru 249 compose the and with
the tails. The LS247 has active-low outputs for direct drive of indicators. The
LS248 and 249 have active-high outputs for driving lamp buffers.
J SUFFIX
CERAMIC
All types feature a lamp test input and have full ripple-blanking input/output
controls. On all types an automatic leading and/or trailing-edge zero-blanking
control (RBI and RBO) is incorporated and an overriding blanking input (BI)
is contained which may be used to control the lamp intensity by pulsing or to
inhibit the output’s lamp test may be performed at any time when the BI/RBO
node is at high level. Segment identification and resultant displays are shown
below. Display pattern for BCD input counts above 9 are unique symbols to
authenticate input conditions.
CASE 620-09
16
1
N SUFFIX
PLASTIC
CASE 648-08
16
1
LS247
• Open-Collector Outputs Drive Indicators Directly
• Lamp-Test Provision
• Leading/Trailing Zero Suppression
D SUFFIX
SOIC
CASE 751B-03
16
1
LS248
• Internal Pull-Ups Eliminate Need for External Resistors
• Lamp-Test Provision
• Leading/Trailing Zero Suppression
ORDERING INFORMATION
LS249
SN54LSXXXJ
Ceramic
• Open-Collector Outputs
• Lamp-Test Provision
• Leading/Trailing Zero Suppression
SN74LSXXXN Plastic
SN74LSXXXDW SOIC
NUMERICAL DESIGNATIONS AND RESULTANT DISPLAYS
SEGMENT
IDENTIFICATION
FAST AND LS TTL DATA
5-402
SN54/74LS247 • SN54/74LS248 • SN54/74LS249
SN54/74LS248
SN54/74LS259
(TOP VIEW)
SN54/74LS247
(TOP VIEW)
ALL CIRCUIT TYPES FEATURE LAMP INTENSITY MODULATION CAPABILITY
DRIVER OUTPUTS
TYPICAL
POWER
DISSIPATION
TYPE
ACTIVE
LEVEL
OUTPUT
CONFIGURATION
SINK
MAX
CURRENT VOLTAGE
SN54LS247
SN54LS248
SN54LS249
low
high
high
open-collector
2.0 kΩ pull-up
open-collector
12 mA
2.0 mA
4.0 mA
15 V
5.5 V
5.5 V
35 mW
125 mW
40 mW
SN74LS247
SN74LS248
SN74LS249
low
high
high
open-collector
2.0 kΩ pull-up
open-collector
24 mA
6.0 mA
8.0 mA
15 V
5.5 V
5.5 V
35 mW
125 mW
40 mW
LOGIC DIAGRAM
LS247
LS248, LS249
FAST AND LS TTL DATA
5-403
SN54/74LS247 • SN54/74LS248 • SN54/74LS249
LS247
FUNCTION TABLE
DECIMAL
OR
FUNCTION
INPUTS
OUTPUTS
d
BI/RBO
NOTE
LT
RBI
D
C
B
A
a
b
c
e
f
g
0
1
2
3
H
H
H
H
H
X
X
X
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
ON
OFF
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
ON
ON
ON
OFF
OFF OFF OFF
ON
OFF OFF
OFF
ON
ON
H
ON
ON
4
5
6
7
H
H
H
H
X
X
X
X
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
OFF
ON
ON
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
OFF
ON
ON
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
H
OFF
OFF OFF OFF
1
8
9
10
11
H
H
H
H
X
X
X
X
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF
ON
ON
ON
OFF
ON
ON
ON
ON
OFF OFF OFF
OFF OFF ON
H
OFF OFF
12
13
14
15
H
H
H
H
X
X
X
X
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
OFF
ON
ON
OFF OFF
OFF OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
ON
OFF OFF OFF
OFF OFF OFF OFF
H
OFF OFF OFF
BI
RBI
LT
X
H
L
X
L
X
X
L
X
X
L
X
X
L
X
X
L
X
L
L
H
OFF OFF OFF OFF
OFF OFF OFF OFF
OFF OFF OFF
OFF OFF OFF
2
3
4
ON
ON
ON
ON
ON
ON
ON
LS248, LS249
FUNCTION TABLE
DECIMAL
OR
FUNCTION
INPUTS
OUTPUTS
d
BI/RBO
a
NOTE
LT
RBI
D
C
B
A
b
c
e
f
g
0
1
2
3
H
H
H
H
H
X
X
X
L
L
L
L
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
H
L
H
H
H
H
H
H
H
H
L
H
L
H
H
H
L
H
L
H
L
L
L
L
L
H
H
1
1
H
H
4
5
6
7
H
H
H
H
X
X
X
X
L
L
L
L
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
L
H
H
H
H
L
L
H
H
H
H
L
H
H
L
L
L
H
L
H
H
H
L
H
H
H
L
H
H
1
8
9
10
11
H
H
H
H
X
X
X
X
H
H
H
H
L
L
L
L
L
L
H
H
L
H
L
H
H
H
H
H
H
L
H
H
L
H
H
L
H
H
H
H
H
L
H
L
H
H
L
H
H
H
H
H
L
L
H
L
12
13
14
15
H
H
H
H
X
X
X
X
H
H
H
H
H
H
H
H
L
L
H
H
L
H
L
H
H
H
H
L
H
L
H
L
L
L
L
L
L
L
L
H
H
L
L
L
H
L
H
H
H
L
H
H
H
L
H
L
BI
RBI
LT
X
H
L
X
L
X
X
L
X
X
L
X
X
L
X
X
L
X
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
L
L
H
2
3
4
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
NOTES: 1. 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
NOTES: 1. 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).
FAST AND LS TTL DATA
5-404
SN54/74LS247
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
I
I
Output Current — High BI/RBO
Output Current — Low BI/RBO
54, 74
–50
µA
OH
54
74
1.6
3.2
mA
OL
V
O(off)
Off-State Output Voltage a–g
54, 74
15
V
I
On-State Output Current a–g
On-State Output Current a–g
54
74
12
24
mA
O(on)
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
–0.65
4.2
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.4
2.4
Output HIGH Voltage
BI/RBO
= MIN, I
OH
= MAX, V = V
IN
CC
IH
OH
or V per Truth Table
IL
4.2
V
V
= V
CC
MIN,
= V or V
IL IH
54, 74
74
0.25
0.35
0.4
0.5
V
V
I
I
= 1.6 mA
= 3.2 mA
CC
IN
OL
Output LOW Voltage
BI/RBO
V
OL
per Truth Table
OL
Off-State Output Current
a–g
V
= MAX, V = 2.0 V,
CC IH
I
54, 74
250
µA
O(off)
V
O(off)
= 15 V, V = MAX
IL
54, 74
74
0.25
0.35
0.4
0.5
20
V
V
I
I
= 12 mA
= 24 mA
On-State Output Voltage
a–g
O(on)
V
V
= MIN, V = 2.0 V,
IH
CC
per Truth Table
V
O(on)
IL
O(on)
µA
mA
V
V
= MAX, V = 2.7 V
IN
CC
I
IH
Input HIGH Current
0.1
= MAX, V = 7.0 V
IN
CC
Input LOW Current
Any Input, except BI/RBO
–0.4
–1.2
I
IL
mA
V
CC
= MAX, V = 0.4 V
IN
BI/RBO
Short Circuit Current
BI/RBO (Note 1)
I
I
–0.3
–2.0
13
mA
mA
V
V
= MAX
= MAX
OS
CC
Power Supply Current
7.0
CC
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (V
CC
= 5.0 V, T = 25°C)
A
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Max
t
t
Turn-Off Time from A Input
Turn-On Time from A Input
100
100
PLH
PHL
ns
C
L
R
L
= 15 pF,
= 665 Ω
t
t
Turn-Off Time from RBI Input
Turn-On Time from RBI Input
100
100
PHL
PLH
ns
FAST AND LS TTL DATA
5-405
SN54/74LS248
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
Output Current — High BI/RBO
Output Current — High a–g
54, 74
54, 74
–50
I
µA
OH
–100
Output Current — Low BI/RBO
Output Current — Low BI/RBO
54
74
1.6
3.2
I
mA
OL
Output Current — Low a–g
Output Current — Low a–g
54
74
2.0
6.0
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
–0.65
4.2
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.4
2.4
Output HIGH Voltage
a–g and BI/RBO
= MIN, I
OH
= MAX, V = V
IN IH
CC
OH
or V per Truth Table
IL
4.2
Output Current
a–g
V
= MIN, V = 0.85 V,
O
CC
Input Conditions as for V
I
54, 74
–1.3
–2.0
mA
OH
OH
Output LOW Voltage
a–g
54, 74
74
0.25
0.35
0.25
0.35
0.4
0.5
0.4
0.5
20
I
I
I
I
= 2.0 mA
= 6.0 mA
= 1.6 mA
= 3.2 mA
OL
OL
OL
OL
V
V
V
= MIN, V = 2.0 V,
IH
CC
= per Truth Table
V
OL
IL
BI/RBO
54, 74
74
V
µA
V
= MAX, V = 2.7 V
IN
Input HIGH Current
Any Input, except BI/RBO
CC
CC
I
I
IH
0.1
mA
V
= MAX, V = 7.0 V
IN
Input LOW Current
Any Input, except BI/RBO
–0.4
–1.2
mA
V
CC
= MAX, V = 0.4 V
IN
IL
BI/RBO
Short Circuit Current
BI/RBO (Note 1)
I
I
–0.3
–2.0
38
mA
mA
V
V
= MAX
= MAX
OS
CC
Power Supply Current
25
CC
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (V
= 5.0 V, T = 25°C)
CC
A
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
Min
Max
t
t
Propagation Delay Time, High-to-Low-Level Output from A Input
Propagation Delay Time, Low-to-High-Level Output from A Input
100
100
C
= 15 pF
= 4.0 kΩ
PLH
PHL
L
ns
R
L
t
t
Propagation Delay Time, High-to-Low-Level Output from RBI Input
Propagation Delay Time, Low-to-High-Level Output from RBI Input
100
100
C
= 15 pF
= 6.0 kΩ
PHL
PLH
L
ns
R
L
FAST AND LS TTL DATA
5-406
SN54/74LS249
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
V
CC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
T
A
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°C
I
I
Output Current — High BI/RBO
54, 74
–50
µA
OH
Output Current — Low BI/RBO
Output Current — Low BI/RBO
54
74
1.6
3.2
mA
OL
V
OH
Output Voltage — High a–g
54, 74
5.5
V
I
Output Current — Low a–g
Output Current — Low a–g
54
74
4.0
8.0
mA
OL
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Min
Typ
Max
Symbol
Parameter
Input HIGH Voltage
Unit
Test Conditions
Guaranteed Input HIGH Voltage for
All Inputs
V
2.0
V
IH
54
74
0.7
0.8
Guaranteed Input LOW Voltage for
All Inputs
V
V
V
Input LOW Voltage
V
IL
Input Clamp Diode Voltage
–0.65
4.2
–1.5
V
V
V
V
V
= MIN, I = –18 mA
IN
IK
CC
54
74
2.4
2.4
Output HIGH Voltage
BI/RBO
= MIN, I
OH
= MAX, V = V
IN IH
CC
OH
or V per Truth Table
IL
4.2
Output HIGH Current
a–g
V
CC
V
OH
= MIN, V = 2.0 V,
IH
= 5.5 V, V = MAX
IL
I
54, 74
250
µA
OH
Output LOW Voltage
BI/RBO
54, 74
74
0.25
0.35
0.25
0.35
0.4
0.5
0.4
0.5
20
I
I
I
I
= 1.6 mA
= 3.2 mA
= 4.0 mA
= 8.0 mA
OL
OL
OL
OL
V
V
V
= MIN, V = 2.0 V,
IH
CC
= per Truth Table
V
OL
IL
a–g
54, 74
74
V
µA
V
= MAX, V = 2.7 V
IN
Input HIGH Current
Any Input, except BI/RBO
CC
CC
I
I
IH
0.1
mA
V
= MAX, V = 7.0 V
IN
Input LOW Current
Any Input, except BI/RBO
–0.4
–1.2
mA
V
CC
= MAX, V = 0.4 V
IN
IL
BI/RBO
Short Circuit Current
BI/RBO (Note 1)
I
I
–0.3
–2.0
15
mA
mA
V
V
= MAX
= MAX
OS
CC
Power Supply Current
8.0
CC
CC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
AC CHARACTERISTICS (V
= 5.0 V, T = 25°C)
CC
A
Limits
Typ
Symbol
Parameter
Unit
Test Conditions
= 15 pF, R = 2.0 Ω
Min
Max
t
t
Propagation Delay Time, High-to-Low-Level Output from A Input
Propagation Delay Time, Low-to-High-Level Output from A Input
100
100
PHL
PLH
ns
C
C
L
L
L
t
t
Propagation Delay Time, High-to-Low-Level Output from RBI Input
Propagation Delay Time, Low-to-High-Level Output from RBI Input
100
100
PHL
PLH
ns
= 15 pF, R = 6.0 Ω
L
FAST AND LS TTL DATA
5-407
Case 751B-03 D Suffix
16-Pin Plastic
SO-16
-A-
16
1
9
8
P
C
-B-
R X 45°
G
-T-
J
M
F
D
°
°
°
°
K
Case 648-08 N Suffix
16-Pin Plastic
-A-
16
1
9
B
S
8
F
L
C
K
-T-
M
H
J
G
D
°
°
°
°
Case 620-09 J Suffix
16-Pin Ceramic Dual In-Line
-A-
16
9
-B-
1
8
L
C
-T-
K
M
N
E
J
F
G
D
°
°
°
°
FAST AND LS TTL DATA
5-408
Motorolareserves the right to make changes without further notice to any products herein. Motorola makes no warranty, representationorguaranteeregarding
the suitability of its products for any particular purpose, nor does Motorola assume any liability arising out of the application or use of any product or circuit,
andspecifically disclaims any and all liability, includingwithoutlimitationconsequentialorincidentaldamages. “Typical” parameters can and do vary in different
applications. All operating parameters, including “Typicals” must be validated for each customer application by customer’s technical experts. Motorola does
not convey any license under its patent rights nor the rights of others. Motorola products are not designed, intended, or authorized for use as components in
systems intended for surgical implant into the body, or other applications intended to support or sustain life, or for any other application in which the failure of
the Motorola product could create a situation where personal injury or death may occur. Should Buyer purchase or use Motorola products for any such
unintendedor unauthorized application, Buyer shall indemnify and hold Motorola and its officers, employees, subsidiaries, affiliates, and distributors harmless
against all claims, costs, damages, and expenses, and reasonable attorney fees arising out of, directly or indirectly, any claim of personal injury or death
associated with such unintended or unauthorized use, even if such claim alleges that Motorola was negligent regarding the design or manufacture of the part.
Motorola and
are registered trademarks of Motorola, Inc. Motorola, Inc. is an Equal Opportunity/Affirmative Action Employer.
Literature Distribution Centers:
USA: Motorola Literature Distribution; P.O. Box 20912; Phoenix, Arizona 85036.
EUROPE: Motorola Ltd.; European Literature Centre; 88 Tanners Drive, Blakelands, Milton Keynes, MK14 5BP, England.
JAPAN: Nippon Motorola Ltd.; 4-32-1, Nishi-Gotanda, Shinagawa-ku, Tokyo 141, Japan.
ASIA PACIFIC: Motorola Semiconductors H.K. Ltd.; Silicon Harbour Center, No. 2 Dai King Street, Tai Po Industrial Estate, Tai Po, N.T., Hong Kong.
◊
相关型号：
©2020 ICPDF网 联系我们和版权申明