參數(shù)資料
型號(hào)： SN54LS249
廠商： Motorola, Inc.
英文描述： BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS
中文描述： BCD碼到七段解碼器/驅(qū)動(dòng)器
文件頁(yè)數(shù)： 6/8頁(yè)
文件大小： 280K
代理商： SN54LS249
5-407
FAST AND LS TTL DATA
SN54/74LS249
GUARANTEED OPERATING RANGES
Symbol
Parameter
Min
Typ
Max
Unit
VCC
Supply Voltage
54
74
4.5
4.75
5.0
5.0
5.5
5.25
V
TA
Operating Ambient Temperature Range
54
74
–55
0
25
25
125
70
°
C
IOH
IOL
Output Current — High
BI/RBO
54, 74
–50
μ
A
Output Current — Low
Output Current — Low
BI/RBO
BI/RBO
54
74
1.6
3.2
mA
VOH
IOL
Output Voltage — High
a–g
54, 74
5.5
V
Output Current — Low
Output Current — Low
a–g
a–g
54
74
4.0
8.0
mA
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE
(unless otherwise specified)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
VIL
Input LOW Voltage
54
0.7
V
Guaranteed Input LOW Voltage for
All Inputs
74
0.8
VIK
Input Clamp Diode Voltage
–0.65
–1.5
V
VCC = MIN, IIN = –18 mA
VOH
Output HIGH Voltage
BI/RBO
54
2.4
4.2
V
or VIL per Truth Table
74
2.4
4.2
V
VCC = MIN, IOH = MAX, VIN = VIH
IOH
Output HIGH Current
a–g
54, 74
250
μ
A
VCC = MIN, VIH = 2.0 V,
VOH = 5.5 V, VIL = MAX
VOL
Output LOW Voltage
BI/RBO
54, 74
0.25
0.4
V
IOL = 1.6 mA
VIL = per Truth Table
74
0.35
0.5
IOL = 3.2 mA
VCC = MIN, VIH = 2.0 V,
a–g
54, 74
0.25
0.4
V
IOL = 4.0 mA
IOL = 8.0 mA
74
0.35
0.5
IIH
Input HIGH Current
Any Input, except BI/RBO
20
μ
A
VCC = MAX, VIN = 2.7 V
VCC = MAX, VIN = 7.0 V
0.1
mA
IIL
Input LOW Current
Any Input, except BI/RBO
–0.4
mA
VCC = MAX, VIN = 0.4 V
BI/RBO
–1.2
IOS
Short Circuit Current
BI/RBO (Note 1)
–0.3
–2.0
mA
VCC = MAX
ICC
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
Power Supply Current
8.0
15
mA
VCC = MAX
AC CHARACTERISTICS
(VCC = 5.0 V, TA = 25
°
C)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
tPHL
tPLH
Propagation Delay Time, High-to-Low-Level Output from A Input
Propagation Delay Time, Low-to-High-Level Output from A Input
100
100
ns
CL = 15 pF, RL = 2.0
tPHL
tPLH
Propagation Delay Time, High-to-Low-Level Output from RBI Input
Propagation Delay Time, Low-to-High-Level Output from RBI Input
100
100
ns
CL = 15 pF, RL = 6.0
相關(guān)PDF資料
PDF描述
SN74LS249 BCD-TO-SEVEN-SEGMENT DECODERS/DRIVERS
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