參數(shù)資料
型號： SN74LS249DW
廠商： Motorola, Inc.
英文描述： >6V Fixed Gain, Enhanced Gain 10 dBm Amplifier
中文描述： BCD碼到七段解碼器/驅(qū)動器
文件頁數(shù)： 5/8頁
文件大?。?/td> 280K
代理商： SN74LS249DW
5-406
FAST AND LS TTL DATA
SN54/74LS248
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
Output Current — High
BI/RBO
54, 74
–50
μ
A
Output Current — High
a–g
54, 74
–100
IOL
Output Current — Low
Output Current — Low
BI/RBO
BI/RBO
54
74
1.6
3.2
mA
Output Current — Low
Output Current — Low
a–g
a–g
54
74
2.0
6.0
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
a–g and 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 Current
a–g
54, 74
–1.3
–2.0
mA
VCC = MIN, VO = 0.85 V,
Input Conditions as for VOH
VOL
Output LOW Voltage
a–g
54, 74
0.25
0.4
V
IOL = 2.0 mA
VIL = per Truth Table
74
0.35
0.5
IOL = 6.0 mA
VCC = MIN, VIH = 2.0 V,
BI/RBO
54, 74
0.25
0.4
V
IOL = 1.6 mA
IOL = 3.2 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
25
38
mA
VCC = MAX
AC CHARACTERISTICS
(VCC = 5.0 V, TA = 25
°
C)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
tPLH
tPHL
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 = 4.0 k
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 k
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