參數(shù)資料
型號(hào)： SN74LS249DW
廠(chǎng)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(dòng)器
文件頁(yè)數(shù)： 4/8頁(yè)
文件大小： 280K
代理商： SN74LS249DW
5-405
FAST AND LS TTL DATA
SN54/74LS247
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
BI/RBO
54
74
1.6
3.2
mA
VO(off)
IO(on)
Off-State Output Voltage
a–g
54, 74
15
V
On-State Output Current
On-State Output Current
a–g
a–g
54
74
12
24
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
VOL
Output LOW Voltage
BI/RBO
54, 74
0.25
0.4
V
IOL = 1.6 mA
VCC = VCC MIN,
per Truth Table
74
0.35
0.5
V
IOL = 3.2 mA
VIN = VIL or VIH
IO(off)
Off-State Output Current
a–g
54, 74
250
μ
A
VCC = MAX, VIH = 2.0 V,
VO(off) = 15 V, VIL = MAX
VO(on)
On-State Output Voltage
a–g
54, 74
0.25
0.4
V
IO(on) = 12 mA
IO(on) = 24 mA
VIL per Truth Table
74
0.35
0.5
V
VCC = MIN, VIH = 2.0 V,
IIH
Input HIGH Current
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
7.0
13
mA
VCC = MAX
AC CHARACTERISTICS
(VCC = 5.0 V, TA = 25
°
C)
Symbol
Parameter
Limits
Unit
Test Conditions
Min
Typ
Max
tPLH
tPHL
Turn-Off Time from A Input
Turn-On Time from A Input
100
100
ns
RL = 665
tPHL
tPLH
Turn-Off Time from RBI Input
Turn-On Time from RBI Input
100
100
ns
CL = 15 pF,
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