SN74LS249N 查看數據表（PDF） - Motorola => Freescale
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SN74LS249N Datasheet PDF : 8 Pages
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SN54 / 74LS247
GUARANTEED OPERATING RANGES
Symbol
Parameter
VCC
Supply Voltage
TA
Operating Ambient Temperature Range
IOH
Output Current — High BI / RBO
IOL
Output Current — Low BI / RBO
VO(off)
IO(on)
Off-State Output Voltage a – g
On-State Output Current a – g
On-State Output Current a – g
Min
Typ
Max
Unit
54
4.5
5.0
5.5
V
74
4.75
5.0
5.25
54
– 55
25
125
°C
74
0
25
70
54, 74
– 50
µA
54
1.6
mA
74
3.2
54, 74
15
V
54
12
mA
74
24
DC CHARACTERISTICS OVER OPERATING TEMPERATURE RANGE (unless otherwise specified)
Limits
Symbol
Parameter
Min Typ Max Unit
Test Conditions
VIH
Input HIGH Voltage
2.0
V
Guaranteed Input HIGH Voltage for
All Inputs
54
VIL
Input LOW Voltage
74
0.7
Guaranteed Input LOW Voltage for
0.8
V All Inputs
VIK
VOH
Input Clamp Diode Voltage
Output HIGH Voltage
54
BI / RBO
74
– 0.65 – 1.5
2.4
4.2
2.4
4.2
V VCC = MIN, IIN = – 18 mA
V VCC = MIN, IOH = MAX, VIN = VIH
V or VIL per Truth Table
VOL
Output LOW Voltage
BI / RBO
54, 74
74
0.25 0.4
0.35 0.5
V IOL = 1.6 mA
V IOL = 3.2 mA
VCC = VCC MIN,
VIN = VIL or VIH
per Truth Table
IO(off)
VO(on)
IIH
IIL
Off-State Output Current
a–g
On-State Output Voltage
a–g
54, 74
54, 74
74
Input HIGH Current
Input LOW Current
Any Input, except BI/ RBO
BI / RBO
250
0.25 0.4
0.35 0.5
20
0.1
– 0.4
– 1.2
µA
VCC = MAX, VIH = 2.0 V,
VO(off) = 15 V, VIL = MAX
V IO(on) = 12 mA VCC = MIN, VIH = 2.0 V,
V IO(on) = 24 mA VIL per Truth Table
µA VCC = MAX, VIN = 2.7 V
mA VCC = MAX, VIN = 7.0 V
mA VCC = MAX, VIN = 0.4 V
IOS
Short Circuit Current
BI / RBO (Note 1)
– 0.3
– 2.0 mA VCC = MAX
ICC
Power Supply Current
7.0
13
Note 1: Not more than one output should be shorted at a time, nor for more than 1 second.
mA VCC = MAX
AC CHARACTERISTICS (VCC = 5.0 V, TA = 25°C)
Limits
Symbol
Parameter
Min Typ Max Unit
tPLH
tPHL
Turn-Off Time from A Input
Turn-On Time from A Input
100
100
ns
tPHL
tPLH
Turn-Off Time from RBI Input
Turn-On Time from RBI Input
100
100
ns
Test Conditions
CL = 15 pF,
RL = 665 Ω
FAST AND LS TTL DATA
5-405
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