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參數(shù)資料
| 型號(hào)： | 74LS645 |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | Octal Bus Transceiver |
| 中文描述： | 八路總線收發(fā)器 |
| 文件頁(yè)數(shù)： | 2/5頁(yè) |
| 文件大?。?/td> | 52K |
| 代理商： | 74LS645 |
www.fairchildsemi.com
2
DM74LS645
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
for actual device operation.
Recommended Operating Conditions
Note 2: Voltage values are with respect to the network ground terminal.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 3: For conditions shown as Min or Max, use the appropriate value specified under Recommended Operating Conditions.
Note 4: All typicals are at VCC = 5V, TA = 25°C.
Note 5: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Supply Voltage
7V
Input Voltage
7V
Operating Free Air Temperature Range
0
°C to +70°C
Storage Temperature Range
55°C to +150°C
Symbol
Parameter
Min
Nom
Max
Units
VCC
Supply Voltage (Note 2)
4.75
5
5.25
V
VIH
HIGH Level Input Voltage
2
V
VIL
LOW Level Input Voltage
0.6
V
IOH
HIGH Level Output Current
15
mA
IOL
LOW Level Output Current
24
mA
TA
Free Air Operating Temperature
0
70
°C
Symbol
Parameter
Conditions (Note 3)
Min
Typ
Max
Units
(Note 4)
VI
Input Clamp Voltage
VCC = Min, II = 18 mA
1.5
V
HYS
Hysteresis (VT+ V)VCC = Min
0.2
0.4
V
A or B Input
VOH
HIGH Level Output Voltage
VCC = Min, VIH = 2V,
IOH = 3 mA
2.4
3.4
V
VIL = Max
IOH = Max
2
VOL
LOW Level Output Voltage
VCC = Min, VIH = 2V,
IOL = 12 mA
0.25
0.4
V
VIL = Max
IOL = 24 mA
0.35
0.5
IOZH
Off-State Output Current,
VCC = Max, G at 2V,
20
A
HIGH Level Voltage Applied
VO = 2.7V
IOZL
Off-State Output Current,
VCC = Max, G at 2V
400
A
LOW Level Voltage Applied
VO = 0.4V
II
Input Current at
VCC = Max
A or B
VI = 5.5V
0.1
mA
Maximum Input Voltage
DIR or G
VI = 7V
0.1
IIH
HIGH Level Input Current
VCC = Max, VIH = 2.7
20
A
IIL
LOW Level Input Current
VCC = Max, VIL = 0.4V
0.4
mA
IOS
Short Circuit Output Current (Note 5) VCC = Max
40
225
mA
ICC
Total Supply
Outputs HIGH
VCC = Max,
48
70
Current
Outputs LOW
Outputs Open
62
90
mA
Outputs at Hi-Z
64
95
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