XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
General Description
The 74HC/HCT240 is an 8-bit inverting buffer/line driver with 3-state outputs. The device can be used as two
4-bit buffers or one 8-bit buffer. The device features two output enables (1O� and 2O�), each controlling four of the
3-state outputs. A HIGH on nO� causes the outputs to assume a high-impedance OFF-state. Inputs include clamp
diodes that enable the use of current limiting resistors to interface inputs to voltages in excess of VCC.
Features
Input levels:
For 74HC240: CMOS level
For 74HCT240: TTL level
Inverting 3-state outputs
Specified from -40℃ to +105℃
Packaging information: DIP20/SOP20/TSSOP20
ORDERING INFORMATION
DEVICE
Package Type
MARKING
Packing
Packing QTY
SN74HC240N
SN74HC240DTR
SN74HCT240DTR
SN74HCT240TDTR
DIP-20
SOP-20
SOP-20
TSSOP-20
74HC240N
74HC240
74HCT240
74HCT240
Tube
Tape
Tape
Tape
720/Box
2000/Reel
2000/Reel
2000/Reel
XBLW version 1.0
文档仅供参考,实际应用测试为准
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第 1 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Block Diagram And Pin Description
Block Diagram
Figure 1. Logic symbol
Figure 2. IEC Logic symbol
Figure 3. Functional diagram
Pin Configurations
XBLW version 1.0
文档仅供参考,实际应用测试为准
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第 2 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Pin Description
Pin No.
Pin Name
Description
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
1O�
1A0
2Y0
1A1
2Y1
1A2
2Y2
1A3
2Y3
GND
2A3
1Y3
2A2
1Y2
2A1
1Y1
2A0
1Y0
2O�
VCC
output enable input(active LOW)
data input
bus output
data input
bus output
data input
bus output
data input
bus output
ground(0V)
data input
bus output
data input
bus output
data input
bus output
data input
bus output
output enable input(active LOW)
supply voltage
Function Table
Input
nO�
L
Output
nAn
L
nYn
H
L
H
L
H
X
Z
Note: H=HIGH voltage level; L=LOW voltage level; X=don’t care; Z=high-impedance OFF-state.
XBLW version 1.0
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第 3 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Electrical Parameter
Absolute Maximum Ratings (Voltages are referenced to GND (ground=0V), unless otherwise specified.)
Parameter
Symbol
Conditions
Min.
Max.
Unit
supply voltage
input clamping current
output clamping current
output current
supply current
ground current
storage temperature
total power dissipation
VCC
IIK
IOK
IO
ICC
IGND
Tstg
Ptot
-0.5
-70
-65
-
+7.0
±20
±20
±35
70
+150
500
V
mA
mA
mA
mA
mA
℃
mW
soldering temperature
TL
VI < -0.5V or VI > VCC +0.5V
VO < -0.5V or VO > VCC +0.5V
-0.5V < VO < VCC +0.5V
DIP
10s
SOP
245
250
℃
Note:
[1] For DIP20 packages: above 70℃ the value of Ptot derates linearly with 12mW/K.
[2] For SOP20 packages: above 70℃ the value of Ptot derates linearly with 8mW/K.
[3] For (T)SSOP20 packages: above 60℃ the value of Ptot derates linearly with 5.5mW/K.
Recommended Operating Conditions
Parameter
Symbol
supply voltage
input voltage
output voltage
VCC
VI
VO
input transition
rise and fall rate
Δt/ΔV
ambient temperature
Tamb
supply voltage
input voltage
output voltage
input transition
rise and fall rate
ambient temperature
VCC
VI
VO
XBLW version 1.0
Conditions
-
74HC240
VCC=2.0V
VCC=4.5V
VCC=6.0V
74HCT240
-
Min.
Typ.
Max.
Unit
2.0
0
0
-40
5.0
1.67
-
6.0
VCC
VCC
625
139
83
+105
V
V
V
ns/V
ns/V
ns/V
℃
4.5
0
0
5.0
-
5.5
VCC
VCC
V
V
V
Δt/ΔV
VCC=4.5V
-
1.67
139
ns/V
Tamb
-
-40
-
+105
℃
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第 4 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Electrical Characteristics
DC Characteristics 1 (Tamb=25℃, voltages are referenced to GND (ground=0V), unless otherwise specified.)
Parameter
Symbol
Conditions
HIGH-level
input voltage
VIH
LOW-level
input voltage
VIL
HIGH-level
output voltage
VOH
VI=VIH or VIL
LOW-level
output voltage
VOL
VI=VIH or VIL
input leakage
current
OFF-state
output current
supply current
IOZ
input apacitance
CI
HIGH-level
input voltage
LOW-level
input voltage
II
ICC
74HC240
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
IO=-20uA;VCC=2.0V
IO=-20uA;VCC=4.5V
IO=-20uA;VCC=6.0V
IO=-6.0mA;VCC=4.5V
IO=-7.8mA;VCC=6.0V
IO=20uA;VCC=2.0V
IO=20uA;VCC=4.5V
IO=20uA;VCC=6.0V
IO=6.0mA;VCC=4.5V
IO=7.8mA;VCC=6.0V
VI=Vcc or GND;VCC=6.0V
VI=VIH or VIL;VCC=6.0V;
VO=VCC or GND
VI=VCC or GND;IO=0A;VCC=6.0V
74HCT240
Max.
Unit
1.5
3.15
4.2
1.9
4.4
5.9
3.98
5.48
-
1.2
2.4
3.2
0.8
2.1
2.8
2.0
4.5
6.0
4.32
5.81
0
0
0
0.15
0.16
0.5
1.35
1.8
0.1
0.1
0.1
0.26
0.26
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
-
-
±0.1
μA
-
-
±0.5
μA
-
-
8.0
μA
-
3.5
-
pF
VCC=4.5V to 5.5V
2.0
1.6
-
V
VIL
VCC=4.5V to 5.5V
-
1.2
0.8
V
4.4
3.98
-
4.5
4.32
0
0.16
0.1
0.26
V
V
V
V
-
-
±0.1
μA
-
-
±0.5
μA
-
-
8.0
μA
VOH
VI=VIH or VIL
VCC=4.5V
LOW-level
output voltage
VOL
VI=VIH or VIL
VCC=4.5V
XBLW version 1.0
Typ.
VIH
HIGH-level
output voltage
input leakage
current
OFF-state
output current
supply current
Min.
II
IOZ
ICC
IO=-20uA
IO=-6.0uA
IO=20uA
IO=6.0uA
VI=Vcc or GND;VCC=5.5V
VI=VIH or VIL;VCC=5.5V;
VO=VCC or GND
VI=VCC or GND;IO=0A;VCC=5.5V
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第 5 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Additional
Supply currend
ΔICC
input apacitance
CI
per input pin;
VI=VCC-2.1V;
other inputs at VCC
or GND;IO=0V;
VCC=4.5V to 5.5V
nAn or inputs
-
150
540
μA
nO� input
-
70
252
μA
-
3.5
-
pF
-
DC Characteristics 2
(Tamb=-40℃ to +85℃, voltages are referenced to GND (ground=0V), unless otherwise specified.)
Parameter
Symbol
Conditions
HIGH-level
input voltage
VIH
LOW-level
input voltage
VIL
HIGH-level
output voltage
VOH
VI=VIH or VIL
LOW-level
output voltage
VOL
VI=VIH or VIL
input leakage
current
OFF-state
output current
supply current
II
IOZ
ICC
74HC240
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
IO=-20uA;VCC=2.0V
IO=-20uA;VCC=4.5V
IO=-20uA;VCC=6.0V
IO=-6.0mA;VCC=4.5V
IO=-7.8mA;VCC=6.0V
IO=20uA;VCC=2.0V
IO=20uA;VCC=4.5V
IO=20uA;VCC=6.0V
IO=6.0mA;VCC=4.5V
IO=7.8mA;VCC=6.0V
VI=Vcc or GND;VCC=6.0V
VI=VIH or VIL;VCC=6.0V;
VO=VCC or GND
VI=VCC or GND;IO=0A;VCC=6.0V
Min.
Typ.
Max.
Unit
1.5
3.15
4.2
1.9
4.4
5.9
3.84
5.34
-
-
0.5
1.35
1.8
0.1
0.1
0.1
0.33
0.33
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
-
-
±1.0
μA
-
-
±5.0
μA
-
-
80
μA
74HCT240
HIGH-level
input voltage
LOW-level
input voltage
VIH
VCC=4.5V to 5.5V
2.0
-
-
V
VIL
VCC=4.5V to 5.5V
-
-
0.8
V
4.4
3.84
-
-
0.1
0.33
V
V
V
V
-
-
±1.0
μA
HIGH-level
output voltage
VOH
VI=VIH or VIL
VCC=4.5V
LOW-level
output voltage
VOL
VI=VIH or VIL
VCC=4.5V
input leakage
II
XBLW version 1.0
IO=-20uA
IO=-6.0uA
IO=20uA
IO=6.0uA
VI=Vcc or GND;VCC=5.5V
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第 6 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
current
OFF-state
output current
supply current
IOZ
ICC
Additional
Supply currend
ΔICC
VI=VIH or VIL;VCC=5.5V;
VO=VCC or GND
VI=VCC or GND;IO=0A;VCC=5.5V
per input pin;
nAn or inputs
VI=VCC-2.1V;
other inputs at VCC
nO� input
or GND;IO=0V;
VCC=4.5V to 5.5V
-
-
±5.0
μA
-
-
80
μA
-
-
675
μA
-
-
315
μA
DC Characteristics 3
(Tamb=-40℃ to +105℃, voltages are referenced to GND (ground=0V), unless otherwise specified.)
Parameter
Symbol
Conditions
HIGH-level
input voltage
VIH
LOW-level
input voltage
VIL
HIGH-level
output voltage
VOH
VI=VIH or VIL
LOW-level
output voltage
VOL
VI=VIH or VIL
input leakage
current
OFF-state
output current
supply current
II
IOZ
ICC
74HC240
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
IO=-20uA;VCC=2.0V
IO=-20uA;VCC=4.5V
IO=-20uA;VCC=6.0V
IO=-6.0mA;VCC=4.5V
IO=-7.8mA;VCC=6.0V
IO=20uA;VCC=2.0V
IO=20uA;VCC=4.5V
IO=20uA;VCC=6.0V
IO=6.0mA;VCC=4.5V
IO=7.8mA;VCC=6.0V
VI=Vcc or GND;VCC=6.0V
VI=VIH or VIL;VCC=6.0V;
VO=VCC or GND
VI=VCC or GND;IO=0A;VCC=6.0V
Min.
Typ.
Max.
Unit
1.5
3.15
4.2
1.9
4.4
5.9
3.7
5.2
-
-
0.5
1.35
1.8
0.1
0.1
0.1
0.4
0.4
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
V
-
-
±1.0
μA
-
-
±10
μA
-
-
160
μA
74HCT240
HIGH-level
input voltage
LOW-level
input voltage
HIGH-level
output voltage
XBLW version 1.0
VIH
VCC=4.5V to 5.5V
2.0
-
-
V
VIL
VCC=4.5V to 5.5V
-
-
0.8
V
4.4
3.7
-
-
V
V
VOH
VI=VIH or VIL
VCC=4.5V
IO=-20uA
IO=-6.0uA
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第 7 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
LOW-level
output voltage
VOL
input leakage
current
OFF-state
output current
supply current
II
IOZ
ICC
Additional
Supply currend
ΔICC
IO=20uA
IO=6.0uA
VI=VIH or VIL
VCC=4.5V
VI=Vcc or GND;VCC=5.5V
VI=VIH or VIL;VCC=5.5V;
VO=VCC or GND
VI=VCC or GND;IO=0A;VCC=5.5V
per input pin;
nAn or inputs
VI=VCC-2.1V;
other inputs at VCC
nO� input
or GND;IO=0V;
VCC=4.5V to 5.5V
-
-
0.1
0.4
V
V
-
-
±1.0
μA
-
-
±10
μA
-
-
16
μA
-
-
735
μA
-
-
343
μA
AC Characteristics 1 (Tamb=25℃, voltages are referenced to GND(ground=0V),unless otherwise specified.)
Parameter
Symbol
Conditions
nAn to nYn
propagation
delay
tpd
see Figure5
nO� to nYn
enable time
ten
see Figure6
nO� to nYn
disable time
tdis
see Figure6
transition time
tt
see Figure5
power
dissipation
capacitance
CPD
Min.
Typ.
Max.
Unit
-
30
11
9
9
39
14
11
41
15
12
14
5
4
100
20
17
150
30
26
150
30
26
60
12
10
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
-
30
-
pF
VCC=4.5V
-
11
20
ns
VCC=5.0V;CL=15pF
-
9
-
ns
74HC240
VCC=2.0V
VCC=4.5V
VCC=5.0V;CL=15pF
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
per buffer;VI=GND to VCC
74HCT240
nAn to nYn
propagation
delay
nO� to nYn
enable time
nO� to nYn
disable time
transition time
power
dissipation
capacitance
XBLW version 1.0
tpd
see Figure5
ten
VCC=4.5V;see Figure6
-
13
30
ns
tdis
VCC=4.5V;see Figure6
-
13
25
ns
tt
VCC=4.5V;see Figure5
-
5
12
ns
CPD
per buffer;VI=GND to VCC -1.5V
-
30
-
pF
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第 8 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Note:
[1]tpd is the same as tPLH and tPHL.
[2]tt is the same as tTHL and tTLH.
[3]CPD is used to determine the dynamic power dissipation (PD in uW).
PD=CPD×VCC2×fi×N+∑(CL×VCC2×fo) where:
fi=input frequency in MHz;
fo=output frequency in MHz;
CL=output load capacitance in pF;
VCC=supply voltage in V;
N=number of inputs switching;
∑(CL×VCC2×f`)=sum of outputs.
AC Characteristics 2
(Tamb=40℃ to 85℃, voltages are referenced to GND(ground=0V),unless otherwise specified.)
Parameter
Symbol
Conditions
nAn to nYn
propagation delay
tpd
see Figure5
nO� to nYn enable
time
ten
see Figure6
nO� to nYn disable
time
tdis
see Figure6
transition time
tt
see Figure5
tpd
see Figure5
nAn to nYn
propagation delay
nO� to nYn enable
time
nO� to nYn disable
time
transition time
Note:
Min.
Typ.
Max.
Unit
74HC240
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
74HCT240
-
-
125
25
21
190
38
33
190
38
33
75
15
13
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
VCC=4.5V
-
-
25
ns
ten
VCC=4.5V;see Figure6
-
-
38
ns
tdis
VCC=4.5V;see Figure6
-
-
31
ns
tt
VCC=4.5V;see Figure5
-
-
15
ns
[1] tpd is the same as tPLH and tPHL.
[2] ten is the same as tPZL and tPZH.
XBLW version 1.0
文档仅供参考,实际应用测试为准
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第 9 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
[3] tdis is the same as tPLZ and tPHZ.
[4] tt is the same as tTHL and tTLH.
AC Characteristics 2
(Tamb=40℃ to 105℃, voltages are referenced to GND(ground=0V),unless otherwise specified.)
Parameter
Symbol
Conditions
nAn to nYn
propagation delay
tpd
see Figure5
nO� to nYn enable
time
ten
see Figure6
nO� to nYn disable
time
tdis
see Figure6
transition time
tt
see Figure5
tpd
see Figure5
nAn to nYn
propagation delay
nO� to nYn enable
time
nO� to nYn disable
time
transition time
Note:
Min.
Typ.
Max.
Unit
74HC240
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
VCC=2.0V
VCC=4.5V
VCC=6.0V
74HCT240
-
-
150
30
26
225
45
38
225
45
38
90
18
15
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
VCC=4.5V
-
-
30
ns
ten
VCC=4.5V;see Figure6
-
-
45
ns
tdis
VCC=4.5V;see Figure6
-
-
38
ns
tt
VCC=4.5V;see Figure5
-
-
18
ns
[1] tpd is the same as tPLH and tPHL.
[2] ten is the same as tPZL and tPZH.
[3] tdis is the same as tPLZ and tPHZ.
[4] tt is the same as tTHL and tTLH.
XBLW version 1.0
文档仅供参考,实际应用测试为准
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第 10 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Testing Circuit
AC Testing Circuit
Figure 4. Test circuit for measuring switching times
Definitions for test circuit:
CL=Load capacitance including jig and probe capacitance.
RT=Termination resistance should be equal to the output impedance Zo of the pulse generator.
RL=Load resistance
S1=Test selection switch
AC Testing Waveforms
XBLW version 1.0
文档仅供参考,实际应用测试为准
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第 11 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Figure 5. Input (nAn) to output (nYn) propagation delays and output transition times
Figure 6. 3-state enable and disable times
Measurement Points
Type
74HC240
74HCT240
Input
VM
0.5×VCC
1.3V
VM
0.5×VCC
1.3V
Output
VM
0.1×VCC
0.1×VCC
VY
0.9×VCC
0.9×VCC
Test Data
XBLW version 1.0
文档仅供参考,实际应用测试为准
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第 12 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Type
Input
Load
S1 position
tPZH,tPHZ
VI
tr,tf
CL
RL
tPHL,tPLH
tPZL,tPLZ
74HC240
VCC
6.0ns
15pF,50pF
1KΩ
open
GND
VCC
74HCT240
3.0V
6.0ns
15pF,50pF
1KΩ
open
GND
VCC
Package Information
DIP20
Symbol
A
A1
A2
XBLW version 1.0
Dimensions In Millimeters
Min
Max
3.710
4.310
0.510
3.200
3.600
Dimensions In Inches
Min
Max
0.146
0.170
0.020
0.126
0.142
文档仅供参考,实际应用测试为准
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第 13 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
B
B1
C
D
E
E1
e
L
E2
0.380
0.570
0.015
1.524(BSC)
0.204
18.800
6.200
7.320
0.060(BSC)
0.360
19.200
6.600
7.920
0.008
0.740
0.244
0.288
2.540(BSC)
3.000
8.400
0.022
0.014
0.756
0.260
0.312
0.100(BSC)
3.600
9.000
0.118
0.331
0.142
0.354
SOP20
Symbol
XBLW version 1.0
Dimensions In Millimeters
Min
Max
Dimens ons
Min
文档仅供参考,实际应用测试为准
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In Inches
Max
第 14 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
A
A1
A2
b
C
D
E
E1
e
L
2.350
0.100
2.100
0.330
0.204
12.520
7.400
10.210
2.650
0.300
2.500
0.510
0.330
13.000
7.600
10.610
0.093
0.004
0.083
0.013
0.008
0.493
0.291
0.402
0.400
1.270
0.016
0.050
θ
0°
8°
0°
8°
1.270(BSC)
0.104
0.012
0.098
0.020
0.013
0.512
0.299
0.418
0.050(BSC)
TSSOP20
Symbol
XBLW version 1.0
Dimensions In Millimeters
Min
Max
Dimensions In Inches
Min
Max
文档仅供参考,实际应用测试为准
www.xinboleic.com 技术支持热线:4009682003
第 15 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
D
E
b
c
E1
A
A2
A1
e
L
H
6.400
4. 300
0.190
0.090
6.250
θ
1°
6.600
4. 500
0.300
0.200
6. 550
1. 200
1.000
0.150
0. 800
0.050
0. 252
0.169
0.007
0.004
0. 246
0.031
0.002
0.65(BSC)
0. 500
0. 259
0.177
0.012
0.008
0.258
0.047
0.039
0.006
0.026(BSC)
0.700
0.020
0.25(TYP)
0.028
0.01(TYP)
7°
1°
7°
Statements And Notes
Part name
Lead and
lead
compounds
Lead frame
○
Plastic resin
○
○
○
○
○
○
Chip
○
○
○
○
○
The lead
Plastic sheet
installed
○
○
○
○
○
○
○
○
explanation
Cadmium
and
cadmium
compounds
○
Hazardous substances or Elements
Polybro
Hexavalent
Polybro
minated
Dibutyl
chromium
minated
phthalate
biphenyl
compounds biphenyls
ethers
○
○
○
○
Mercury
and
mercury
compounds
○
Butyl
benzyl
phthalate
Di-2ethylhexyl
phthalate
Diisobutyl
phthalate
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○
○: Indicates that the content of hazardous substances or elements in the detection limit of the following the SJ/T11363-2006 standard.
×: Indicates that the content of hazardous substances or elements exceeding the SJ/T11363-2006 Standard limit requirements
Statement:
XBLW version 1.0
文档仅供参考,实际应用测试为准
www.xinboleic.com 技术支持热线:4009682003
第 16 页 共 17 页
XBLW 74HC/HCT240
Octal Buffers and Line Drivers With 3-State Outputs
Shenzhen xinbole electronics co., ltd. reserves the right to change the product specifications, without notice!
Before placing an order, the customer needs to confirm whether the information obtained is the latest version,
and verify the integrity of the relevant information.
Any semiconductor product is liable to fail or malfunction under certain conditions, and the buyer shall be
responsible for complying with safety standards in the system design and whole machine manufacturing using
Shenzhen xinbole electronics co., ltd products, and take appropriate security measures to avoid the potential risk
of failure may result in personal injury or property losses of the situation occurred!
Product performance is never ending, Shenzhen xinbole electronics co., ltd will be dedicated to provide
customers with better performance, better quality of integrated circuit products.
XBLW version 1.0
文档仅供参考,实际应用测试为准
www.xinboleic.com 技术支持热线:4009682003
第 17 页 共 17 页
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