M74HCT240RM13TR [STMICROELECTRONICS]
OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED); 具有三态输出八路总线缓冲器（反相）
| 型号： | M74HCT240RM13TR |
| 厂家： | 
ST |
| 描述： | OCTAL BUS BUFFER WITH 3 STATE OUTPUTS (INVERTED) |
| 文件： | 总9页 (文件大小：199K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
M74HCT240
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (INVERTED)
■
■
■
■
■
■
HIGH SPEED:
= 15 ns (TYP.) at V = 4.5V
t
PD
CC
LOW POWER DISSIPATION:
= 4µA(MAX.) at T =25°C
I
CC
A
COMPATIBLE WITH TTL OUTPUTS :
= 2V (MIN.) V = 0.8V (MAX)
V
IH
IL
DIP
SOP
TSSOP
BALANCED PROPAGATION DELAYS:
t
t
PLH
PHL
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 6mA (MIN)
ORDER CODES
PACKAGE
OH
OL
TUBE
T & R
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 240
DIP
SOP
M74HCT240B1R
M74HCT240M1R M74HCT240RM13TR
M74HCT240TTR
TSSOP
DESCRIPTION
The 74HCT240 is an advanced high-speed
CMOS OCTAL BUS BUFFER (3-STATE)
fabricated with silicon gate C MOS technology.
All inputs are equipped with protection circuits
against static discharge and transient excess
voltage.
2
G control input governs four BUS BUFFERs.
PIN CONNECTION AND IEC LOGIC SYMBOLS
August 2001
1/9
M74HCT240
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
SYMBOL
1G
NAME AND FUNCTION
1
Output Enable Input
2, 4, 6, 8
9, 7, 5, 3
1A1 to 1A4 Data Inputs
2Y1 to 2Y4 Data Outputs
2A1 to 2A4 Data Inputs
11, 13, 15,
17
18, 16, 14,
12
1Y1 to 1Y4 Data Outputs
19
10
20
2G
Output Enable Input
GND
Ground (0V)
V
Positive Supply Voltage
CC
TRUTH TABLE
INPUTS
OUTPUT
Yn
G
An
L
L
L
H
X
H
L
H
Z
X : Don’t Care
Z : High Impedance
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7
V
V
CC
V
DC Input Voltage
-0.5 to V + 0.5
I
CC
V
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
-0.5 to V + 0.5
V
O
CC
I
± 20
± 20
mA
mA
mA
mA
mW
°C
IK
I
OK
I
± 35
O
I
or I
DC V
or Ground Current
CC
± 70
CC
GND
P
Power Dissipation
500(*)
-65 to +150
300
D
T
Storage Temperature
Lead Temperature (10 sec)
stg
T
°C
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
(*) 500mW at 65 °C; derate to 300mW by 10mW/°C from 65°C to 85°C
RECOMMENDED OPERATING CONDITIONS
Symbol
Parameter
Value
Unit
V
Supply Voltage
4.5 to 5.5
V
V
CC
V
Input Voltage
0 to V
I
CC
V
Output Voltage
0 to V
V
O
CC
T
Operating Temperature
-55 to 125
0 to 500
°C
ns
op
t , t
Input Rise and Fall Time (V = 4.5 to 5.5V)
CC
r
f
2/9
M74HCT240
DC SPECIFICATIONS
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
T
= 25°C
Symbol
Parameter
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
V
High Level Input
Voltage
4.5
to
IH
2.0
2.0
2.0
V
5.5
V
Low Level Input
Voltage
4.5
to
IL
0.8
0.1
0.8
0.8
V
V
5.5
V
High Level Output
Voltage
I =-20 µA
4.4
4.5
4.4
4.4
OH
O
4.5
I =-6.0 mA
4.18 4.31
0.0
4.13
4.10
O
V
Low Level Output
Voltage
I =20 µA
0.1
0.1
OL
O
4.5
5.5
V
I =6.0 mA
0.17 0.26
0.33
0.40
O
I
Input Leakage
Current
I
V = V
or GND
CC
± 0.1
± 1
± 1
µA
I
I
I
High Impedance
Output Leakage
Current
OZ
V = V or V
IL
I
IH
5.5
± 0.5
± 5
± 10
µA
V
= V or GND
CC
O
Quiescent Supply
Current
CC
V = V
or GND
CC
5.5
5.5
4
40
80
µA
I
∆ I
Additional Worst
Case Supply
Current
Per Input pin
V = 0.5V or
2.0
2.9
3.0
mA
CC
I
V = 2.4V
I
Other Inputs at
V
or GND
CC
AC ELECTRICAL CHARACTERISTICS (C = 50 pF, Input t = t = 6ns)
L
r
f
Test Condition
Value
T
= 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
C
L
CC
(V) (pF)
Min. Typ. Max. Min. Max. Min. Max.
t
t
Output Transition
Time
TLH THL
4.5
50
7
12
15
18
ns
ns
ns
ns
t
t
Propagation Delay
Time
4.5
4.5
4.5
4.5
50
150
50
15
21
17
23
22
30
30
38
28
38
38
48
33
45
45
57
PLH PHL
t
t
Output Enable
Time
PZL PZH
R = 1 KΩ
L
150
t
t
Output Disable
Time
PLZ PHZ
R = 1 KΩ
4.5
50
16
30
38
45
L
3/9
M74HCT240
CAPACITIVE CHARACTERISTICS
Test Condition
Value
T
= 25°C
Symbol
Parameter
-40 to 85°C -55 to 125°C Unit
A
V
CC
(V)
Min. Typ. Max. Min. Max. Min. Max.
C
Input Capacitance
5
10
10
10
pF
pF
IN
Output
Capacitance
C
10
OUT
C
Power Dissipation
Capacitance (note
1)
PD
33
pF
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
PD
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
= C x V x f + I /8 (per circuit)
CC(opr)
PD CC IN CC
TEST CIRCUIT
TEST
SWITCH
t
t
t
, t
Open
PLH PHL
, t
V
CC
PZL PLZ
, t
GND
PZH PHZ
C
R
R
= 50pF/150pF or equivalent (includes jig and probe capacitance)
= 1KΩ or equivalent
L
1
T
= Z
of pulse generator (typically 50Ω)
OUT
4/9
M74HCT240
WAVEFORM 1 : PROPAGATION DELAY TIMES (f=1MHz; 50% duty cycle)
WAVEFORM 2 : OUTPUT AND ENABLE TIMES (f=1MHz; 50% duty cycle)
5/9
M74HCT240
Plastic DIP-20 (0.25) MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
0.254
1.39
MAX.
MIN.
0.010
0.055
MAX.
a1
B
b
1.65
0.065
0.45
0.25
0.018
0.010
b1
D
E
e
25.4
1.000
8.5
2.54
22.86
0.335
0.100
0.900
e3
F
7.1
0.280
0.155
I
3.93
L
3.3
0.130
Z
1.34
0.053
P001J
6/9
M74HCT240
SO-20 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
2.65
0.2
MIN.
MAX.
0.104
0.008
0.096
0.019
0.012
A
a1
a2
b
0.1
0.004
2.45
0.49
0.32
0.35
0.23
0.014
0.009
b1
C
0.5
0.020
c1
D
45° (typ.)
12.60
10.00
13.00
10.65
0.496
0.393
0.512
0.419
E
e
1.27
0.050
0.450
e3
F
11.43
7.40
0.50
7.60
1.27
0.75
0.291
0.020
0.300
0.050
0.029
L
M
S
8° (max.)
PO13L
7/9
M74HCT240
TSSOP20 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.2
MIN.
MAX.
0.047
0.006
0.041
0.012
0.0089
0.260
0.260
0.176
A
A1
A2
b
0.05
0.8
0.15
1.05
0.30
0.20
6.6
0.002
0.031
0.007
0.004
0.252
0.244
0.169
0.004
0.039
1
0.19
0.09
6.4
c
D
6.5
6.4
0.256
0.252
E
6.2
6.6
E1
e
4.3
4.4
4.48
0.173
0.65 BSC
0.0256 BSC
K
0°
8°
0°
8°
L
0.45
0.60
0.75
0.018
0.024
0.030
A2
A
K
L
b
e
A1
E
c
D
E1
PIN 1 IDENTIFICATION
1
0087225C
8/9
M74HCT240
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the
consequences of use of such information nor for any infringement of patents or other rights of third parties which may result from
its use. No license is granted by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications
mentioned in this publication are subject to change without notice. This publication supersedes and replaces all information
previously supplied. STMicroelectronics products are not authorized for use as critical components in life support devices or
systems without express written approval of STMicroelectronics.
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© 2001 STMicroelectronics - Printed in Italy - All Rights Reserved
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9/9
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