74ACT244TTR [ETC]
Dual 4-Bit Non-Inverting Buffer/Driver ; 双4位非反相缓冲器/驱动器\n
| 型号： | 74ACT244TTR |
| 厂家： | 
ETC |
| 描述： | Dual 4-Bit Non-Inverting Buffer/Driver
|
| 文件： | 总9页 (文件大小：71K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74ACT244
OCTAL BUS BUFFER
WITH 3 STATE OUTPUTS (NON INVERTED)
■
■
HIGH SPEED: t = 4.6 ns (TYP.) at V = 5V
PD CC
LOW POWER DISSIPATION:
I
= 4 µA(MAX.) at T =25°C
CC
A
■
■
■
■
■
■
■
COMPATIBLE WITH TTL OUTPUTS
= 2V (MIN.), V = 0.8V (MAX.)
50Ω TRANSMISSION LINE DRIVING
V
IH
IL
DIP
SOP
TSSOP
T & R
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|I | = I = 24mA (MIN)
OH
OL
BALANCED PROPAGATION DELAYS:
ORDER CODES
PACKAGE
t
t
PLH
PHL
TUBE
OPERATING VOLTAGE RANGE:
(OPR) = 4.5V to 5.5V
DIP
SOP
74ACT244B
74ACT244M
V
CC
74ACT244MTR
74ACT244TTR
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 244
IMPROVED LATCH-UP IMMUNITY
TSSOP
memory address drivers, etc.
DESCRIPTION
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
The 74ACT244 is an advanced high-speed CMOS
OCTAL BUS BUFFER (3-STATE) fabricated with
sub-micron silicon gate and double-layer metal
2
wiring C MOS tecnology.
The G input controls four BUS BUFFERs.
This device is designed to be used with 3 state
PIN CONNECTION AND IEC LOGIC SYMBOLS
April 2001
1/9
74ACT244
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
L
H
Z
H
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
CC
V
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
-0.5 to V
+ 0.5
V
O
I
± 20
± 20
mA
mA
mA
mA
°C
°C
IK
I
OK
I
± 50
O
I
or I
DC V
or Ground Current
CC
± 400
CC
GND
T
Storage Temperature
-65 to +150
300
stg
T
Lead Temperature (10 sec)
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied.
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
Input Rise and Fall Time V
-55 to 125
8
°C
ns/V
op
= 4.5 to 5.5V (note 1)
dt/dv
CC
1) V from 0.8V to 2.0V
IN
2/9
74ACT244
DC SPECIFICATIONS
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.
V
High Level Input
Voltage
4.5
5.5
4.5
5.5
4.5
V
V
= 0.1 V or
O
2.0
2.0
1.5
1.5
2.0
2.0
2.0
2.0
IH
V
-0.1V
V
V
CC
V
Low Level Input
Voltage
= 0.1 V or
O
1.5
0.8
0.8
0.8
0.8
0.8
0.8
IL
V
-0.1V
1.5
CC
V
High Level Output
Voltage
I =-50 µA
4.4
5.4
4.49
4.4
5.4
4.4
5.4
3.7
4.7
OH
O
I =-50 µA
5.5
4.5
5.5
4.5
5.5
4.5
5.5
5.49
O
I =-24 mA
3.86
4.86
3.76
4.76
O
I =-24 mA
O
V
Low Level Output
Voltage
I =50 µA
0.001 0.1
0.001 0.1
0.36
0.1
0.1
0.1
0.1
0.5
0.5
OL
O
V
I =50 µA
O
I =24 mA
0.44
0.44
O
I =24 mA
0.36
O
I
Input Leakage Cur-
rent
I
V = V
or GND
CC
5.5
± 0.1
± 1
± 1
µA
µA
I
I
High Impedance
Output Leakege
Current
OZ
V = V or V
IL
I
IH
5.5
± 0.5
± 2.5
± 5
V
= V or GND
CC
O
I
Max I /Input
V = V - 2.1V
5.5
5.5
0.6
1.5
40
1.6
80
mA
CCT
CC
I
CC
I
Quiescent Supply
Current
CC
V = V
or GND
CC
4
µA
I
I
V
= 1.65 V max
= 3.85 V min
75
50
mA
mA
OLD
OLD
Dynamic Output
Current (note 1, 2)
5.5
I
V
OHD
-75
-50
OHD
1) Maximum test duration 2ms, one output loaded at time
2) Incident wave switching is guaranteed on transmission lines with impedances as low as 50Ω
AC ELECTRICAL CHARACTERISTICS (C = 50 pF, R = 500 Ω, Input t = t = 3ns )
L
L
r
f
Test Condition
Value
-40 to 85°C -55 to 125°C Unit
Min. Typ. Max. Min. Max. Min. Max.
T
= 25°C
Symbol
Parameter
A
V
CC
(V)
t
t
Propagation Delay
Time
PLH PHL
(*)
1.5
1.5
1.5
4.6
5.7
6.4
9.0
9.5
1.5
1.5
1.5
10.0
10.5
11.0
1.5
1.5
1.5
11
11
ns
ns
ns
5.0
5.0
5.0
t
t
t
Output Enable
Time
PZL PZH
(*)
(*)
t
Output Disable
Time
PLZ PHZ
10.0
11.5
(*) Voltage range is 5.0V ± 0.5V
3/9
74ACT244
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
5.0
5.0
4
pF
pF
IN
Output
Capacitance
C
8
OUT
C
Power Dissipation
Capacitance (note
1)
PD
f
= 10MHz
5.0
24
pF
IN
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 xV x f +I /n (per circuit)
PD CC IN CC
CC(opr)
TEST CIRCUIT
TEST
SWITCH
t
t
t
, t
Open
PLH PHL
, t
2V
CC
PZL PLZ
, t
Open
PZH PHZ
C
R
R
= 50pF or equivalent (includes jig and probe capacitance)
L
L
T
= R = 500Ω or equivalent
1
= Z
of pulse generator (typically 50Ω)
OUT
4/9
74ACT244
WAVEFORM 1: PROPAGATION DELAYS (f=1MHz; 50% duty cycle)
WAVEFORM 2: OUTPUT ENABLE AND DISABLE TIME (f=1MHz; 50% duty cycle)
5/9
74ACT244
Plastic DIP-20 (0.25) MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
0.254
1.39
TYP.
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
74ACT244
SO-20 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
2.65
0.20
2.45
0.49
0.32
MIN.
MAX.
0.104
0.007
0.096
0.019
0.012
A
a1
a2
b
0.10
0.004
0.35
0.23
0.013
0.009
b1
C
0.50
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
0.19
0.299
0.050
0.029
L
M
S
8 (max.)
P013L
7/9
74ACT244
TSSOP20 MECHANICAL DATA
mm
inch
TYP.
DIM.
MIN.
TYP.
MAX.
1.1
MIN.
MAX.
0.433
0.006
0.374
0.0118
0.0079
0.260
0.256
0.176
A
A1
A2
b
0.05
0.85
0.19
0.09
6.4
0.10
0.9
0.15
0.95
0.30
0.2
0.002
0.335
0.0075
0.0035
0.252
0.246
0.169
0.004
0.354
c
D
6.5
6.4
6.6
0.256
0.252
E
6.25
4.3
6.5
E1
e
4.4
4.48
0.173
0.65 BSC
4o
0.0256 BSC
4o
K
0o
8o
0o
8o
L
0.50
0.60
0.70
0.020
0.024
0.028
A2
A
K
L
b
e
A1
E
c
D
E1
PIN 1 IDENTIFICATION
1
8/9
74ACT244
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consequences of use of such information nor for any infringement of patents or other rights of third parties which may resultfrom
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.
The ST logo is a registered trademark of STMicroelectronics
2001 STMicroelectronics - Printed in Italy - All Rights Reserved
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9/9
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