74ACT244T [STMICROELECTRONICS]
OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED; 具有三态输出非反相八路总线缓冲器
| 型号： | 74ACT244T |
| 厂家： | 
ST |
| 描述： | OCTAL BUS BUFFER WITH 3 STATE OUTPUTS NON INVERTED |
| 文件： | 总9页 (文件大小：72K) |
| 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:tPD =4.5ns (TYP.) atVCC = 5V
LOW POWER DISSIPATION:
CC =8 µA (MAX.) at TA =25 oC
I
M
■
■
■
■
■
■
■
COMPATIBLEWITH TTL OUTPUTS
VIH =2V (MIN), VIL = 0.8V(MAX)
50Ω TRANSMISSIONLINEDRIVING
CAPABILITY
SYMMETRICAL OUTPUT IMPEDANCE:
|IOH| = IOL = 24 mA (MIN)
BALANCEDPROPAGATIONDELAYS:
tPLH tPHL
OPERATING VOLTAGERANGE:
(Micro Package)
B
(Plastic Package)
ORDER CODES :
74ACT244B
T
(TSSOP Package)
74ACT244M
74ACT244T
G control output governs four BUS BUFFERs.
This device is desibned to be used with 3 state
memory address drivers, etc.
The device is designed to interface directly High
Speed CMOS systems with TTL, NMOS and
CMOS output voltage levels.
VCC (OPR)= 4.5V to 5.5V
PIN AND FUNCTION COMPATIBLEWITH
74 SERIES244
IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The ACT244 is an advanced CMOS OCTAL BUS
BUFFER (3-STATE) fabricated with sub-micron
silicon gate and double-layermetal wiring C2MOS
technology. It is ideal for low power applications
mantaining high speed operation similar to
equivalentBipolar Schottky TTL.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/9
February 1999
74ACT244
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
SYMBOL NAME AND FUNCTION
1G Output Enable Input
2,4,6,8
9,7,5,3
1A1to1A4 Data Inputs
2Y1to2Y4 Data Outputs
11,13, 15,17 2A1to2A4 Data Inputs
18,16, 14,12 1Y1to1Y4 Data Outputs
19
10
20
2G
GND
VCC
Output Enabel Input
Ground (0V)
Positive Supply Voltage
TRUTH TABLE
INPUT
OUTPUT
G
L
An
L
Yn
L
L
H
H
H
X:”H” or”L”
X
Z
Z:Highimpedance
ABSOLUTE MAXIMUM RATINGS
Symbol
Parameter
Value
-0.5to+7
Unit
VCC
VI
Supply Voltage
V
V
DC Input Voltage
DC Output Voltage
DC Input Diode Current
-0.5toVCC +0.5
-0.5toVCC +0.5
± 20
VO
IIK
V
mA
mA
mA
mA
oC
oC
IOK
IO
DC Output Diode Current
DC Output Current
± 20
± 50
ICC orIGND DC VCC or Ground Current
± 400
Tstg
Storage Temperature
-65to+150
300
TL
Lead Temperature (10 sec)
AbsoluteMaximum Ratingsarethose values beyond whichdamage tothe device may occur. Functional operation under these condition isnot implied.
RECOMMENDED OPERATING CONDITIONS
Symbol
VCC
VI
Parameter
Value
4.5to5.5
0toVCC
0toVCC
-40to+85
8
Unit
V
Supply Voltage
Input Voltage
V
VO
Output Voltage
V
oC
Top
Operating Temperature:
dt/dv
Input Rise and Fall Time VCC = 4.5 to 5.5V (note 1)
ns/V
1)VIN from0.8V to2.0V
2/9
74ACT244
DC SPECIFICATIONS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
-40 to 85 oC
VIH
VIL
High Level Input Voltage
Low Level Input Voltage
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
4.5
5.5
5.5
5.5
VO =0.1V or
VCC -0.1V
2.0
2.0
1.5
1.5
2.0
2.0
V
V
V
VO =0.1V or
1.5
0.8
0.8
0.8
0.8
VCC -0.1V
1.5
VOH
High Level Output
Voltage
I =-50 A
O
4.4
5.4
4.49
5.49
4.4
5.4
µ
V(*)
=
I
IO=-50µA
IO=-24 mA
IO=-24 mA
IO=50µA
VIHor
V
3.86
4.86
3.76
4.76
IL
VOL
Low Level Output
Voltage
0.001
0.001
0.1
0.1
0.1
0.1
0.44
0.44
±1
V(*)
=
V
I
IO=50mA
IO=24mA
IO=24mA
VIHor
V
0.36
0.36
±0.1
±0.5
IL
II
Input Leakage Current
VI = VCC orGND
µA
µA
IOZ
3 State Output Leakage
Current
VI =VIHorVIL
VO = VCC orGND
±5
ICCT
ICC
Max ICC /Input
5.5
5.5
V =VCC -2.1V
0.6
1.5
80
mA
I
Quiescent Supply
Current
VI = VCC orGND
8
µA
IOLD
IOHD
Dynamic Output Current
(note 1, 2)
5.5
VOLD = 1.65V max
VOHD =3.85V min
75
mA
mA
-75
1) Maximum test duration 2ms, one output loaded attime
2)Incident wave switchingis guaranteed ontransmission lines withimpedances aslowas50 Ω.
(*) All outputs loaded.
3/9
74ACT244
AC ELECTRICAL CHARACTERISTICS (CL = 50 pF, RL = 500 Ω, Input tr = t =3 ns)
f
Symbol
Parameter
Test Condition
Value
TA = 25 oC
Min. Typ. Max. Min. Max.
Unit
VCC
(V)
-40 to 85 oC
(*)
tPLH
tPHL
tPZL
tPZH
tPLZ
tPHZ
Propagation Delay Time
5.0
1.5
4.5
9.0
1.5
10.0
ns
(*)
Output Enable Time
Output Disable Time
5.0
1.5
1.5
5.5
6.5
9.0
1.5
1.5
10.0
11.0
ns
ns
(*)
5.0
10.0
(*)Voltage range is5V ± 0.5V
CAPACITIVE CHARACTERISTICS
Symbol
Parameter
Test Conditions
Value
TA = 25 oC
Unit
VCC
-40 to 85 oC
(V)
Min. Typ. Max. Min. Max.
CIN
Ci/o
CPD
Input Capacitance
I/O Capacitance
4
8
5.0
5.0
5.0
pF
pF
pF
Power Dissipation
24
Capacitance (note 1)
1)CPD isdefined as thevalue ofthe IC’sinternal equivalent capacitance whichiscalculated fromthe operating current consumption without load. (Referto
TestCircuit).Average operating current can beobtained bythe followingequation. ICC(opr)= CPD • VCC • fIN + ICC/n(per circuit)
TEST CIRCUIT
TEST
SWITCH
Open
tPLH, tPHL
tPZL, tPLZ
tPZH, tPHZ
2VCC
Open
CL = 50 pF or equivalent (includes jigand probe capacitance)
RL =R1 =500Ω orequivalent
RT = ZOUT ofpulse generator (typically50Ω)
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
0.335
0.100
0.900
2.54
22.86
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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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. Specification 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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9/9
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