UNISONIC TECHNOLOGIES CO., LTD
U74AHCT125
QUADRUPLE BUS BUFFER
GATES WITH 3-STATE
OUTPUTS
DESCRIPTION
The U74AHCT125 is a quadruple bus buffer gates with 3-state
output. When
OE
is high, the Y output is in a high-impedance
state. When
OE
is low, the device passes noninverted data from
the A input to the Y output.
To ensure the high-impedance state during power up or power
down,
OE
should be tied to V
CC
through a pull-up resistor; the
minimum value of the resistor is determined by the current-sinking
capability of the driver.
CMOS IC
FEATURES
* TTL-Voltage Compatible
* Max t
PD
of 3.8ns from A to Y at 5V, C
L
=15pF
* Low Quiescent Current: I
CC
= 2
μA
(Max) at 5.5V
* ±8 mA Output Driver at 5V
ORDERING INFORMATION
Ordering Number
Lead Free
U74AHCT125L-P14-R
U74AHCT125L-P14-T
U74AHCT125L-S14-R
U74AHCT125L-S14-T
Halogen Free
U74AHCT125G-P14-R
U74AHCT125G-P14-T
U74AHCT125G-S14-R
U74AHCT125G-S14-T
Package
TSSOP-14
TSSOP-14
SOP-14
SOP-14
Packing
Tape Reel
Tube
Tape Reel
Tube
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QW-R502-670.B
U74AHCT125
PIN CONFIGURATION
CMOS IC
FUNCTION TABLE
INPUTS
OE
A
H
L
X
OUTPUTS
Y
H
L
Z
L
L
H
LOGIC DIAGRAM
OE
A
Y
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U74AHCT125
ABSOLUTE MAXIMUM RATING
PARAMETER
CMOS IC
SYMBOL
RATINGS
UNIT
Supply Voltage
V
CC
-0.5~7
V
Input Voltage
V
IN
-0.5~7
V
Output Voltage
V
OUT
-0.5~V
CC
+0.5
V
Input Clamp Current (V
IN
<0)
I
IK
-20
mA
Output Clamp Current (V
OUT
<0, or V
OUT
>V
CC
)
I
OK
±20
mA
Output Current
I
OUT
±25
mA
V
CC
or GND Current
I
CC
±50
mA
Storage Temperature
T
STG
-65 ~ +150
°C
Note: 1. The input and output voltage ratings may be exceeded if the input and output current ratings are observed.
2. Absolute maximum ratings are those values beyond which the device could be permanently damaged.
Absolute maximum ratings are stress ratings only and functional device operation is not implied.
RECOMMENDED OPERATING COMDITIONS
PARAMETER
Supply Voltage
High-Level Input Voltage
Low-Level Input Voltage
Input Voltage
Output Voltage
High-level Output Current
Low-level Output Current
Input Transition Rise or Fall Rate
Operating Temperature
SYMBOL
V
CC
V
IH
V
IL
V
IN
V
OUT
I
OH
I
OL
Δt/Δv
T
A
RATINGS
4.5 ~ 5.5
2
0.8
0
~
5.5
0
~
V
CC
-8
8
20
-40
~
85
UNIT
V
V
V
V
V
mA
mA
ns/V
°C
ELECTRICAL CHARACTERISTICS
(T
A
=25°C , unless otherwise specified)
PARAMETER
High-Level Output Voltage
Low-Level Output Voltage
Input Leakage Current
(A or
OE
input)
High-impedance state Current
Quiescent Supply Current
Additional quiescent supply current
Input Capacitance
Output Capacitance
SYMBOL
V
OH
V
OL
I
I(LEAK)
I
OZ
I
CC
ΔI
CC
C
IN
C
OUT
TEST CONDITIONS
I
OH
= -50
μA,
V
CC
= 4.5V
I
OH
= -8 mA, V
CC
= 4.5V
I
OH
= 50
μA,
V
CC
= 4.5V
I
OH
= 8 mA, V
CC
= 4.5V
V
IN
= 5.5V or GND, V
CC
= 0 to 5.5V
V
OUT
= V
CC
or GND, V
CC
= 5.5V
V
IN
= V
CC
or GND, I
OUT
= 0, V
CC
= 5.5V
One input at 3.4V,other inputs at V
CC
or GND
MIN TYP MAX UNIT
4.4
4.5
V
3.94
0.1
V
0.36
±0.1
±0.25
2
1.35
10
μA
μA
μA
mA
pF
pF
V
IN
= V
CC
or GND, V
CC
=5V
V
OUT
= V
CC
or GND, V
CC
=5V
4
15
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U74AHCT125
SWITCHING CHARACTERISTICS
(V
CC
= 5V ± 0.5V, T
A
=25°C)
PARAMETER
Propagation Delay from Input A to
Output Y, t
PD
SYMBOL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
TEST CONDITIONS
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
C
L
=15pF, R
L
=1kΩ
C
L
=50pF, R
L
=1kΩ
MIN
CMOS IC
Propagation Delay from Input
OE
to
Output Y, t
EN
Propagation Delay from Input
OE
to
Output Y, t
DIS
TYP
3.8
5.3
3.8
5.3
3.6
5.1
3.6
5.1
4.6
6.1
4.6
6.1
MAX UNIT
5.5
ns
7.5
5.5
ns
7.5
5.1
ns
7.1
5.1
ns
7.1
6.8
ns
8.8
6.8
ns
8.8
OPERATING CHARACTERISTICS
(T
A
=25°C)
PARAMETER
Power Dissipation Capacitance
SYMBOL
TEST CONDITIONS
C
PD
V
CC
= 5V, f=1MHz, No load
RATINGS
14
UNIT
pF
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U74AHCT125
TEST CIRCUIT AND WAVEFORMS
CMOS IC
TEST
t
PLH
/t
PHL
t
PLZ
/t
PZL
t
PHZ
/t
PZH
S1
Open
V
LOAD
GND
V
CC
5V±0.5V
Input
V
IN
V
CC
t
R
, t
F
≤3ns
V
M
V
CC
/2
V
LOAD
V
CC
C
L
15pF
50pF
R
L
1kΩ
V
Δ
0.5V
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