ETC HD74HCT125/HD74HCT126

HD74HCT125/HD74HCT126
Quad. Bus Buffer Gates (with 3-state outputs)
ADE-205-545 (Z)
1st. Edition
Sep. 2000
Description
The HD74HCT125, HD74HCT126 require the 3-state control input C to be taken high to put the output
into the high impedance condition, whereas the HD74HCT125, HD74HCT126 requires the control input to
be low to put the output into high impedance.
Features
•
•
•
•
•
•
LSTTL Output Logic Level Compatibility as well as CMOS Output Compatibility
High Speed Operation: tpd (A to Y) = 12 ns typ (CL = 50 pF)
High Output Current: Fanout of 15 LSTTL Loads
Wide Operating Voltage: VCC = 4.5 to 5.5 V
Low Input Current: 1 µA max
Low Quiescent Supply Current: ICC (static) = 4 µA max (Ta = 25°C)
Function Table
Input
C
Output Y
HCT125
HCT126
A
HD74HCT125
HD74HCT126
H
L
X
Z
Z
L
H
L
L
L
L
H
H
H
H
Notes: X: Irrelevant
Z: Off (High-impedance) state of a 3-state output.
HD74HCT125/HD74HCT126
Pin Arrangement
HD74HCT125
1C
1
14
VCC
1A
2
13
4C
1Y
3
12
4A
2C
4
11
4Y
2A
5
10
3C
2Y
6
9
3A
GND
7
8
3Y
(Top view)
HD74HCT126
1C
1
14
VCC
1A
2
13
4C
1Y
3
12
4A
2C
4
11
4Y
2A
5
10
3C
2Y
6
9
3A
GND
7
8
3Y
(Top view)
2
HD74HCT125/HD74HCT126
Absolute Maximum Ratings
Item
Symbol
Rating
Unit
Supply voltage range
VCC
–0.5 to +7.0
V
Input voltage
VIN
–0.5 to VCC + 0.5
V
Output voltage
VOUT
–0.5 to VCC + 0.5
V
Output current
I OUT
±35
mA
DC current drain per VCC, GND
I CC, I GND
±75
mA
DC input diode current
I IK
±20
mA
DC output diode current
I OK
±20
mA
Power dissipation per package
PT
500
mW
Storage temperature
Tstg
–65 to +150
°C
DC Characteristics
Ta = –40 to
+85°C
Ta = 25°C
Test Conditions
Item
Symbol
Min Typ Max Min
Max
Unit
VCC (V)
Input voltage
VIH
2.0
—
—
—
V
4.5 to
5.5
VIL
—
—
0.8 —
0.8
V
4.5 to
5.5
VOH
4.4
—
—
4.4
—
V
4.5
Vin = VIH or VIL I OH = –20 µA
4.18 —
—
4.13
—
4.5
I OH = –6 mA
—
—
0.1 —
0.1
—
—
0.26 —
0.33
Output voltage
VOL
2.0
V
4.5
Vin = VIH or VIL I OL = 20 µA
4.5
I OL = 6 mA
Off-state output
current
I OZ
—
—
±0.5 —
±5.0
µA
5.5
Vin = VIH or VIL,
Vout = VCC or GND
Input current
Iin
—
—
±0.1 —
±1.0
µA
5.5
Vin = VCC or GND
Quiescent supply
current
I CC
—
—
4.0 —
40
µA
5.5
Vin = VCC or GND, Iout = 0 µA
3
HD74HCT125/HD74HCT126
AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)
Ta = –40 to
+85°C
Ta = 25°C
Test Conditions
Min Typ Max Min
Max
Unit
VCC (V)
Propagation delay t PHL
—
12
20
—
25
ns
4.5
time
t PLH
—
12
20
—
25
Output enable
t ZL
—
12
30
—
38
time
t ZH
—
12
30
—
38
Output disable
t LZ
—
15
30
—
38
time
t HZ
—
15
30
—
38
Output rise/fall
t TLH
—
4
12
—
15
time
t THL
—
4
12
—
15
Input capacitance
Cin
—
5
10
—
10
Item
4
Symbol
4.5
ns
4.5
4.5
ns
4.5
4.5
ns
4.5
4.5
pF
—
HD74HCT125/HD74HCT126
Package Dimensions
Unit: mm
19.20
20.32 Max
8
6.30
7.40 Max
14
1.30
7
2.54 ± 0.25
0.48 ± 0.10
0.51 Min
2.39 Max
7.62
2.54 Min 5.06 Max
1
+ 0.10
0.25 – 0.05
0° – 15°
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
DP-14
Conforms
Conforms
0.97 g
Unit: mm
10.06
10.5 Max
8
5.5
14
1
0.10 ± 0.10
1.42 Max
1.27
*0.42 ± 0.08
0.40 ± 0.06
*0.22 ± 0.05
0.20 ± 0.04
2.20 Max
7
0.20
7.80 +– 0.30
1.15
0° – 8°
0.70 ± 0.20
0.15
0.12 M
*Dimension including the plating thickness
Base material dimension
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
FP-14DA
—
Conforms
0.23 g
5
HD74HCT125/HD74HCT126
Unit: mm
8.65
9.05 Max
8
1
7
*0.20 ± 0.05
0.635 Max
1.75 Max
3.95
14
+ 0.10
6.10 – 0.30
1.08
0.11
0.14 +– 0.04
0° – 8°
1.27
*0.40 ± 0.06
+ 0.67
0.60 – 0.20
0.15
0.25 M
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
*Pd plating
FP-14DN
Conforms
Conforms
0.13 g
Unit: mm
4.40
5.00
5.30 Max
14
8
1
7
0.65
1.0
0.13 M
6.40 ± 0.20
0.10
*Dimension including the plating thickness
Base material dimension
6
*0.17 ± 0.05
0.15 ± 0.04
1.10 Max
0.83 Max
0.07 +0.03
–0.04
*0.22+0.08
–0.07
0.20 ± 0.06
0° – 8°
0.50 ± 0.10
Hitachi Code
JEDEC
EIAJ
Mass (reference value)
TTP-14D
—
—
0.05 g
HD74HCT125/HD74HCT126
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received the latest product standards or specifications before final design, purchase or use.
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contact Hitachi’s sales office before using the product in an application that demands especially high
quality and reliability or where its failure or malfunction may directly threaten human life or cause risk
of bodily injury, such as aerospace, aeronautics, nuclear power, combustion control, transportation,
traffic, safety equipment or medical equipment for life support.
4. Design your application so that the product is used within the ranges guaranteed by Hitachi particularly
for maximum rating, operating supply voltage range, heat radiation characteristics, installation
conditions and other characteristics. Hitachi bears no responsibility for failure or damage when used
beyond the guaranteed ranges. Even within the guaranteed ranges, consider normally foreseeable
failure rates or failure modes in semiconductor devices and employ systemic measures such as failsafes, so that the equipment incorporating Hitachi product does not cause bodily injury, fire or other
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