HIT HD74HCT126, HD74HCT125 Datasheet
HD74HCT125/HD74HCT126
Quad. Bus Buffer Gates (with 3-state outputs)
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
HLXZZ
LH L L L
LH H H H
Notes: X: Irrelevant
Z: Off (High-impedance) state of a 3-state output.
HD74HCT125/HD74HCT126
Pin Arrangement
HD74HCT125
1
1C
14
V
CC
HD74HCT126
1A
1Y
2C
2A
2Y
GND
1C
1A
2
3
4
5
6
7
(Top view)
1
2
13
12
11
10
14
13
4C
4A
4Y
3C
3A
9
3Y
8
V
CC
4C
3
1Y
4
2C
5
2A
6
2Y
GND
2
7
(Top view)
12
11
10
4A
4Y
3C
3A
9
3Y
8
HD74HCT125/HD74HCT126
Absolute Maximum Ratings
Item Symbol Rating Unit
Supply voltage range V
Input voltage V
Output voltage V
Output current I
DC current drain per VCC, GND ICC, I
DC input diode current I
DC output diode current I
Power dissipation per package P
CC
IN
OUT
OUT
GND
IK
OK
T
Storage temperature Tstg –65 to +150 °C
DC Characteristics
Ta = –40 to
Ta = 25°C
Item Symbol Min Typ Max Min Max Unit V
Input voltage V
Output voltage V
IH
V
IL
OH
2.0 — — 2.0 — V 4.5 to
— — 0.8 — 0.8 V 4.5 to
4.4 — — 4.4 — V 4.5 Vin = VIH or VILIOH = –20 µA
4.18 — — 4.13 — 4.5 IOH = –6 mA
V
OL
— — 0.1 — 0.1 V 4.5 Vin = VIH or VILIOL = 20 µA
— — 0.26 — 0.33 4.5 IOL = 6 mA
Off-state output
I
OZ
——±0.5 — ±5.0 µA 5.5 Vin = VIH or VIL,
current
Input current Iin — — ±0.1 — ±1.0 µA 5.5 Vin = VCC or GND
Quiescent supply
I
CC
— — 4.0 — 40 µA 5.5 Vin = VCC or GND, Iout = 0 µA
current
+85°C Test Conditions
–0.5 to +7.0 V
–0.5 to VCC + 0.5 V
–0.5 to VCC + 0.5 V
±35 mA
±75 mA
±20 mA
±20 mA
500 mW
(V)
CC
5.5
5.5
Vout = V
or GND
CC
3
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