Datasheet HD74HCT126, HD74HCT125 Datasheet (HIT)

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

HD74HCT125/HD74HCT126

AC Characteristics (CL = 50 pF, Input tr = tf = 6 ns)

Ta = –40 to

Ta = 25°C

Item Symbol Min Typ Max Min Max Unit V

Propagation delay t
time t
Output enable t
time t
Output disable t
time t
Output rise/fall t
time t

PHL

PLH

ZL

ZH

LZ

HZ

TLH

THL

— 12 20 — 25 ns 4.5
— 12 20 — 25 4.5
— 12 30 — 38 ns 4.5
— 12 30 — 38 4.5
— 15 30 — 38 ns 4.5
— 15 30 — 38 4.5
— 4 12 — 15 ns 4.5
— 4 12 — 15 4.5

Input capacitance Cin — 5 10 — 10 pF —

+85°C Test Conditions

(V)

CC

4

1

19.20

20.32 Max

1.30

Unit: mm

814

6.30

7.40 Max

7

2.54 ± 0.25

2.39 Max

0.48 ± 0.10

2.54 Min 5.06 Max

0.51 Min

Hitachi Code
JEDEC
EIAJ
Weight

7.62

+ 0.10

0.25

– 0.05

0° – 15°

(reference value)

DP-14
Conforms
Conforms

0.97 g

14

1.27

10.5 Max

1

10.06

1.42 Max

Unit: mm

8

5.5

7

+ 0.20

7.80

– 0.30

2.20 Max
*0.22 ± 0.05

1.15

0.20 ± 0.04
0° – 8°

0.70 ± 0.20

*0.42 ± 0.08

0.40 ± 0.06

*Dimension including the plating thickness

Base material dimension

0.12

0.10 ± 0.10

0.15

M

Hitachi Code
JEDEC
EIAJ

(reference value)

Weight

FP-14DA
—
Conforms

0.23 g

9.05 Max

14

Unit: mm

8.65

8

*Pd plating

1

0.635 Max

1.27

*0.40 ± 0.06

7

+ 0.11

– 0.04

0.14

0.25

3.95

1.75 Max

0.15

M

6.10

1.08

*0.20 ± 0.05

+ 0.67

0.60

– 0.20

Hitachi Code
JEDEC
EIAJ
Weight

+ 0.10
– 0.30

0° – 8°

(reference value)

FP-14DN
Conforms
Conforms

0.13 g

5.30 Max

14 8

17

+0.08

*0.22

–0.07

0.20 ± 0.06

5.00

0.83 Max

0.65

0.13

Unit: mm

4.40

1.0

M

6.40 ± 0.20

0.10

1.10 Max

*Dimension including the plating thickness

Base material dimension

0.15 ± 0.04

*0.17 ± 0.05

+0.03

–0.04

0.07

0° – 8°

Hitachi Code
JEDEC
EIAJ

(reference value)

Weight

0.50 ± 0.10

TTP-14D
—
—

0.05 g

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