NXP 74HC244BQ, 74HC244D, 74HC244DB, 74HC244N, 74HC244PW Schematics

74HC244; 74HCT244

Octal buffer/line driver; 3-state

Rev. 4 — 24 September 2012 Product data sheet

1. General description

The 74HC244; 74HCT244 is an 8-bit buffer/line driver with 3-state outputs. The device
can be used as two 4-bit buffers or one 8-bit buffer. The device features two output
enables (1OE
causes the outputs to assume a high-impedance OFF-state. Inputs include clamp diodes
that enable the use of current limiting resistors to interface inputs to voltages in excess of
V

.

CC

2. Features and benefits

 Input levels:

 For 74HC244: CMOS level

 For 74HCT244: TTL level
 Octal bus interface
 Non-inverting 3-state outputs
 Complies with JEDEC standard no. 7 A
 ESD protection:

 HBM JESD22-A114F exceeds 2000 V

 MM JESD22-A115-A exceeds 200 V
 Multiple package options
 Specifie d from 40 Cto +85C and 40 Cto +125C

and 2OE), each controlling four of the 3-state outputs. A HIGH on nOE

3. Ordering information

Table 1. Ordering information

Type number Package

74HC244N 40 Cto+125C DIP20 plastic dual in-line package; 20 leads (300 mil) SOT146-1
74HCT244N
74HC244D 40 Cto+125C SO20 plastic small outline package; 20 leads;
74HCT244D
74HC244DB 40 Cto+125C SSOP20 plastic shrink small outline package; 20 leads;
74HCT244DB
74HC244PW 40 Cto+125C TSSOP20 plastic thin shrink small outline package; 20 leads;
74HCT244PW
74HC244BQ 40 C to +125 C DHVQFN20 plastic dual-in-line compatible thermal enhanced
74HCT244BQ

Temperature range Name Description Version

SOT163-1

body width 7.5 mm

SOT339-1

body width 5.3 mm

SOT360-1

body width 4.4 mm

SOT764-1
very thin quad flat package; no leads; 20 terminals;
body 2.5  4.5  0.85 mm

NXP Semiconductors

mna875

1A3

1A2

1A1

1A0

2

4

6

8

1

1Y0

1Y1

18

16

14

12

1Y2

1Y3

1OE

2A3

2A2

2A1

2A0

17

15

13

11

19

2Y0

2Y1

3

5

7

9

2Y2

2Y3

2OE

mna874

8

6

4

2

1A0

1A1

1A2

1A3

1OE

18

16

1Y0

1Y1

1Y2

1Y3

14

12

1

11

13

15

17

2A0

2A1

2A2

2A3

2OE

3

5

2Y0

2Y1

2Y2

2Y3

7

9

19

12

14

2
4

6
8

18
16

1

EN

mna873

3

5

11
13

15
17

9
7

19

EN

4. Functional diagram

74HC244; 74HCT244

Octal buffer/line driver; 3-state

Fig 1. Functional diagram

Fig 2. Logic symbol Fig 3. IEC logic symbol

74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.

Product data sheet Rev. 4 — 24 September 2012 2 of 18

NXP Semiconductors

74HC244

74HCT244

1OE V

CC

1A0 2OE
2Y0 1Y0
1A1 2A0
2Y1 1Y1
1A2 2A1
2Y2 1Y2
1A3 2A2
2Y3 1Y3

GND 2A3

001aae011

1
2
3
4
5
6
7
8
9

10

12
11

14
13

16
15

18
17

20
19

001aae012

74HC244

74HCT244

Transparent top view

1Y3

1A3
2Y3

2A2

2Y2 1Y2

1A2 2A1

2Y1 1Y1

1A1 2A0

2Y0 1Y0

1A0 2OE

GND

2A3

1OE

V

CC

9

12

8 13

7 14

6 15

5 16

4 17

3 18

2 19

10

11

1

20

terminal 1

index area

GND

(1)

5. Pinning information

5.1 Pinning

74HC244; 74HCT244

Octal buffer/line driver; 3-state

Fig 4. Pin configuration DIP20, SO20, (T)SSOP20 Fig 5. Pin configuration DHVQFN20

5.2 Pin description

Table 2. Pin description

Symbol Pin Description

, 2OE 1, 19 output enable input (active LOW)

1OE
1A0, 1A1, 1A2, 1A3 2, 4, 6, 8 data input
2Y0, 2Y1, 2Y2, 2Y3 3, 5, 7, 9 bus output
GND 10 ground (0 V)
2A0, 2A1, 2A2, 2A3 17, 15, 13, 11 data input
1Y0, 1Y1, 1Y2, 1Y3 18, 16, 14, 12 bus output
V

74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.

Product data sheet Rev. 4 — 24 September 2012 3 of 18

CC

(1) This is not a supply pin. The substrate is attached to this

pad using conductive die attach material. There is no
electrical or mechanical requirement to solder this pad.
However, if it is soldered, the solder land should remain
floating or be connected to GND.

20 supply voltage

NXP Semiconductors

74HC244; 74HCT244

Octal buffer/line driver; 3-state

6. Functional description

Table 3. Function table

[1]

Input Output
nOE nAn nYn

LLL
LHH
HXZ

[1] H = HIGH voltage level; L = LOW voltage level; X = don’t care; Z = high-impedance OFF-state.

7. Limiting values

Table 4. Limiting values

In accordance with the Absolute Maximum Rating System (IEC 60134). Voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions Min Max Unit

V
I

IK

I

OK

I

O

I

CC

I

GND

T
P

CC

stg

tot

supply voltage 0.5 +7 V
input clamping current VI < 0.5 V or VI>VCC+0.5 V - 20 mA
output clamping current VO< 0.5 V or VO>VCC+0.5V - 20 mA
output current 0.5 V < VO < VCC+0.5V - 35 mA
supply current - 70 mA
ground current 70 - mA
storage temperature 65 +150 C
total power dissipation DIP20 package

SO20, SSOP20, TSSOP20 and

[1]

- 750 mW

[2]

- 500 mW

DHVQFN20 packages

[1] For DIP20 package: P
[2] For SO20 packages: P

For SSOP20 and TSSOP20 packages: P
For DHVQFN20 packages: above 60 C, P

derates linearly with 12 mW/K above 70 C.

tot

derates linearly with 8 mW/K above 70 C.

tot

derates linearly with 5.5 mW/K above 60 C.

tot

derates linearly with 4.5 mW/K.

tot

8. Recommended operating conditions

Table 5. Recommended operating conditions

Symbol Parameter Conditions Min Typ Max Unit

74HC244

V

CC

V

I

V

O

supply voltage 2.0 5.0 6.0 V
input voltage 0 - V
output voltage 0 - V

t/V input transition rise and fall rate V

T

amb

ambient temperature 40 - +125 C

CC
CC

= 2.0 V - - 625 ns/V

CC

= 4.5 V - 1.67 139 ns/V

V

CC

= 6.0 V - - 83 ns/V

V

CC

V
V

74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.

Product data sheet Rev. 4 — 24 September 2012 4 of 18

NXP Semiconductors

74HC244; 74HCT244

Octal buffer/line driver; 3-state

Table 5. Recommended operating conditions

…continued

Symbol Parameter Conditions Min Typ Max Unit

74HCT244

V

CC

V

I

V

O

t/V input transition rise and fall rate V
T

amb

supply voltage 4.5 5.0 5.5 V
input voltage 0 - V
output voltage 0 - V

= 4.5 V - 1.67 139 ns/V

CC

CC
CC

V
V

ambient temperature 40 - +125 C

9. Static characteristics

Table 6. Static characteristics

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions 25 C 40 C to +85 C 40 C to +125 C Unit

74HC244

V

IH

HIGH-level
input voltage

V

IL

LOW-level
input voltage

V

OH

HIGH-level
output voltage

V

OL

LOW-level
output voltage

I

I

input leakage
current

I

OZ

OFF-state
output current

I

CC

C

I

supply current VI=VCCor GND; IO=0A;

input
capacitance

Min Typ Max Min Max Min Max

VCC= 2.0 V 1.5 1.2 - 1.5 - 1.5 - V

= 4.5 V 3.15 2.4 - 3.15 - 3.15 - V

V

CC

= 6.0 V 4.2 3.2 - 4.2 - 4.2 - V

V

CC

VCC= 2.0 V - 0.8 0.5 - 0.5 - 0.5 V

= 4.5 V - 2.1 1.35 - 1.35 - 1.35 V

V

CC

= 6.0 V - 2.8 1.8 - 1.8 - 1.8 V

V

CC

VI=VIHor V

IL

IO= 20 A; VCC= 2.0 V 1.9 2.0 - 1.9 - 1.9 - V

= 20 A; VCC= 4.5 V 4.4 4.5 - 4.4 - 4.4 - V

I

O

= 20 A; VCC= 6.0 V 5.9 6.0 - 5.9 - 5.9 - V

I

O

= 6.0 mA; VCC= 4.5 V 3.98 4.32 - 3.84 - 3.7 - V

I

O

= 7.8 mA; VCC= 6.0 V 5.48 5.81 - 5.34 - 5.2 - V

I

O

VI=VIHor V

IL

IO=20A; VCC= 2.0 V - 0 0.1 - 0.1 - 0.1 V

=20A; VCC= 4.5 V - 0 0.1 - 0.1 - 0.1 V

I

O

=20A; VCC= 6.0 V - 0 0.1 - 0.1 - 0.1 V

I

O

=6.0mA; VCC= 4.5 V - 0.15 0.26 - 0.33 - 0.4 V

I

O

=7.8mA; VCC= 6.0 V - 0.16 0.26 - 0.33 - 0.4 V

I

O

VI=VCCor GND;

--0.1 - 1.0 - 1.0 A

VCC=6.0V
per input pin; VI=VIHor VIL;

V

O=VCC

or GND;

--0.5 - 5.0 - 10 A

other inputs at VCC or GND;

=6.0V; IO=0A

V

CC

- - 8.0 - 80 - 160 A

=6.0V

V

CC

-3.5- - - - - pF

74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.

Product data sheet Rev. 4 — 24 September 2012 5 of 18

NXP Semiconductors

74HC244; 74HCT244

Octal buffer/line driver; 3-state

Table 6. Static characteristics …continued

At recommended operating conditions; voltages are referenced to GND (ground = 0 V).

Symbol Parameter Conditions 25 C 40 C to +85 C 40 C to +125 C Unit

Min Typ Max Min Max Min Max

74HCT244

V

V

V

V

I

I

I

I

C

I

OZ

CC

IH

IL

OH

OL

CC

I

HIGH-level
input voltage

LOW-level
input voltage

HIGH-level
output voltage

LOW-level
output voltage

input leakage
current

OFF-state
output current

supply current VI=VCCor GND;

additional
supply current

input
capacitance

VCC= 4 .5 V to 5.5 V 2.0 1.6 - 2.0 - 2.0 - V

VCC= 4.5 V to 5.5 V - 1.2 0.8 - 0.8 - 0.8 V

VI=VIHor VIL; VCC=4.5V

= 20 A 4.4 4.5 - 4.4 - 4.4 - V

I

O

= 6 mA 3.98 4.32 - 3.84 - 3.7 - V

I

O

VI=VIHor VIL; VCC=4.5V

=20A - 0 0.1 - 0.1 - 0.1 V

I

O

= 6.0 mA - 0.16 0.26 - 0.33 - 0.4 V

I

O

VI=VCCor GND;

=5.5V

V

CC

per input pin; VI=VIHor VIL;

--0.1 - 1.0 - 1.0 A

--0.5 - 5.0 - 10 A
VO=VCC or GND;
other inputs at VCC or GND;

=5.5V; IO=0A

V

CC

- - 8.0 - 80 - 160 A
VCC=5.5V; IO=0A

per input pin;
V

I=VCC

 2.1 V;

- 70 252 - 315 - 343 A
other inputs at VCCor GND;

VCC= 4.5 V to 5.5 V;

=0A

I

O

-3.5- - - - - pF

10. Dynamic characteristics

Table 7. Dynamic characteristics

GND = 0 V; for load circuit see Figure 8

Symbol Parameter Conditions 25 C 40 C to +125 C Unit

74HC244

t

pd

74HC_HCT244 All information provided in this document is subject to legal disclaimers. © NXP B.V. 2012. All rights reserved.

Product data sheet Rev. 4 — 24 September 2012 6 of 18

propagation delay nAn to nYn;

.

Min Typ Max Max

(85 C)

[1]

Max

(125 C)

see Figure 6

VCC = 2.0 V - 30 110 145 165 ns

= 4.5 V - 11 22 28 33 ns

V

CC

= 5.0 V; CL=15pF - 9 - - - ns

V

CC

= 6.0 V - 9 19 24 28 ns

V

CC