Datasheet 74HCT14U, 74HCT14PW, 74HCT14NB, 74HCT14N, 74HCT14DB Datasheet (Philips)

DATA SH EET

Product specification
File under Integrated Circuits, IC06

September 1993

INTEGRATED CIRCUITS

74HC/HCT14

Hex inverting Schmitt trigger

For a complete data sheet, please also download:

•The IC06 74HC/HCT/HCU/HCMOS Logic Family Specifications

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Information

•The IC06 74HC/HCT/HCU/HCMOS Logic Package Outlines

September 1993 2

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

FEATURES

• Output capability: standard

• ICC category: SSI

GENERAL DESCRIPTION

The 74HC/HCT14 are high-speed Si-gate CMOS devices and are pin compatible with low power Schottky TTL (LSTTL).
They are specified in compliance with JEDEC standard no. 7A.

The 74HC/HCT14 provide six inverting buffers with Schmitt-trigger action. They are capable of transforming slowly
changing input signals into sharply defined, jitter-free output signals.

QUICK REFERENCE DATA

GND = 0 V; T

amb

= 25 °C; tr= tf= 6 ns

Notes

1. C

PD

is used to determine the dynamic power dissipation (PDin µW):

PD= CPD× V

CC

2

× fi+ ∑ (CL× V

CC

2

× fo) where:
fi= input frequency in MHz
fo= output frequency in MHz
CL= output load capacitance in pF
VCC= supply voltage in V
∑ (CL× V

CC

2

× fo) = sum of outputs

2. For HC the condition is VI= GND to V

CC

For HCT the condition is VI= GND to VCC− 1.5 V

ORDERING INFORMATION

See

“74HC/HCT/HCU/HCMOS Logic Package Information”

.

SYMBOL PARAMETER CONDITIONS

TYPICAL

UNIT

HC HCT

t

PHL

/ t

PLH

propagation delay nA to nY CL= 15 pF; VCC= 5 V 12 17 ns

C

I

input capacitance 3.5 3.5 pF

C

PD

power dissipation capacitance per gate notes 1 and 2 7 8 pF

September 1993 3

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

PIN DESCRIPTION

PIN NO. SYMBOL NAME AND FUNCTION

1, 3, 5, 9, 11, 13 1A to 6A data inputs
2, 4, 6, 8, 10, 12 1Y to 6Y data outputs
7 GND ground (0 V)
14 V

CC

positive supply voltage

Fig.1 Pin configuration. Fig.2 Logic symbol. Fig.3 IEC logic symbol.

Fig.4 Functional diagram. Fig.5 Logic diagram

(one Schmitt trigger).

FUNCTION TABLE

Notes

1. H = HIGH voltage level
L = LOW voltage level

APPLICATIONS

• Wave and pulse shapers

• Astable multivibrators

• Monostable multivibrators

INPUT OUTPUT

nA nY

L

H

H

L

September 1993 4

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

DC CHARACTERISTICS FOR 74HC

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”

. Transfer characteristics are

given below.
Output capability: standard

ICCcategory: SSI

Transfer characteristics for 74HC

Voltages are referenced to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HC

GND = 0 V; t

f

= tf= 6 ns; CL= 50 pF

SYMBOL PARAMETER

T

amb

(°C)

UNIT

TEST CONDITIONS

74HC

V

CC

(V)

WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

V

T

+ positive-going

threshold

0.7

1.7

2.1

1.18

2.38

3.14

1.5

3.15

4.2

0.7

1.7

2.1

1.5

3.15

4.2

0.7

1.7

2.1

1.5

3.15

4.2

V 2.0

4.5

6.0

Figs 6 and 7

V

T

− negative-going
threshold

0.3

0.9

1.2

0.52

1.40

1.89

0.90

2.00

2.60

0.3

0.90

1.20

0.90

2.00

2.60

0.30

0.90

1.2

0.90

2.00

2.60

V 2.0

4.5

6.0

Figs 6 and 7

V

H

hysteresis
(VT+ − VT−)

0.2

0.4

0.6

0.66

0.98

1.25

1.0

1.4

1.6

0.2

0.4

0.6

1.0

1.4

1.6

0.2

0.4

0.6

1.0

1.4

1.6

V 2.0

4.5

6.0

Figs 6 and 7

SYMBOL PARAMETER

T

amb

(°C)

UNIT

TEST CONDITIONS

74HC

V

CC

(V)

WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

t

PHL

/ t

PLH

propagation delay

nA to nY

41
15
12

125
25
21

155
31
26

190
38
32

ns 2.0

4.5

6.0

Fig.8

t

THL

/ t

TLH

output transition
time

19
7
6

75
15
13

95
19
15

110
22
19

ns 2.0

4.5

6.0

Fig.8

September 1993 5

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

DC CHARACTERISTICS FOR 74HCT

For the DC characteristics see

“74HC/HCT/HCU/HCMOS Logic Family Specifications”

. Transfer characteristics are

given below.
Output capability: standard

ICCcategory: SSI

Note to HCT types

The value of additional quiescent supply current (∆ICC) for a unit load of 1 is given in the family specifications.
To determine ∆I

CC

per input, multiply this value by the unit load coefficient shown in the table below.

Transfer characteristics for 74HCT

Voltages are referenced to GND (ground = 0 V)

AC CHARACTERISTICS FOR 74HCT

GND = 0 V; t

r

= tf= 6 ns; CL= 50 pF

INPUT UNIT LOAD COEFFICIENT

nA 0.3

SYMBOL PARAMETER

T

amb

(°C)

UNIT

TEST CONDITIONS

74HCT

V

CC

(V)

WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

V

T

+ positive-going

threshold

1.2

1.4

1.41

1.59

1.9

2.1

1.2

1.4

1.9

2.1

1.2

1.4

1.9

2.1

V 4.5

5.5

Figs 6 and 7

V

T

− negative-going
threshold

0.5

0.6

0.85

0.99

1.2

1.4

0.5

0.6

1.2

1.4

0.5

0.6

1.2

1.4

V 4.5

5.5

Figs 6 and 7

V

H

hysteresis
(VT+ −VT−)

0.4

0.4

0.56

0.60−−

0.4

0.4−−

0.4

0.4−−

V 4.5

5.5

Figs 6 and 7

SYMBOL PARAMETER

T

amb

(°C)

UNIT

TEST CONDITIONS

74HCT

V

CC

(V)

WAVEFORMS+25 −40 to +85 −40 to +125

min. typ. max. min. max. min. max.

t

PHL

/ t

PLH

propagation delay

nA, to nY

20 34 43 51 ns 4.5 Fig.8

t

THL

/ t

TLH

output transition
time

7 15 19 22 ns 4.5 Fig.8

September 1993 6

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

TRANSFER CHARACTERISTIC WAVEFORMS

Fig.6 Transfer characteristic.

Fig.7 Waveforms showing the definition of VT+,

VT− and VH; where VT+ and VT− are
between limits of 20% and 70%.

Fig.8 Typical HC transfer characteristics; VCC= 2 V. Fig.9 Typical HC transfer characteristics; VCC= 4.5 V.

Fig.10 Typical HC transfer characteristics; VCC= 6 V.

Fig.11 Typical HCT transfer characteristics; VCC= 4.5 V.

September 1993 7

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

AC WAVEFORMS

Fig.12 Typical HCT transfer characteristics; VCC= 5.5 V.

Fig.13 Waveforms showing the input (nA) to

output (nY) propagation delays and
output transitions times.

(1) HC : VM= 50%; VI= GND to VCC.

HCT: V

M

= 1.3 V; VI= GND to 3 V.

September 1993 8

Philips Semiconductors Product specification

Hex inverting Schmitt trigger 74HC/HCT14

APPLICATION INFORMATION

The slow input rise and fall times cause additional power
dissipation, this can be calculated using the following
formula:

Pad= fi× (tr× I

CCa+tf×ICCa

) × VCC.

Where:

Average I

CCa

differs with positive or negative input

transitions, as shown in Figs 14 and 15.

P

ad

= additional power dissipation (µW)

f

i

= input frequency (MHz)

t

r

= input rise time (µs); 10% − 90%

t

f

= input fall time (µs); 10% − 90%

I

CCa

= average additional supply current (µA)

Fig.14 Average ICCfor HC Schmitt trigger devices;

linear change of Vibetween 0.1 VCCto

0.9 V

CC

Fig.15 Average ICCfor HCT Schmitt trigger devices;

linear change of Vibetween 0.1 VCCto

0.9 VCC.

HC/HCT14 used in a relaxation oscillator circuit, see
Fig.16.

Fig.16 Relaxation oscillator using HC/HCT14.

HC : f

1
T

---

1

0.8 RC

------------------ -

≈=

HCT : f

1
T

---

1

0.67 RC

----------------------

≈=

Note to Application information

All values given are typical unless otherwise specified.

PACKAGE OUTLINES

See

“74HC/HCT/HCU/HCMOS Logic Package Outlines”

.