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Philips Semiconductors	Product speciﬁcation

Hex inverting Schmitt trigger	74HC14; 74HCT14

TRANSFER CHARACTERISTICS

Type 74HC

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

SYMBOL	PARAMETER	TEST CONDITIONS		MIN.	TYP.	MAX.	UNIT

		WAVEFORMS	VCC (V)
		WAVEFORMS	VCC (V)

Tamb = 25 °C; note 1

VT+	positive-going threshold	Figs 7 and 8	2.0	0.7	1.18	1.5	V
			4.5	1.7	2.38	3.15	V

			6.0	2.1	3.14	4.2	V

VT−	negative-going threshold	Figs 7 and 8	2.0	0.3	0.52	0.90	V
			4.5	0.9	1.40	2.00	V

			6.0	1.2	1.89	2.60	V

VH	hysteresis (VT+ − VT−)	Figs 7 and 8	2.0	0.2	0.66	1.0	V
			4.5	0.4	0.98	1.4	V

			6.0	0.6	1.25	1.6	V

Tamb = −40 to +85 °C

VT+	positive-going threshold	Figs 7 and 8	2.0	0.7	−	1.5	V
			4.5	1.7	−	3.15	V

			6.0	2.1	−	4.2	V

VT−	negative-going threshold	Figs 7 and 8	2.0	0.3	−	0.90	V
			4.5	0.90	−	2.00	V

			6.0	1.20	−	2.60	V

VH	hysteresis (VT+ − VT−)	Figs 7 and 8	2.0	0.2	−	1.0	V
			4.5	0.4	−	1.4	V

			6.0	0.6	−	1.6	V

Tamb = −40 to +125 °C

VT+	positive-going threshold	Figs 7 and 8	2.0	0.7	−	1.5	V
			4.5	1.7	−	3.15	V

			6.0	2.1	−	4.2	V

VT−	negative-going threshold	Figs 7 and 8	2.0	0.30	−	0.90	V
			4.5	0.90	−	2.00	V

			6.0	1.2	−	2.60	V

VH	hysteresis (VT+ − VT−)	Figs 7 and 8	2.0	0.2	−	1.0	V
			4.5	0.4	−	1.4	V

			6.0	0.6	−	1.6	V

Note

1. All typical values are measured at Tamb = 25 °C.

2003 Oct 30

Philips Semiconductors						Product speciﬁcation

Hex inverting Schmitt trigger				74HC14; 74HCT14

Family 74HCT
At recommended operating conditions: voltages are referenced to GND (ground = 0 V)

SYMBOL	PARAMETER	TEST CONDITIONS		MIN.	TYP.		MAX.	UNIT

		WAVEFORMS	VCC (V)
		WAVEFORMS	VCC (V)
Tamb = 25 °C; note 1

VT+	positive-going threshold	Figs 7 and 8	4.5	1.2	1.41		1.9	V
			5.5	1.4	1.59		2.1	V

VT−	negative-going threshold	Figs 7 and 8	4.5	0.5	0.85		1.2	V
			5.5	0.6	0.99		1.4	V

VH	hysteresis (VT+ − VT−)	Figs 7 and 8	4.5	0.4	0.56		−	V
			5.5	0.4	0.60		−	V

Tamb = −40 to +85 °C

VT+	positive-going threshold	Figs 7 and 8	4.5	1.2	−		1.9	V
			5.5	1.4	−		2.1	V

VT−	negative-going threshold	Figs 7 and 8	4.5	0.5	−		1.2	V
			5.5	0.6	−		1.4	V

VH	hysteresis (VT+ − VT−)	Figs 7 and 8	4.5	0.4	−		−	V
			5.5	0.4	−		−	V

Tamb = −40 to +125 °C

VT+	positive-going threshold	Figs 7 and 8	4.5	1.2	−		1.9	V
			5.5	1.4	−		2.1	V

VT−	negative-going threshold	Figs 7 and 8	4.5	0.5	−		1.2	V
			5.5	0.6	−		1.4	V

VH	hysteresis (VT+ − VT−)	Figs 7 and 8	4.5	0.4	−		−	V
			5.5	0.4	−		−	V

Note

1. All typical values are measured at Tamb = 25 °C.

2003 Oct 30

Philips Semiconductors						Product speciﬁcation

Hex inverting Schmitt trigger					74HC14; 74HCT14

AC CHARACTERISTICS
Type 74HC
GND = 0 V; tf = tf = 6 ns; CL = 50 pF

SYMBOL	PARAMETER	TEST CONDITIONS		MIN.	TYP.	MAX.	UNIT

		WAVEFORMS	VCC (V)
		WAVEFORMS	VCC (V)

Tamb = 25 °C; note 1

tPHL/tPLH	propagation delay nA to nY	see Fig.9	2.0	−	41	125	ns
			4.5	−	15	25	ns

			6.0	−	12	21	ns

tTHL/tTLH	output transition time	see Fig.9	2.0	−	19	75	ns
			4.5	−	7	15	ns

			6.0	−	6	13	ns

Tamb = −40 to +85 °C

tPHL/tPLH	propagation delay nA to nY	see Fig.9	2.0	−	−	155	ns
			4.5	−	−	31	ns

			6.0	−	−	26	ns

tTHL/tTLH	output transition time	see Fig.9	2.0	−	−	95	ns
			4.5	−	−	19	ns

			6.0	−	−	15	ns

Tamb = −40 to +125 °C

tPHL/tPLH	propagation delay nA to nY	see Fig.9	2.0	−	−	190	ns
			4.5	−	−	38	ns

			6.0	−	−	32	ns

tTHL/tTLH	output transition time	see Fig.9	2.0	−	−	110	ns
			4.5	−	−	22	ns

			6.0	−	−	19	ns

Note

1. All typical values are measured at Tamb = 25 °C.

2003 Oct 30

Philips Semiconductors							Product speciﬁcation

Hex inverting Schmitt trigger					74HC14; 74HCT14

Type 74HCT
GND = 0 V; tr = tf = 6 ns; CL = 50 pF

SYMBOL	PARAMETER	TEST CONDITIONS		MIN.		TYP.		MAX.	UNIT

		WAVEFORMS	VCC (V)
		WAVEFORMS	VCC (V)

Tamb = 25 °C; note 1

tPHL/tPLH	propagation delay nA to nY	see Fig.9	4.5	−		20		34	ns
tTHL/tTLH	output transition time	see Fig.9	4.5	−		7		15	ns
Tamb = −40 to +85 °C

tPHL/tPLH	propagation delay nA to nY	see Fig.9	4.5	43		−		−	ns
tTHL/tTLH	output transition time	see Fig.9	4.5	19		−		−	ns
Tamb = −40 to +125 °C

tPHL/tPLH	propagation delay nA to nY	see Fig.9	4.5	−		−		51	ns
tTHL/tTLH	output transition time	see Fig.9	4.5	−		−		22	ns

Note

1. All typical values are measured at Tamb = 25 °C.

TRANSFER CHARACTERISTIC WAVEFORMS

handbook, halfpage

VT+

VT−

	V			VI	VO
	V	H		VI	MNA845
		H
VT−			VT+	MNA844
VT−			VT+	MNA844

	VT+ and VT− are between limits of 20% and 70%.
Fig.7 Transfer characteristic.	Fig.8 The definitions of VT+, VT− and VH.

2003 Oct 30

Philips Semiconductors	Product speciﬁcation

Hex inverting Schmitt trigger	74HC14; 74HCT14

MNA846

50 ICC ( A)

0.4

0.8

1.2

1.6

2.0

VI (V)

VCC = 2 V.

Fig.9 Typical 74HC14 transfer characteristics.

MNA847

1.0 handbook, halfpage

ICC (mA)

0.8

0.6

0.4

0.2

VI (V)

VCC = 4.5 V.

Fig.10 Typical 74HC14 transfer characteristics.

1.0					MNA848	1.5					MNA849
1.0						1.5
handbook, halfpage						handbook, halfpage
ICC						ICC
(mA)						(mA)
(mA)						(mA)
0.8						1.2


0.6						0.9




0.4						0.6




0.2						0.3




0						0


	1.2	2.4	3.6	4.8
0	1.2	2.4	3.6	4.8	6.0	0	1	2	3	4	5
					VI (V)						VI (V)
VCC = 6 V.						VCC = 4.5 V.
Fig.11	Typical 74HC14 transfer characteristics.					Fig.12	Typical 74HCT14 transfer characteristics.

2003 Oct 30

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TRANSFER CHARACTERISTICS

AC CHARACTERISTICS

TRANSFER CHARACTERISTIC WAVEFORMS