MOTOROLA SN74LS14DR2, SN74LS14M, SN74LS14MEL, SN74LS14ML1, SN74LS14ML2 Datasheet

SCHMITT TRIGGERS

DUAL GATE/HEX INVERTER

The SN54LS/74LS13 and SN54LS/74LS14 contain logic gates/inverters which accept standard TTL input signals and provide standard TTL output levels. They are capable of transforming slowly changing input signals into sharply defined, jitter-free output signals. Additionally, they have greater noise margin than conventional inverters.

Each circuit contains a Schmitt trigger followed by a Darlington level shifter and a phase splitter driving a TTL totem pole output. The Schmitt trigger uses positive feedback to effectively speed-up slow input transitions, and provide different input threshold voltages for positive and negative-going transitions. This hysteresis between the positive-going and negative-going input thresholds (typically 800 mV) is determined internally by resistor ratios and is essentially insensitive to temperature and supply voltage variations.

LOGIC AND CONNECTION DIAGRAMS

SN54 / 74LS13

VCC

	14			13			12			11			10				9							8

1	2	3	4	5	6	7
						GND
VCC		SN54 / 74LS14
14	13	12	11	10	9	8
1	2	3	4	5	6	7
						GND

SN54/74LS13

SN54/74LS14

SCHMITT TRIGGERS

DUAL GATE/HEX INVERTER

LOW POWER SCHOTTKY

			J SUFFIX
			CERAMIC
			CASE 632-08
14	1
			N SUFFIX
			PLASTIC
14			CASE 646-06
	1
			D SUFFIX
	14		SOIC
			CASE 751A-02
		1

ORDERING INFORMATION

SN54LSXXJ Ceramic

SN74LSXXN Plastic

SN74LSXXD SOIC

GUARANTEED OPERATING RANGES

Symbol	Parameter		Min	Typ	Max	Unit
VCC	Supply Voltage	54	4.5	5.0	5.5	V
		74	4.75	5.0	5.25
TA	Operating Ambient Temperature Range	54	± 55	25	125	°C
		74	0	25	70
IOH	Output Current Ð High	54, 74			± 0.4	mA
IOL	Output Current Ð Low	54			4.0	mA
		74			8.0

FAST AND LS TTL DATA

5-1