74LS14六路施密特触发反向器

SL74LS14

Hex Schmitt-Trigger Inverter

This device contains six independent gates each of which performs

the logic INVERT function. Each input has hysteresis which increases

the noise immunity and transforms a slowly changing input signal to a

fast changing, jitter free output.

LOGIC DIAGRAM

PIN 14 =V CC

PIN 7 = GND

PIN ASSIGNMENT

SL74LS14

System Logic

Semiconductor

MAXIMUM RATINGS * Symbol

Parameter Value Unit V CC

Supply Voltage 7.0 V V IN

Input Voltage 7.0 V V OUT

Output Voltage 5.5 V Tstg

Storage Temperature Range -65 to +150 °C *Maximum Ratings are those values beyond which damage to the device may occur.

Functional operation should be restricted to the Recommended Operating Conditions.

RECOMMENDED OPERATING CONDITIONS Symbol

Parameter Min Max Unit V CC

Supply Voltage 4.75 5.25 V I OH

High Level Output Current -15 mA I OL

Low Level Output Current 24 mA T A

Ambient Temperature Range 0 +70 °C

DC ELECTRICAL CHARACTERISTICS over full operating conditions

Guaranteed Limit Symbol

Parameter Test Conditions Min Max Unit V T+ -

Positive-Going Input Threshold Voltage V CC = 5 V 0.5 1 V V T- -

Negative-Going Input Threshold Voltage V CC = 5 V 1.4 1.9 V V T+ - V T-

Hysteresis V CC = 5 V 0.4 V V IK

Input Clamp Voltage V CC = min, I IN = -18 mA -1.5 V V OH

High Level Output Voltage V CC = min, I OH = -0.4 mA, V I =0.5 V 2.7 V V OL

Low Level Output Voltage V CC = min, I OL = 4 mA V I =1.9 V 0.4 V

V CC = min, I OL = 8 mA V I =1.9 V 0.5 I IH

High Level Input Current V CC = max, V IN = 2.7 V 20 μA

V CC = max, V IN = 7.0 V 0.1 mA I IL

Low Level Input Current V CC = max, V IN = 0.4 V -0.4 mA I O

Output Short Circuit Current V CC = max, V O =0 V (Note 1) -20 -100 mA I CC

Supply Current Total with outputs high V CC = max 16 mA Total with

outputs low 21

SL74LS14

Note 1: Not more than one output should be shorted at a time, and the duration should not exceed one second.

System Logic

Semiconductor

SL74LS14

System Logic

Semiconductor

AC ELECTRICAL CHARACTERISTICS (T A = 25°C, V CC = 5.0 V, C L = 15 pF, R L = 2 k ?, t r = 15 ns, t f = 6.0 ns)

Symbol

Parameter Min Max Unit t PLH

Propagation Delay, Input A to Output Y 22 ns t PHL Propagation Delay, Input A to Output Y 22 ns

Figure 1. Switching Waveforms

NOTES A. C L includes probe and jig capacitance.

B. All diodes are 1N916 or 1N3064.

Figure 2. Test Circuit