PIN DESCRIPTION

PIN No

SYMBOL

NAME AND FUNCTION

1, 5, 10. 14

1R to 4R

Reset Inputs (Active LOW)

2, 3, 6, 11,

12, 15

1S1, 1S2, 2S,

3S1, 3S2, 4S

Set Inputs (Active LOW)

4, 7, 9, 13

1Q to 4Q

Outputs

8

GND

Ground (0V)

16

Positive Supply Voltage

IEC LOGIC SYMBOL

ABSOLUTE MAXIMUM RATINGS

Symbol

Parameter

Value

Unit

Supply Voltage

-0.5 to +7

V

DC Input Voltage

V

DC Output Voltage

V

DC Input Diode Current

± 20

mA

DC Output Diode Current

± 20

mA

DC Output Source Sink Current Per Output Pin

± 25

mA

± 50

mA

Power Dissipation

500 (*)

mW

Storage Temperature

-65 to +150

Lead Temperature (10 sec)

300

Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.

(*) 500 mW:

TRUTH TABLE

S#

R

Q

HH

Q0

LH

H

HL

L

LL

H

NOTE: Q0 = THE LEVEL OF Q BEFORE THE INDICRTED INPUT

CONDITION WAS ESTABLISHED.

#

FOR LATCHES WITH DOUBLE S INPUT:

H = BOTH S INPUTS HIGH

L = ONE OF BOTH INPUTS LOW

LOGIC DIAGRAM

M54/M74HC279

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