Fairchild Semiconductor DM74LS28MX, DM74LS28M Datasheet
© 2000 Fairchild Semiconductor Corporation DS010169 www.fairchildsemi.com
March 1989
Revised March 2000
DM74LS28 Quad 2-Input NOR Buffer
DM74LS28
Quad 2-Input NOR Buffer
General Description
The DM74LS28 con tains four independent g ates each of
which perform the logic NOR function.
Ordering Code:
Devices also availab le in Tape and Reel. Specify by appending th e s uffix let t er “X” to the ordering code.
Connection Diagram Truth Table
Y = A+B
H = HIGH logic level
L = LOW logic level
Order Number Package Number Package Description
DM74LS28M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Inputs Output
ABY
LLH
LHL
HLL
HHL
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DM74LS28
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratin gs” are those v alues beyon d which
the safety of the dev ice cannot be guaranteed. T he device sh ould not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommend ed O peratin g Cond itions” t able w ill defin e the co ndition s
for actual device operation.
Recommended Operating Conditions
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 2: All typicals are at VCC = 5V, TA = 25°C.
Note 3: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Switching Characteristics
VCC = +5.0V, TA = +25°C
Supply Voltage 7V
Input Voltage 7V
Operating Free Air Temperature Range 0°C to +70°C
Storage Temperature Range −65°C to +150°C
Symbol Parameter Min Nom Max Units
V
CC
Supply Voltage 4.75 5 5.25 V
V
IH
HIGH Level Input Voltage 2 V
V
IL
LOW Level Input Voltage 0.7 V
I
OH
HIGH Level Output Current −1.2 mA
I
OL
LOW Level Output Current 24 mA
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 2)
V
I
Input Clamp Voltage VCC = Min, II = −18 mA −1.5 V
V
OH
HIGH Level Output Voltage VCC = Min, IOH = Max, VIL = Max 2.7 V
V
OL
LOW Level Output Voltage VCC = Min, IOL = Max, VIH = Min 0.5
V
IOL = 12 mA, VCC = Min 0.4
I
I
Input Current @ Max Input Voltage VCC = Max, VI = 7V 0.1 mA
I
IH
HIGH Level Input Current VCC = Max, VI = 2.7V 20 µA
I
IL
LOW Level Input Current VCC = Max, VI = 0.4V −0.4 mA
I
OS
Short Circuit Output Current VCC = Max (Note 3) −30 −130 mA
I
CCH
Supply Current with Outputs HIGH VCC = Max 3.6 mA
I
CCL
Supply Current with Outputs LOW VCC = Max 13.8 mA
RL = 2 kΩ
Symbol Parameter CL = 15 pF Units
Min Max
t
PLH
Propagation Delay Time
20 ns
LOW-to-HIGH Level Output
t
PHL
Propagation Delay Time
20 ns
HIGH-to-LOW Level Output
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