Page 1
© 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
Page 2
www.fairchildsemi.com 2
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
Page 3
3 www.fairchildsemi.com
DM74LS28 Quad 2-Input NOR Buffer
Physical Dimensions inches (millimeters) unless otherwise noted
14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
Package Number M14A
Fairchild does not assume any responsibility for use of any circu itry described, no circuit patent license s are implied and
Fairchild reserves the right at any time without notice to change said circuitry and specifications.
LIFE SUPPORT POLICY
FAIRCHILD’S PRODUCTS ARE NOT AUTHORIZED FOR USE AS CRITICAL COMPONENTS IN LIFE SUPPORT
DEVICES OR SYSTEMS WITHOUT THE EXPRESS WRITTEN APPROVAL OF THE PRESIDENT OF FAIRCHILD
SEMICONDUCTOR CORPORATION. As used herein:
1. Life support devices or systems are dev ic es or syste ms
which, (a) are intended for surgical implant into the
body, or (b) support or sustain life, and (c) whose failure
to perform when properly used in accordance with
instructions for use provided i n the labe li ng, can be re asonably expected to result in a significant injury to the
user.
2. A critical componen t in any com ponent o f a l ife supp ort
device or system whose failu re to perform can b e reasonably expected to c ause th e fa i lure of the li fe s upp or t
device or system, or to affect its safety or effectiveness.
www.fairchildsemi.com
Loading...