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DM74LS273N

Part # DM74LS273N
Description Flip Flops 8-Bit Register
Category IC
Availability In Stock
Qty 2
Qty Price
1 + $1.04052
Manufacturer Available Qty
National Semiconductor Corp
Date Code: 9030
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Technical Document


DISCLAIMER: The information provided herein is solely for informational purposes. Customers must be aware of the suitability of this product for their application, and consider that variable factors such as Manufacturer, Product Category, Date Codes, Pictures and Descriptions may differ from available inventory.

© 2000 Fairchild Semiconductor Corporation DS009825 www.fairchildsemi.com
October 1988
Revised March 2000
DM74LS273 8-Bit Register with Clear
DM74LS273
8-Bit Register with Clear
General Description
The DM74LS273 is a high speed 8-bit register, consisting
of eight D-type flip-flops with a common Clock and an
asynchronous active LOW Master Reset. This device is
supplied in a 20-pin package featuring 0.3 inch row spac-
ing.
Features
Edge-triggered
8-bit high speed register
Parallel in and out
Common clock and master reset
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Logic Symbol
V
CC
= Pin 20
GND = Pin 10
Pin Descriptions
Connection Diagram
Truth Table
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial
Order Number Package Number Package Description
DM74LS273WM M20B 20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
DM74LS273SJ M20D 20-Lead Small Outline Package (SOP), EIAJ TYPE II, 5.3mm Wide
DM74LS273N N20A 20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Pin Names Description
CP Clock Pulse Input (Active Rising Edge)
D0–D7 Data Inputs
MR
Asynchronous Master Reset Input (Active LOW)
Q0–Q7 Flip-Flop Outputs
Inputs Outputs
MR CP D
n
Q
n
LXXL
H
HH
H
LL
www.fairchildsemi.com 2
DM74LS273
Functional Description
The DM74LS273 is an 8-bit parallel register with a common
Clock and common Master Reset. When the MR
input is
LOW, the Q outputs are LOW, independent of the other
inputs. Information meeting the setup and hold time
requirements of the D inputs is transferred to the Q outputs
on the LOW-to-HIGH transition of the clock input.
Logic Diagram
3 www.fairchildsemi.com
DM74LS273
Absolute Maximum Ratings(Note 1)
Note 1: The “Absolute Maximum Ratings” are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the absolute maximum ratings.
The “Recommended Operating Conditions” table will define the conditions
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 V
CC
= 5V, T
A
= 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
V
CC
= +5.0V, T
A
=+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 0.8 V
I
OH
HIGH Level Output Current 0.4 mA
I
OL
LOW Level Output Current 8 mA
T
A
Free Air Operating Temperature 0 70 °C
t
S
(H) Setup Time HIGH or LOW 15
ns
t
S
(L) D
n
to CP 15
t
H
(H) Hold Time HIGH or LOW 5
ns
t
H
(L) D
n
to CP 5
t
W
(H) CP Pulse Width HIGH or LOW 20
ns
t
W
(L) 20
t
W
(L) MR Pulse Width LOW 20 ns
t
REC
Recovery Time
15 ns
MR
to CP
Symbol Parameter Conditions Min
Typ
Max Units
(Note 2)
V
I
Input Clamp Voltage V
CC
= Min, I
I
= 18 mA 1.5 V
V
OH
HIGH Level V
CC
= Min, I
OH
= Max,
2.7 3.4 V
Output Voltage V
IL
= Max
V
OL
LOW Level V
CC
= Min, I
OL
= Max,
0.35 0.5
Output Voltage V
IH
= Min V
I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max Input Voltage V
CC
= Max, V
I
= 7V 0.1 mA
I
IH
HIGH Level Input Current V
CC
= Max, V
I
= 2.7V 20 µA
I
IL
LOW Level Input Current V
CC
= Max, V
I
= 0.4V 0.4 mA
I
OS
Short Circuit Output Current V
CC
= Max (Note 3) 20 100 mA
I
CC
Supply Current V
CC
= Max 27 mA
Symbol Parameter
C
L
= 15 pF
UnitsR
L
= 2 k
Min Max
f
MAX
Maximum Clock Frequency 30 MHz
t
PLH
Propagation Delay 24
ns
t
PHL
CP to Q
n
24
t
PLH
Propagation Delay
27 ns
MR to Q
n
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