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DM74LS393M

Part # DM74LS393M
Description IC COUNTER BIN DUAL 4BIT 14-SOIC
Category IC
Availability In Stock
Qty 67
Qty Price
1 + $0.15698
Manufacturer Available Qty
National Semiconductor Corp
Date Code: 9112
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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 DS006434 www.fairchildsemi.com
August 1986
Revised March 2000
DM74LS393 Dual 4-Bit Binary Counter
DM74LS393
Dual 4-Bit Binary Counter
General Description
Each of these monolithic circuits contains eight master-
slave flip-flops and additional gating to implement two indi-
vidual four-bit counters in a single package. The
DM74LS393 comprises two independent four-bit binary
counters each having a clear and a clock input. N-bit binary
counters can be implemented with each package providing
the capability of divide-by-256. The DM74LS393 has paral-
lel outputs from each counter stage so that any submultiple
of the input count frequency is available for system-timing
signals.
Features
Dual version of the popular DM74LS93
DM74LS393 dual 4-bit binary counter with individual
clocks
Direct clear for each 4-bit counter
Dual 4-bit versions can significantly improve system
densities by reducing counter package count by 50%
Typical maximum count frequency 35 MHz
Buffered outputs reduce possibility of collector commu-
tation
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter “X” to the ordering code.
Connection Diagram Function Table
Counter Sequence (Each Counter)
H = HIGH Logic Level
L = LOW Logic Level
Order Number Package Number Package Description
DM74LS393M M14A 14-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-120, 0.150 Narrow
DM74LS373N N14A 14-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Count
Outputs
Q
D
Q
C
Q
B
Q
A
0 LLLL
1 LLLH
2LLHL
3LLHH
4LHLL
5LHLH
6LHHL
7 LHHH
8 HLLL
9HLLH
10HLHL
11 H L H H
12 H H L L
13 H H L H
14 HHHL
15 HHHH
www.fairchildsemi.com 2
DM74LS393
Logic Diagram
3 www.fairchildsemi.com
DM74LS393
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
Note 2: C
L
= 15 pF, R
L
= 2 k, T
A
= 25°C and V
CC
= 5V.
Note 3: C
L
= 50 pF, R
L
= 2 k, T
A
= 25°C and V
CC
= 5V.
Note 4: The symbol () indicates that the falling edge of the clear pulse is used for reference.
Note 5: T
A
= 25°C, and V
CC
= 5V.
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted)
Note 6: All typicals are at V
CC
= 5V, T
A
= 25°C.
Note 7: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 8: I
CC
is measured with all outputs open, both CLEAR inputs grounded following momentary connection to 4.5V, and all other inputs grounded.
Supply Voltage 7V
Input Voltage
Clear 7V
A5.5V
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
f
CLK
Clock Frequency (Note 2) 0 25 MHz
f
CLK
Clock Frequency (Note 3) 0 20 MHz
t
W
Pulse Width (Note 5) A 20
ns
Clear HIGH 20
t
REL
Clear Release Time (Note 4)(Note 5) 25 ns
T
A
Free Air Operating Temperature 0 70 °C
Symbol Parameter Conditions Min
Typ
Max Units
(Note 6)
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
IH
= Min
V
OL
LOW Level V
CC
= Min, I
OL
= Max
0.35 0.5
Output Voltage V
IL
= Max, V
IH
= Min V
I
OL
= 4 mA, V
CC
= Min 0.25 0.4
I
I
Input Current @ Max V
CC
= Max, V
I
= 7V Clear 0.1
mA
Input Voltage V
CC
= Max, V
I
= 5.5V A 0.2
I
IH
HIGH Level V
CC
= Max, V
I
= 2.7V Clear 20
µA
Input Current A 40
I
IL
LOW Level V
CC
= Max, V
I
= 0.4V Clear 0.4
mA
Input Current A 1.6
I
OS
Short Circuit Output Current V
CC
= Max (Note 7) 20 100 mA
I
CC
Supply Current V
CC
= Max (Note 8) 15 26 mA
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