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DM74LS393M-DM74LS393N
7 V, dual 4-bit binary counter
National
[ Semiconductor
DM74LS393 Dual 4-Bit Binary Counter
General Description
Each of these monofithic circuits contains eight master-
slave flip-flops and additional gating to implement two indi- .
vidual four-bit counters in a single package. The 'LS393
comprises two independent tour-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-tWh The LS393 has parallel outputs from each
counter stage so that any submultiple of the input count
freqency is available for system-timing signals.
Features
ll Dual version of the popular 'L893
1: 'LS393 dual 4-bit binary counter with individual clocks
a Direct clear for each 4-bit counter
u Dual 4-bit versions can significantly improve system
densities by reducing counter package count by 50%
ll Typical maximum count frequency 35 MHz
n Buffered outputs reduce possibility of Collector commu-
tation
Connection Diagram Function Table
Count Sequence
Dual-ln-Llne Package (Each Counter)
OUTPUTS
2 ------P---s Count Outputs
VCC " CLEAR 20A 203 20c 200 tto A: th, 0A
I14 13 " 11 1o 9 a o L L L L
- 1 L L L H
0A tht 0c co 2 L L H L
CLEAR A 3 L L H H
A 4 L H L L
I 5 L H L H
6 L H H L
7 L H H H
I 8 H L L L
9 H L L H
CLEAR A 10 H L H L
0A tht ac thy 11 H L H H
12 H H L L
1 2 3 4 s 6 T 13 H H L H
14 H H H L
" , 10A 103 10c tttD GND 15 H H H H
CLEAR "--------'
OUTPUTS H = High Logic Level
TL/FIS434-1 L = LOW Logic Level
Order Number DM74L3393M or DM74LS393N
See NS Package Number MMA or N14A
Absolute Maximum Ratings (Note)
If Mllltary/Aerospace speclfled devlces are required,
please contact the National Semiconductor Sales
Offlce/Dlstrlbutore for availability and trpettifleatlons.
Supply Voltage 7V
Input Voltage
Clear 7V
A 5.5V
Operating Free Air Temperature Range
DM74LS 0°C to + 70'C
Storage Temperature Range -65''C to + 150°C
Recommended Operating Conditions
Note: The "Absolute Maximum Ratings" are those values
beyond which the safety of the device cannot be guaran-
teed. The device should not be operated at these limits. The
parametric values tieftrted in the ‘Electrical Characteristics"
table are not guaranteed at the absolute maximum ratings.
The ''RtatxtmmertdBd Operating Conditions" table will define
the conditions for actual device operation.
Symbol Parameter DM74LS393 Unlts
Mln Nam Max
Vcc Supply Voltage 4.75 5 5.25 V
VIH High Level Input Voltage 2 V
" Low Level Input Voltage 0.8 V
IOH High Level Output Current - 0.4 mA
lor. Low Level Output Current 8 mA
fCLK Clock Frequency (Note 1) 25 MHz
fCLK Clock Frequency (Note 2) 0 20 MHz
tw Pulse Width (Note 7) A 20 ns
Clear High 20
tREL Clear Release Time (Notes 3 & 7) 25 l ns
TA Free Air Operating Temperature 0 70 ''C
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Condltlons Mln (Note 4) Max Unlts
VI InputClamp Voltage Vcc = Min, l. = --18 mA -1.5 V
VOH High Level Output Vcc = Min, IOH = Max 2.7 3 4 V
Voltage " = Max, " = Min . .
VOL Low LeveiOutput Vcc = Min, kx = Max o 35 0 5
Voltage " = Max, VIH = Min . . V
IOL = 4 mA, Vcc = Min 0.25 0.4
II InputCurrent ti? Max Vcc = Max, V. = 7V Clear 0.1 mA
InputVoltatw Vcc = Max, v. = 5.5V A 0.2
llH High Level Input VCC == Max, V. = 2.7V Clear 20 HA
Current A 40
IIL Low Level Input VCC = Max, V. = 0.4V Clear -0.4
Current mA
A -I.6
kos Short Circuit VCC = Max - _
Output Current (Note 5) 20 100 mA
ICC Supply Current Vcc = Max (Note 6) 15 26 mA
Note 1: ck. = 15 pF, RL = 2 m. TA = 25'C and Vcc = sv.
Note P. Cc = so pF, RL - 2 kn, TA - 290 and Vcc = 5v.
Note 3: The symbol il) indicates that the falling edge of the clear pulse is used for reference.
Note 4: All typicals are at Vcc = W, TA = 25'C,
Note S: Not more than one output should be shorted at a time, and the duration should not exceed one second.
Note 6: leg is measured with all outputs open. both CLEAR inputs grounded !ollowing momentary connection to 4.5V. and all other inputs grounded.
Note 7: TA - 25'C, and Va: = w.
Switching Characteristics at Va: = 5V and TA = 25'C (See Section 1 for Test Waveforms and Output Load)
Ri. = 2 kn
Symbol Parameter me (Input) th. = " pF th. = so pF Units
Tet (Output) Mln Max Min Max
fMAx Maximum Clock A to 25 20 MHz
Frequency QA
tpLH Propagation Delay Time A to
Low to High Level Output GA 20 24 ns
tpHL Propagation Delay Time A to 30 ns
High to Low Level Output 0A
tPLH Propagation Delay Time A to 87 ns
Low to High Level Output 00
tpHL Propagation Delay Time A to
High to Low Level Output th, 60 87 ns
tpHL Propagation Delay Time Clear to 39 45 ns
High to Low Level Output Any tl
Logic Diagram
t3, Ill OUTPUT
tt, 13) A 0A
INPUT A a'--"---) T
Ga ta, IO) OUTPUT
l ts, 9) OUTPUT
At "e---- ac
ith 8) OUTPUT
CLEAR i2, ‘2)D 9
TL/F/6434-2
This datasheet has been :
www.ic-phoenix.com
Datasheets for electronic components.
National Semiconductor was acquired by Texas Instruments.
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This file is the datasheet for the following electronic components:
DM74LS393M - product/dm74|3393m?HQS=T|-nu|I-nu|I-dscataIog-df-pf-nuIl-wwe
DM74LS393N - product/dm74ls393n?HQS=T|-nu|I-nu|I-dscataIog-df-pf-null-wwe
