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DM74LS390N
7 V, dual 4-bit decade counter
[.8390
I National
Semiconductor
DM74LS390 Dual 4-Bit Decade Counter
General Description
Each of these monolithic circuits contains eight master-
slave flip-flops and additional gating to implement two indi-
vidual tour-bit counters in a single package. The 18390 in.
corporates dual divide-by-two and divide-by-five counters,
which can be used to implement cycle lengths equal to any
whole and/or cumulative multiples of 2 and/or 5 up to di-
vide-by-100. When connected as a bi-quinary counter, the
separate divide-by-two circuit can be used to provide sym-
metry (a square wave) at the final output stage. The 'LS390
has parallel outputs from each counter stage so that any
submultiple of the input count frequency is available for sys-
tem-timing signals.
Features
I: Dual version of the popular 1S90
" 'LS390 ... individual clocks for A and B flip-flops pro-
vide dual + 2 and + 5 counters
a Direct clear for each 4-bit counter
a Dual 4-bit version can significantly improve system den-
sities by reducing counter package count by 50%
a Typical maximum count frequency . . . 35 MHz
" Buffered outputs reduce possibility of collector commu-
tation
Connection Diagram
DuaMrt-Llne Package
OUTPUTS
2 OUTPUT ---r---
VCC 2A CLEAR 20A 28 2Ott 2t1C 200
" 15 I14 12 tt " 9
tttt I ea th: 00
CLEAR B
r 0A A 013 0c thy
1 " a 4 5 6 T la
1A , 10A " IDs Itttt 10;, GND
CLEAR OUTPUT --.-'sr.-_
OUTPUTS
TL/F/6439-1
Order Number DM74LS390M or DM74LS390N
See NS Package Number M16A or N16E
Function Tables
BCD Count Sequence
(Each Counter)
(See NoteA)
Count Outputs
00 A: 03 0A
o L L L L
1 L L L H
2 L L H L
3 L L H H
4 L H L L
5 L H L H
6 L H H L
7 L H H H
8 H L L L
9 H L L H
Bl-Qulnary (5-2)
(Each Counter)
(See Note B)
Count Outputs
0A 00 0c th,
(DmeUinhmM-‘O
IIIIIrrrrr
Il-l—rl—Irrl—l-
FIIFFFIIFP
f—Il—Irl—Il-Il—
Note A: Output a, is connected to input B tor BCD count
Note B: Output th, is connected to input A for BAluinary count.
Note c: H = High Level. L = Low Level.
Absolute Maximum Ratings (Note)
If MllitaryfAttrospatte apeertfled devlcas are required,
please contact the National Semiconductor Sales
omtttt/DItttrmutttrs for availability and sttettlfleatlttrttt.
Supply Voltage 7V
Input Voltage
Clear 7V
A or B 5.5V
Operating Free Air Temperature Range
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 defined in the "Electrical Characteristics"
table are not guaranteed at the absolute maximum ratings.
The "Rtttttmtmtttttmd Operating Conditions" table will define
the conditions for actual device operation.
DM74LS
Storage Temperature Range
trc to + 70'C
--65% to + 150°C
Recommended Operating Conditions
Symbol Parameter DMHLSM Units
Min Nom Max
Vcc Supply Voltage 4.75 5 5.25 V
VIH High Level Input Voltage 2 V
VIL Low Level Input Voltage 0.8 V
IOH High Level Output Current -0.4 mA
IOL Low Level Output Current 8 mA
fCLK Clock Frequency (Note 1) A to 0A 0 25 MHz
B to ths O 20
fCLK Clock Frequency (Note 2) A to GA 0 20 MHz
B to the 0 15
tw Pulse Width (Note I) A 20
B 25 ns
Clear High 20
1REL Clear Rehease Time (Notes 3 & 4) 25 l ns
TA Free Air Operating Temperature 0 70 "C
Note 1: h -- 15 pF, RL = 2 kn. TA --- 25''C and voc = 5v.
Note 2.. CL = 50 pF, RL = 2 kn, TA = 25~c and vac = 5v.
Note 3: The symbol (1) indcates the falling edge of the clear pulse is used tor reierence.
Note 4: TA = 25°C and vac --- SV.
Electrical Characteristics over recommended operating free air temperature range (unless otherwise noted)
Symbol Parameter Conditions Min (N121) Max Units
lh Input Clamp Voltage Vcc = Min, II = -18 mA --1.5 V
VOH High Level Output Vcc == Min, IOH = Max 2.7 3.4 V
Voltage " = Max,Vm = Min
VOL Low Level Output Vcc = Min, kx = Max 0.35 ty.5
Voltage " = Max.V.H = Min V
IOL = 4 mA, Vcc = Min 0.25 0.4
I. Input Current 48 Max Vcc = Max, VI = 7V Clear 0.1
InputVoltage Vcc = Max A 0.2 mA
v. = 5.5V B 0.4
IIH High Level Input Vcc = Max Clear 20
Current V. = 2.7V A 40 M
Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) (Continued)
Symbol Parameter Condltlons Mln Typ Max Urtlttt
(Note 1)
lit. Low Level Input Vcc = Max, VI = 0.4V Clear -0.4
Current A -1.6 mA
B --2.4
los Short Circuit Vcc == Max (Note 2) DM74 - 20 - 100 m A
Output Current
lcc Supply Current Voc = Max (Note 3) 15 26 mA
Note t; All typical: are at VCC = SV, TA = 25'C.
Not. 2: Not more than one output should be shorted at a time. and the duration should not exceed one second.
Note & '00 Is measured with all outputs Qpsn, both CLEAR inputs grounded following momentary connection to 4.5 and all other inputs grounded.
Switching Characteristics at Voc = 5V and TA = 25''C (See Section 1 for Test Waveforms and Output Load)
Ru = 2 kn
From (Input)
Symbol Parameter To (Output) A. = 15 pF th. = 50 pF Unlts
Mln Max Min Max
'MAX Maximum Clock A to 0A 25 20
mtlutmtty B to at, 20 15
1pm Propagation Delay Time
Low to High Level Output A to OA 20 24 ns
tpHL Propagation Delay Time
High to Low Level Output A to 0A 20 30 ns
tpLH Propagation Delay Time
Low to High Level Output A to tK 60 81 ns
tPHL Propagation Delay Time
High to Low Level Output A to QC 60 81 ns
tpLH Propagation Delay Time
Low to High Level Output B to ths 21 27 ns
tpHL Propagation Delay Time
High to Low Level Output B to QB 21 33 ns
tpLH Propagation Delay Time
Low to High Level Output B to QC 39 51 ns
tpHL Propagation Delay Time
High to Low Level Output B to ac 39 54 ns
tpLH Propagation Delay Time
Low to High Level Output B to th, 21 27 ns
tpHL Propagation Delay Time
High to Low Level Output B to GD 21 33 ns
tPHL Propagation Delay Time Clear to 39 45 ns
High to Low Level Output Any Q
Logic Diagram
INPUT A
INPUT B
ia, 13)owwwr
o '_.-..-.
(l, 15) A GA
tti, 11)
OUTPUT
ia, 12) [ 03 att
D-ar, -
le, 10)
A: g',"'"
aj, tt
Tic --
tr, 9)
OUTPUT
"1 On 00
- D-os, -
(2,14) 1 CLEAR
TL/F/8433-2
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:
DM74LS390M - product/dm74|3390m?HQS=T|-nu|I-nu|I-dscataIog-df-pf-nuIl-wwe
DM74LS390N - product/dm74ls390n?HQS=T|-nu|I-nu|I-dscataIog-df-pf-null-wwe
