|
|
PDF 74LS90 Data sheet ( Hoja de datos )
| Número de pieza | 74LS90 | |
| Descripción | Decade and Binary Counters | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
|
 1. - Decade Counter - SN74LS90  Hay una vista previa y un enlace de descarga de 74LS90 (archivo pdf) en la parte inferior de esta página. Total 10 Páginas | ||
|
No Preview Available !
June 1989
DM74LS90 DM74LS93
Decade and Binary Counters
General Description
Each of these monolithic counters contains four master-
slave flip-flops and additional gating to provide a divide-by-
two counter and a three-stage binary counter for which the
count cycle length is divide-by-five for the ’LS90 and divide-
by-eight for the ’LS93
All of these counters have a gated zero reset and the LS90
also has gated set-to-nine inputs for use in BCD nine’s com-
plement applications
To use their maximum count length (decade or four bit bina-
ry) the B input is connected to the QA output The input
count pulses are applied to input A and the outputs are as
described in the appropriate truth table A symmetrical di-
vide-by-ten count can be obtained from the ’LS90 counters
by connecting the QD output to the A input and applying the
input count to the B input which gives a divide-by-ten square
wave at output QA
Features
Y Typical power dissipation 45 mW
Y Count frequency 42 MHz
Connection Diagrams (Dual-In-Line Packages)
TL F 6381 – 1
Order Number DM74LS90M or DM74LS90N
See NS Package Number M14A or N14A
TL F 6381 – 2
Order Number DM74LS93M or DM74LS93N
See NS Package Number M14A or N14A
C1995 National Semiconductor Corporation TL F 6381
RRD-B30M105 Printed in U S A
1 page  
’LS93 Electrical Characteristics
over recommended operating free air temperature range (unless otherwise noted) (Continued)
Symbol
Parameter
Conditions
Min Typ Max Units
(Note 1)
IIL
Low Level Input
VCC e Max VI e 0 4V
Reset
Current
A
b0 4
b2 4
mA
B b1 6
IOS Short Circuit
Output Current
VCC e Max (Note 2)
b20
b100
mA
ICC Supply Current
VCC e Max (Note 3)
9 15 mA
Note 1 All typicals are at VCC e 5V TA e 25 C
Note 2 Not more than one output should be shorted at a time and the duration should not exceed one second
Note 3 ICC is measured with all outputs open both RO inputs grounded following momentary connection to 4 5V and all other inputs grounded
Note 4 QA outputs are tested at IOL e max plus the limit value of IIL for the B input This permits driving the B input while maintaining full fan-out capability
’LS93 Switching Characteristics
at VCC e 5V and TA e 25 C (See Section 1 for Test Waveforms and Output Load)
Symbol
Parameter
From (Input)
To (Output)
RL e 2 kX
CL e 15 pF
CL e 50 pF
Min Max Min Max
fMAX
tPLH
Maximum Clock
Frequency
Propagation Delay Time
Low to High Level Output
A to QA
B to QB
A to QA
32 20
16 10
16 20
tPHL
Propagation Delay Time
High to Low Level Output
A to QA
18 24
tPLH
Propagation Delay Time
Low to High Level Output
A to QD
70 85
tPHL
Propagation Delay Time
High to Low Level Output
A to QD
70 90
tPLH
Propagation Delay Time
Low to High Level Output
B to QB
16 23
tPHL
Propagation Delay Time
High to Low Level Output
B to QB
21 30
tPLH
Propagation Delay Time
Low to High Level Output
B to QC
32 37
tPHL
Propagation Delay Time
High to Low Level Output
B to QC
35 44
tPLH
Propagation Delay Time
Low to High Level Output
B to QD
51 60
tPHL
Propagation Delay Time
High to Low Level Output
B to QD
51 70
tPHL Propagation Delay Time SET-0 to
High to Low Level Output
Any Q
40 52
Units
MHz
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet 74LS90.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| 74LS90 | Decade and Binary Counters | National Semiconductor |
| 74LS90 | Decade and Binary Counters |  Fairchild Semiconductor |
| 74LS90 | DECADE COUNTER; DIVIDE-BY-TWELVE COUNTER; 4-BIT BINARY COUNTER |  Motorola Semiconductors |
| 74LS91 | 8 Bit SHift Registers |  Raytheon |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |