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PDF DM74LS491 Data sheet ( Hoja de datos )
| Número de pieza | DM74LS491 | |
| Descripción | 10-Bit Counter | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de DM74LS491 (archivo pdf) en la parte inferior de esta página. Total 4 Páginas | ||
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July 1989
DM54LS491 74LS491 10-Bit Counter
General Description
The ten-bit counter can count up count down set and load
2 LSB’s 2 MSB’s and 6 middle bits high or low as a group
All operations are synchronous with the clock SET over-
rides LOAD COUNT and HOLD LOAD overrides COUNT
COUNT is conditional on CIN otherwise it holds
All outputs are enabled when OE is low otherwise HIGH-Z
The 24 mA IOL outputs are suitable for driving RAM PROM
address lines in video graphics systems
Features Benefits
Y CRT vertical and horizontal timing generation
Y Bus-structured pinout
Y 24-pin SKINNYDIP saves space
Y TRI-STATE outputs drive bus lines
Y Low current PNP inputs reduce loading
Connection Diagram
Standard Test Load
Top View
TL L 8332 – 2
TL L 8332 – 1
Order Number DM54LS491J
DM74LS491J or DM74LS491N
See NS Package Number J24F or N24C
Function Table
OE CK SET LD CNT CIN UP D9-D0 Q9-Q0 Operation
HX X X X XX
Lu H X X X X
Lu L L X X X
Lu L H H X X
Lu L H L H X
Lu L H L L L
Lu L H L L H
X Z Hi-Z
X H Set all HIGH
D D LOAD D
X Q HOLD
X Q HOLD
X Q plus 1 Count UP
X Q minus 1 Count DN
TRI-STATE is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation TL L 8332
RRD-B30M115 Printed in U S A
1 page | ||
| Páginas | Total 4 Páginas | |
| PDF Descargar | [ Datasheet DM74LS491.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| DM74LS491 | 10-Bit Counter | National Semiconductor |
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