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DM54LS491 Folha de dados(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças DM54LS491
Descrição Electrónicos  10-Bit Counter
Download  4 Pages
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM54LS491 Folha de dados(HTML) 1 Page - National Semiconductor (TI)

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TLL8332
July 1989
DM54LS49174LS491 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 RAMPROM
address lines in video graphics systems
FeaturesBenefits
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
Top View
TLL8332 – 1
Order Number DM54LS491J
DM74LS491J or DM74LS491N
See NS Package Number J24F or N24C
Standard Test Load
TLL8332 – 2
Function Table
OE CK SET LD CNT CIN UP D9-D0 Q9-Q0
Operation
H
X
X
X
X
X
X
X
Z
Hi-Z
L
u H X X
X
X
X
H
Set all HIGH
L
u L L
X
X
X
D
D
LOAD D
L
u L H H
X
X
X
Q
HOLD
L
u L H L
H
X
X
Q
HOLD
L
u L H L
L
L
X
Q plus 1 Count UP
L
u L H L
L
H
X
Q minus 1 Count DN
TRI-STATE
is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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