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DM74LS469J Folha de dados(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Nome de Peças DM74LS469J
Descrição Electrónicos  DM54LS469/DM74LS469 8-Bit Up/Down Counter
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Fabricante Electrônico  NSC [National Semiconductor (TI)]
Página de início  http://www.national.com
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TLL8333
July 1989
DM54LS469DM74LS469 8-Bit UpDown Counter
General Description
The ‘LS469 is an 8-bit synchronous updown counter with
parallel load and hold capability Three function-select in-
puts (LD UD CBI) provide one of four operations which
occur synchronously on the rising edge of the clock (CK)
The LOAD operation loads the inputs (D7–D0) into the out-
put register (Q7–Q0) The HOLD operation holds the previ-
ous value regardless of clock transitions The INCREMENT
operation adds one to the output register when the carry-in
input is TRUE (CBIeLOW) otherwise the operation is a
HOLD The carry-out (CBO) is TRUE (CBOeLOW) when
the output register (Q7–Q0) is all HIGHs otherwise FALSE
(CBOeHIGH) The DECREMENT operation subtracts one
from the output register when the borrow-in input is TRUE
(CBIeLOW) otherwise the operation is a HOLD The bor-
row-out (CBO) is TRUE (CBOeLOW) when the output reg-
ister (Q7–Q0) is all LOWs otherwise FALSE (CBOeHIGH)
The output register (Q7–Q0) is enabled when OE is LOW
and disabled (HI-Z) when OE is HIGH The output drivers
will sink the 24 mA required for many bus-interface stan-
dards Two or more ‘LS469 octal updown counters may be
cascaded to provide larger counters
FeaturesBenefits
Y
8-bit updown counter for microprogram-counter DMA
controller and general-purpose counting applications
Y
8 bits matches byte boundaries
Y
Bus-structured pinout
Y
24-pin SKINNYDIP saves space
Y
TRI-STATE
outputs drive bus lines
Y
Low current PNP inputs reduce loading
Y
Expandable in 8-bit increments
Connection Diagram
Top View
TLL8333 – 1
Order Number DM54LS469J
DM74LS469J or DM74LS469N
See NS Package Number J24F or N24C
Standard Test Load
TLL8333 – 3
Function Table
OE CK LD UD CBI D7 – D0
Q7 – Q0
Operation
H
X
X
X
X
X
Z
HI-Z
L
u L
X
X
D
D
LOAD
L
u H
L
H
X
Q
HOLD
L
u H
L
L
X
Q plus 1
INCREMENT
L
u H H
H
X
Q
HOLD
L
u H H
L
X
Q minus 1 DECREMENT
TRI-STATE
is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation
RRD-B30M115Printed in U S A


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