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PDF DM74LS461 Data sheet ( Hoja de datos )

Número de pieza DM74LS461
Descripción Octal Counter
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! DM74LS461 Hoja de datos, Descripción, Manual

July 1989
DM54LS461 DM74LS461 Octal Counter
General Description
The LS461 is an 8-bit synchronous counter with parallel
load clear and hold capability Two function select inputs
(I0 I1) provide one of four operations which occur synchro-
nously on the rising edge of the clock (CK)
The LOAD operation loads the inputs (D7 – D0) into the out-
put register (Q7 – Q0) The CLEAR operation resets the out-
put register to all LOWs The HOLD operation holds the
previous value regardless of clock transitions The INCRE-
MENT operation adds one to the output register when the
carry-in input is TRUE (CI e LOW) otherwise the operation
is a HOLD The carry-out (CO) is TRUE (CO e LOW) when
the output register (Q7 – Q0) is all HIGHs otherwise FALSE
(CO e HIGH)
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 stand-
ards
Connection Diagram
Two or more LS461 octal counters may be cascaded to
provide larger counters The operation codes were chosen
such that when I1 is HIGH I0 may be used to select be-
tween LOAD and INCREMENT as in a program counter
(JUMP INCREMENT)
Features Benefits
Y Octal counter for microprogram-counter DMA controller
and general purpose counting applications
Y 8 bits match byte boundaries
Y Bus-structured pinout
Y 24-pin Skinny Dip saves space
Y TRI-STATE outputs drive bus lines
Y Low current PNP inputs reduce loading
Y Expandable in 8-bit increments
Standard Test Load
Top View
TL L 8334 – 2
TL L 8334 – 1
Order Number DM54LS461J
DM74LS461J or DM74LS461N
See NS Package Number J24F or N24C
Function Table
OE CK I1 I0 CI D7 – D0 Q7 – Q0 Operation
H X XXX X
Z
HI-Z
uL L L X X L CLEAR
L uLHX X
Q
HOLD
L uHL X D
D
LOAD
L uHHH X
Q
HOLD
uL H H L X Q plus 1 INCREMENT
TRI-STATE is a registered trademark of National Semiconductor Corp
C1995 National Semiconductor Corporation TL L 8334
RRD-B30M115 Printed in U S A

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