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DM7556J 데이터시트(PDF) 1 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
부품명 DM7556J
상세설명  TRI-STATE Programmable Binary Counters
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제조업체  NSC [National Semiconductor (TI)]
홈페이지  http://www.national.com
Logo NSC - National Semiconductor (TI)

DM7556J 데이터시트(HTML) 1 Page - National Semiconductor (TI)

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TLF6588
August 1989
DM7556DM8556 TRI-STATE
Programmable
Binary Counters
General Description
These circuits are synchronous edge-sensitive fully-pro-
grammable 4-bit counters The counters feature both con-
ventional totem-pole and TRI-STATE outputs such that
when the outputs are in the high impedance mode they can
be used to enter data from the bus lines In addition the
clear input operates completely independent of all other in-
puts During the programming operation data is loaded into
the flip-flops on the positive-going edge of the clock pulse
To facilitate cascading of these counters the MAX COUNT
output can be tied directly into the count enable input of the
next counter
Features
Y
Typical clock frequency 35 MHz
Y
TRI-STATE outputs
Y
Fully independent clear
Y
Synchronous loading
Y
Cascading circuitry provided internally
Connection Diagram
Dual-In-Line Package
TLF6588 – 1
Order Number DM7556J or DM8556N
See NS Package Number J16A or N16A
Function Table
Control Inputs
IO Ports
Active Outputs
LOAD
CE
CLK
OD
Reset
IOA
IOB
IOC
IOD
QA
QB
QC
QD
HX
X
L
H
L
L
L
L
L
L
L
L
HX
X
H
H
Z
Z
Z
ZL
L
L
L
HX
L
L
L
QA0
QB0
QC0
QD0
QA0
QB0
QC0 QD0
HX
L
H
L
Z
Z
Z
Z
QA0
QB0
QC0 QD0
LH
u
LL
a
b
c
d
A
B
C
D
HL
u
L
L
COUNT
COUNT
HL
u
H
L
Z
Z
Z
Z
COUNT
The IO pins are used as inputs when they are TRI-STATED and the LOAD input is Low They are outputs and active
when LOAD input is High and OD is Low
H e High Level (Steady State)
L e Low Level (Steady State)
X e Don’t Care including transitions
a b c d e The level of the steady state input at inputs A B C D respectively
QA0 QB0 QC0 QD0 e The level of QA QB QC QD respectively before the indicated steady state input conditions
were established
TRI-STATE
is a registered trademark of the National Semiconductor Corporation
C1995 National Semiconductor Corporation
RRD-B30M105Printed in U S A


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