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SN74ALS677ADWR Datasheet(PDF) 5 Page - Texas Instruments

No. de pieza SN74ALS677ADWR
Descripción Electrónicos  16-BIT ADDRESS COMPARATOR
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SN74ALS677ADWR Datasheet(HTML) 5 Page - Texas Instruments

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SN74ALS677A
16BIT ADDRESS COMPARATOR
SDAS012C − JUNE 1982 − REVISED JANUARY 1995
5
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
POST OFFICE BOX 1443
HOUSTON, TEXAS 77251−1443
APPLICATION INFORMATION
The SN74ALS677A can be wired to recognize any one of 216 addresses. The number of lows in the address
determines the input pattern for the P inputs. Those system address lines that are low in the address to be recognized
are connected to the lowest-numbered A inputs of the address comparator. The system address lines that are high
are connected to the highest-numbered A inputs.
For example, assume the comparator is to enable a device when the 16-bit system address is:
A15 A14 A13 A12
A11
A10
A9
A8
A7
A6
A5
A4
A3
A2
A1
A0
H
H
L
L
H
H
L
L
HH
L
L
HHHH
Because the address contains six lows and ten highs, the following connections are made:
P3 to 0 V, P2 to V
CC, P1 to VCC, and P0 to 0 V
System address lines A13, A12, A9, A8, A5, and A4 to comparator inputs A1 through A6 in any
convenient order
The remaining ten system address lines to comparator inputs A7 through A16 in any convenient order
The output provides an active-low enabling signal.
Figure 1 shows a modulo-N synchronous counter. The
′ALS163B provides a low-level clear signal when N = FEFF16.
CLR
CLK
CLK
1R
C1/+
CTR 16
Four
′ALS163B
Maximum
Count
EN
0
3
P0
P1
P2
P3
VCC
G
P
[P = 1]
[ADDRESS
COMP]
A1
A2 − A16
FEFF16 = HHHH HHHL HHHH HHHH
15
12
8
4
0
9...15
8
0...7
SN74ALS677A
8
715
Figure 1. Modulo-N Synchronous Counter


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