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| 型號(hào)： | SM74ALS521N |
| 廠商： | Fairchild Semiconductor Corporation |
| 英文描述： | 8-Bit Comparator |
| 中文描述： | 8位比較 |
| 文件頁(yè)數(shù)： | 1/5頁(yè) |
| 文件大?。?/td> | 51K |
| 代理商： | SM74ALS521N |
2000 Fairchild Semiconductor Corporation
DS006114
www.fairchildsemi.com
September 1986
Revised April 2000
D
DM74ALS520
DM74ALS521
8-Bit Comparator
General Description
These comparators perform an “equal to” comparison of
two 8-bit words with provision for expansion or external
enabling. The matching of the two 8-bit input plus a logic
LOW on the EN input produces the output A
=
B on the
DM74ALS520 and DM74ALS521. The DM74ALS520 and
DM74ALS521 have totem pole outputs for wire AND cas-
cading. Additionally, the DM74ALS520 is provided with B
input pull up termination resistors for analog or switch data.
Features
I
Switching specifications at 50 pF
I
Switching specifications guaranteed over full tempera-
ture and V
CC
range
I
Advanced oxide-isolated, ion-implanted Schottky TTL
process
I
Functionally and pin for pin compatible with LS family
counterpart
I
Improved output transient handling capability
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix letter
“
X
”
to the ordering code.
Connection Diagram
Function Table
H
=
HIGH Logic Level
L
=
LOW Logic Level
X
=
Don't Care
Ordering Code
DM74ALS520WM
DM74ALS520N
DM74ALS521WM
SM74ALS521N
Package Number
M20B
N20A
M20B
N20A
Package Description
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
20-Lead Small Outline Integrated Circuit (SOIC), JEDEC MS-013, 0.300 Wide
20-Lead Plastic Dual-In-Line Package (PDIP), JEDEC MS-001, 0.300 Wide
Inputs
Output
EN
L
L
H
Data
A
=
B
A
≠
B
X
A
=
B
L
H
H
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