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參數(shù)資料
| 型號： | SN54AS866 |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | 8-BIT MAGNITUDE COMPARATORS |
| 中文描述： | 8位震級比較器 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 115K |
| 代理商： | SN54AS866 |
SN54AS866, SN74AS866A
8-BIT MAGNITUDE COMPARATORS
SDAS183A – DECEMBER 1982 – REVISED JUNE 1990
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Copyright
1990, Texas Instruments Incorporated
1
Package Options Include Plastic Small
Outline Packages, Both Plastic and Ceramic
Chip Carriers, and Standard Plastic and
Ceramic DIPs
Input and Output Latches with Active-High
Enables
Fast Compare to Zero
Arithmetic and Logical Comparison
Open-Collector P = Q Output
description
These Advanced Schottky devices are capable of
performing high-speed arithmetic or logical
comparisons on two 8-bit binary or two’s
complement
words.
decisions about words P and Q are externally
available at the outputs. These devices are fully
expandable to any word length by connecting the
totem pole P>Q and P<Q outputs of each stage to
the P>Q and P<Q inputs of the next higher-order
stage. The cascading paths are implemented with
only a two-gate-level delay to reduce overall
comparison times for long words. The open-
collector P=Q output may be wire-ANDed
together.
Three
fully
decoded
Both input words P and Q plus all three outputs
(P>Q, P<Q, and P = Q) are equipped with latches
to provide the designer with temporary data
storage for avoiding race conditions. The enable
circuitry is implemented with minimal delay times
to enhance performance when the devices are
cascaded for longer word lengths. Each latch is
transparent when the appropriate latch enable,
PLE, QLE, or OLE is high.
The enable inputs PLE and QLE and data inputs
P and Q utilize pnp input transistors to reduce the
low-level input current requirement to typically
–0.25 mA, which minimizes loading effects.
The Q register may be cleared to zero for a fast comparison of the P word to zero.
The SN54AS866 is characterized for operation over the full military temperature range of –55
°
C to 125
°
C. The
SN74AS866A is characterized for operation from 0
°
C to 70
°
C.
SN54AS866 . . . JD PACKAGE
SN74AS866A . . . N PACKAGE
(TOP VIEW)
SN54AS866 . . . FK PACKAGE
SN74AS866A . . . FN PACKAGE
(TOP VIEW)
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13
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28
27
26
25
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16
15
QLE
L/A
p < Qin
P > Qin
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
P = Qout
GND
V
CC
CLRQ
PLE
P7
P6
P5
P4
P3
P2
P1
P0
P < Qout
P > Qout
OLE
3 2 1
13 14
5
6
7
8
9
10
11
P7
P6
P5
P4
P3
P2
P1
Q7
Q6
Q5
Q4
Q3
Q2
Q1
4
15 16 17 18
P
G
O
P
P
P
P
P
L
Q
28 27 2625
24
23
22
21
20
19
12
Q
C
P
C
UNLESS OTHERWISE NOTED this document contains PRODUCTION
DATA information current as of publication date. Products conform to
specifications per the terms of Texas Instruments standard warranty.
parameters.
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