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參數(shù)資料
| 型號： | 74HCT85 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | 4-bit magnitude comparator(8位相同比較器) |
| 中文描述： | 4位數(shù)值比較器（8位相同比較器） |
| 文件頁數(shù)： | 2/9頁 |
| 文件大?。?/td> | 69K |
| 代理商： | 74HCT85 |
December 1990
2
Philips Semiconductors
Product specification
4-bit magnitude comparator
74HC/HCT85
FEATURES
Serial or parallel expansion without extra gating
Magnitude comparison of any binary words
Output capability: standard
I
CC
category: MSI
GENERAL DESCRIPTION
The 74HC/HCT85 are high-speed Si-gate CMOS devices
and are pin compatible with low power Schottky TTL
(LSTTL). They are specified in compliance with JEDEC
standard no. 7A.
The 74HC/HCT85 are 4-bit magnitude comparators that
can be expanded to almost any length. They perform
comparison of two 4-bit binary, BCD or other monotonic
codes and present the three possible magnitude results at
the outputs (Q
A
>
B
, Q
A=B
and Q
A
<
B
). The 4-bit inputs are
weighted (A
0
to A
3
and B
0
to B
3
), where A
3
and B
3
are the
most significant bits.
The operation of the “85” is described in the function table,
showing all possible logic conditions. The upper part of the
table describes the normal operation under all conditions
that will occur in a single device or in a series expansion
scheme. In the upper part of the table the three outputs are
mutually exclusive. In the lower part of the table, the
outputs reflect the feed forward conditions that exist in the
parallel expansion scheme.
For proper compare operation the expander inputs (I
A
>
B
,
I
A=B
and I
A
<
B
) to the least significant position must be
connected as follows: I
A
<
B
= I
A
>
B
= = LOW and
I
A=B
= HIGH.
For words greater than 4-bits, units can be cascaded by
connecting outputs Q
A
<
B
, Q
A
>Β
and Q
A=B
to the
corresponding inputs of the significant comparator.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
= 6 ns
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W):
P
D
= C
PD
×
V
CC2
×
f
i
+ ∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz
f
o
= output frequency in MHz
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs
C
L
= output load capacitance in pF
V
CC
= supply voltage in V
For HC the condition is V
I
= GND to V
CC
For HCT the condition is V
I
= GND to V
CC
1.5 V
2.
ORDERING INFORMATION
See
“74HC/HCT/HCU/HCMOS Logic Package Information”
.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
HC
HCT
t
PHL/
t
PLH
propagation delay
A
n
, B
n
to Q
A
>
B
, Q
A
<
B
A
n
, B
n
to Q
A=B
I
A
<
B,
, I
A=B
, I
A
>
B
to Q
A
<
B
, Q
A
>
B
I
A=B
to Q
A=B
input capacitance
power dissipation capacitance per package
C
L
= 15 pF; V
CC
= 5 V
20
18
15
11
3.5
18
22
20
15
15
3.5
20
ns
ns
ns
ns
pF
pF
C
I
C
PD
notes 1 and 2
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| 74HCT85D | 功能描述:校驗器 IC 4-BIT MAGNITUDE COMPARATOR RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| 74HCT85D,652 | 功能描述:校驗器 IC 4-BIT MAGNITUDE RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| 74HCT85D,653 | 功能描述:校驗器 IC 4-BIT MAGNITUDE RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| 74HCT85D652 | 制造商:NXP Semiconductors 功能描述:IC 4BIT MAGNITUDE COMPARATOR SOIC-16 |
| 74HCT85DB | 功能描述:校驗器 IC 4-BIT MAGNITUDE COMPARATOR RoHS:否 制造商:STMicroelectronics 產品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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