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參數(shù)資料
| 型號(hào)： | 933739580623 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 算術(shù)邏輯單元 |
| 英文描述： | F/FAST SERIES, 8-BIT IDENTITY COMPARATOR, INVERTED OUTPUT, PDSO20 |
| 封裝： | 7.50 MM, PLASTIC, MS-013AC, SOT-163-1, SO-20 |
| 文件頁(yè)數(shù)： | 2/8頁(yè) |
| 文件大?。?/td> | 89K |
| 代理商： | 933739580623 |
Philips Semiconductors
Product specification
74F521
8-bit identity comparator
2
May 15, 1990
853–0372 99601
FEATURES
Compares two 8-bit words in 6.5ns typical
Expandable to any word length
DESCRIPTION
The 74F521 is an expandable 8-bit comparator. It compares two
words of up to 8 bits each and provides a Low output when the two
words match bit for bit. The expansion input IA=B also serves as an
active-Low enable input.
TYPE
TYPICAL
PROPAGATION
DELAY
TYPICAL
SUPPLY CURRENT
(TOTAL)
74F521
7.0ns
24mA
PIN CONFIGURATION
SF00273
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
IA=B
A0
B0
A1
B1
A2
B2
A3
B3
GND
VCC
QA=B
B7
A7
B6
A6
B5
B4
A5
A4
ORDERING INFORMATION
DESCRIPTION
COMMERCIAL RANGE
VCC = 5V ±10%, Tamb = 0°C to +70°C
PKG DWG #
20-pin plastic DIP
N74F521N
SOT146-1
20-pin plastic SOL
N74F521D
SOT163-1
INPUT AND OUTPUT LOADING AND FAN-OUT TABLE
PINS
DESCRIPTION
74F (U.L.) HIGH/LOW
LOAD VALUE HIGH/LOW
A0 – A7
Word A inputs
1.0/1.0
20
A/0.6mA
B0 – B7
Word B inputs
1.0/1.0
20
A/0.6mA
IA=B
Expansion or Enable input (active Low)
1.0/1.0
20
A/0.6mA
QA=B
Identity output (active Low)
50/33
1.0mA/20mA
NOTE: One (1.0) FAST unit load is defined as: 20
A in the High state and 0.6mA in the Low state.
LOGIC SYMBOL
QA=B
19
VCC = Pin 20
GND = Pin 10
SF00274
2
3
4
5
6
7
8
9
11
12
13
14
15
A0
B0
A1
B1
A2
B2
A3
B3
A4
B4
A5
B5
A6
16
17
18
B6
A7
B7
IA=B
1
IEC/IEEE SYMBOL
SF00275
COMP
19
2
4
6
8
11
13
15
17
0
3
A=B
A
3
5
7
9
12
14
15
18
0
7
B
1
EN
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