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參數資料
| 型號： | MC74F640DW |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | OCTAL BUS TRANSCEIVER, INVERTING WITH 3-STATE OUTPUTS |
| 中文描述： | F/FAST SERIES, 8-BIT TRANSCEIVER, INVERTED OUTPUT, PDSO20 |
| 封裝： | SOIC-20 |
| 文件頁數： | 2/4頁 |
| 文件大小： | 84K |
| 代理商： | MC74F640DW |
H = High Voltage Level
L = Low Voltage Level
X = Don’t Care
Z = High Impedance “Off” State
4-238
FAST AND LS TTL DATA
OCTAL BUS TRANSCEIVER,
INVERTING WITH 3-STATE OUTPUTS
The MC74F640 is an octal transceiver featuring inverting 3-state bus com-
patible outputs in both transmit and receive directions. The B port outputs are
capable of sinking 64 mA and sourcing 15 mA, providing very good capacitive
drive characteristics. The device features an Output Enable (OE) input for
easy cascading and Transmit/Receive (T/R) input for direction control. The
3-state outputs, B0–B7, have been designed to prevent output bus loading if
the power is removed from the device.
High-Impedance NPN Base Inputs for Reduced Loading
(70
μ
A in High and Low States)
Ideal for Applications which Require High-Output Drive and Minimal
Bus Loading
Inverting Version of F245
Octal Bidirectional Bus Interface
3-State Buffer Outputs Sink 64 mA and Source 15 mA
ESD Sensitive — 4000 V HBM
PIN ASSIGNMENT
18
17
16
15
14
13
1
2
3
4
A2
5
6
7
A5
20
19
8
A6
VCC
T/R
OE
B0
B1
B2
B4
B3
B5
A0
A1
A3
A4
9
10
GND
A7
12
11
B6
B7
FUNCTION TABLE
Inputs
Outputs
OE
T/R
L
L
H
L
H
X
Bus B data to Bus A
Bus A data to Bus B
Z
MC74F640
OCTAL BUS TRANSCEIVER,
INVERTING WITH
3-STATE OUTPUTS
FAST
SCHOTTKY TTL
ORDERING INFORMATION
MC74FXXXJ
MC74FXXXN
MC74FXXXDW SOIC
Ceramic
Plastic
20
1
J SUFFIX
CERAMIC
CASE 732-03
20
1
N SUFFIX
PLASTIC
CASE 738-03
20
1
DW SUFFIX
SOIC
CASE 751D-03
LOGIC SYMBOL
A0
A1
A2
A3
A4
A5
A6
A7
B0
B1
B2
B3
B4
B5
B6
B7
T/R
OE
2
3
4
5
6
7
8
9
11
12
13
14
15
16
17
18
1
19
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相關代理商/技術參數 |
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