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參數(shù)資料
| 型號(hào)： | MC74HC254A |
| 廠商： | Motorola, Inc. |
| 英文描述： | Octal 3-State Noninverting Buffer Transceiver |
| 中文描述： | 八路三態(tài)收發(fā)器同相緩沖 |
| 文件頁數(shù)： | 1/7頁 |
| 文件大?。?/td> | 149K |
| 代理商： | MC74HC254A |
SEMICONDUCTOR TECHNICAL DATA
1
REV 7
Motorola, Inc. 1997
2/97
High–Performance Silicon–Gate CMOS
The MC54/74HC245A is identical in pinout to the LS245. The device
inputs are compatible with standard CMOS outputs; with pullup resistors,
they are compatible with LSTTL outputs.
The HC245A is a 3–state noninverting transceiver that is used for 2–way
asynchronous communication between data buses. The device has an
active–low Output Enable pin, which is used to place the I/O ports into
high–impedance states. The Direction control determines whether data
flows from A to B or from B to A.
Output Drive Capability: 15 LSTTL Loads
Outputs Directly Interface to CMOS, NMOS, and TTL
Operating Voltage Range: 2 to 6 V
Low Input Current: 1
μ
A
High Noise Immunity Characteristic of CMOS Devices
In Compliance with the Requirements Defined by JEDEC Standard
No. 7A
Chip Complexity: 308 FETs or 77 Equivalent Gates
LOGIC DIAGRAM
A
DATA
PORT
A8
A7
A6
A5
A3
A4
A2
A1
9
8
7
6
5
4
3
2
DIRECTION
OUTPUT ENABLE
1
19
PIN 10 = GND
PIN 20 = VCC
18
17
16
15
14
13
12
11
B1
B2
B3
B4
B5
B6
B7
B8
B
DATA
PORT
FUNCTION TABLE
Control Inputs
Operation
Output
Enable
Direction
L
L
Data Transmitted from Bus B to Bus A
L
H
Data Transmitted from Bus A to Bus B
H
X
Buses Isolated (High–Impedance State)
X = don’t care
PIN ASSIGNMENT
A5
A3
A2
A1
DIRECTION
GND
A8
A7
A6
A4
5
4
3
2
1
10
9
8
7
6
14
15
16
17
18
19
20
11
12
13
B3
B2
B1
OUTPUT ENABLE
VCC
B8
B7
B6
B5
B4
DW SUFFIX
SOIC PACKAGE
CASE 751D–04
N SUFFIX
PLASTIC PACKAGE
CASE 738–03
ORDERING INFORMATION
MC54HCXXXAJ
MC74HCXXXAN
MC74HCXXXADW
Ceramic
Plastic
SOIC
J SUFFIX
CERAMIC PACKAGE
CASE 732–03
1
20
1
20
1
20
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|---|---|
| MC74HC257D | 制造商:Motorola Inc 功能描述: |
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| MC74HC257FR2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
| MC74HC257N | 制造商:Motorola Inc 功能描述: |
| MC74HC257ND | 制造商:Motorola Inc 功能描述: |
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