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參數資料
| 型號： | MC74HC253N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Dual 4-Input Data Selector/Multiplexer with 3-State Outputs |
| 中文描述： | HC/UH SERIES, DUAL 4 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數： | 4/5頁 |
| 文件大?。?/td> | 186K |
| 代理商： | MC74HC253N |
MC74HC253
MOTOROLA
High–Speed CMOS Logic Data
DL129 — Rev 6
4
TEST CIRCUITS
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 3.
* Includes all probe and jig capacitance
CL*
TEST POINT
DEVICE
UNDER
TEST
OUTPUT
Figure 4.
CONNECT TO VCC WHEN
TESTING tPLZ AND tPZL.
CONNECT TO GND WHEN
TESTING tPHZ AND tPZH.
1 k
PIN DESCRIPTIONS
DATA INPUTS
D0a – D3a, D0b – D3b (Pins 3, 4, 5, 6, 10, 11, 12, 13)
Data inputs. When one of these pairs of inputs is selected
and the outputs are enabled, the outputs assume the state of
the respective inputs.
CONTROL INPUTS
A0, A1 (Pins 2, 14)
Address inputs. These inputs select the pair of Data inputs
to appear at the corresponding outputs.
Output Enable (Pins 1, 15)
Active–low three–state Output Enable. When a low level is
applied to these inputs, the corresponding outputs are en-
abled. When a high level is applied, the outputs assume the
high–impedance state.
OUTPUTS
Ya, Yb (Pins 7, 9)
Noninverting three–state outputs.
LOGIC DETAIL
DATA–WORD a
INPUTS
D0a
D1a
D2a
D3a
6
5
4
3
DATA–WORD b
INPUTS
D0b
D1b
D2b
D3b
10
11
12
13
A1
A0
2
14
ADDRESS
INPUTS
OUTPUT
ENABLE
a
OUTPUT
ENABLE
b
1
15
VCC
VCC
7
9
Ya
Yb
NOINVERTING
OUTPUTS
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