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參數資料
| 型號： | MC74HC257N |
| 廠商： | MOTOROLA INC |
| 元件分類： | 通用總線功能 |
| 英文描述： | Quad 2-Input Data Selector/Multiplexer with 3-State Outputs |
| 中文描述： | HC/UH SERIES, QUAD 2 LINE TO 1 LINE MULTIPLEXER, TRUE OUTPUT, PDIP16 |
| 封裝： | PLASTIC, DIP-16 |
| 文件頁數： | 3/6頁 |
| 文件大小： | 175K |
| 代理商： | MC74HC257N |
MC74HC257
High–Speed CMOS Logic Data
DL129 — Rev 6
3
MOTOROLA
tPHL
(Figures 1 and 4)
4.5
20
30
6.0
17
25
26
tPLZ,
Maximum Propagation Delay, Output Enable to Output Y
2.0
150
190
21
225
ns
tPZH
(Figures 3 and 5)
4.5
30
45
6.0
10
38
15
Cin
Cout
Maximum Input Capacitance
—
10
13
10
pF
Maximum Three–State Output Capacitance
—
15
10
15
pF
1. For propagation delays with loads other than 50 pF, see Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D).
2. Information on typical parametric values can be found in Chapter 2 of the Motorola High–Speed CMOS Data Book (DL129/D).
15
CPD
Power Dissipation Capacitance (Per Package)*
* Used to determine the no–load dynamic power consumption: PD = CPD VCC2f + ICC VCC. For load considerations, see Chapter 2 of the
Motorola High–Speed CMOS Data Book (DL129/D).
Typical @ 25
°
C, VCC = 5.0 V
39
pF
PIN DESCRIPTIONS
INPUTS
A0, A1, A2, A3 (Pins 2, 5, 11, 14)
Nibble A input. The data present on these pins is trans-
ferred to the output when the Select input is at a low level and
the Output Enable input is at a low level. The data is pres-
ented to the outputs in noninverted form.
B0, B1, B2, B3 (Pins 3, 6, 10, 13)
Nibble B input. The logic data present on these pins is
transferred to the output when the Select input is at a high
level and the Output Enable input is at a low level. The data
is presented to the outputs in noninverted form.
OUTPUTS
Y0, Y1, Y2, Y3 (Pins 4, 7, 9, 12)
Nibble output. The selected nibble input is presented at
these outputs when the Output Enable input is at a low level.
For the Output Enable input at a high level, the outputs are
switched to the high impedance state.
CONTROL INPUTS
Select (Pin 1)
Nibble select. This input determines the nibble to be trans-
ferred to the outputs. A low level on this input selects the A
inputs and a high level selects the B inputs.
Output Enable (Pin 15)
Output Enable. A low level on this input allows the selected
input data to be presented at the outputs. A high level on this
input forces the outputs into the high–impedance state.
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相關代理商/技術參數 |
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|---|---|
| MC74HC257ND | 制造商:Motorola Inc 功能描述: |
| MC74HC259ADG | 功能描述:編碼器、解碼器、復用器和解復用器 IC MULTIPLEXER 3ST 8INPUT RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MC74HC259ADR2G | 功能描述:編碼器、解碼器、復用器和解復用器 IC MULTIPLEXER RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MC74HC259ADTG | 功能描述:編碼器、解碼器、復用器和解復用器 IC MULTIPLEXER 3ST 8INPUT RoHS:否 制造商:Micrel 產品:Multiplexers 邏輯系列:CMOS 位數: 線路數量（輸入/輸出）:2 / 12 傳播延遲時間:350 ps, 400 ps 電源電壓-最大:2.625 V, 3.6 V 電源電壓-最小:2.375 V, 3 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| MC74HC259ADTR2 | 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:ON Semiconductor 功能描述: |
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