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參數資料
| 型號： | CY74FCT257TQC |
| 廠商： | Texas Instruments, Inc. |
| 英文描述： | QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| 中文描述： | 四2輸入多路復用器與三態輸出 |
| 文件頁數： | 1/12頁 |
| 文件大小： | 330K |
| 代理商： | CY74FCT257TQC |
CY74FCT257T
QUAD 2-INPUT MULTIPLEXER
WITH 3-STATE OUTPUTS
SCCS019D – MAY 1994 – REVISED NOVEMBER 2001
1
POST OFFICE BOX 655303
DALLAS, TEXAS 75265
Function, Pinout, and Drive Compatible
With FCT and F Logic
Reduced V
OH
(Typically = 3.3 V) Version of
Equivalent FCT Functions
Edge-Rate Control Circuitry for
Significantly Improved Noise
Characteristics
I
off
Supports Partial-Power-Down Mode
Operation
Matched Rise and Fall Times
Fully Compatible With TTL Input and
Output Logic Levels
ESD Protection Exceeds JESD 22
– 2000-V Human-Body Model (A114-A)
– 200-V Machine Model (A115-A)
– 1000-V Charged-Device Model (C101)
64-mA Output Sink Current
32-mA Output Source Current
3-State Outputs
description
The CY74FCT257T has four identical two-input multiplexers that select four bits of data from two sources under
the control of a common data-select (S) input. The I
0
inputs are selected when S is low, and the I
1
inputs are
selected when S is high. Data at the output is noninverted.
The CY74FCT257T is a logic implementation of a four-pole, two-position switch, where the position of the switch
is determined by the logic levels at S. Outputs are in the high-impedance state when the output-enable (OE)
input is high.
All but one device must be in the high-impedance state to avoid currents exceeding the maximum ratings if
outputs are tied together. OE inputs must ensure that there is no overlap when outputs of 3-state devices are
tied together.
This device is fully specified for partial-power-down applications using I
off
. The I
off
circuitry disables the outputs,
preventing damaging current backflow through the device when it is powered down.
PIN DESCRIPTION
NAME
DESCRIPTION
I
Data inputs
S
Common data-select input
OE
Output-enable input (active low)
Y
Data outputs
Copyright
2001, Texas Instruments Incorporated
PRODUCTION DATA information is current as of publication date.
Products conform to specifications per the terms of Texas Instruments
standard warranty. Production processing does not necessarily include
testing of all parameters.
Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of
Texas Instruments semiconductor products and disclaimers thereto appears at the end of this data sheet.
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8
16
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14
13
12
11
10
9
S
I
0a
I
1a
Y
a
I
0b
I
1b
Y
b
GND
V
CC
OE
I
0c
I
1c
Y
c
I
0d
I
1d
Y
d
Q OR SO PACKAGE
(TOP VIEW)
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| CY74FCT257TQCT | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 1-of-2 Data Slct/Mltpx W/3St Otp 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 |
| CY74FCT257TQCTE4 | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 1-of-2 Data Slct/Mltpx W/3St Otp 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 |
| CY74FCT257TQCTG4 | 功能描述:編碼器、解碼器、復用器和解復用器 Quad 1-of-2 Data Sel Multipl 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 |
| CY74FCT257TQSOP | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
| CY74FCT257TSOIC | 制造商:TI 制造商全稱:Texas Instruments 功能描述:QUAD 2-INPUT MULTIPLEXER WITH 3-STATE OUTPUTS |
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