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參數(shù)資料
| 型號： | 74AHC257 |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Quad 2-input multiplexer; 3-state(四 通道2輸入多路復(fù)用器（三態(tài)）；) |
| 中文描述： | 四2輸入多路復(fù)用器，3態(tài)（四通道2輸入多路復(fù)用器（三態(tài)）;） |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 89K |
| 代理商： | 74AHC257 |
2000 Apr 03
2
Philips Semiconductors
Product specification
Quad 2-input multiplexer; 3-state
74AHC257;
74AHCT257
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A exceeds 2000 V
MM EIA/JESD22-A115-A exceeds 200 V
CDM EIA/JESD22-C101 exceeds 1000 V
Balanced propagation delays
All inputs have Schmitt-trigger actions
Non-inverting data path
Inputs accept voltages higher than V
CC
For AHC only: operates with CMOS input levels
For AHCT only: operates with TTL input levels
Specified from
40 to +85
°
C and
40 to +125
°
C.
DESCRIPTION
The 74AHC/AHCT257 are high-speed Si-gate CMOS
devices and are pin compatible with Low power Schottky
TTL (LSTTL). They are specified in compliance with
JEDEC standard No. 7A.
The 74AHC/AHCT257 has four identical 2-input
multiplexers with 3-state outputs, which select 4 bits of
data from two sources and are controlled by a common
data select input (S).
The data inputs from source 0 (1I
0
to 4I
0
) are selected
when input S is LOW and the data inputs from source 1
(1I
1
to 4I
1
) are selected when S is HIGH. Data appears at
the outputs (1Y to 4Y) in true (non-inverting) form from the
selected inputs.
The 74AHC/AHCT257 is the logic implementation of a
4-pole 2-position switch, where the position of the switch is
determined by the logic levels applied to S. The outputs
are forced to a high impedance OFF-state when OE is
HIGH.
If OE is LOW then the logic equations for the outputs are:
1Y = 1I
1
×
S + 1I
0
×
S;
2Y = 2I
1
×
S + 2I
0
×
S;
3Y = 3I
1
×
S + 3I
0
×
S;
4Y = 4I
1
×
S + 4I
0
×
S.
The ‘257’ is identical to the ‘258’ but has non-inverting
(true) outputs.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
≤
3.0 ns.
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W).
P
D
= C
PD
×
V
CC2
×
f
i
+
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in Volts.
The condition is V
I
= GND to V
CC
.
2.
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
AHC
AHCT
t
PHL
/t
PLH
propagation delay
nl
0
, nI
1
to nY
S to nY
input capacitance
output capacitance
power dissipation
capacitance
C
L
= 15 pF; V
CC
= 5 V
C
L
= 15 pF; V
CC
= 5 V
V
I
= V
CC
or GND
2.9
3.5
3.0
4.0
3.7
5.1
3.0
4.0
ns
ns
pF
pF
C
I
C
O
C
PD
C
L
= 50 pF; f
i
= 1 MHz; notes 1 and 2
4 outputs switching via input S
1 output switching via input I
45
15
51
15
pF
pF
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 74AHC257_08 | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Quad 2-input multiplexer 3-state |
| 74AHC257D | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 QUAD 2-INPUT MULTIPLEXER RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AHC257D,112 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 QUAD 2-INPUT RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AHC257D,118 | 功能描述:編碼器、解碼器、復(fù)用器和解復(fù)用器 QUAD 2-INPUT RoHS:否 制造商:Micrel 產(chǎn)品:Multiplexers 邏輯系列:CMOS 位數(shù): 線路數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-44 封裝:Tray |
| 74AHC257D-Q100J | 制造商:NXP Semiconductors 功能描述:74AHC257D-Q100/SO16/REEL13// 制造商:NXP Semiconductors 功能描述:74AHC257D-Q100/SO16/REEL13// - Tape and Reel 制造商:NXP Semiconductors 功能描述:IC MUX QUAD 2-INPUT 16SOIC |
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