74LCX257MTR [STMICROELECTRONICS]
LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE); 低压CMOS四路2通道，容许5V输入和输出复用器（ 3态）
| 型号： | 74LCX257MTR |
| 厂家： | 
ST |
| 描述： | LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE) |
| 文件： | 总13页 (文件大小：292K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
74LCX257
LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER
WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE)
■
■
5V TOLERANT INPUTS AND OUTPUTS
HIGH SPEED:
t
= 6.0 ns (MAX.) at V = 3V
PD
CC
■
■
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
SOP
TSSOP
|I | = I = 24mA (MIN) at V = 3V
OH
OL
CC
■
■
PCI BUS LEVELS GUARANTEED AT 24 mA
BALANCED PROPAGATION DELAYS:
Table 1: Order Codes
PACKAGE
t
t
PLH
PHL
T & R
■
OPERATING VOLTAGE RANGE:
(OPR) = 2.0V to 3.6V (1.5V Data
SOP
74LCX257MTR
74LCX257TTR
V
CC
Retention)
TSSOP
■
■
■
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
It is composed of four independent 2 channel
multiplexers with common SELECT and ENABLE
(OE) INPUT. The 74LCX257 is a non-inverting
multiplexer. When the ENABLE INPUT is held
"High", all outputs become in high impedance
state. If SELECT INPUT is held "Low", "A" data is
selected, when SELECT INPUT is "High", "B" data
is chosen.
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
It has same speed performance at 3.3V than 5V
AC/ACT family, combined with a lower power
consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
The 74LCX257 is a low voltage CMOS QUAD 2
CHANNEL MULTIPLEXER (3-STATE) fabricated
with sub-micron silicon gate and double-layer
2
metal wiring C MOS technology. It is ideal for low
power and high speed 3.3V applications; it can be
interfaced to 5V signal environment for both inputs
and outputs.
Figure 1: Pin Connection And IEC Logic Symbols
Rev. 4
1/13
September 2004
74LCX257
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
PIN N°
SYMBOL
NAME AND FUNCTION
Common Data Select Inputs
1
2, 5, 11, 14
3, 6, 10, 13
4, 7, 9, 12
15
SELECT
1A to 4A
1B to 4B
1Y to 4Y
OE
Data Inputs From Source A
Data Inputs From Source B
3 State Multiplexer Outputs
3 State Output Enable Inputs (Active LOW)
Ground (0V)
8
GND
16
V
Positive Supply Voltage
CC
Table 3: Truth Table
INPUTS
OUTPUT
OE
SELECT
A
B
Y
H
L
L
L
L
X
L
X
L
X
X
X
L
Z
L
L
H
X
X
H
L
H
H
H
H
X : Don’t Care
Z : High Impedance
2/13
74LCX257
Figure 3: Logic Diagram
This logic diagram has not be used to estimate propagation delays
Table 4: Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
V
Supply Voltage
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
V
V
CC
V
DC Input Voltage
I
V
DC Output Voltage (OFF State)
DC Output Voltage (High or Low State) (note 1)
DC Input Diode Current
V
O
V
-0.5 to V + 0.5
V
O
CC
I
- 50
- 50
mA
mA
mA
mA
mA
°C
°C
IK
I
DC Output Diode Current (note 2)
DC Output Current
OK
I
± 50
O
I
DC Supply Current per Supply Pin
DC Ground Current per Supply Pin
Storage Temperature
± 100
± 100
-65 to +150
300
CC
I
GND
T
stg
T
Lead Temperature (10 sec)
L
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
1) I absolute maximum rating must be observed
O
2) V < GND
O
3/13
74LCX257
Table 5: Recommended Operating Conditions
Symbol
Parameter
Value
Unit
V
Supply Voltage (note 1)
Input Voltage
2.0 to 3.6
0 to 5.5
0 to 5.5
V
V
CC
V
I
V
Output Voltage (OFF State)
V
O
V
Output Voltage (High or Low State)
0 to V
V
O
CC
I
I
, I
High or Low Level Output Current (V = 3.0 to 3.6V)
± 24
± 12
mA
mA
°C
ns/V
OH OL
CC
, I
High or Low Level Output Current (V = 2.7V)
OH OL
CC
T
Operating Temperature
-55 to 125
0 to 10
op
dt/dv
Input Rise and Fall Time (note 2)
1) Truth Table guaranteed: 1.5V to 3.6V
2) V from 0.8V to 2V at V = 3.0V
IN
CC
Table 6: DC Specifications
Test Condition
Value
Symbol
Parameter
-40 to 85 °C
Min. Max.
-55 to 125 °C
Unit
V
(V)
CC
Min.
Max.
V
High Level Input
Voltage
IH
2.0
2.0
V
V
2.7 to 3.6
V
Low Level Input
Voltage
IL
0.8
0.8
V
High Level Output
Voltage
I =-100 µA
V
-0.2
V
-0.2
2.7 to 3.6
2.7
OH
O
CC
CC
I =-12 mA
2.2
2.4
2.2
2.2
O
V
V
I =-18 mA
2.4
2.2
O
3.0
I =-24 mA
O
V
Low Level Output
Voltage
I =100 µA
2.7 to 3.6
2.7
0.2
0.4
0.2
0.4
OL
O
I =12 mA
O
I =16 mA
0.4
0.4
O
3.0
I =24 mA
0.55
0.55
O
I
Input Leakage
Current
I
V = 0 to 5.5V
2.7 to 3.6
0
± 5
± 5
µA
µA
I
I
Power Off Leakage
Current
off
V or V = 5.5V
10
10
I
O
I
High Impedance
Output Leakage
Current
OZ
V = V or V
I
IH
IL
2.7 to 3.6
± 5
± 5
µA
V
= 0 to V
O
CC
I
Quiescent Supply
Current
V = V or GND
I CC
10
10
CC
2.7 to 3.6
2.7 to 3.6
µA
µA
V or V = 3.6 to 5.5V
± 10
500
± 10
500
I
O
∆I
I
incr. per Input
V
= V - 0.6V
CC
CC
IH
CC
4/13
74LCX257
Table 7: Dynamic Switching Characteristics
Test Condition
Value
T = 25 °C
Symbol
Parameter
Unit
A
V
CC
(V)
Min.
Typ.
Max.
V
Dynamic Low Level Quiet
Output (note 1)
0.8
C = 50pF
OLP
L
3.3
V
V
= 0V, V = 3.3V
V
-0.8
IL
IH
OLV
1) Number of outputs defined as "n". Measured with "n-1" outputs switching from HIGH to LOW or LOW to HIGH. The remaining output is
measured in the LOW state.
Table 8: AC Electrical Characteristics
Test Condition
Value
-55 to 125 °C
Symbol
Parameter
-40 to 85 °C
Unit
V
C
R
t = t
CC
L
L
s
r
(V)
(pF)
(Ω)
500
500
500
(ns)
2.5
2.5
2.5
Min.
Max.
Min.
Max.
t
t
t
Propagation Delay
Time (A, B to Y)
2.7
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
6.5
6.0
8.5
7.0
8.5
7.0
6.0
5.5
1.0
1.5
1.5
1.5
1.5
1.5
1.5
1.5
1.5
6.5
6.0
8.5
7.0
8.5
7.0
6.0
5.5
1.0
PLH PHL
50
ns
ns
ns
3.0 to 3.6
2.7
t
Propagation Delay
Time (SELECT to Y)
PLH PHL
50
3.0 to 3.6
2.7
t
t
t
Output Enable Time
PZL PZH
50
3.0 to 3.6
2.7
t
Output Disable Time
PLZ PHZ
50
50
500
500
2.5
2.5
ns
ns
3.0 to 3.6
3.0 to 3.6
t
t
Output To Output
Skew Time (note1,
2)
OSLH
OSHL
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switch-
ing in the same direction, either HIGH or LOW (t
2) Parameter guaranteed by design
= | t
- t
|, t
= | t
- t
|)
OSLH
PLHm PLHn OSHL
PHLm PHLn
Table 9: Capacitive Characteristics
Test Condition
Value
T = 25 °C
Symbol
Parameter
Unit
A
V
CC
(V)
Min.
Typ.
Max.
C
Input Capacitance
V
V
= 0 to V
3.3
3.3
3.3
7
8
pF
pF
IN
IN
CC
CC
C
Output Capacitance
= 0 to V
OUT
IN
C
Power Dissipation Capacitance
(note 1)
f
= 10MHz
25
PD
IN
pF
V
= 0 or V
CC
IN
1) C is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
PD
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
channel)
= C x V x f + I /4 (per
CC(opr)
PD CC IN CC
5/13
74LCX257
Figure 4: Test Circuit
TEST
SWITCH
t
t
t
, t
Open
6V
PLH PHL
, t
PZL PLZ
, t
GND
PZH PHZ
C
R
R
= 50 pF or equivalent (includes jig and probe capacitance)
= R1 = 500Ω or equivalent
L
L
T
= Z
of pulse generator (typically 50Ω)
OUT
Figure 5: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
6/13
74LCX257
Figure 6: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
7/13
74LCX257
SO-16 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.75
0.25
1.64
0.46
0.25
MIN.
MAX.
0.068
0.010
0.063
0.018
0.010
A
a1
a2
b
0.1
0.004
0.35
0.19
0.013
0.007
b1
C
0.5
0.019
c1
D
45° (typ.)
9.8
5.8
10
0.385
0.228
0.393
0.244
E
6.2
e
1.27
8.89
0.050
0.350
e3
F
3.8
4.6
0.5
4.0
5.3
0.149
0.181
0.019
0.157
0.208
0.050
0.024
G
L
1.27
0.62
M
S
8° (max.)
0016020D
8/13
74LCX257
TSSOP16 MECHANICAL DATA
mm.
inch
TYP.
DIM.
MIN.
TYP
MAX.
1.2
MIN.
MAX.
0.047
0.006
0.041
0.012
0.0079
0.201
0.260
0.176
A
A1
A2
b
0.05
0.8
0.15
1.05
0.30
0.20
5.1
0.002
0.031
0.007
0.004
0.193
0.244
0.169
0.004
0.039
1
0.19
0.09
4.9
c
D
5
6.4
0.197
0.252
E
6.2
6.6
E1
e
4.3
4.4
4.48
0.173
0.65 BSC
0.0256 BSC
K
0˚
8˚
0˚
8˚
L
0.45
0.60
0.75
0.018
0.024
0.030
A2
A
K
L
b
e
A1
c
E
D
E1
PIN 1 IDENTIFICATION
1
0080338D
9/13
74LCX257
Tape & Reel SO-16 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
22.4
6.65
10.5
2.3
0.882
0.262
0.414
0.090
0.161
0.319
Ao
Bo
Ko
Po
P
6.45
10.3
2.1
0.254
0.406
0.082
0.153
0.311
3.9
4.1
7.9
8.1
10/13
74LCX257
Tape & Reel TSSOP16 MECHANICAL DATA
mm.
TYP
inch
TYP.
DIM.
MIN.
MAX.
330
MIN.
MAX.
12.992
0.519
A
C
12.8
20.2
60
13.2
0.504
0.795
2.362
D
N
T
22.4
6.9
5.5
1.8
4.1
8.1
0.882
0.272
0.217
0.071
0.161
0.319
Ao
Bo
Ko
Po
P
6.7
5.3
1.6
3.9
7.9
0.264
0.209
0.063
0.153
0.311
11/13
74LCX257
Table 10: Revision History
Date
Revision
Description of Changes
Ordering Codes Revision - pag. 1.
15-Sep-2004
4
12/13
74LCX257
Information furnished is believed to be accurate and reliable. However, STMicroelectronics assumes no responsibility for the consequences
of use of such information nor for any infringement of patents or other rights of third parties which may result from its use. No license is granted
by implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject
to change without notice. This publication supersedes and replaces all information previously supplied. STMicroelectronics products are not
authorized for use as critical components in life support devices or systems without express written approval of STMicroelectronics.
The ST logo is a registered trademark of STMicroelectronics
All other names are the property of their respective owners
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13/13
相关型号：
74LCX257MX_NL
Multiplexer, LVC/LCX/Z Series, 4-Func, 2 Line Input, 1 Line Output, True Output, CMOS, PDSO16, 0.150 INCH, MS-012, SOIC-16
FAIRCHILD
74LCX257TTR
LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER WITH 5V TOLERANT INPUTS AND OUTPUTS (3-STATE)
STMICROELECTR
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