SGS Thomson Microelectronics 74LVX257TTR, 74LVX257MTR, 74LVX257M Datasheet
74LVX257
LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER
(3-STATE) WITH 5V TOLERANT INPUTS
■ HIGH SPEED:
t
=5.8ns (TYP.) at VCC = 3.3V
PD
■ 5V TOLERANT INPUTS
■ POWER-DOWN PROTECTION ON INPUTS
■ INPUT VOLTAGE LEVEL:
V
= 0.8V, VIH = 2V at VCC =3V
IL
■ LOW POWER DISSIPATION:
I
= 4 µA (MAX.) at TA=25°C
CC
■ LOW NOISE:
V
= 0.3V (TYP.) at VCC =3.3V
OLP
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 4 mA (MIN) at VCC =3V
OH
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
■ OPERATING VOLTAGE R ANGE:
V
CC
■ PIN AND FUNCTION COMPATIBLE WITH
PHL
(OPR) = 2V to 3.6V (1.2V Data Retention)
74 SERIES 257
■ IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74LVX257 i s a low voltage CMOS QUAD 2
CHANNEL MULTIPLEXER (3-STATE) fabricated
with sub-micron silicon gate and double-layer
metal wiring C
2
MOS technology. It is ideal for low
power, battery operated and low noise 3.3V
applications.
It is composed of four independent 2-channel
multiplexers with commo n SELECT and ENABLE
(OE
) INPUT. The 74LVX257 is a non-inverting
TSSOPSOP
ORDER CODES
PACKAGE TUBE T & R
SOP 74LVX257M 74LVX257MTR
TSSOP 74LVX257TTR
multiplexer. When the ENABLE INPUT is held
"High", all outputs become in high impedance
state. If SELECT INPUT is held "L ow", "A" dat a is
selected, when SELECT INPUT is "High", "B"
data is chosen.
Power down protection is provided on all inputs
and 0 to 7V can be accepted on inputs with no
regard to the supply voltage.
This device can be used to interface 5V to 3V. It
combines high speed performance with the true
CMOS low power consumption.
All inputs and outputs are equipped with
protection circuits against stat ic discharge, giving
them 2KV ESD immunity and transient excess
voltage.
PIN CONNECTION AND IEC LOGIC SYMBOLS
1/10July 2001
74LVX257
INPUT EQUIVALENT CIRCUIT PIN DESCRIPTION
PIN No SYMBOL NAME AND FUNCTION
1 SELECT Common Data Select
2, 5, 11, 14 1A to 4A Data Inputs From Source
3, 6, 10, 13 1B to 4B Data Inputs From Source
4, 7, 9, 12 1Y to 4Y 3 State Multiplexer
15 OE
8 GND Ground (0V)
16 V
TRUTH TABLE
INPUTS OUTPUT
CC
Inputs
A
B
Outputs
3 State Output Enable
Inputs (Active LOW)
Positive Supply Voltage
OE
HXXXZ
LLLXL
LLHXH
LHXLL
LHXHH
X :Don‘t Care
Z : High Impedance
LOGIC DIAGRAM
SELECT A B Y
This log i c diagram has not be used to estimat e propagation del ays
2/10
74LVX257
ABSOLUTE MAXIMUM RATINGS
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
I
or I
CC
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
RECOMMENDED OPERATING CONDITIONS
Symbol Parameter Value Unit
V
V
V
T
dt/dv
1) Truth T abl e guaranteed: 1.2V to 3.6V
2) V
from 0.8V to 2.0V
IN
Supply Voltage
CC
DC Input Voltage
I
DC Output Voltage -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current
DC Output Current
O
DC VCC or Ground Current
GND
Storage Temperature
stg
Lead Temperature (10 sec)
L
Supply Voltage (note 1)
CC
Input Voltage
I
Output Voltage 0 to V
O
Operating Temperature
op
Input Rise and Fall Time (note 2) (V
CC
= 3V)
-0.5 to +7.0 V
-0.5 to +7.0 V
- 20 mA
± 20 mA
± 25 mA
± 50 mA
-65 to +150 °C
300 °C
2 to 3.6 V
0 to 5.5 V
CC
-55 to 125 °C
0 to 100 ns/V
V
V
DC SPECIFICATIONS
Symbol Parameter
V
V
V
V
I
I
High Level Input
IH
Voltage
Low Level Input
IL
Voltage
High Level Output
OH
Voltage
Low Level Output
OL
Voltage
High Impedance
OZ
Output Leakage
Current
I
Input Leakage
I
Current
Quiescent Supply
CC
Current
Test Condition Value
V
(V)
CC
= 25°C
A
Min. Typ. Max. Min. Max. Min. Max.
-40 to 85°C -55 to 125°C
T
2.0 1.5 1.5 1.5
2.0 2.0 2.0
3.6
2.4 2.4 2.4
2.0 0.5 0.5 0.5
3.6 0.8 0.8 0.8
2.0
3.0
2.0
3.0
3.6
3.6
3.6
IO=-50 µA
I
=-50 µA
O
I
=-4 mA
O
IO=50 µA
I
=50 µA
O
I
=4 mA
O
= VIH or V
V
I
IL
VO = VCC or GND
= 5.5V or GND
V
I
= VCC or GND
V
I
1.9 2.0 1.9 1.9
2.9 3.0 2.9 2.9
2.58 2.48 2.4
0.0 0.1 0.1 0.1
0.0 0.1 0.1 0.1
0.36 0.44 0.55
±0.25 ± 2.5 ± 5 µA
± 0.1 ± 1 ± 1 µA
44040µA
Unit
V3.0
V3.0 0.8 0.8 0.8
V3.0
V3.0
3/10
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