74LCX257
LOW VOLTAGE CMOS QUAD 2 CHANNEL MULTIPLEXER
WITH 5V TOLERANT IN PU TS AN D OUTPUTS (3-STATE)
■ 5V TOLERANT INPUTS AND OUTPUTS
■ HIGH SPEED:
t
= 6.0 ns (MAX.) at VCC = 3V
PD
■ POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
■ SYMMETRICAL OUTPUT IMPEDANCE:
|I
| = IOL = 24mA (MIN) at VCC = 3V
OH
■ PCI BUS LEVELS GUARANTEED AT 24 mA
■ BALANCED PROPAGATION DELAYS:
t
≅ t
PLH
PHL
■ OPERATING VOLTAGE RANGE:
V
(OPR) = 2.0V to 3.6V (1.5V Data
CC
Retention)
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 257
■ LA TCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
■ ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
The 74LCX257 is a low v oltage 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 and high speed 3.3V applications; it can be
interfaced to 5V signal environment for both inputs
and ou tputs.
Figure 1: Pin C onnection And I EC Logic Symbol s
TSSOPSOP
Table 1: Order Codes
PACKAGE T & R
SOP 74LCX257MTR
TSSOP 74LCX257TTR
It is composed of four independent 2 channel
multiplexers with common SELECT and ENA BLE
(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" dat a is
selected, when SELECT INPUT is "High", "B" data
is chosen.
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 disc harge, giving
them 2KV ESD immunity and transient excess
voltage.
Rev. 4
1/13September 2004
74LCX257
Figure 2: Input An d Output Equival e n t Ci rcui t
Table 2: Pin Description
PIN N° SYMBOL NAME AND FUNCTION
1 SELECT Common Data Select Inputs
2, 5, 11, 14 1A to 4A Data Inputs From Source A
3, 6, 10, 13 1B to 4B Data Inputs From Source B
4, 7, 9, 12 1Y to 4Y 3 State Multiplexer Outputs
15 OE
8 GND Ground (0V)
16 V
CC
3 State Output Enable Inputs (Active LOW)
Positive Supply Voltage
Table 3: Truth Table
OE
HXXXZ
LLLXL
LLHXH
LHXLL
LHXHH
X : Don’t Care
Z : High Impedance
INPUTS OUTPUT
SELECT A B Y
2/13
Figure 3: Logic Diagram
74LCX257
This logi c di agram has not be used to estim ate propaga tion delays
Table 4: Absolute Maximum Ratings
Symbol Parameter Value Unit
V
V
V
V
I
I
OK
I
I
CC
I
GND
T
T
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
absolute maximum rating must be observed
1) I
O
2) V
< GND
O
Supply Voltage
CC
DC Input Voltage
I
DC Output Voltage (OFF State)
O
DC Output Voltage (High or Low State) (note 1) -0.5 to VCC + 0.5
O
DC Input Diode Current
IK
DC Output Diode Current (note 2)
DC Output Current
O
DC Supply Current per Supply Pin
DC Ground Current per Supply Pin
Storage Temperature
stg
Lead Temperature (10 sec)
L
-0.5 to +7.0 V
-0.5 to +7.0 V
-0.5 to +7.0 V
V
- 50 mA
- 50 mA
± 50 mA
± 100 mA
± 100 mA
-65 to +150 °C
300 °C
3/13
74LCX257
Table 5: Recommended Operating Conditions
Symbol Parameter Value Unit
V
V
V
V
I
OH
I
OH
T
dt/dv Input Rise and Fall Time (note 2) 0 to 10 ns/V
1) Truth T abl e guarante ed: 1.5V to 3.6V
2) V
from 0.8V to 2V at VCC = 3.0V
IN
Table 6: DC Specifications
Supply Voltage (note 1)
CC
Input Voltage
I
Output Voltage (OFF State)
O
Output Voltage (High or Low State) 0 to V
O
, I
High or Low Level Output Current (VCC = 3.0 to 3.6V)
OL
, I
High or Low Level Output Current (VCC = 2.7V)
OL
Operating Temperature
op
Test Condition Value
2.0 to 3.6 V
0 to 5.5 V
0 to 5.5 V
CC
± 24 mA
± 12 mA
-55 to 125 °C
V
Symbol Parameter
V
V
V
V
I
I
OZ
High Level Input
IH
Voltage
Low Level Input
IL
Voltage
High Level Output
OH
Voltage
Low Level Output
OL
Voltage
Input Leakage
I
I
Current
Power Off Leakage
off
Current
High Impedance
Output Leakage
Current
I
CC
∆I
Quiescent Supply
Current
ICC incr. per Input
CC
V
CC
(V)
2.7 to 3.6
2.7 to 3.6
2.7
3.0
2.7 to 3.6
2.7
3.0
2.7 to 3.6
0
2.7 to 3.6
2.7 to 3.6
2.7 to 3.6
-40 to 85 °C -55 to 125 °C
Min. Max. Min. Max.
2.0 2.0 V
=-100 µAVCC-0.2 VCC-0.2
I
O
=-12 mA
I
O
I
=-18 mA
O
I
=-24 mA
O
=100 µA
I
O
=12 mA
I
O
I
=16 mA
O
I
=24 mA
O
= 0 to 5.5V
V
I
or VO = 5.5V
V
I
= VIH or V
V
I
VO = 0 to V
IL
CC
2.2 2.2
2.4 2.4
2.2 2.2
0.55 0.55
VI = VCC or GND
V
or VO= 3.6 to 5.5V
I
VIH = VCC - 0.6V
± 10 ± 10
500 500 µA
Unit
0.8 0.8 V
0.2 0.2
0.4 0.4
0.4 0.4
± 5 ± 5 µA
10 10 µA
± 5 ± 5 µA
10 10
µA
V
V
4/13
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