ST 74LVX126 User Manual
74LVX126
LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE)
WITH 5V TOLERANT INPUTS
■ HIGH SPEED:
t
=4.4ns (TY P.) 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
= 2 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
PHL
■ OPERATING VOLTAGE RANGE:
V
(OPR) = 2V to 3.6V (1.2V Data Retention)
CC
■ PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 126
■ IMPROVED LATCH-UP IMMUNITY
DESCRIPTION
The 74LVX126 is a low voltage CMOS QUAD
BUS BUFFERs 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.
TSSOPSOP
Table 1: Order Codes
PACKAGE T & R
SOP 74LVX126MTR
TSSOP 74LVX126TTR
This device requires the 3-STATE control input G
to be set low to plac e the output go i n to the hi gh
impedance state.
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 static disc harge, giving
them 2KV ESD immunity and transient excess
voltage.
Figure 1: Pin C onnection And IEC Logic Symbol s
Rev. 2
1/12August 2004
74LVX126
Figure 2: Input Equivalent Circuit Table 2: Pin Description
PIN N° SYMBOL NAME AND FUNCTION
1, 4, 10, 13 1G to 4G Output Enable Inputs
2, 5, 9, 12 1A to 4A Data Inputs
3, 6, 8, 11 1Y to 4Y Data Outputs
7 GND Ground (0V)
14
Table 3: Truth Table
AGY
XLZ
LHL
HHH
X :Don‘t Care
Z : High Impedance
Table 4: Absolute Maximum Ratings
Symbol Parameter Value Unit
V
V
V
I
I
OK
I
or I
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
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
Table 5: Recommended Operating Conditions
V
CC
Positive Supply Voltage
-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
V
Symbol Parameter Value Unit
V
V
V
T
dt/dv
1) Truth T abl e guarante ed: 1.2V to 3.6V
2) VIN from 0.8V to 2.0V
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)
2 to 3.6 V
0 to 5.5 V
CC
-55 to 125 °C
0 to 100 ns/V
2/12
V
Table 6: DC Specifications
Symbol Parameter
V
V
V
High Level Input
IH
Voltage
V
Low Level Input
IL
Voltage
High Level Output
OH
Voltage
Low Level Output
OL
Voltage
High Impedance
I
OZ
Output Leakage
Current
I
Input Leakage
I
Current
I
Quiescent Supply
CC
Current
74LVX126
Test Condition Value
= 25°C
T
V
CC
(V)
A
Min. Typ. Max. Min. Max. Min. Max.
2.0 1.5 1.5 1.5
222
3.6
2.4 2.4 2.4
2.0 0.5 0.5 0.5
3.6 0.8 0.8 0.8
=-50 µA
2.0
3.0
2.0
3.0
3.6
3.6
3.6
V
VO = VCC or GND
= 5.5V or GND
V
I
V
I
I
O
=-50 µA
I
O
=-4 mA
I
O
IO=50 µA
I
=50 µA
O
=4 mA
I
O
= VIH or V
I
= VCC or GND
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
IL
±0.25 ± 2.5 ± 5 µA
-40 to 85°C -55 to 125°C
0.36 0.44 0.55
± 0.1 ± 1 ± 1 µA
22020µA
Unit
V3.0
V3.0 0.8 0.8 0.8
V3.0
V3.0
Table 7: Dynamic Switching Characteristics
Test Condition Value
= 25°C
Symbol Parameter
V
V
Dynamic Low
OLP
Voltage Quiet
OLV
Output (note 1, 2)
V
CC
(V)
3.3
T
A
Min. Typ. Max. Min. Max. Min. Max.
0.3 0.5
-0.5 -0.3
Dynamic High
V
IHD
Voltage Input
3.3 2.0
= 50 pF
C
L
(note 1, 3)
Dynamic Low
V
ILD
Voltage Input
3.3 0.8
(note 1, 3)
1) Worst case package.
2) Max number of outp ut s defined as (n). Data inp ut s are driven 0V to 3.3V, (n-1) outputs switc hi ng and one out put at GND.
3) Max number of data inputs (n) switching. (n-1) switching 0V to 3.3V. Inputs under test switching: 3.3V to threshold (V
), f=1MHz.
(V
IHD
-40 to 85°C -55 to 125°C
ILD
Unit
V
), 0V to thresho l d
3/12
74LVX126
Table 8: AC Electrical Characteristics (Input tr = tf = 3ns)
Test Condition Value
= 25°C
Symbol Parameter
t
Propagation Delay
PLH
PHL
PZL
PZH
PLZ
PHZ
Time
Output Enable
Time
Output Disable
Time
Output to Output
Skew Time (note
1,2)
0.3V
t
t
t
t
t
t
OSLH
t
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 sa m e di rection, ei ther HIGH or LOW
2) Param eter guaran teed by design
(*) Voltage range is 3.3V ±
V
C
CC
(V)
L
(pF)
2.7 15 5.8 8.0 1.0 9.6 1.0 11.5
2.7 50 7.0 10.5 1.0 12.6 1.0 15.0
(*)
3.3
3.3
15 4.4 6.2 1.0 8.5 1.0 9.5
(*)
50 5.9 9.7 1.0 12.0 1.0 13.5
2.7 15 8.9 11.5 1.0 12.5 1.0 12.5
2.7 50 10.0 14.0 1.0 16.0 1.0 16.0
(*)
3.3
3.3
15 8.0 10.4 1.0 11.5 1.0 11.5
(*)
50 8.9 12 1.0 13.0 1.0 13.0
2.7 50 7.2 11.0 1.0 13.0 1.0 15.6
(*)
3.3
50 6.0 8.5 1.0 11.0 1.0 13.0
2.7 50 0.5 1.0 1.5 1.5
(*)
3.3
50 0.5 1.0 1.5 1.5
T
A
Min. Typ. Max. Min. Max. Min. Max.
Table 9: Capacitive Characteristics
-40 to 85°C -55 to 125°C
Unit
ns
ns
ns
ns
Test Condition Value
Symbol Parameter
C
C
C
Input Capacitance
IN
Output
OUT
Capacitance
Power Dissipation
PD
Capacitance
T
V
CC
(V)
A
Min. Typ. Max. Min. Max. Min. Max.
3.3 4 10 10 10 pF
3.3 6 pF
3.3 14 pF
-40 to 85°C -55 to 125°C
Unit
= 25°C
(note 1)
1) CPD is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
= CPD x VCC x fIN + ICC/4 (per c ircuit )
CC(opr)
4/12
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