74LVC126A
LOW VOLTAGE CMOS QUAD BUS BUFFERS (3-STATE)
HIGH PERFORMANCE
■
■
■
■
■
■
■
■
■
■
5V TOLERANT INPUTS
HIGH SPEED: t
PD
= 4.8ns (MAX.) at V
CC
= 3V
POWER DOWN PROTECTION ON INPUTS
AND OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24mA (MIN) at V
CC
= 3V
PCI BUS LEVELS GUARANTEED AT 24 mA t
BALANCED PROPAGATION DELAYS:
PLH
≅ t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 1.65V to 3.6V (1.2V Data
Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 126
LATCH-UP PERFORMANCE EXCEEDS
500mA (JESD 17)
ESD PERFORMANCE:
HBM > 2000V (MIL STD 883 method 3015);
MM > 200V
DESCRIPTION
The 74LVC126A is a low voltage CMOS QUAD
BUS BUFFER fabricated with sub-micron silicon gate and double-layer metal wiring C
2
MOS technology. It is ideal for 1.65V to 3.6V V
CC operations and low power and low noise applications.
SOP
Table 1: Order Codes
PACKAGE
SOP
TSSOP
TSSOP
T & R
74LVC126AMTR
74LVC126ATTR
It can be interfaced to 5V signal environment for inputs in mixed 3.3/5V system.
The device requires the 3-STATE control input G to be set low to place the output go in to the high impedance state.
It has more 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 ESD immunity and transient excess voltage.
Figure 1: Pin Connection And IEC Logic Symbols
Obsolete Product(s) - Obsolete Product(s)
Obsolete Product(s) - Obsolete Product(s)
Rev. 2
1/12 July 2004
74LVC126A
Figure 2: Input And Output Equivalent Circuit
Table 2: Pin Description
PIN N°
1, 4, 10, 13
2, 5, 9, 12
3, 6, 8, 11
7
14
SYMBOL NAME AND FUNCTION
G1 to G4 Output Enable Inputs
A1 to A4 Data Inputs
Y1 to Y4 Data Outputs
GND Ground (0V)
V
CC
Positive Supply Voltage
Table 4: Absolute Maximum Ratings
Table 3: Truth Table
A
X
L
H
X : Don’t care
Z : High Impedance
G
L
H
H
Y
Z
L
H
Symbol Parameter Value Unit
V
CC
V
I
V
O
V
O
I
IK
Supply Voltage
DC Input Voltage
DC Output Voltage (High Impedance or V
CC
= 0V)
DC Output Voltage (High or Low State) (note 1)
DC Input Diode Current
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
- 50
V
V
V
V mA
I
OK
I
O
I
CC
or I
GND
T stg
DC Output Diode Current (note 2)
DC Output Current
DC V
CC
or Ground Current per Supply Pin
Storage Temperature
- 50
±
50
±
100
-65 to +150 mA mA mA
°C
T
L
Lead Temperature (10 sec) 300 °C Obsolete Product(s) - Obsolete Product(s)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is not implied
1) I
O
absolute maximum rating must be observed Obsolete Product(s) - Obsolete Product(s)
2/12
74LVC126A
Table 5: Recommended Operating Conditions
Symbol
V
CC
V
I
V
O
V
O
I
OH
, I
OL
I
OH
, I
OL
I
OH
, I
OL
I
OH
, I
OL
T op dt/dv
Parameter
Supply Voltage (note 1)
Input Voltage
Output Voltage (High Impedance or V
CC
= 0V)
Output Voltage (High or Low State)
High or Low Level Output Current (V
CC
= 3.0 to 3.6V)
High or Low Level Output Current (V
CC
= 2.7 to 3.0V)
High or Low Level Output Current (V
CC
= 2.3 to 2.7V)
High or Low Level Output Current (V
CC
= 1.65 to 2.3V)
Operating Temperature
Input Rise and Fall Time (note 2)
1) Truth Table guaranteed: 1.2V to 3.6V
2) V
I
from 0.8V to 2V at V
CC
= 3.0V
Table 6: DC Specifications
Value
1.65 to 3.6
0 to 5.5
0 to 5.5
0 to V
CC
±
24
±
12
±
8
±
4
-55 to 125
0 to 10
Test Condition Value
Symbol Parameter -40 to 85 °C -55 to 125 °C Unit
V
CC
(V)
Min.
Max.
Min.
Max.
V
IH
High Level Input
Voltage
1.65 to 1.95
2.3 to 2.7
2.7 to 3.6
0.65V
CC
1.7
2
0.65V
CC
1.7
2
V
V
IL
Low Level Input
Voltage
1.65 to 1.95
2.3 to 2.7
2.7 to 3.6
0.35V
CC
0.7
0.8
0.35V
CC
0.7
0.8
V
V
OH
High Level Output
Voltage
1.65 to 3.6
1.65
2.3
2.7
3.0
I
O
=-100
µ
A
I
O
=-4 mA
I
O
=-8 mA
I
O
=-12 mA
I
O
=-18 mA
V
CC
-0.2
1.2
1.7
2.2
2.4
V
CC
-0.2
1.2
1.7
2.2
2.4
V
V
OL
Low Level Output
Voltage
3.0
1.65 to 3.6
1.65
I
O
=-24 mA
I
O
=100
µ
A
I
O
=4 mA
2.2
0.2
0.45
2.2
0.2
0.45
2.3
I
O
=12 mA
I
O
=24 mA
0.7
0.4
0.7
0.4
V I
O
=8 mA
Obsolete Product(s) - Obsolete Product(s)
3.0
0.55
0.55
I
I
3.6
V
I
= 0 to 5.5V
±
5
±
5
µ
A
I off
I
OZ
I
CC
∆
I
CC
Power Off Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
I
CC
incr. per Input
0
3.6
3.6
2.7 to 3.6
V
I
or V
O
= 5.5V
V
I
= V
IH
or V
IL
V
O
= 0 to 5.5V
V
I
= V
CC
or GND
V
I
or V
O
= 3.6 to 5.5V
V
IH
= V
CC
-0.6V
10
±
5
10
±
10
500
10
±
5
10
±
10
500
µ
A
µ
A
µ
A
µ
A
Unit mA mA mA mA
°C ns/V
V
V
V
V
3/12
74LVC126A
Table 7: Dynamic Switching Characteristics
Symbol
V
OLP
V
OLV
Parameter
Dynamic Low Level Quiet
Output (note 1)
V
CC
(V)
3.3
Test Condition
C
L
= 50pF
V
IL
= 0V, V
IH
= 3.3V
Value
Min.
T
A
= 25 °C
Typ.
0.8
-0.8
Max.
Unit
V
1) Number of output 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
Symbol t
PLH
t
PHL t
PZL
t
PZH t
PLZ
t
PHZ t t
OSLH
OSHL
Parameter
V
CC
(V)
C
L
(pF)
Propagation Delay
Time
1.65 to 1.95
30
2.3 to 2.7
30
2.7
50
3.0 to 3.6
50
Output Enable Time 1.65 to 1.95
30
2.3 to 2.7
2.7
30
50
3.0 to 3.6
50
Output Disable Time 1.65 to 1.95
30
2.3 to 2.7
2.7
3.0 to 3.6
2.7 to 3.6
Output To Output
Skew Time (note1,
2)
30
50
50
R
L
(
Ω
) t s
= t
(ns)
1000 2.0
500 2.0
500 2.5
500 2.5
1000 2.0
500
500
2.0
2.5
500 2.5
1000 2.0
500
500
500
2.0
2.5
2.5
r
-40 to 85 °C
Min.
1.5
1
1
1
2
2
Max.
8.3
6.3
5.7
12.6
8.7
6.7
6
1
9.0
6.3
5.5
4.8
10
Value
-55 to 125 °C
Min.
Max.
10.8
7.6
6.8
16.4
11.3
8.0
7.2
1
12
8.5
6.5
5.8
13
Unit ns ns ns ns
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any two outputs of the same device switching in the same direction, either HIGH or LOW (t
OSLH
2) Parameter guaranteed by design
= | t
PLHm
- t
PLHn
|, t
OSHL
= | t
PHLm
- t
PHLn
|
Table 9: Capacitive Characteristics
Test Condition Value
Symbol Parameter T
A
= 25 °C Unit
V
CC
(V)
Min.
Typ.
Max.
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C
IN
Input Capacitance 4 pF f
IN
C
PD
Power Dissipation Capacitance 1.8
2.5
= 10MHz 28
30 pF
3.3
34
1) C
PD
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
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/4 (per circuit)
4/12
74LVC126A
Figure 3: Test Circuit
TEST t
PLH
, t
PHL t
PZL
, t
PLZ
(V
CC
= 3.0 to 3.6V) t
PZL
, t
PLZ
(V
CC
= 2.3 to 2.7V or V
CC
= 1.65 to 1.95V) t
PZH
, t
PHZ
C
L
= 30pF or equivalent (includes jig and probe capacitance)
R
L
= R
1
= 500
Ω
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
Ω
)
Table 10: Test Circuit And Waveform Symbol Value
SWITCH
Open
6V
2V
CC
GND
V
CC
Symbol
1.65 to 1.95V
2.3 to 2.7V
2.7V
3.0 to 3.6V
C
L
R
L
= R
1
V
S
V
IH
V
M
V
OH
30pF
1000
Ω
2 x V
CC
V
CC
V
CC
/2
V
CC
30pF
500
Ω
2 x V
CC
V
CC
V
CC
/2
V
CC
50pF
500
Ω
6V
2.7V
1.5V
3.0V
50pF
500
Ω
6V
2.7V
1.5V
3.0V
V
X
V
OL
+ 0.15V
Obsolete Product(s) - Obsolete Product(s)
<2.0ns
V
OL
+ 0.15V
<2.0ns
V
OL
+ 0.3V
<2.5ns
V
OL
+ 0.3V
V
OH
- 0.3V
<2.5ns
t r
= t r
Obsolete Product(s) - Obsolete Product(s)
5/12
74LVC126A
Figure 4: Waveform - Propagation Delays (f=1MHz; 50% duty cycle)
Figure 5: Waveform - Output Enable And Disable Time (f=1MHz; 50% duty cycle)
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DIM.
h
L e
H k ddd
D
E
B
C
A
A1
A2
74LVC126A
5.8
0.25
0.4
0°
0.33
0.19
8.55
3.8
MIN.
1.35
0.1
1.10
SO-14 MECHANICAL DATA
mm.
TYP MAX.
1.75
0.25
1.65
0.51
0.25
8.75
4.0
MIN.
0.053
0.004
0.043
0.013
0.007
0.337
0.150
1.27
6.2
0.50
1.27
8°
0.100
0.228
0.010
0.016
0° inch
TYP.
0.050
0.244
0.020
0.050
8°
0.004
MAX.
0.069
0.010
0.065
0.020
0.010
0.344
0.157
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0016019D
7/12
74LVC126A
DIM.
E1 e
D
E
K
L
A
A1
A2 b c
0.05
0.8
0.19
0.09
4.9
6.2
4.3
MIN.
0˚
0.45
TSSOP14 MECHANICAL DATA
mm.
TYP MIN.
1
5
6.4
4.4
0.65 BSC
MAX.
1.2
0.15
1.05
0.30
0.20
5.1
6.6
4.48
0.002
0.031
0.007
0.004
0.193
0.244
0.169
0.60
8˚
0.75
0˚
0.018
inch
TYP.
0.004
0.039
0.197
0.252
0.173
0.0256 BSC
0.024
MAX.
0.047
0.006
0.041
0.012
0.0089
0.201
0.260
0.176
8˚
0.030
A A2
A1 b e c
K
L
E
D
Obsolete Product(s) - Obsolete Product(s)
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E1
PIN 1 IDENTIFICATION
1
0080337D
8/12
DIM.
D
N
T
A
C
Ao
Bo
Ko
Po
P
74LVC126A
6.4
9
2.1
3.9
7.9
MIN.
12.8
20.2
60
Tape & Reel SO-14 MECHANICAL DATA
mm.
TYP MIN.
MAX.
330
13.2
inch
TYP.
0.504
0.795
2.362
22.4
6.6
9.2
2.3
4.1
8.1
0.252
0.354
0.082
0.153
0.311
MAX.
12.992
0.519
0.882
0.260
0.362
0.090
0.161
0.319
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9/12
74LVC126A
DIM.
D
N
T
A
C
Ao
Bo
Ko
Po
P
6.7
5.3
1.6
3.9
7.9
MIN.
12.8
20.2
60
Tape & Reel TSSOP14 MECHANICAL DATA
mm.
TYP MIN.
MAX.
330
13.2
inch
TYP.
0.504
0.795
2.362
22.4
6.9
5.5
1.8
4.1
8.1
0.264
0.209
0.063
0.153
0.311
MAX.
12.992
0.519
0.882
0.272
0.217
0.071
0.161
0.319
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Table 11: Revision History
Date
21-May-2004
26-Jul-2004
Revision
1
2
Description of Changes
First Release.
Ordering Codes Revision - pag. 1.
74LVC126A
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Obsolete Product(s) - Obsolete Product(s)
11/12
74LVC126A
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 Obsolete Product(s) - Obsolete Product(s) 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.
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All other names are the property of their respective owners
© 2004 STMicroelectronics - All Rights Reserved
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