74LCX125
Low-voltage CMOS quad bus buffer (3-state)
with 5 V tolerant inputs and outputs
Datasheet
−
production data
Features
■
■
■
■
■
■
■
■
■
■
5 V tolerant inputs and outputs
High speed
– t
PD
= 5.2 ns (max.) at V
CC
= 3 V
Power-down protection on inputs and outputs
Symmetrical output impedance
– |I
OH
| = I
OL
= 24 mA (min.) at V
CC
= 3 V
PCI bus levels guaranteed at 24 mA
Balanced propagation delay
– t
PLH
≅ t
PHL
Operating voltage range
– V
CC
(opr.) = 2.0 V to 3.6 V
Pin and function compatible with 74 series 125
Latch-up performance exceeds 500 mA
(JESD 17)
ESD performance
– HBM: 2000 V (MIL STD 883 method 3015)
– MM: 200 V
– CDM: 1000 V
TSSOP14 SO-14
Description
The 74LCX125 device is a low-voltage CMOS quad bus buffer manufactured with sub-micron silicon gate and double-layer metal wiring C
2
MOS technology. It is ideal for low-power and highspeed 3.3 V applications and can be interfaced to a 5 V signal environment for both inputs and outputs.
The device requires the 3-state control input G to be set high to place the output in the high impedance state.
It has the same speed performance at 3.3 V as the 5 V AC/ACT family, combined with lower power consumption.
All inputs and outputs are equipped with protection circuits against static discharge, giving them 2 kV ESD immunity and transient excess voltage.
Applications
■
■
■
■
Automotive
Industrial
Computer
Consumer
Table 1.
Device summary
Order code Temperature range Package Packaging Marking
74LCX125TTR
74LCX125YTTR
(1)
-40/+85 °C
-40/+85 °C
TSSOP14 Tape and reel
TSSOP14 (automotive grade) Tape and reel
LCX125
LCX125Y
74LCX125MTR
74LCX125YMTR
(1)
-40/+85 °C
-40/+85 °C
SO-14
SO-14 (automotive grade)
Tape and reel
Tape and reel
74LCX125
74LCX125Y
1.
Qualification and characterization according to AEC Q100 and Q003 or equivalent, advanced screening according to AEC
Q001 and Q002 or equivalent.
October 2012
This is information on a product in full production.
Doc ID 4980 Rev 8 1/16 www.st.com
16
6
7
4
5
8
1
2
Contents
Contents
3
74LCX125
Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3
Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 Doc ID 4980 Rev 8
74LCX125
1
Logic symbols and I/O equivalent circuit
Logic symbols and I/O equivalent circuit
Figure 1.
IEC logic symbols
Figure 2.
Input and output equivalent circuit
Doc ID 4980 Rev 8 3/16
Pin settings
Figure 3.
Pin connections (top through view)
74LCX125
4/16
Table 2.
Pin description
Pin number Symbol
1, 4, 10, 13
2, 5, 9, 12
3, 6, 8, 11
7
14
1G TO 4G
1A TO 4A
1Y TO 4Y
GND
V
CC
Name and function
Output enable input
Data inputs
Data outputs
Ground (0 V)
Positive supply voltage
Table 3.
Truth table
Inputs
A a X
(1)
L
H
1.
“Do not care”.
2.
High impedance.
G
H
L
L
Doc ID 4980 Rev 8
Output
Y a Z
(2)
L
H
74LCX125 Maximum ratings
Stressing the device above the rating listed in
Table 4: Absolute maximum ratings
may cause permanent damage to the device. These are stress ratings only and operation of the
device at these or any other conditions above those indicated in Table 5: Recommended operating conditions
of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Table 4.
Symbol
Absolute maximum ratings
Parameter
V
CC
V
I
V
O
V
O
I
IK
I
OK
Supply voltage
DC input voltage
DC output voltage (V
CC
DC output voltage (high or low state)
DC input diode current
DC output diode current
= 0 V)
(2)
I
O
I
CC
I
GND
T stg
T
L
DC output current
DC supply current per supply pin
DC ground current per supply pin
Storage temperature
Lead temperature (10 sec.)
1.
I
O
absolute maximum rating must be observed.
2.
V
O
< GND.
(1)
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
-50
-50
±
50
±
100
±
100
-65 to +150
300
Unit mA mA mA mA
°C
°C
V
V
V
V mA
Recommended operating conditions
Table 5.
Recommended operating conditions
Symbol Parameter
V
CC
Supply voltage
(1)
I
OH
V
I
V
O
V
O
, I
OL
Input voltage
Output voltage (V
CC
= 0 V)
Output voltage (high or low state)
High or low level output current (V
CC
= 3.0 to 3.6 V)
I
OH
, I
OL
High or low level output current (V dt/dv Input rise and fall time
(2)
CC
= 2.7 V)
1.
Truth table guaranteed: 1.5 V to 3.6 V.
2.
V
IN
from 0.8 V to 2 V at V
CC
= 3.0 V.
Value
2.0 to 3.6
0 to 5.5
0 to 5.5
0 to V
CC
±
24
±
12
0 to 10
Unit
V mA mA ns/V
V
V
V
Doc ID 4980 Rev 8 5/16
Electrical characteristics 74LCX125
Table 6.
DC specifications
Test condition Value
Symbol
Δ
I
V
I
V
V
V
I
I
I
IH
IL
OH
OL
I off
OZ
CC
CC
Parameter
V
CC
(V)
-40 to 85 °C
Min.
High level input voltage
2.7 to 3.6
Low level input voltage
High level output voltage
Low level output voltage
2.7 to 3.6
2.7
3.0
2.7 to 3.6
2.7
3.0
I
O
= -100
μ
A
I
O
= -12 mA
I
O
= -18 mA
I
O
= -24 mA
I
O
= 100
μ
A
I
O
= 12 mA
I
O
= 16 mA
I
O
= 24 mA
V
I
= 0 to 5.5 V Input leakage current 2.7 to 3.6
Power OFF leakage current
0
High Impedance output leakage current
Quiescent supply current
I incr. per input
V
I
or V
O
= 5.5 V
2.7 to 3.6
2.7 to 3.6
2.7 to 3.6
V
I
= V
IH
or V
IL
V
O
= 0 to V
CC
V
I
= V
CC
or GND
V
I
or V
O
= 3.6 to 5.5 V
V
IH
= V
CC
- 0.6 V
2.0
V
CC
- 0.2
2.2
2.4
2.2
Max.
±
0.8
10
±
5
10
10
500
0.2
0.4
0.4
0.55
±
5
Unit
V
V
V
V
μ
A
μ
A
μ
A
μ
A
μ
A
Table 7.
Dynamic switching characteristics
Test condition Value
Symbol Parameter
V
CC
(V)
T
A
= 25 °C
Min.
Typ.
Max.
Unit
V
OLP
V
OLV
Dynamic low level quiet output
(1)
3.3
C
V
L
IL
= 50 pF
= 0 V, V
IH
= 3.3 V
0.8
-0.8
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.
V
6/16 Doc ID 4980 Rev 8
74LCX125 Electrical characteristics
Table 8.
AC electrical characteristics
Test condition Value
Symbol Parameter
V
CC
(V)
C
L
(pF)
R
L
(
Ω
) t s
= t r
(ns)
-40 to 85 °C Unit
Min.
Max.
t
PLH
, t
PHL
Propagation delay time
2.7
3.0 to 3.6
2.7
t
PZL
, t
PZH
Output enable time to HIGH and
LOW level t
PLZ
, t
PHZ
Output disable time to HIGH and
LOW level
3.0 to 3.6
2.7
3.0 to 3.6
50
50
50
500
500
500
2.5
2.5
2.5
1.0
1.0
1.0
1.0
1.0
6.0
5.2
6.0
5.0
6.0
5.0
ns ns ns t
OSLH t
OSHL
Output to output skew time
(1) (2)
3.0 to 3.6
50 500 2.5
1.0
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
= | t
PLHm
- t
PLHn
|, t
OSHL
= | t
PHLm
- t
PHLn
|).
2.
Parameter guaranteed by design.
Table 9.
Capacitive characteristics
Test condition Value
Symbol Parameter
V
CC
(V)
T
A
= 25 °C
Min.
Typ.
Max.
Unit
C
C
C
IN
OUT
PD
Input capacitance
Output capacitance
Power dissipation capacitance
(1)
3.3
3.3
3.3
V
IN
= 0 to V
CC
V
IN
= 0 to V
CC f
IN
= 10 MHz
V
IN
= 0 or V
CC
5
10
37 pF pF pF
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
Table 10: 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 gate).
Doc ID 4980 Rev 8 7/16
Test circuit
Figure 4.
Test circuit
Note:
Table 10.
Test circuit
Test t
PLH
, t
PHL t
PZL
, t
PLZ t
PZH
, t
PHZ
C
L
= 50 pF or equivalent (includes jig and probe capacitance)
R
L
= 500
Ω
or equivalent
R
T
= Z
OUT
of pulse generator (typically 50
Ω
).
Switch
Open
6 V
GND
74LCX125
8/16 Doc ID 4980 Rev 8
74LCX125
6 Waveforms
Figure 5.
Propagation delay (f = 1 MHz; 50% duty cycle)
Waveforms
Figure 6.
Output enable and disable time (f = 1 MHz; 50% duty cycle)
Doc ID 4980 Rev 8 9/16
Package information 74LCX125
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK specifications, grade definitions and product status are available at: www.st.com
. ECOPACK is an ST trademark.
10/16 Doc ID 4980 Rev 8
74LCX125
Figure 7.
SO-14 package outline
Package information
Table 11.
SO-14 package mechanical data
Dimensions
Symbol mm inch
Min. Typ.
Max. Min. Typ. Max.
A 1.35
A1 0.1
A2 1.10
B 0.33
C 0.19
D 8.55
E 3.8
0.25 0.004 e 1.27
H 5.8 h 0.25
L 0.4
0.050
0.244
0.020
0.050
k 0° 8° 0° 8° ddd 0.100 0.004
0.069
0.010
0.065
0.020
0.010
0.344
0.157
Doc ID 4980 Rev 8 11/16
Package information
Figure 8.
TSSOP14 package outline
74LCX125
12/16
.
Table 12.
TSSOP14 package mechanical data
Dimensions
Symbol mm inch
Min. Typ.
Max. Min. Typ. Max.
A1 0.05 b 0.19 c 0.09 0.20
0.004
0.012
0.0089
K 0° 8° 0° 8°
Doc ID 4980 Rev 8
74LCX125
Figure 9.
Tape and reel SO-14 outline
Package information
Drawing is not in scale.
Table 13.
Tape and reel SO-14 mechanical data
Dimensions
Symbol mm inch
Min. Typ.
Max. Min. Typ. Max.
A
C
330 12.992
12.8 13.2 0.519
D 20.2
N 60
0.795
2.362
T 22.4 0.882
0.260
Ao 6.4
Bo
Ko 2.1
Po 3.9
P 7.9
0.090
0.161
0.319
Doc ID 4980 Rev 8 13/16
Package information
Figure 10.
Tape and reel TSSOP14 outline
74LCX125
14/16
Drawing is not in scale.
.
Table 14.
Tape and reel TSSOP14 mechanical data
Dimensions
Symbol mm inch
Min. Typ.
Max. Min. Typ. Max.
0.519
C 12.8
D 20.2 0.795
N 60 2.362
Ao 6.7
Bo 5.3
Ko 1.6
Po 3.9
P 7.9
0.272
0.217
0.071
0.161
0.319
Doc ID 4980 Rev 8
74LCX125 Revision history
Table 15.
Document revision history
Date Revision
15-Sep-2004
13-Jul-2006
20-Jun-2012
02-Oct-2012
5
6
7
8
Changes
Ordering codes revision - pag. 1
New template, temperature ranges updated
Added Applications on page 1
Updated
Table 1: Device summary on page 1
Updated T op
in
Table 5: Recommended operating conditions
Updated ECOPACK
®
text in
Section 7: Package information
Minor textual updates
Updated ESD performance in
Features (updated HBM and MM,
added CDM).
Added 74LCX125YMTR device and “Marking” to
Table 1 , updated
temperature range and note
1 .
Updated
Section 3: Maximum ratings (added cross-references).
Removed “Operating temperature” from Table 5 .
Reformatted
Section 7: Package information .
Minor corrections throughout document.
Doc ID 4980 Rev 8 15/16
74LCX125
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