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 high-
speed 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
Device summary
Temperature range
-40/+85 °C
-40/+85 °C
-40/+85 °C
-40/+85 °C
Table 1.
Order code
74LCX125TTR
74LCX125YTTR
(1)
74LCX125MTR
74LCX125YMTR
(1)
Package
TSSOP14
TSSOP14 (automotive grade)
SO-14
SO-14 (automotive grade)
Packaging
Tape and reel
Tape and reel
Tape and reel
Tape and reel
Marking
LCX125
LCX125Y
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
Contents
74LCX125
Contents
1
2
Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1
2.2
2.3
Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
5
6
7
8
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16
Doc ID 4980 Rev 8
74LCX125
Logic symbols and I/O equivalent circuit
1
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
74LCX125
2
2.1
Pin settings
Pin connections
Figure 3.
Pin connections (top through view)
2.2
Pin description
Table 2.
Pin description
Symbol
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
Pin number
1, 4, 10, 13
2, 5, 9, 12
3, 6, 8, 11
7
14
2.3
Truth table
Table 3.
Truth table
Inputs
A
a
X
(1)
L
H
1. “Do not care”.
2. High impedance.
Output
G
H
L
L
Y
a
Z
(2)
L
H
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Doc ID 4980 Rev 8
74LCX125
Maximum ratings
3
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
V
CC
V
I
V
O
V
O
I
IK
I
OK
I
O
I
CC
I
GND
T
stg
T
L
Supply voltage
DC input voltage
DC output voltage (V
CC
= 0 V)
DC output voltage (high or low state)
(1)
DC input diode current
DC output diode current
(2)
DC output current
DC supply current per supply pin
DC ground current per supply pin
Storage temperature
Lead temperature (10 sec.)
Absolute maximum ratings
Parameter
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
V
V
V
V
mA
mA
mA
mA
mA
°C
°C
1. I
O
absolute maximum rating must be observed.
2. V
O
< GND.
Recommended operating conditions
Table 5.
Symbol
V
CC
V
I
V
O
V
O
I
OH
, I
OL
I
OH
, I
OL
dt/dv
Supply voltage
(1)
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)
High or low level output current (V
CC
= 2.7 V)
Input rise and fall time
(2)
Recommended operating conditions
Parameter
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
V
V
V
mA
mA
ns/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.
Doc ID 4980 Rev 8
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