Page 1
Low-voltage CMOS quad bus buffer (3-state)
Features
■ 5 V tolerant inputs and outputs
■ High speed
–t
= 5.2 ns (max) at V
PD
■ Power-down protection on inputs and outputs
■ Symmetrical output impedance
–|I
■ PCI bus levels guaranteed at 24 mA
■ Balanced propagation delay
–t
■
Operating voltage range
–V
■ Pin and function compatible with 74 series 125
■ Latch-up performance exceeds 500 mA
| = IOL = 24 mA (min) at VCC = 3 V
OH
≅ t
PLH
PHL
(opr) = 2.0 V to 3.6 V
CC
(JESD 17)
■ ESD performance
– HBM > 2000V
(MIL STD 883 method 3015); MM > 200V
Applications
CC
= 3 V
74LCX125
with 5 V tolerant inputs and outputs
Datasheet − production data
TSSOP14 SO-14
Description
The 74LCX125 is a low-voltage CMOS quad bus
buffer manufactured with sub-micron silicon gate
and double-layer metal wiring C
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
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.
2
MOS technology.
to
■ Automotive
■ Industrial
■ Computer
■ Consumer
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2 kV ESD immunity and transient excess
voltage.
Table 1. Device summary
Part number Temperature range Package Packaging
74LCX125TTR -40/+85 °C TSSOP14 Tape and reel
74LCX125YTTR
74LCX125MTR -40/+85 °C SO-14 Tape and reel
1. Qualification and characterization (according to AEC Q100 and Q003 or equivalent) and advanced screening (according to
AEC Q001 and Q002 or equivalent) are ongoing.
June 2012 Doc ID 4980 Rev 7 1/16
This is information on a product in full production.
(1)
-40/+125 °C TSSOP14 (automotive grade) Tape and reel
www.st.com
16
Page 2
Contents 74LCX125
Contents
1 Logic symbols and I/O equivalent circuit . . . . . . . . . . . . . . . . . . . . . . . . 3
2 Pin settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.1 Pin connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.2 Pin description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
2.3 Truth table . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3 Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
3.1 Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4 Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5 Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6 Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7 Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8 Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16 Doc ID 4980 Rev 7
Page 3
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 7 3/16
Page 4
Pin settings 74LCX125
2 Pin settings
2.1 Pin connections
Figure 3. Pin connections (top through view)
2.2 Pin description
Table 2. Pin description
Pin number Symbol Name and function
1, 4, 10, 13 1G
2, 5, 9, 12 1A TO 4A Data inputs
3, 6, 8, 11 1Y TO 4Y Data outputs
7 GND Ground (0 V)
14 V
2.3 Truth table
Table 3. Truth table
a sX
1. Do not care
2. High impedance
TO 4G Output enable input
CC
Inputs Output
AG
(1)
LLL
HLH
Positive supply voltage
Y
H a sZ
(2)
4/16 Doc ID 4980 Rev 7
Page 5
74LCX125 Maximum ratings
3 Maximum ratings
Stressing the device above the rating listed in the “absolute maximum ratings” table 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 the operating sections of
this specification is not implied. Exposure to absolute maximum rating conditions for
extended periods may affect device reliability.
Table 4. Absolute maximum ratings
Symbol Parameter Value Unit
V
I
I
I
GND
T
1. IO absolute maximum rating must be observed
2. VO < GND
Supply voltage -0.5 to +7.0 V
CC
DC input voltage -0.5 to +7.0 V
V
I
V
DC output voltage (VCC = 0 V) -0.5 to +7.0 V
O
DC output voltage (high or low state)
V
O
I
DC input diode current -50 mA
IK
DC output diode current
OK
DC output current ± 50 mA
I
O
DC supply current per supply pin ± 100 mA
CC
(2)
(1)
DC ground current per supply pin ± 100 mA
Storage temperature -65 to +150 °C
stg
T
Lead temperature (10 sec) 300 °C
L
3.1 Recommended operating conditions
Table 5. Recommended operating conditions
Symbol Parameter Value Unit
(1)
TSSOP14, SO-14 -40 to 85 °C
TSSOP14 (automotive grade) -40 to 125 °C
(2)
I
I
V
V
V
V
OH
OH
T
Supply voltage
CC
Input voltage 0 to 5.5 V
I
Output voltage (VCC = 0 V) 0 to 5.5 V
O
Output voltage (high or low state) 0 to V
O
, IOLHigh or low level output current (VCC = 3.0 to 3.6 V) ± 24 mA
, IOLHigh or low level output current (VCC = 2.7 V) ± 12 mA
Operating temperature
op
dt/dv Input rise and fall time
1. Truth table guaranteed: 1.5 V to 3.6 V
2. VIN from 0.8 V to 2 V at VCC = 3.0 V
-0.5 to VCC + 0.5 V
-50 mA
2.0 to 3.6 V
CC
V
0 to 10 ns/V
Doc ID 4980 Rev 7 5/16
Page 6
Electrical characteristics 74LCX125
4 Electrical characteristics
Table 6. DC specifications
Test condition Value
Symbol Parameter
V
V
V
V
I
I
OZ
I
CC
ΔI
High level input voltage
IH
Low level input voltage 0.8 V
IL
High level output
OH
voltage
Low level output
OL
voltage
Input leakage current 2.7 to 3.6 VI = 0 to 5.5 V ± 5 μA
I
I
Power OFF leakage
off
current
High Impedance
output leakage current
Quiescent supply
current
I incr. per input 2.7 to 3.6 VIH = VCC - 0.6V 500 μA
CC
V
CC
(V)
-40 to 85 °C
Min Max
Unit
2.0 V
2.7 to 3.6
2.7 to 3.6 I
2.7 I
3.0
= -100 μAVCC-0.2
O
= -12 mA 2.2
O
I
= -18 mA 2.4
O
I
= -24 mA 2.2
O
V
2.7 to 3.6 IO = 100 μA0.2
2.7 I
3.0
0V
2.7 to 3.6
2.7 to 3.6
= 12 mA 0.4
O
I
= 16 mA 0.4
O
= 24 mA 0.55
I
O
or VO = 5.5 V 10 μA
I
= VIH or V
V
I
VO = 0 to V
V
= VCC or GND 10
I
or VO= 3.6 to 5.5V ± 10
V
I
CC
IL
± 5 μA
V
μA
Table 7. Dynamic switching characteristics
Test condition Value
Symbol Parameter
V
OLP
V
OLV
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.
Dynamic low level quiet
(1)
output
6/16 Doc ID 4980 Rev 7
V
(V)
3.3
CC
C
VIL = 0 V, VIH = 3.3 V
= 50 pF
L
TA = 25 °C
Min Typ Max
0.8
-0.8
Unit
V
Page 7
74LCX125 Electrical characteristics
Table 8. AC electrical characteristics
Test condition Value
Symbol Parameter
t
PLH
Propagation delay
, t
PHL
time
Output enable
t
PZL
, t
time to HIGH and
PZH
LOW level
Output disable
t
PLZ
, t
time to HIGH and
PHZ
LOW level
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 switching in the same direction, either HIGH or LOW (t
t
OSHL
2. Parameter guaranteed by design
Output to output
skew time
= | t
PHLm
- t
PHLn
(1) (2)
|)
V
CC
(V)
C
(pF)
L
R
(Ω)
ts = t
L
(ns)
2.7
50 500 2.5
3.0 to 3.6 1.0 5.2
2.7
50 500 2.5
3.0 to 3.6 1.0 5.0
2.7
50 500 2.5
3.0 to 3.6 1.0 5.0
3.0 to 3.6 50 500 2.5 1.0 ns
r
OSLH
-40 to 85 °C
Min Max
6.0
1.0 6.0
1.0 6.0
= | t
PLHm
- t
PLHn
Table 9. Capacitive characteristics
Test condition Value
Symbol Parameter
V
CC
(V)
TA = 25 °C
Min Typ Max
Unit
ns
ns
ns
|,
Unit
C
C
C
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
Input capacitance 3.3 VIN = 0 to V
IN
Output capacitance 3.3 VIN = 0 to V
OUT
Power dissipation
PD
capacitance
(1)
CC(opr)
3.3
= CPD x VCC x fIN + ICC/4 (per gate)
= 10 MHz
f
IN
= 0 or V
V
IN
CC
CC
CC
5pF
10 pF
37 pF
Doc ID 4980 Rev 7 7/16
Page 8
Test circuit 74LCX125
5 Test circuit
Figure 4. Test circuit
Table 10. Test circuit
Tes t Sw itch
t
, t
PLH
PHL
t
, t
PZL
PLZ
, t
t
PZH
PHZ
C
= 50 pF or equivalent (includes jig and probe capacitance)
L
R
= 500 Ω or equivalent
L
R
T
= Z
of pulse generator (typically 50 Ω)
OUT
Open
6 V
GND
8/16 Doc ID 4980 Rev 7
Page 9
74LCX125 Waveforms
6 Waveforms
Figure 5. Propagation delay (f = 1 MHz; 50% duty cycle)
Figure 6. Output enable and disable time (f = 1 MHz; 50% duty cycle)
Doc ID 4980 Rev 7 9/16
Page 10
Package mechanical data 74LCX125
7 Package mechanical data
In order to meet environmental requirements, ST offers these devices in different grades of
ECOPACK
specifications, grade definitions and product status are available at: www.st.com.
ECOPACK
®
packages, depending on their level of environmental compliance. ECOPACK®
®
is an ST trademark.
10/16 Doc ID 4980 Rev 7
Page 11
74LCX125 Package mechanical data
SO-14 MECHANICAL DATA
DIM.
A 1.35 1.75 0.053 0.069
A1 0.1 0.25 0.004 0.010
A2 1.10 1.65 0.043 0.065
B 0.33 0.51 0.013 0.020
C 0.19 0.25 0.007 0.010
D 8.55 8.75 0.337 0.344
E 3.8 4.0 0.150 0.157
e 1.27 0.050
H 5.8 6.2 0.228 0.244
h 0.25 0.50 0.010 0.020
L 0.4 1.27 0.016 0.050
k0° 8°0° 8°
ddd 0.100 0.004
MIN. TYP MAX. MIN. TYP. MAX.
mm. inch
0016019D
Doc ID 4980 Rev 7 11/16
Page 12
Package mechanical data 74LCX125
TSSOP14 MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 1.2 0.047
A1 0.05 0.15 0.002 0.004 0.006
A2 0.8 1 1.05 0.031 0.039 0.041
b 0.19 0.30 0.007 0.012
c 0.09 0.20 0.004 0.0089
D 4.9 5 5.1 0.193 0.197 0.201
E 6.2 6.4 6.6 0.244 0.252 0.260
E1 4.3 4.4 4.48 0.169 0.173 0.176
e 0.65 BSC 0.0256 BSC
K0˚ 8˚0˚ 8˚
L 0.45 0.60 0.75 0.018 0.024 0.030
mm. inch
A2
A
PIN 1 IDENTIFICATION
A1
b
e
c
K
L
E
D
E1
1
0080337D
12/16 Doc ID 4980 Rev 7
Page 13
74LCX125 Package mechanical data
Tape & Reel SO-14 MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 6.4 6.6 0.252 0.260
Bo 9 9.2 0.354 0.362
Ko 2.1 2.3 0.082 0.090
Po 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
mm. inch
Doc ID 4980 Rev 7 13/16
Page 14
Package mechanical data 74LCX125
Tape & Reel TSSOP14 MECHANICAL DATA
DIM.
MIN. TYP MAX. MIN. TYP. MAX.
A 330 12.992
C 12.8 13.2 0.504 0.519
D 20.2 0.795
N 60 2.362
T 22.4 0.882
Ao 6.7 6.9 0.264 0.272
Bo 5.3 5.5 0.209 0.217
Ko 1.6 1.8 0.063 0.071
Po 3.9 4.1 0.153 0.161
P 7.9 8.1 0.311 0.319
mm. inch
14/16 Doc ID 4980 Rev 7
Page 15
74LCX125 Revision history
8 Revision history
Table 11. Revision history
Date Revision Changes
15-Sep-2004 5 Ordering codes revision - pag. 1
13-Jul-2006 6 New template, temperature ranges updated
Added Applications on page 1
Updated Table 1: Device summary on page 1
20-Jun-2012 7
Updated T
in Table 5: Recommended operating conditions
op
Updated ECOPACK
Minor textual updates
®
text in Section 7: Package mechanical data
Doc ID 4980 Rev 7 15/16
Page 16
74LCX125
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16/16 Doc ID 4980 Rev 7
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