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
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
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
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
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
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