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bus buffer. LCX125 Datasheet |
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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
– tPD = 5.2 ns (max.) at VCC = 3 V
■ Power-down protection on inputs and outputs
■ Symmetrical output impedance
– |IOH| = IOL = 24 mA (min.) at VCC = 3 V
■ PCI bus levels guaranteed at 24 mA
■ Balanced propagation delay
– tPLH ≅ tPHL
■ Operating voltage range
– VCC (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
Applications
■ Automotive
■ Industrial
■ Computer
■ Consumer
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 C2MOS
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.
Table 1. Device summary
Order code
Temperature range
Package
Packaging
Marking
74LCX125TTR
74LCX125YTTR(1)
74LCX125MTR
74LCX125YMTR(1)
-40/+85 °C
-40/+85 °C
-40/+85 °C
-40/+85 °C
TSSOP14
TSSOP14 (automotive grade)
SO-14
SO-14 (automotive grade)
Tape and reel
Tape and reel
Tape and reel
Tape and reel
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
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www.st.com
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Contents
Contents
74LCX125
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
Recommended operating conditions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Test circuit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
6
Waveforms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
7
Package information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
8
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
2/16
Doc ID 4980 Rev 8
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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
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