|
|
PDF MAX14541E Data sheet ( Hoja de datos )
| Número de pieza | MAX14541E | |
| Descripción | ESD-Protection Array | |
| Fabricantes | Maxim Integrated Products | |
| Logotipo |  |
|
Hay una vista previa y un enlace de descarga de MAX14541E (archivo pdf) en la parte inferior de esta página. Total 8 Páginas | ||
|
No Preview Available !
www.Da1t9a-S4h50e3e;t4RUev.c0o;m4/09
3-Channel, Low-Leakage ESD Protector
General Description
The MAX14541E low-capacitance Q15kV ESD-protection
diode array is designed to protect sensitive electronics
attached to communication lines. Each channel consists
of a pair of diodes that steer ESD current pulses to VCC
or GND.
The MAX14541E protects against ESD pulses up to
Q15kV Human Body Model (HBM) and Q15kV Air-Gap
Discharge, as specified in IEC 61000-4-2. The device
has a 6pF (typ) on-capacitance per channel, making
them ideal for use on high-speed data I/O interfaces.
The MAX14541E is a triple I/O protector designed for
biometric connectors, portable connectors, and SVGA
video connections with ultra-low leakage current.
The device is available in a 5-pin SC70 package and is
specified over the -40NC to +125NC automotive operating
temperature range.
Glucose Meters
MP3 Players
Digital Cameras
Handheld Equipment
Applications
Features
S High-Speed Data Line ESD Protection
±15kV Human Body Model
±15kV IEC 61000-4-2 Air-Gap Discharge
±8kV IEC 61000-4-2 Contact Discharge
S 6pF (typ) Low Input Capacitance
S 1nA (max) Low-Leakage Current
S +0.9V to +16V Supply Voltage Range
S 5-Pin SC70 (2.0mm x 2.2mm) Package
Ordering Information
PART
TEMP
RANGE
PIN-
PACKAGE
MAX14541EAXK+T -40NC to +125NC 5 SC70
+Denotes a lead(Pb)-free/RoHS-compliant package.
T = Tape and reel.
TOP
MARK
ATY
TOP VIEW
VCC
GND
I/O-1
+
1
2 MAX14541E
3
5
4
SC70
I/O-3
I/O-2
Pin Configuration
________________________________________________________________ Maxim Integrated Products 1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
1 page  
www.DataSheet4U.com
3-Channel, Low-Leakage ESD Protector
________________Detailed Description
The MAX14541E low-leakage, low-capacitance, Q15kV
ESD-protection diode arrays are suitable for high-speed
and general-signal ESD protection. Low input capaci-
tance makes this device ideal for ESD protection of
high-speed signals. Each channel consists of a pair of
diodes that steer ESD current pulses to VCC or GND. The
MAX14541E is a 3-channel device (see the Functional
Diagram).
The MAX14541E is designed to work in conjunction with
a device’s intrinsic ESD protection. The MAX14541E
limits the excursion of the ESD event to below Q25V
peak voltage when subjected to the Human Body Model
waveform. When subjected to the IEC 61000-4-2 Contact
Discharge waveform, the peak voltage is limited to
Q60V. The peak voltage is limited to Q100V when sub-
jected to Air-Gap Discharge. The device protected by
the MAX14541E must be able to withstand these peak
voltages, plus any additional voltage generated by the
parasitic of the board.
___________Applications Information
Design Considerations
Maximum protection against ESD damage results from
proper board layout (see the Layout Recommendations
section). A good layout reduces the parasitic series
inductance on the ground line, supply line, and protect-
ed signal lines. The MAX14541E ESD diodes clamp the
voltage on the protected lines during an ESD event and
shunt the current to GND or VCC. In an ideal circuit, the
clamping voltage (VC) is defined as the forward voltage
drop (VF) of the protection diode, plus any supply volt-
age present on the cathode.
For positive ESD pulses:
VC = VCC + VF
For negative ESD pulses:
VC = -VF
The effect of the parasitic series inductance on the lines
must also be considered (Figure 1).
For positive ESD pulses:
VC
=
VCC
+
VF(D1)
+
L1 ×
d(IESD)
dt
+
L2
×
d(IESD )
dt
For negative ESD pulses:
VC
=
− VF(D2)
+
L1
×
d(IESD )
dt
+
L3
×
d(IEdSt D)
where IESD is the ESD current pulse.
During an ESD event, the current pulse rises from zero
to peak value in nanoseconds (Figure 2). For example,
in a +15kV IEC 61000-4-7 Air-Gap Discharge ESD event,
the pulse current rises to approximately 45A in 1ns
(di/dt = 45 x 109). An inductance of only 10nH adds an
additional 450V to the clamp voltage, and represents
approximately 0.5in of board trace. Regardless of the
device’s specified diode clamp voltage, a poor layout
with parasitic inductance significantly increases the
effective clamp voltage at the protected signal line.
Minimize the effects of parasitic inductance by placing
the MAX14541E as close as possible to the connector
(or ESD contact point).
A low-ESR 0.1FF capacitor is required between VCC and
GND to get the maximum ESD protection possible. This
bypass capacitor absorbs the charge transferred by a
positive ESD event. Ideally, the supply rail (VCC) would
absorb the charge caused by a positive ESD strike
without changing its regulated value. All power supplies
have an effective output impedance on their positive
rails. If a power supply’s effective output impedance is
1I, then by using V = I x R, the clamping voltage of VC
increases by the equation VC = IESD x ROUT. A +8kV IEC
61000-4-2 ESD event generates a current spike of 24A.
The clamping voltage increases by VC = 24A x 1I, or
VC = 24V. Again, a poor layout without proper bypassing
increases the clamping voltage. A ceramic chip capaci-
tor mounted as close as possible to the MAX14541E
VCC pin is the best choice for this application. A bypass
capacitor should also be placed as close as possible to
the protected device.
POSITIVE SUPPLY RAIL
L1
PROTECTED
LINE
L2
D1
I/O_
D2
L3
GROUND RAIL
Figure 1. Parasitic Series Inductance
_______________________________________________________________________________________ 5
5 Page | ||
| Páginas | Total 8 Páginas | |
| PDF Descargar | [ Datasheet MAX14541E.PDF ] | |
Hoja de datos destacado
| Número de pieza | Descripción | Fabricantes |
| MAX14541E | ESD-Protection Array | Maxim Integrated Products |
| Número de pieza | Descripción | Fabricantes |
| SLA6805M | High Voltage 3 phase Motor Driver IC. |
 Sanken |
| SDC1742 | 12- and 14-Bit Hybrid Synchro / Resolver-to-Digital Converters. |
 Analog Devices |
|
DataSheet.es es una pagina web que funciona como un repositorio de manuales o hoja de datos de muchos de los productos más populares, |
| DataSheet.es | 2020 | Privacy Policy | Contacto | Buscar |