MAX3420E Просмотр технического описания (PDF) - Maxim Integrated
Номер в каталоге
Компоненты Описание
производитель
MAX3420E Datasheet PDF : 23 Pages
| |||
MAX3420E
USB Peripheral Controller with SPI Interface
ESD Protection
D+, D-, and VBCOMP possess extra protection against
static electricity to protect the devices up to ±15kV. The
ESD structures withstand high ESD in all operating
modes: normal operation, suspend mode, and powered
down. VBCOMP and VCC require 1µF ceramic capacitors
connected to ground as close to the pins as possible. D+,
D-, and VBCOMP provide protection to the following limits:
●● ±15kV using the Human Body Model
●● ±8kV using the Contact Discharge method specified
in IEC 61000-4-2
●● ±12kV using the IEC 61000-4-2 Air Gap Method
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents test
setup, test methodology, and test results.
Human Body Model
Figure 18 shows the Human Body Model, and Figure
19 shows the current waveform generated when
discharged into a low impedance. This model consists
of a 100pF capacitor charged to the ESD voltage of
interest, which then discharges into the test device
through a 1.5kΩ resistor.
IEC 61000-4-2
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specif-
ically refer to integrated circuits. The major difference
between tests done using the Human Body Model and
IEC 61000-4-2 is a higher peak current in IEC 61000-
4-2, due to lower series resistance. Hence, the ESD
withstand voltage measured to IEC 61000-4-2 generally is
lower than that measured using the Human Body Model.
Figure 20 shows the IEC 61000-4-2 model. The Contact
Discharge method connects the probe to the device
before the probe is charged. The Air-Gap Discharge test
involves approaching the device with a charged probe.
Short-Circuit Protection
The MAX3420E withstands VBUS shorts to D+ and D- on
the USB connector side of the 33Ω series resistors.
RC
RD
1MΩ
1.5kΩ
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
100pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 18. Human Body ESD Test Models
IP 100%
90%
AMPERES
36.8%
10%
0
0 tRL
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
TIME
tDL
CURRENT WAVEFORM
Figure 19. Human Body Model Current Waveform
RC
50MΩ to 100MΩ
RD
330Ω
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
HIGH-
VOLTAGE
DC
SOURCE
Cs
150pF
STORAGE
CAPACITOR
DEVICE
UNDER
TEST
Figure 20. IEC 61000-4-2 ESD Test Model
www.maximintegrated.com
Maxim Integrated │ 21
Share Link: 