Datasheet

±15kV ESD Protection
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The driver outputs and receiver inputs have
extra protection against static electricity. Maxim’s engi-
neers have developed state-of-the-art structures to pro-
tect these pins against ESD of ±15kV without damage.
The ESD structures withstand high ESD in all states.
After an ESD event, the MAX3535E/MXL1535E keep
working without latchup. ESD protection can be tested
in various ways. The transmitter outputs and receiver
inputs of this product family are characterized for pro-
tection to ±15kV using the Human Body Model.
ESD Test Conditions
The ±15kV ESD test specifications apply only to the A,
B, Y, and Z I/O pins. The test surge is referenced to
GND2. All remaining pins are ±2kV ESD protected.
Human Body Model
Figure 14 shows the Human Body Model, and Figure
15 shows the current waveform it generates when dis-
charged into low impedance. This model consists of a
100pF capacitor charged to the ESD voltage of interest,
which is then discharged into the test device through a
1.5kΩ resistor.
+3V to +5V, 2500V
RMS
Isolated RS-485/RS-422
Transceivers with ±15kV ESD Protection
Table 6. Transformers for MAX3535E at +3.3V
MANUFACTURER
PART
NUMBER
ISOLATION
VOLTAGE (1s)
PHONE
NUMBER
WEBSITE
TGM-040 500V
RMS
TGM-240 2000V
RMS
TGM-340 3000V
RMS
HALO Electronics, Inc.
TGM-340 4500V
RMS
650-903-3800 www.haloelectronics.com/6pin.html
BH Electronics, Inc. 500-2582 2000V
RMS
952-894-9590
www.bhelectronics.com/PDFs/DC-
DCConverterTransformers.pdf
Coilcraft, Inc. Q4470-C 1500V
RMS
800-322-2645
44-1236-730595
www.coilcraft.com/minitrans.cfm
78253335 1500V
Newport/C&D Technologies
76253335 4000V
520-295-4300 www.dc-dc.com/products/productline.asp?ED=9
95062 1250V
Midcom, Inc.
95063 1250V
605-886-4385 www.midcom-inc.com
PCA Electronics, Inc. EPC3115S-2 700V DC 818-894-5791 www.pca.com/Datasheets/EPC3117S-X.pdf
Rhom b us Ind ustr i es, Inc. T-1107 1800V
RMS
714-898-0960 www.rhombus-ind.com/pt-cat/maxim.pdf
Premier Magnetics Inc. PM-SM16 1500V
RMS
949-452-0511 www.premiermag.com/pdf/pmsm15.pdf
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
100pF
R
C
1MΩ R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 14. Human Body ESD Test Model
MAX3535E/MXL1535E
22
Maxim Integrated
MAX3535E/MXL1535E