Datasheet

The ESD-protected pins are tested with reference to the
ground pin in a powered-down condition. They are test-
ed to ±15kV using the Human Body Model.
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 14a shows the Human Body Model, and Figure
14b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the test device
through a 1.5kΩ resistor.
Machine Model
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. The objective is to emulate the stress caused
when I/O pins are contacted by handling equipment
during test and assembly. All pins require this protec-
tion, not just RS-485 inputs and outputs.
MAX3080E–MAX3089E
±15kV ESD-Protected, Fail-Safe, High-Speed (10Mbps),
Slew-Rate-Limited RS-485/RS-422 Transceivers
______________________________________________________________________________________ 15
R
R
Y
Z
V
OD
V
OC
Figure 5. Driver DC Test Load
RECEIVER
OUTPUT
TEST POINT
1k
1k
S1
S2
V
CC
C
RL
15pF
Figure 6. Receiver Enable/Disable Timing Test Load
DIP/SO
TOP VIEW
1
2
3
4
5
6
7
14
13
12
11
10
9
8
V
CC
RXP
TXP
A
B
Z
Y
RO
RE
DE
DI
SRL
GND
H/F
MAX3089E
RD
V
CC
TXP
A
B
Z
Y
GND DE SRL
DI
MAX3089E
H/F
RE
NOTE: SWITCH POSITIONS
INDICATED FOR H/F = GND
RXP
Figure 4. MAX3089E Pin Configuration and Functional Diagram