Datasheet

ESD protection can be tested in various ways; the trans-
mitter outputs and receiver inputs for the MAX3222E/
MAX3232E/MAX3241E/MAX3246E are characterized for
protection to the following limits:
● ±15kV using the Human Body Model
● ±8kV using the Contact Discharge method specified
in IEC 1000-4-2
● ±9kV (MAX3246E only) using the Contact Discharge
method specified in IEC 1000-4-2
● ±15kV using the Air-Gap Discharge method specified
in IEC 1000-4-2
Figure 4a. Human Body ESD Test Model Figure 4b. Human Body Model Current Waveform
Figure 5a. IEC 1000-4-2 ESD Test Model Figure 5b. IEC 1000-4-2 ESD Generator Current Waveform
Table 1. MAX3222E/MAX3237E/MAX3241E/
MAX3246E Shutdown and Enable Control
Truth Table
SHDN EN T_OUT R_OUT
R_OUTB
(MAX3237E/
MAX3241E)
0 0
High
impedance
Active Active
0 1
High
impedance
High
impedance
Active
1 0 Active Active Active
1 1 Active
High
impedance
Active
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
100pF
R
C
1MΩ
R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE-
UNDER-
TEST
I
P
100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPERES
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
150pF
R
C
50MΩ to 100MΩ
R
D
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE-
UNDER-
TEST
t
r
= 0.7ns to 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
www.maximintegrated.com
Maxim Integrated │ 11
MAX3222E/MAX3232E/
MAX3237E/MAX3241E/
MAX3246E
±15kV ESD-Protected, Down to 10nA,
3.0V to 5.5V, Up to 1Mbps,
True RS-232 Transceivers