MAX3032ECSE データシートの表示（PDF） - Maxim Integrated
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MAX3032ECSE Datasheet PDF : 14 Pages
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±15kV ESD-Protected, 3.3V Quad
RS-422 Transmitters
sents the minimum parasitic capacitance that would
exist in a typical application. In most cases, more
capacitance exists in the system and reduces the mag-
nitude of the glitch. During a “hot-swap” event when the
driver is connected to the line and is powered up, the
driver must not cause the differential signal to drop
below 200mV (Figures 12 and 13).
Operation of Enable Pins
The MAX3030E–MAX3033E family has two enable-func-
tional versions.
The MAX3030E/MAX3031E are compatible with
26LS31, where the two enable signals control all four
transmitters (global enable).
The MAX3032E/MAX3033E are compatible with the
SN75174. EN1&2 controls transmitters 1 and 2, and EN
3&4 controls transmitters 3 and 4 (dual enable).
Typical Applications
The MAX3030E–MAX3033E offer optimum performance
when used with the MAX3094E/MAX3096 3.3V quad
differential line receivers. Figure 14 shows a typical RS-
422 connection for transmitting and receiving data.
VCC
1V/div
VCC
1V/div
DO_+ - DO_-
DO_+
DO_-
4µs/div
Figure 12. Differential Power-Up Glitch (0.1V/µs)
DO_+ - DO_-
DO_+
DO_-
1.0µs/div
Figure 13. Differential Power-Up Glitch (1V/µs)
Table 1. MAX3030E/MAX3031E Transmitter Controls
EN
EN
TX1
TX2
TX3
0
0
Active
Active
Active
0
1
High-Z
High-Z
High-Z
1
0
Active
Active
Active
1
1
Active
Active
Active
TX4
Active
High-Z
Active
Active
MODE
All transmitters active
All transmitters disabled
All transmitters active
All transmitters active
Table 2. MAX3032E/MAX3033E Transmitter Controls
EN1&2
0
0
1
1
EN3&4
0
1
0
1
TX1
High-Z
High-Z
Active
Active
TX2
High-Z
High-Z
Active
Active
TX3
High-Z
Active
High-Z
Active
TX4
High-Z
Active
High-Z
Active
MODE
All transmitters disabled
Tx 3 and 4 active
Tx 1 and 2 active
All transmitters active
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