Datasheet

+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
High Data Rates
The MAX3160/MAX3161/MAX3162 maintain the RS-232
±5.0V required minimum transmitter output voltage even
at high data rates. Figure 11 shows a transmitter loop-
back test circuit. Figure 12 shows a loopback test result
at 250kbps, and Figure 13 shows the same test at
1000kbps. Figure 12 demonstrates a single slew-rate
limited transmitter driven at 250kbps (FAST = GND) into
an RS-232 load in parallel with 1000pF. Figure 13 shows
a single transmitter driven at 1Mbps (FAST asserted),
loaded with an RS-232 receiver in parallel with 1000pF.
These transceivers maintain the RS-232 ±5.0V minimum
transmitter output voltage at data rates up to 1Mbps.
256 Transceivers on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and the standard driver can drive up to
32-unit loads. The MAX3160 has a 1/4-unit load receiv-
er input impedance (48kΩ), allowing up to 128 trans-
INPUTS OUTPUTS
SHDN
RS485
RR
RR
SS
SS
22
22
33
33
22
22
DI/T1IN,
DE485/T2IN
Z(B)/T1OUT,
Y(A)/T2OUT
0 X X 1/8 Unit Load
10 0 1
10 1 0
1 1 X RS-485 Mode
Table 1. MAX3160
INPUTS OUTPUTS
SHDN
RS-485/
RS-232
DI/T1IN,
DE485/T2IN
T1OUT,
T2OUT
0 X X High-Z
10 0 1
10 1 0
1 1 X High-Z
Table 2. MAX3161
INPUTS OUTPUTS
SHDN TE232 T1IN,T2IN
T1OUT,
T2OUT
0 X X High-Z
X 0 X High-Z
11 0 1
11 1 0
Table 3. MAX3162
INPUTS OUTPUTS
SHDN
RS-485/
RR
RR
SS
SS
--
--
22
22
33
33
22
22
B/R1IN,
A/R2IN
R1OUT,
RO/R2OUT
X0 0 1
X0 1 0
X 0 Inputs Open 1
X1 X
R1OUT
High-Z,
RO/R2OUT in
RS-485 mode
Table 4. MAX3160
INPUTS OUTPUTS
SHDN
RS-485/
RR
RR
SS
SS
--
--
22
22
33
33
22
22
R1IN, R2IN
R1OUT,
RO/R2OUT
X0 0 1
X0 1 0
X 0 Inputs Open 1
X1 X
R1OUT
High-Z,
RO/R2OUT in
RS-485 mode
Table 5. MAX3161
RS-232 Transmitters
INPUTS OUTPUTS
SHDN RE232 R1IN, R2IN
R1OUT,
R2OUT
X 1 X High-Z
X0 0 1
X0 1 0
X 0 Inputs open 1
Table 6. MAX3162
RS-232 Receivers
Truth Tables
16
Maxim Integrated
MAX3160/MAX3161/MAX3162