MAX3162 MAXIM [Maxim Integrated Products], MAX3162 Datasheet - Page 16

• Manufacturer Part Number: MAX3162
• Description: +3.0V to +5.5V, 1uA, RS-232/RS-485/422 Multiprotocol Transceivers
• Manufacturer: MAXIM [Maxim Integrated Products]

RS-232 Transmitters
+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
Table 1. MAX3160
16
Table 3. MAX3162
Table 2. MAX3161
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
SHDN
SHDN
SHDN
______________________________________________________________________________________
0
1
1
1
X
0
1
1
0
1
1
1
RS-485/
RSCCC
RS-485/
INPUTS
RSCCC
TE232
INPUTS
INPUTS
-232
X
0
0
1
X
0
1
1
X
0
0
1
-232
DE485/T2IN
DE485/T2IN
T1IN,T2IN
DI/T1IN,
DI/T1IN,
X
0
1
X
X
X
0
1
X
X
0
1
High Data Rates
RS-485 mode
Z(B)/T1OUT,
Y(A)/T2OUT
1/8-unit load
OUTPUTS
OUTPUTS
OUTPUTS
T1OUT,
T2OUT
T1OUT,
High-Z
High-Z
T2OUT
High-Z
High-Z
1
0
1
0
1
0
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.
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
Table 6. MAX3162
Table 4. MAX3160
Table 5. MAX3161
SHDN
SHDN
SHDN
X
X
X
X
X
X
X
X
X
X
X
X
RSCCC
RS-485/
RS-485/
RSCCC
RS-232
INPUTS
INPUTS
INPUTS
256 Transceivers on the Bus
-232
1
0
0
0
0
0
0
1
0
0
0
1
-232
Inputs Open
Inputs Open
Inputs open
R1IN, R2IN
R1IN,R2IN
B/R1IN,
A/R2IN
X
0
1
RS-232 Receivers
0
1
X
0
1
X
Truth Tables
RS-485 mode
RS-485 mode
RO/R2OUT in
RO/R2OUT in
RO/R2OUT
RO/R2OUT
OUTPUTS
OUTPUTS
OUTPUTS
R1OUT,
R1OUT,
R1OUT,
R2OUT
High-Z,
R1OUT
R1OUT
High-Z
High-Z,
1
0
1
1
0
1
1
0
1