MAX3160CAP+T Maxim Integrated Products, MAX3160CAP+T Datasheet - Page 18

• Manufacturer Part Number: MAX3160CAP+T
• Description: IC TXRX RS232/485/422 20SSOP
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX3160CAP+T

• Number Of Drivers/receivers: 2/2
• Protocol: RS232, RS422, RS485
• Voltage - Supply: 3 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 20-SSOP
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

+3.0V to+5.5V, 1µA, RS-232/RS-485/422
Multiprotocol Transceivers
ceivers to be connected in parallel on one communica-
tion line. The MAX3161/MAX3162 have a 1/8-unit load
receiver input impedance (96kΩ), allowing up to 256
transceivers to be connected in parallel on one com-
munication line. Any combination of these devices
and/or other RS-485 transceivers with a total of 32-unit
loads or fewer can be connected to the line.
The MAX3160/MAX3161/MAX3162 RS-485 driver out-
puts are 1/8-unit load when disabled This impedance
may be reduced if the D1 pin is toggled at a high fre-
quency. With no power applied (V
485 transmitter output impedances typically go to 1/2-
unit load on the MAX3161/MAX3162, and to one-unit
load on the MAX3160.
Two mechanisms prevent excessive output current and
power dissipation caused by faults or by bus con-
tention. The first, a foldback current limit on the output
stage, provides immediate protection against short cir-
cuits over the whole common-mode voltage range (see
18
Table 12. MAX3162
Table 11. MAX3161
RS485/
______________________________________________________________________________________
X
0
1
1
1
1
1
1
1
1
1
1
0
INPUTS
X
1
0
0
0
Driver Output Protection
0
1
1
1
1
1
1
X
Inputs Open
-200mV
A - B
-50mV
X
X
CC
= GND), the RS-
HDPLX
INPUTS
X
0
0
0
1
1
1
X
OUTPUT
High-Z
High-Z
RO
1
0
1
Floating
-200mV
Typical Operating Characteristics ). The second, a ther-
mal shutdown circuit, forces the driver outputs into a
high-impedance state if the die temperature becomes
excessive.
EIA/TIA-485 standards require a common input voltage
range of -7V to +12V to prevent damage to the device.
The MAX3160/MAX3161/MAX3162 inputs are protected
to RS-232 levels of ±25V for the receiver inputs and
±13.2V for the transmitter/driver outputs. This provides
additional protection for the RS-485 transceivers
against ground differential or faults due to miswiring.
The MAX3160/MAX3161/MAX3162 can be configured
for slew-rate limiting by pulling FAST low. This minimizes
EMI and reduces reflections caused by improperly ter-
minated cables. Operation in slew-rate limited mode
reduces the amplitudes of high-frequency harmonics.
Table 13. Required Minimum Capacitance
Values
-50mV
A - B
SUPPLY VOLTAGE
X
X
X
X
X
RS-485/422 Reduced EMI and Reflections
+3.0 TO +3.6
+4.5 TO +5.5
+3.0 TO +5.5
(V)
Protection Against Wiring Faults
Truth Tables (continued)
Y(A) - Z(B)
Floating
-200mV
-50mV
X
X
X
X
X
C1 (µF)
0.047
0.1
0.1
C2, C3, C4, C
High-Z up to V
RS-232 Mode
RO/R2OUT
OUTPUT
0.33
0.47
(µF)
0.1
1
0
1
1
0
1
BYPASS
CC