MAX3170 View Datasheet(PDF) - Maxim Integrated
Part Name
Description
Manufacturer
MAX3170 Datasheet PDF : 16 Pages
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+3.3V, Multiprotocol, 3 Tx/3 Rx, Software-
Selectable Clock/Data Transceiver
PIN
1
2
3
4
5, 6, 7
8, 9, 10
11, 12, 13
14
15, 18
16, 17
19
20
21, 23
22, 24
25
26
27
28
NAME
V+
C2+
C2-
V-
T_IN
R_OUT
M_
DCE/DTE
R_INB
R_INA
T3OUTB/R1INB
T3OUTA/R1INA
T_OUTB
T_OUTA
C1-
GND
Pin Description
FUNCTION
Positive Supply Generated by the Charge Pump. Bypass V+ to ground with a 3.3µF ceramic
capacitor.
Positive Terminal of the Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 1µF
ceramic capacitor.
Negative Terminal of the Inverting Charge-Pump Capacitor. Connect C2+ to C2- with a 1µF
ceramic capacitor.
Negative Supply Generated by the Charge Pump. Bypass V- to ground with a 3.3µF ceramic
capacitor.
Transmitter CMOS Inputs (T1IN, T2IN, T3IN)
Receiver CMOS Outputs (R1OUT, R2OUT, R3OUT)
Mode Select Pins (M0, M1, M2). Internally pulled up to VCC. See Table 1 for detailed
information.
DCE/DTE Mode Select Pin. Logic level high selects DCE interface; logic level low selects
DTE interface. Internally pulled up to VCC.
Noninverting Receiver Inputs (R3INB, R2INB)
Inverting Receiver Inputs (R3INA, R2INA)
Noninverting Transmitter Output/Noninverting Receiver Input
Inverting Transmitter Output/Inverting Receiver Input
Noninverting Transmitter Outputs (T2OUTB, T1OUTB)
Inverting Transmitter Outputs (T2OUTA, T1OUTA)
Negative Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect C1+ to C1- with
a 1µF ceramic capacitor.
Ground
VCC
+3.3V Supply Voltage (±5%). Bypass V CC to ground with a 3.3µF capacitor.
C1+
Positive Terminal of the Voltage-Doubler Charge-Pump Capacitor. Connect C1+ to C1- with a
1µF ceramic capacitor.
Detailed Description
The MAX3170 is a three-driver/three-receiver multipro-
tocol transceiver that operates from a +3.3V single sup-
ply. The MAX3170, along with the MAX3171/MAX3173
and MAX3172/MAX3174, form a complete software-
selectable DTE or DCE interface port that supports the
V.28 (RS-232), V.11 (RS-449/V.36, EIA530, EIA530-A,
and X.21), and V.35 protocols. The MAX3170 transceiv-
er carries the high-speed clock and data signals, while
the MAX3171 or MAX3173 carries the control signals.
The MAX3170 can be terminated by the MAX3172 or
MAX3174 software-selectable resistor termination net-
work or by a discrete termination network.
The MAX3170 features a 1mA no-cable mode, true fail-
safe operation, and thermal shutdown circuitry. Thermal
shutdown protects the drivers against excessive power
dissipation. When activated, the thermal shutdown cir-
cuitry places the driver outputs into a high-impedance
state.
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