Rainbow Electronics MAX13175E - Manual (Page 35)

MAX13171E/MAX13173E/MAX13175E
Multiprotocol, Pin-Selectable
Data Interface Chipset
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T1
T2
T3
R3
R2
R1
T1
T2
T3
D4
TXD
SCTE
TXC
RXC
RXD
LL
T4
R4
T4
R3
R2
R1
104Ω
104Ω
104Ω
104Ω
104Ω
MAX13171E MAX13175E MAX13175E MAX13171E
T1
T2
T3
R3
R2
R1
T3
T2
T1
RTS
DTR
DCD
DSR
CTS
R1
R2
R3
MAX13173E MAX13173E
SERIAL
CONTROLLER
TXD
SCTE
TXC
RXC
RXD
RTS
DTR
DCD
DSR
CTS
LL
SERIAL
CONTROLLER
TXD
SCTE
TXC
RXC
RXD
RTS
DTR
DCD
DSR
CTS
LL
DCE DTE
Figure 30. DCE-to-DTE X.21 Interface
Complete Multiprotocol X.21 Interface
A complete DTE-to-DCE interface operating in X.21
mode is shown in Figure 30. The MAX13171E is used to
generate the clock and data signals, and the
MAX13173E generates the control signals and local
loopback (LL). The MAX13175E is used to terminate the
clock and data signals to support the V.11 protocol for
cable termination. The control signals do not need
external termination.
ESD Protection
ESD-protection structures are incorporated on all pins to
protect against electrostatic discharges encountered
during handling and assembly. The driver outputs and
receiver inputs of the MAX13171E/MAX13173E have
extra protection against static electricity. Maxim’s engi-
neers have developed state-of-the-art structures to pro-
tect these pins against ESD of ±15kV without damage.
The ESD structures withstand high ESD in all states: nor-
mal operation, shutdown, and powered down. After an
ESD event, the MAX13171E/MAX13173E/MAX13175E
keep working without latchup or damage. ESD protec-
tion can be tested in various ways. The
Electrical
Characteristics table shows the various limits for each
device and they are characterized for protection to the
following methods:
• Human Body Model
• Contact Method specified in IEC 61000-4-2
• Air-Gap Discharge Method specified in IEC 61000-4-2