SP2209E Datasheet, PDF (12/15 Pages) Sipex Corporation – High ESD Dual Port RS-232 Transceiver

R_CC
DC Power
Source
SSWW11
Contact-Discharge Module
RR_SS
R_V
SSWW22
Device
C_SS
Under
Test
RS and RV add up to 330Ω for IEC1000-4-2.
Figure 11. ESD Test Circuit for EN61000-4-2
to Data Circuit Terminating Equipment (DCE)
interface implementation, 2 data lines, TxD and
RxD, and 6 control lines, RTS, DTR, DSR,
CTS, and RI, are required. The straight-through
pinout for data lines in the SP2209E device
allows a simplified PCB layout allowing ground
lines to separate the signal lines and ground
planes to be placed beneath the IC without the
complication of a multi-layer PCB layout.
A receiver from each port, R INA and R INB,
5
5
are active while the rest of the channels are
powered down. This allows the SP2209E
device to monitor peripheral devices while the
rest of the system is in a power-saving standby
mode. Fail-Safe receiver outputs are pulled high
if the receiver inputs are left unconnected or at
zero input. The SP2209E device can be
implemented as a power management device to
wake up the entire system when any
communication is initiated in peripheral
devices. The SP2209E device has a low standby
current of 100µA.
A standard serial mouse can be powered from
the SP2209E drivers. Two driver outputs
connected in parallel and set to V_OH can be used
to supply power to the V+ pin of the mouse. The
third driver is set to VOL to link current from the
V- terminal. Typical mouse specifications are
10mA at +6V and 5mA at -6V.
LapLink Compatibility
The SP2209E can operate up to 460kbps data
rate under maximum driveload conditions of
C_L = 1000pF and R_L = 3KΩ at minimum power
supply voltages.
30A
15A
0A
t=0ns
t=30ns
t¥
Figure 12. ESD Test Waveform for EN61000-4-2
DEVICE PIN
TESTED
HUMAN BODY
IEC1000-4-2
MODEL
Air Discharge Direct Contact
Level
Driver Outputs
+15kV
+15kV
+8kV
4
Receiver Inputs
+15kV
+15kV
+8kV
4
Table 2. Transceiver ESD Tolerance Levels
SP2209E DS/06
SP2209E High ESD Dual Port RS-232 Transceivers
12
© Copyright 2000 Sipex Corporation