MAX3185 Datasheet, PDF (1/8 Pages) Maxim Integrated Products – ±15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs

19-1076; Rev 0; 9/96
±15kV ESD-Protected, EMC-Compliant, 230kbps
RS-232 Serial Port for Motherboards/Desktop PCs
_______________General Description
The MAX3185 is a complete DTE RS-232 serial port
designed to meet the stringent ESD requirements of the
European community. All transmitter outputs and receiv-
er inputs are protected to ±15kV using IEC 1000-4-2
Air-Gap Discharge, ±8kV using IEC 1000-4-2 Contact
Discharge, and ±15kV using the Human Body Model.
The MAX3185 has three RS-232 transmitters, five RS-
232 receivers, and no charge pump, optimizing it for
operation in desktop PC and motherboard applications.
It is guaranteed to run at data rates up to 230kbps, pro-
viding compatibility with popular software for communi-
cating with personal computers. Power-supply current
is less than 300µA for IDD and ISS, and less than 1mA
for ICC.
The MAX3185 is pin and functionally compatible with
the industry-standard 75185, so existing designs can
instantly become EMC compliant. The MAX3185 is
available in an SO package and in the tiny SSOP that
further reduces board space.
________________________Applications
Desktop PC
Motherboards
Instruments
Equipment Meeting IEC1000-4-2
____________________________Features
o Enhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC1000-4-2, Contact Discharge
±15kV—IEC1000-4-2, Air-Gap Discharge
o Latchup Free During an ESD Event
o 20-Pin SSOP and SO Packages
o Guaranteed 230kbps Data Rate
o Flow-Through Pinout
o Pin Compatible with SN75C185
o Complete DTE Serial Port
______________Ordering Information
PART
MAX3185CWP
MAX3185CAP
MAX3185EWP
MAX3185EAP
TEMP. RANGE
0°C to +70°C
0°C to +70°C
-40°C to +85°C
-40°C to +85°C
PIN-PACKAGE
20 SO
20 SSOP
20 SO
20 SSOP
__________Typical Operating Circuit __________________Pin Configuration
TTL/CMOS
LOGIC
I/O
MAX3186
T1
MAX3185
R1
T2
R2
RS-232
T3
R3
INTERCONNECTING
T4
R4
CABLE
T5
R5
R1
T1
R2
T2
R3
T3
TTL/CMOS
LOGIC
I/O
TOP VIEW
V_DD 1
R1IN 2
R2IN 3
R3IN 4
T1OUT 5
T2OUT 6
R4IN 7
T3OUT 8
R5IN 9
VSS 10
MAX3185
20 VCC
19 R1OUT
18 R2OUT
17 R3OUT
16 T1IN
15 T2IN
14 R4OUT
13 T3IN
12 R5OUT
11 GND
SO/SSOP
________________________________________________________________ Maxim Integrated Products 1
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