MAX3185EWP [MAXIM]
【15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs; 【 15kV ESD保护，符合EMC标准， 230kbps的RS - 232串行端口的主板/台式电脑
| 型号： | MAX3185EWP |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | 【15kV ESD-Protected, EMC-Compliant, 230kbps RS-232 Serial Port for Motherboards/Desktop PCs |
| 文件： | 总8页 (文件大小：67K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-1076; Rev 0; 9/96
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
MAX3185
_______________Ge n e ra l De s c rip t io n
____________________________Fe a t u re s
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.
♦ Enhanced ESD Protection:
±15kV—Human Body Model
±8kV—IEC1000-4-2, Contact Discharge
±15kV—IEC1000-4-2, Air-Gap Discharge
♦ Latchup Free During an ESD Event
♦ 20-Pin SSOP and SO Packages
♦ Guaranteed 230kbps Data Rate
♦ Flow-Through Pinout
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
♦ Pin Compatible with SN75C185
♦ Complete DTE Serial Port
is less than 300µA for I
and I , and less than 1mA
DD
SS
for I
.
CC
The MAX3185 is pin and functionally compatible with
the industry-standard 75185, so existing designs can
ins ta ntly b e c ome EMC c omp lia nt. The MAX3185 is
available in an SO package and in the tiny SSOP that
further reduces board space.
______________Ord e rin g In fo rm a t io n
PART
TEMP. RANGE
0°C to +70°C
PIN-PACKAGE
20 SO
MAX3185CWP
MAX3185CAP
MAX3185EWP
MAX3185EAP
________________________Ap p lic a t io n s
0°C to +70°C
20 SSOP
20 SO
Desktop PC
-40°C to +85°C
-40°C to +85°C
20 SSOP
Motherboards
Instruments
Equipment Meeting IEC1000-4-2
__________Typ ic a l Op e ra t in g Circ u it
__________________P in Co n fig u ra t io n
MAX3186
MAX3185
TOP VIEW
V
1
2
V
CC
20
19
18
17
16
15
14
13
12
11
DD
R1
T1
R1OUT
R2OUT
R3OUT
T1IN
R1IN
R2IN
T2
T3
T4
T5
R1
R2
R3
R2
R3
R4
R5
T1
T2
T3
3
RS-232
INTERCONNECTING
CABLE
TTL/CMOS
LOGIC
I/O
TTL/CMOS
LOGIC
I/O
R3IN
4
T1OUT
T2OUT
R4IN
5
T2IN
6
R4OUT
T3IN
7
T3OUT
R5IN
8
R5OUT
GND
9
V
SS
10
MAX3185
SO/SSOP
________________________________________________________________ Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
ABSOLUTE MAXIMUM RATINGS
V
CC
...........................................................................-0.3V to +7V
Continuous Power Dissipation (T = +70°C)
A
V
.........................................................................-0.3V to +14V
......................................................................... +0.3V to -14V
Wide SO (derate 10.00mW/°C above +70°C)..............800mW
SSOP (derate 8.00mW/°C above +70°C) ....................640mW
Operating Temperature Ranges
DD
V
SS
Input Voltages
T
R
........................................................................-0.3V to +6V
...................................................................................±30V
MAX3185C_ P .....................................................0°C to +70°C
MAX3185E_ P ..................................................-40°C to +85°C
Storage Temperature Range ............................-65°C to +160°C
Lead Temperature (soldering, 10sec) ............................+300°C
IN
IN
Output Voltages
.................................................................................±15V
T
OUT
R
.......................................................-0.3V to (V + 0.3V)
OUT
CC
MAX3185
Short-Circuit Duration
T
R
(one at a time)...............................................Continuous
(one at a time) ..............................................Continuous
OUT
OUT
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional
operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to
absolute maximum rating conditions for extended periods may affect device reliability.
ELECTRICAL CHARACTERISTICS
(V = +4.5V to +5.5V, V = +10.8V to +13.2V, V = -10.8V to -13.2V, T = T
to T , unless otherwise noted. Typical values
MAX
CC
DD
SS
A
MIN
are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
V
DC CHARACTERISTICS
V
CC
4.5
5.5
13.2
-10.8
1500
500
Operating Voltage Range
V
DD
10.8
-13.2
V
SS
I
CC
No load
No load
No load
380
185
185
Supply Current
I
DD
µA
I
SS
500
LOGIC
Input Logic Threshold Low
Input Logic Threshold High
Input Leakage Current
Output Voltage Low
Output Voltage High
TRANSMITTER OUTPUTS
V
T
0.8
V
V
ILT
IN
V
IHT
T
IN
2.0
0.01
1
µA
V
V
OLR
R
R
; I = 3.2mA
OUT SINK
0.4
V
OHR
; I
= 1mA
V
- 0.6
V
OUT SOURCE
CC
V
= 7.0V, V = -7.0V, R = 3kΩ
±5.0
±9.5
300
DD
SS
L
Output Voltage Swing
V
Ω
V
DD
= 12V, V = -12V, R = 3kΩ
SS
L
Transmitter Output Resistance
V
CC
= V = V = 0V, V
= ±2V
DD
SS
T_OUT
RS-232 Output Short-Circuit
Current
±35
±60
25
mA
RECEIVER INPUTS
Receiver Input Voltage
Operating Range
-25
V
RS-232 Input Threshold Low
RS-232 Input Threshold High
RS-232 Input Hysteresis
0.75
V
V
2.4
7
0.65
5
V
RS-232 Input Resistance
3
kΩ
Receiver Output Short-Circuit
Current
±10
mA
2
_______________________________________________________________________________________
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
MAX3185
ELECTRICAL CHARACTERISTICS (continued)
(V = +4.5V to +5.5V, V = +10.8V to +13.2V, V = -10.8V to -13.2V, T = T
to T , unless otherwise noted. Typical values
MAX
CC
DD
SS
A
MIN
are at T = +25°C.)
A
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
ESD CHARACTERISTICS
Human Body Model
±15
±8
ESD Protection
IEC1000-4-2 (Contact Discharge)
IEC1000-4-2 (Air-Gap Discharge)
kV
±15
TIMING CHARACTERISTICS
Transmitter Output
Propagation Delay, Low to High
V
= 12V, V = -12V, R = 3kΩ,
DD SS L
t
t
4
µs
µs
µs
PLHT
PHLT
C = 1000pF, T = +25°C
L A
Transmitter Output
Propagation Delay, High to Low
V
= 12V, V = -12V, R = 3kΩ,
DD SS L
4
C = 1000pF, T = +25°C
L A
Transmitter Propagation Delay
V
= 12V, V = -12V, R = 3kΩ,
SS L
DD
t
0.4
30
30
4.0
4.0
0.4
SKT
Skew,
t
- t
C = 1000pF, T = +25°C
L A
PLHT PHLT
|
|
V
= 12V, V = -12V,
SS
= 3kΩ to 7kΩ,
DD
C
= 150pF to
L
4
8
R
L
2500pF
Transition Output Slew Rate
SR
measured from +3V to -3V
or -3V to +3V, Figure 3,
T
A
V/µs
C
= 50pF to
L
1000pF
= +25°C
Receiver Output
Propagation Delay, Low to High
t
t
V
CC
= 5V, C = 50pF, T = +25°C
µs
µs
µs
PLHR
PHLR
L
A
Receiver Output
Propagation Delay, High to Low
V
CC
= 5V, C = 50pF, T = +25°C
L A
Receiver Propagation Delay
t
V
= 5V, C = 50pF, T = +25°C
SKR
DR
CC L A
Skew,
t
- t
PLHR PHLR
|
|
C
= 50pF to
L
V
= 5V, V = 12V,
DD
= -12V,
CC
120
2500pF
V
SS
Guaranteed Data Rate
Mouse Driveability
kbps
V
R
= 3kΩ to 7kΩ,
= +25°C
L
C
= 50pF to
L
230
T
A
1000pF
T3OUT = -5mA, T1OUT = T2OUT = +5mA
±7.5
_______________________________________________________________________________________
3
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
__________________________________________Typ ic a l Op e ra t in g Ch a ra c t e ris t ic s
(V = +5.0V, V = +12.0V, V = -12.0V, T = +25°C, unless otherwise noted.)
CC
DD
SS
A
SUPPLY CURRENT
SUPPLY CURRENT
SLEW RATE
vs. SUPPLY VOLTAGE
vs. LOAD CAPACITANCE
vs. LOAD CAPACITANCE
25
20
15
10
5
16
14
20
15
10
I
, 240kbps
DD
MAX3185
I
, 240kbps
, 120kbps
DD
I
DD
, 120kbps
I
DD
12
10
8
I
DD
, 20kbps 1 TRANSMITTER AT DATA RATE
FALL
RISE
I
DD
, 20kbps
5
0
2 TRANSMITTERS AT DATA RATE / 16
I
CC
I
1 TRANSMITTER AT DATA RATE
CC
0
I
,
SS
20kbps 2 TRANSMITTERS AT DATA RATE / 16
3kΩ + 2500pF LOAD
I
SS
, 20kbps
-5
-5
6
I
SS
, 120kbps
I
, 120kbps
-10
-15
-20
-25
SS
3kΩ + C LOAD
L
1 TRANSMITTER 240kbps
2 TRANSMITTERS 15kbps
3kΩ + C LOAD
-10
-15
-20
4
I
SS
, 240kbps
I
, 240kbps
SS
L
2
0
10.8
11.4
12.0
12.6
13.2
0
1000
2000
3000
4000 5000
0
1000
2000
3000
4000 5000
SUPPLY VOLTAGE (V)
LOAD CAPACITANCE (pF)
LOAD CAPACITANCE (pF)
SLEW RATE
vs. TEMPERATURE
TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CAPACITANCE
MAX3185 TRANSMITTER OUTPUT VOLTAGE
vs. LOAD CURRENT PER TRANSMITTER
15
25
12.5
120kbps
240kbps
10.0
7.5
10
5
20
15
VOUT+
VOUT-
5.0
1 TRANSMITTER AT DATA RATE
2 TRANSMITTERS AT DATA RATE / 16
FALL, 500pF
T1
T2
T3
2.5
V
3kΩ + C LOAD
OUT+
L
0
RISE, 500pF
0
-2.5
-5.0
-7.5
-10.0
-12.5
10
V
-5
-10
-15
CC
V
OUT-
240kbps
120kbps
RISE, 2000pF
5
0
FALL, 2000pF
-55 -35 -15
5
25 45 65 85 105 125
0
1000
2000
3000
4000 5000
0
2
4
6
8
10 12 14 16 18
TEMPERATURE (°C)
LOAD CAPACITANCE (pF)
LOAD CURRENT PER TRANSMITTER (mA)
4
_______________________________________________________________________________________
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
MAX3185
______________________________________________________________P in De s c rip t io n
PIN
NAME
FUNCTION
Supply-Voltage Input, +10.8V to +13.2V
Receiver Outputs, swing between GND and V
1
V
DD
12, 14, 17, 18, 19
R5OUT–R1OUT
T3IN, T2IN, T1IN
CC
16, 15, 13
Transmitter Inputs
10
11
V
Supply-Voltage Input, -10.8V to -13.2V
Ground. Connect system to ground.
Receiver Inputs
SS
GND
2, 3, 4, 7, 9
5, 6, 8
20
R1IN–R5IN
T1OUT, T2OUT, T3OUT Transmitter Outputs, swing between V and V
DD
SS
V
CC
Supply-Voltage Input, +4.5V to +5.5V
_______________De t a ile d De s c rip t io n
±1 5 k V ES D P ro t e c t io n
As with all Maxim devices, ESD-protection structures
are incorporated on all pins to protect against electro-
static discharges encountered during handling and
assembly. The MAX3185 driver outputs and receiver
inputs have extra protection against static electricity
found in normal operation. Maxim’s engineers devel-
oped state-of-the-art structures to protect these pins
against ESD of ±15kV, without damage. After an ESD
event, the MAX3185 continues working without latchup.
R 50M to 100M
C
R 330Ω
D
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
C
s
150pF
STORAGE
CAPACITOR
SOURCE
ESD protection can be tested in several ways. The
transmitter outputs and the receiver inputs are charac-
terized for protection to the following:
1) ±15kV using the Human Body Model
Figure 1a. IEC1000-4-2 ESD Test Model
2) ±8kV using the Contact-Discharge Method specified
in IEC1000-4-2 (formerly IEC801-2)
3) ± 15kV us ing the Air-Ga p Me thod s p e c ifie d in
IEC1000-4-2 (formerly IEC801-2)
I
100%
90%
ES D Te s t Co n d it io n s
ESD performance depends on a number of conditions.
Contact Maxim for a reliability report that documents
test setup, methodology, and results.
10%
t = 0.7ns to 1ns
r
t
30ns
60ns
Figure 1b. IEC1000-4-2 ESD-Generator Current Waveform
_______________________________________________________________________________________
5
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
Human Body Model
Figure 2a shows the Human Body Model, and Figure
2b shows the current waveform it generates when dis-
charged into a low impedance. This model consists of
a 100pF capacitor charged to the ESD voltage of inter-
est, which is then discharged into the device through a
1.5kΩ resistor.
Machine Model
The Machine Model for ESD testing uses a 200pF stor-
age capacitor and zero-discharge resistance. It mimics
the stress caused by handling during manufacturing
and assembly. Of course, all pins (not just RS-232
inputs and outputs) require this protection during man-
ufacturing. Therefore, the Machine Model is less rele-
vant to the I/O ports than are the Human Body Model
and IEC1000-4-2.
IEC1000-4-2
The IEC1000-4-2 standard covers ESD testing and per-
formance of finished equipment; it does not specifically
refer to integrated circuits. The MAX3185 helps you
design equipment that meets Level 4 (the highest level)
of IEC1000-4-2, without additional ESD-protection com-
ponents.
MAX3185
__________Ap p lic a t io n s In fo rm a t io n
Use proper layout to ensure other devices on your
board are not damaged in an ESD strike. Currents as
high as 60A can instantaneously pass into ground, so
be sure to minimize the ground-lead return path to the
power supply. A separate return path to the power sup-
ply is recommend. Trace widths should be greater than
40 mils. Bypass V , V , and V with 0.1µF capaci-
The ma in d iffe re nc e b e twe e n te s ts d one us ing the
Human Body Model and IEC1000-4-2 is higher peak
current in IEC1000-4-2. Because series resistance is
lower in the IEC1000-4-2 ESD test model (Figure 1a),
the ESD withstand voltage measured to this standard is
generally lower than that measured using the Human
Body Model. Figure 1b shows the current waveform for
the ±8kV IEC1000-4-2 Level 4 ESD Contact-Discharge
test.
CC DD
SS
tors as close to the part as possible to ensure maxi-
mum ESD protection.
Tie any unused transmitter inputs to GND or V . No
CC
external protection diodes are needed because the
MAX3185 is not sensitive to power-supply sequencing.
The Air-Gap test involves approaching the device with a
charge probe. The Contact-Discharge method connects
the probe to the device before the probe is energized.
R 1M
C
R 1500Ω
D
I 100%
P
90%
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
DISCHARGE
RESISTANCE
CHARGE-CURRENT
LIMIT RESISTOR
AMPERES
HIGH-
VOLTAGE
DC
DEVICE
UNDER
TEST
36.8%
C
100pF
STORAGE
CAPACITOR
s
10%
0
SOURCE
TIME
0
t
RL
t
DL
CURRENT WAVEFORM
Figure 2b. Human Body Model Current Waveform
Figure 2a. Human Body ESD Test Model
6
_______________________________________________________________________________________
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
MAX3185
___________________Ch ip In fo rm a t io n
TRANSISTOR COUNT: 217
3.0V
DRIVER
INPUT
1.5V
0V
T
PHL
T
PLH
V
OH
3.3V
3.0V
V
OUT
0V
-3.0V
-3.3V
t
F2
t
R2
V
OL
t
F1
t
R1
SIGNAL
GENERATOR
R
L
C
L
Figure 3. Slew-Rate Test Circuit and Timing Diagram
_______________________________________________________________________________________
7
±15kV ESD-Prote c te d, EMC-Com plia nt, 230kbps
RS-232 Se ria l Port for Mothe rboa rds /De s ktop PCs
________________________________________________________P a c k a g e In fo rm a t io n
INCHES
MILLIMETERS
DIM
MIN
0.093
MAX
0.104
0.012
0.019
0.013
0.299
MIN
2.35
0.10
0.35
0.23
7.40
MAX
2.65
0.30
0.49
0.32
7.60
D
A
A1 0.004
0°- 8°
B
C
E
e
0.014
0.009
0.291
A
0.101mm
0.004in.
MAX3185
1.27
0.050
e
B
A1
H
L
0.394
0.016
0.419
0.050
10.00
0.40
10.65
1.27
C
L
INCHES
MILLIMETERS
MAX
PINS
DIM
MIN MAX MIN
E
H
Wide SO
SMALL-OUTLINE
PACKAGE
0.398 0.413 10.10 10.50
0.447 0.463 11.35 11.75
0.496 0.512 12.60 13.00
0.598 0.614 15.20 15.60
D
D
D
D
D
16
18
20
24
28
(0.300 in.)
0.697 0.713 17.70 18.10
21-0042A
INCHES
MILLIMETERS
DIM
MIN
0.068
MAX
0.078
0.008
0.015
0.008
MIN
1.73
0.05
0.25
0.09
MAX
1.99
0.21
0.38
0.20
A
A1 0.002
B
C
D
E
e
0.010
0.004
SEE VARIATIONS
α
0.205
0.209
5.20
5.38
E
H
0.0256 BSC
0.65 BSC
H
L
0.301
0.311
0.037
8˚
7.65
0.63
0˚
7.90
0.95
8˚
0.025
0˚
C
α
L
INCHES
MILLIMETERS
DIM PINS
MIN MAX MIN
0.239 0.249 6.07
0.239 0.249 6.07
0.278 0.289 7.07
0.317 0.328 8.07
MAX
6.33
6.33
7.33
8.33
e
D
D
D
D
D
14
16
20
24
28
SSOP
SHRINK
A
SMALL-OUTLINE
PACKAGE
0.397 0.407 10.07 10.33
21-0056A
B
A1
D
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
8
___________________Ma x im In t e g ra t e d P ro d u c t s , 1 2 0 S a n Ga b rie l Drive , S u n n yva le , CA 9 4 0 8 6 (4 0 8 ) 7 3 7 -7 6 0 0
© 1996 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.
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MAXIM
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