19-1604; Rev 1; 3/00
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
General Description
The MAX3188E/MAX3189E single RS-232 transmitters
in a SOT23-6 package are for space- and cost-con-
strained applications requiring minimal RS-232 commu-
nications. These devices consume only 150µA of
supply current from ±4.5V to ±6V supplies. They fea-
ture a shutdown input that reduces current consump-
tion to only 1µA and forces the transmitter output into a
high-impedance state. RS-232 data transmission is guar-
anteed up to 250kbps with the MAX3188E and up to
1Mbps with the MAX3189E.
The MAX3188E/MAX3189E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232-compliant
signals. The transmitter output is protected to ±15kV
using the IEC 1000-4-2 Air-Gap Discharge method, to
±8kV using the IEC 1000-4-2 Contact Discharge
method, and to ±15kV per the Human Body Model,
ensuring strict compliance with international standards.
The MAX3188E/MAX3189E transmitters have a standard
inverting output.
o
Small 6-Pin SOT23 Package
o
ESD-Protected RS-232 Output
±15kV per Human Body Model
±8kV per IEC 1000-4-2, Contact Discharge
±15kV per IEC 1000-4-2, Air-Gap Discharge
o
150µA Operating Supply Current
o
Shutdown Reduces Supply Current to 1µA
o
Guaranteed Data Rate
1Mbps (MAX3189E)
250kbps (MAX3188E)
o
Three-State RS-232 Transmitter Output
o
No External Components
Features
MAX3188E/MAX3189E
Applications
Diagnostic Ports
Telecommunications
Networking Equipment
Set-Top Boxes
Digital Cameras
Hand-Held Equipment
PART
MAX3188EEUT-T
MAX3189EEUT-T
Ordering Information
TEMP. RANGE
-40°C to +85°C
-40°C to +85°C
PIN-
PACKAGE
6 SOT23-6
6 SOT23-6
TOP
MARK
AAHD
AAHE
Typical Operating Circuit
TOP VIEW
1
+5.4V
C
BYPASS1
0.1µF
6
SHDN
V
CC
MAX3188E
MAX3189E
3 TIN
GND
2
CAPACITORS MAY BE
POLARIZED OR UNPOLARIZED.
TOUT 4
V
EE
5
-5.4V
C
BYPASS2
0.1µF
SHDN
1
Pin Configuration
6
V
CC
GND
2
MAX3188E
MAX3189E
5
VEE
TIN
3
4
TOUT
SOT23-6
________________________________________________________________
Maxim Integrated Products
1
For price, delivery, and to place orders, please contact Maxim Distribution at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
MAX3188E/MAX3189E
ABSOLUTE MAXIMUM RATINGS
V
CC
to GND (Note 1) ................................................-0.3V to +7V
V
EE
to GND (Note 1).................................................+0.3V to -7V
V
CC
to V
EE
(Note 1) .............................................................+13V
TIN,
SHDN
to GND ...................................................-0.3V to +7V
TOUT to GND (SHDN = GND)..........................................±13.2V
TOUT to GND (SHDN = V
CC
) ................................................±7V
Output Short-Circuit Duration.....................................Continuous
Continuous Power Dissipation (T
A
= +70°C)
6-Pin SOT23 (derate 8.7mW/°C above +70°C)..........691mW
Operating Temperature Range ...........................-40°C to +85°C
Junction Temperature ......................................................+150°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10s) .................................+300°C
Note 1:
V
CC
and V
EE
can have maximum magnitudes of 7V, but their absolute difference cannot exceed 13V.
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
CC
= +4.5V to +6V, V
EE
= -4.5V to -6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5.4V, V
EE
= -5.4V,
and T
A
= +25°C.) (Note 2)
PARAMETER
DC CHARACTERISTICS
Positive Supply Voltage
Negative Supply Voltage
Positive Supply Current
Negative Supply Current
Shutdown Supply Current
INPUT LOGIC (TIN, SHDN)
Input Logic Threshold Low
Input Logic Threshold High
Input Leakage
TIN Input Hysteresis
TRANSMITTER OUTPUTS
Output Voltage Swing
Output Resistance
Output Short-Circuit Current
Output Leakage Current
TIMING CHARACTERISTICS
Maximum Data Rate
Transmitter Skew
t
TS
R
L
= 3kΩ,
C
L
= 1000pF
|t
PHL
- t
PLH
|,
Figure 1
MAX3188E
MAX3189E
MAX3188E
MAX3189E
6
0.25
1
100
25
30
V/µs
24
2
150
µs
Mbps
ns
I
TOUT
V
OUT
= ±12V; V
CC
= V
EE
= 0 or V
CC
= 5.4V,
V
EE
= -5.4V;
SHDN
= 0
V
TOUT
R
TOUT
V
CC
= 4.5V, V
EE
= -4.5V, R
L
= 3kΩ
V
CC
= 5.4V, V
EE
= -5.4V, R
L
= 3kΩ
V
CC
= V
EE
= 0, V
TOUT
= ±2V
±3.7
±5
300
±35
±60
±25
V
Ω
mA
µA
V
IL
V
IH
2.0
±0.01
100
±1
0.8
V
V
µA
mV
V
CC
V
EE
I
CC
I
EE
V
SHDN
= 5V
V
SHDN
= 5V
V
SHDN
= 0
45
0.2
1
4.5
-6
6
-4.5
170
V
V
µA
µA
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Transition-Region Slew Rate
R
L
= 3kΩ to 7kΩ,
C
L
= 150pF to 1000pF, MAX3188E
measured from -3V
to +3V or +3V to -3V,
V
CC
= 5.4V, V
EE
=
MAX3189E
-5.4V, T
A
= +25°C
t
EN
Transmitter Enable Time
2
_______________________________________________________________________________________
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +4.5V to +6V, V
EE
= -4.5V to -6V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5.4V, V
EE
= -5.4V,
and T
A
= +25°C.) (Note 2)
PARAMETER
ESD PROTECTION
IEC 1000-4-2 Air-Gap Discharge
TOUT
IEC 1000-4-2 Contact Discharge
Human Body Model
Note 2:
All devices are 100% tested at T
A
= +25°C. All limits over temperature are guaranteed by design.
±15
±8
±15
kV
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3188E/MAX3189E
Typical Operating Characteristics
(V
CC
= +5.4V, V
EE
= -5.4V, R
L
= 3kΩ, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. DATA RATE
(C
L
= 150pF)
MAX3188E/9E toc01
SUPPLY CURRENT vs. DATA RATE
(C
L
= 1000pF)
MAX3188E/9E toc02
MAX3188E
SUPPLY CURRENT
vs. OUTPUT CAPACITANCE
3.5
SUPPLY CURRENT (mA)
3.0
2.5
2.0
1.5
1.0
0.5
0
0
500
1000
1500
2000
2500
40kbps
120kbps
250kbps
MAX3188E/9E toc03
2.5
I
CC
(MAX3189E)
7
6
SUPPLY CURRENT (mA)
5
4
3
2
MAX3188E
1
MAX3189E
4.0
2.0
SUPPLY CURRENT (mA)
I
CC
(MAX3188E)
1.5
I
EE
(MAX3189E)
1.0
I
EE
(MAX3188E)
0.5
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DATA RATE (Mbps)
0
0
0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1.0
DATA RATE (Mbps)
OUTPUT CAPACITANCE (pF)
MAX3189E
SUPPLY CURRENT
vs. OUTPUT CAPACITANCE
MAX3188E/9E toc04
MAX3188E
SLEW RATE vs. OUTPUT CAPACITANCE
MAX3188E/9E toc05
MAX3189E
SLEW RATE vs. OUTPUT CAPACITANCE
80
70
SLEW RATE (V/µs)
60
50
40
30
20
+SLEW
-SLEW
MAX3188E/9E toc06
14
12
SUPPLY CURRENT (mA)
1Mbps
10
8
6
240kbps
4
2
0
0
500
1000
1500
2000
40kbps
500kbps
14
12
SLEW RATE (V/µs)
10
8
6
4
2
0
-SLEW
90
+SLEW
10
0
0
500
1000
1500
2000
2500
0
500
1000
1500
2000
2500
OUTPUT CAPACITANCE (pF)
OUTPUT CAPACITANCE (pF)
2500
OUTPUT CAPACITANCE (pF)
_______________________________________________________________________________________
3
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
MAX3188E/MAX3189E
Typical Operating Characteristics (continued)
(V
CC
= +5.4V, V
EE
= -5.4V, R
L
= 3kΩ, T
A
= +25°C, unless otherwise noted.)
MAX3188E
TRANSMITTER OUTPUT
SHUTDOWN WAVEFORM
MAX3188E/9E toc07
MAX3189E
TRANSMITTER OUTPUT
SHUTDOWN WAVEFORM
MAX3188E/9E toc08
C
L
= 150pF
SHDN
+2V
0
+5V
SHDN
C
L
= 150pF
+2V
0
+5V
TOUT
0
TOUT
0
-5V
1µs/div
-5V
1µs/div
Pin Description
PIN
1
2
3
4
5
6
NAME
SHDN
GND
TIN
TOUT
V
EE
V
CC
FUNCTION
Active-Low Shutdown. Pull low to
reduce the supply current and to force
TOUT into a high-impedance state.
Ground
TTL/CMOS Transmitter Input
RS-232 Transmitter Output
Negative Supply Voltage
Positive Supply Voltage
Figure 1. Transmitter Propagation-Delay Timing
TIN
V
IL
V
IH
50%
50%
+5V
TOUT
-5V
t
PLH
t
PHL
50%
50%
Detailed Description
The MAX3188E/MAX3189E are EIA/TIA-232 transmitters
that convert CMOS/TTL logic levels to RS-232 signals.
They operate on ±4.5V to ±6V supplies and feature
enhanced electrostatic discharge protection (see
ESD
Protection).
The MAX3188E guarantees a 250kbps data
rate, and the MAX3189E guarantees a 1Mbps data rate
with worst-case loads of 3kΩ in parallel with 1000pF.
The MAX3188E/MAX3189E invert the TOUT signal relative
to TIN (standard RS-232). The transmitter input does
not have a pull-up resistor and should be connected to
GND if unused.
Shutdown
The MAX3188E/MAX3189E feature a shutdown input.
Drive
SHDN
low to reduce the supply current to 1µA
(max). Shutdown also forces TOUT into a high-imped-
ance state, allowing the signal line to be safely con-
trolled by other transmitters. Drive
SHDN
high for
normal operation.
ESD Protection
As with all Maxim devices, ESD protection structures are
incorporated on all pins to protect against ESD encoun-
tered during handling and assembly. The MAX3188E/
MAX3189Es’ transmitter output has extra protection
against static electricity. Maxim has developed state-of-
the-art structures enabling this pin to withstand ESD up
4
_______________________________________________________________________________________
±15kV ESD-Protected, 1Mbps, 1µA
RS-232 Transmitters in SOT23-6
to ±15kV without damage or latch-up. The MAX3188E/
MAX3189E’s transmitter output is characterized for pro-
tection to the following limits:
• ±15kV using the Human Body Model
• ±8kV using the Contact Discharge method specified
in IEC 1000-4-2
• ±15kV using the Air-Gap Discharge method specified
in IEC 1000-4-2
HIGH-
VOLTAGE
DC
SOURCE
MAX3188E/MAX3189E
R
C
1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
R
D
1500Ω
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
Cs
100pF
STORAGE
CAPACITOR
Human Body Model
Figure 2 shows the Human Body Model, and Figure 3
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 interest,
and then discharged into the test device through a
1.5kΩ resistor.
Figure 2. Human Body ESD Test Model
IEC 1000-4-2
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment; it does not specifi-
cally refer to ICs. The MAX3188E/MAX3189E enable
the design of equipment that meets the highest level
(Level 4) of IEC 1000-4-2 without the need for additional
ESD-protection components. The major difference
between tests done using the Human Body Model and
IEC 1000-4-2 is higher peak current in IEC 1000-4-2.
Because series resistance is lower in the IEC 1000-4-2
model, the ESD withstand voltage measured to this
standard is generally lower than that measured using
the Human Body. Figure 4 shows the IEC 1000-4-2
model, and Figure 5 shows the current waveform for
the ±8kV IEC 1000-4-2 Level 4 ESD Contact Discharge
test. The Air-Gap test involves approaching the device
with a charged probe. The Contact Discharge method
connects the probe to the device before the probe is
energized.
I
P
100%
90%
AMPERES
36.8%
10%
0
0
t
RI
TIME
t
DL
CURRENT WAVEFORM
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Figure 3. Human Body Model Current Waveform
Power-Supply Decoupling
In most circumstances, 0.1µF bypass capacitors are
adequate for power-supply decoupling. Connect the
bypass capacitors as close to the IC as possible.
HIGH-
VOLTAGE
DC
SOURCE
R
C
50MΩ TO 100MΩ
CHARGE-CURRENT
LIMIT RESISTOR
R
D
330Ω
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
Cs
150pF
STORAGE
CAPACITOR
Figure 4. IEC 1000-4-2 ESD Test Model
_______________________________________________________________________________________
5
嵌入式系统
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
