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General Description
The MAX3180EMAX3183E single RS-232 receivers in
a SOT23-5 package are designed for space- and cost-
constrained applications requiring minimal RS-232
communications. The receiver inputs are protected to
15kV using IEC 1000-4-2 Air-Gap Discharge, to 8kV
using IEC 1000-4-2 Contact Discharge, and to 15kV
per the Human Body Model, ensuring compliance with
international standards.
The devices minimize power and heat dissipation by
consuming only 0.5A supply current from a +3.0V to
+5.5V supply, and they guarantee true RS-232 perfor-
mance up to a 1.5Mbps data rate. The MAX3180E/
MAX3182E feature a three-state TTL/CMOS receiver
output that is controlled by an EN logic input. The
MAX3181E/MAX3183E feature an INVALID output that
indicates valid RS-232 signals at the receiver input for
applications requiring automatic system wake-up. The
MAX3182E/MAX3183E have a noninverting output,
while the MAX3180E/MAX3181E have a standard
inverting output.
Applications
Diagnostic Ports
Telecommunications
Networking Equipment
Set-Top Boxes
Digital Cameras
Hand-Held Equipment
Features
o
Tiny SOT23-5 Package
o
ESD-Protected RS-232 Input
15kV--Human Body Model
8kV--IEC 1000-4-2, Contact Discharge
15kV--IEC 1000-4-2, Air-Gap Discharge
o
0.5A Supply Current
o
1.5Mbps Guaranteed Data Rate
o
Meets EIA/TIA-232 and V.28/V.24 Specifications
Down to V
CC
= +3.0V
o
INVALID
Output Indicates Valid RS-232 Signal at
Receiver Input (MAX3181E/MAX3183E)
o
Three-State TTL/CMOS Receiver Output
(MAX3180E/MAX3182E)
o
Noninverting RS-232 Output
(MAX3182E/MAX3183E)
MAX3180EMAX3183E
15kV ESD-Protected, 0.5A, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
________________________________________________________________
Maxim Integrated Products
1
19-1479; Rev 1; 7/99
PART
MAX3180E
EUK-T -40C to +85C
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
Pin Configurations/Functional Diagrams appear at end of
data sheet.
Selector Guide
Ordering Information
TOP
MARK
ACHB
MAX3181E
EUK-T -40C to +85C
5 SOT23-5
ACHC
MAX3182E
EUK-T -40C to +85C
5 SOT23-5
ACHD
MAX3183E
EUK-T -40C to +85C
5 SOT23-5
ACHE
ESD
PROTECTION
(kV)
MAX3180E
15
PART
PACKAGE
SOT23-5
SUPPLY
CURRENT
(A)
0.5
EN
INPUT
INVALID
OUTPUT
--
INVERTING
ROUT
NON-
INVERTING
ROUT
--
MAX3181E
15
SOT23-5
0.5
--
--
MAX3182E
15
SOT23-5
0.5
--
--
MAX3183E
15
SOT23-5
0.5
--
--
MAX3180EMAX3183E
15kV ESD-Protected, 0.5A, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
2
_______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
ELECTRICAL CHARACTERISTICS
(V
CC
= +3.0V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5.0V, T
A
= +25C.) (Note 1)
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.
V
CC
to GND ..............................................................-0.3V to +6V
RIN to GND ..........................................................................25V
EN, ROUT, INVALID to GND ......................-0.3V to (V
CC
+ 0.3V)
Continuous Power Dissipation (T
A
= +70C)
SOT23-5 (derate 7.1mW/C above +70C)...................571mW
Operating Temperature Range ...........................-40C to +85C
Storage Temperature Range .............................-65C to +150C
Lead Temperature (soldering, 10sec) .............................+300C
V
CC
= 3.3V or 5V, RIN = V
CC
or GND
,
no load
Negative threshold
Positive threshold
V
CC
= 5.0V
V
CC
= 3.3V
I
SINK
= 1.6mA
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 3.3V
V
CC
= 5.0V
CONDITIONS
k
3
5
7
R
RIN
Input Resistance
V
-0.3
0.3
V
ITOL
RIN Threshold to INVALID
Output Low
V
-2.7
V
ITOH
2.7
RIN Threshold to INVALID
Output High
mV
300
V
HYST
Input Hysteresis
V
1.8
2.7
V
ITH
Input Threshold High
1.5
2.4
V
0.8
1.5
V
ITL
Input Threshold Low
0.6
1.2
V
-25
25
V
RIN
Input Voltage Range
A
0.5
5.0
I
CC
Supply Current
V
3.0
5.5
V
CC
Supply Voltage
V
0.4
V
IOL
INVALID Output Voltage Low
A
0.01
1.0
I
EN
Leakage Current
V
0.8
V
IL
Logic Threshold Low
2.0
V
2.4
V
IH
Logic Threshold High
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
I
SINK
= 1.6mA
Receiver disabled
V
0.4
V
OL
Output Voltage Low
A
0.05
10
I
ROUT
Output Leakage Current
I
SOURCE
= 1.0mA
V
V
CC
- V
CC
-
0.6
0.1
V
OH
Output Voltage High
I
SOURCE
= 1.0mA
V
V
CC
-
0.6
V
IOH
INVALID Output Voltage High
DC CHARACTERISTICS
LOGIC INPUT (
EN
)
LOGIC OUTPUT
RECEIVER INPUT
RECEIVER OUTPUT
MAX3180EMAX3183E
15kV ESD-Protected, 0.5A, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
_______________________________________________________________________________________
3
ELECTRICAL CHARACTERISTICS (continued)
(V
CC
= +3.0V to +5.5V, T
A
= T
MIN
to T
MAX
, unless otherwise noted. Typical values are at V
CC
= +5.0V, T
A
= +25C.) (Note 1)
CONDITIONS
|
t
PHL
- t
PLH
|
, Figure 1
UNITS
MIN
TYP
MAX
SYMBOL
PARAMETER
C
L
= 50pF
ns
200
t
ROE
Receiver Output Enable Time
ns
50
t
RS
Receiver Skew
Mbps
1.5
Maximum Data Rate
ns
250
t
INVH
Receiver Positive or Negative
Threshold to INVALID High
ns
200
t
ROD
Receiver Output Disable Time
RIN to ROUT; C
L
= 150pF
s
0.15
t
PHL
Receiver Propagation Delay,
High-to-Low
RIN to ROUT; C
L
= 150pF
s
0.15
t
PLH
Receiver Propagation Delay,
Low-to-High
s
30
t
INVL
Receiver Positive or Negative
Threshold to INVALID Low
Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25C, unless otherwise noted.)
0
0.2
0.1
0.4
0.3
0.6
0.5
0.7
0
0.5
1.0
1.5
SUPPLY CURRENT vs. DATA RATE
MAX3180E-01
DATA RATE (Mbps)
SUPPLY CURRENT (mA)
R
L
= 50k
C
L
= 100pF
V
CC
= 5V
V
CC
= 3.3V
230
270
250
290
330
310
350
3.0
3.5
5.0
4.5
4.0
5.5
RIN TO INVALID HIGH
vs. SUPPLY VOLTAGE
MAX3180E-02
V
CC
(V)
t
INVH
(ns)
TIMING CHARACTERISTICS
Note 1:
Specifications are 100% tested at T
A
= +25C. Limits over temperature are guaranteed by design.
Detailed Description
The MAX3180EMAX3183E are EIA/TIA-232 and V.28/
V.24 communications receivers that convert RS-232
signals to CMOS logic levels. They operate on a +3V to
+5.5V supply, have 1.5Mbps data rate capability, and
feature enhanced electrostatic discharge (ESD) protec-
tion (see
ESD Protection). All of these devices achieve
a typical supply current of 0.5A. The MAX3180E/
MAX3182E have a receiver enable control (EN). The
MAX3181E/MAX3183E contain a signal invalid output
(INVALID). The MAX3180E/MAX3181E invert the ROUT
signal relative to RIN (standard RS-232). The
MAX3182E/MAX3183E outputs are not inverted. The
devices come in tiny SOT23-5 packages.
MAX3180EMAX3183E
15kV ESD-Protected, 0.5A, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
4
_______________________________________________________________________________________
25
35
30
45
40
55
50
60
3.0
3.5
4.0
4.5
5.0
5.5
RIN TO INVALID LOW vs. V
CC
MAX3180E-03
V
CC
(V)
t
INVL
(
s)
50%
50%
50%
0
RIN
5V
ROUT
50%
t
PLH
t
PHL
V
OH
V
OL
Typical Operating Characteristics (continued)
(V
CC
= +5V, T
A
= +25C, unless otherwise noted.)
5V
0
10V
0
-10V
RIN
ROUT
ENABLE
5V
0
500ns/div
MAX3180E
ENABLE ASSERTION TO ROUT RESPONSE
MAX3180E-04
V
CC
= 5.0V
R
L
= 50k
C
L
= 100pF
1
EN
Receiver Output Enable
Pin Description
NAME
EN
MAX3180E
FUNCTION
MAX3182E
PIN
Output of the Valid Input Detector
2
GND
Ground
GND
3
ROUT
Inverting Receiver Output
4
RIN
Receiver Input
RIN
5
V
CC
Supply Voltage
V
CC
Figure 1. Receiver Propagation-Delay Timing
Noninverting Receiver Output
ROUT
MAX3181E
MAX3183E
INVALID
GND
ROUT
RIN
V
CC
INVALID
GND
ROUT
RIN
V
CC
Signal Invalid Detector
If no valid signal levels appear on RIN for 30s (typ),
INVALID goes low. This event typically occurs if the
RS-232 cable is disconnected, or if the connected
peripheral transmitter is turned off. INVALID goes high
when a valid level is applied to the RS-232 receiver
input. Figure 2 shows the input levels and timing dia-
gram for INVALID operation.
Enable Input
The MAX3180E/MAX3182E feature an enable input
(EN). Drive EN high to force ROUT into a high-imped-
ance state. In this state, the devices ignore incoming
RS-232 signals. Pull EN low for normal operation.
ESD Protection
As with all Maxim devices, ESD protection structures
are incorporated on all pins to protect against ESD
encountered during handling and assembly. The
receiver inputs of the MAX3180EMAX3183E have extra
protection against static electricity. Maxim's engineers
have developed state-of-the-art structures enabling
these pins to withstand ESD up to 15kV without dam-
age or latchup. The receiver inputs of the MAX3180E
MAX3183E are characterized for protection to the fol-
lowing 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 speci-
fied in IEC 1000-4-2
Human Body Model
Figure 3 shows the Human Body Model, and Figure 4
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, and then discharged into the test device through a
1.5k
resistor.
MAX3180EMAX3183E
15kV ESD-Protected, 0.5A, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
_______________________________________________________________________________________
5
CHARGE-CURRENT
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
R
C
1M
R
D
1500
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 3. Human Body ESD Test Model
I
P
100%
90%
36.8%
t
RI
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPERES
Figure 4. Human Body Model Current Waveform
VALID SIGNALS
INVALID SIGNALS
VALID SIGNALS
RECEIVER INPUT LEVELS
-2.7V
-0.3V
+2.7V
+0.3V
0
INDETERMINATE
INDETERMINATE
0
V
CC
t
INVL
INVALID
REGION
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
OUTPUT
(V)
t
INVH
Figure 2. Input Levels and INVALID Timing
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