19-1479; Rev 1; 7/99
±15kV ESD-Protected, 0.5µA, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
General Description
The MAX3180E–MAX3183E 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 0.5µA 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.
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
0.5µA 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)
Features
MAX3180E–MAX3183E
Applications
Diagnostic Ports
Telecommunications
Networking Equipment
Set-Top Boxes
Digital Cameras
Hand-Held Equipment
PART
Ordering Information
TEMP. RANGE
PIN-
PACKAGE
5 SOT23-5
5 SOT23-5
5 SOT23-5
5 SOT23-5
TOP
MARK
ACHB
ACHC
ACHD
ACHE
MAX3180EEUK-T
-40°C to +85°C
MAX3181EEUK-T
-40°C to +85°C
MAX3182EEUK-T
-40°C to +85°C
MAX3183EEUK-T
-40°C to +85°C
Pin Configurations/Functional Diagrams appear at end of
data sheet.
Selector Guide
PART
MAX3180E
MAX3181E
MAX3182E
MAX3183E
ESD
PROTECTION
(kV)
±15
±15
±15
±15
PACKAGE
SOT23-5
SOT23-5
SOT23-5
SOT23-5
SUPPLY
CURRENT
(µA)
0.5
0.5
0.5
0.5
EN
INPUT
—
—
INVALID
OUTPUT
—
—
INVERTING
ROUT
—
—
NON-
INVERTING
ROUT
—
—
________________________________________________________________
Maxim Integrated Products
1
For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800.
For small orders, phone 1-800-835-8769.
±15kV ESD-Protected, 0.5µA, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
MAX3180E–MAX3183E
ABSOLUTE MAXIMUM RATINGS
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
= +70°C)
SOT23-5 (derate 7.1mW/°C above +70°C)...................571mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Lead Temperature (soldering, 10sec) .............................+300°C
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
= +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
= +25°C.) (Note 1)
PARAMETER
DC CHARACTERISTICS
Supply Voltage
Supply Current
LOGIC INPUT (EN)
Logic Threshold Low
Logic Threshold High
Leakage Current
LOGIC OUTPUT
INVALID
Output Voltage Low
INVALID
Output Voltage High
RECEIVER INPUT
Input Voltage Range
Input Threshold Low
Input Threshold High
Input Hysteresis
RIN Threshold to
INVALID
Output High
RIN Threshold to
INVALID
Output Low
Input Resistance
RECEIVER OUTPUT
Output Leakage Current
Output Voltage Low
Output Voltage High
I
ROUT
V
OL
V
OH
Receiver disabled
I
SINK
= 1.6mA
I
SOURCE
= 1.0mA
V
CC
-
0.6
V
CC
-
0.1
±0.05
±10
0.4
µA
V
V
V
RIN
V
ITL
V
ITH
V
HYST
V
ITOH
V
ITOL
R
RIN
Positive threshold
Negative threshold
-2.7
-0.3
3
5
0.3
7
V
CC
= 3.3V
V
CC
= 5.0V
V
CC
= 3.3V
V
CC
= 5.0V
-25
0.6
0.8
1.2
1.5
1.5
1.8
300
2.7
2.4
2.7
25
V
V
V
mV
V
V
kΩ
V
IOL
V
IOH
I
SINK
= 1.6mA
I
SOURCE
= 1.0mA
V
CC
-
0.6
0.4
V
V
V
IL
V
IH
I
EN
V
CC
= 3.3V
V
CC
= 5.0V
2.0
2.4
±0.01
±1.0
0.8
V
V
µA
V
CC
I
CC
V
CC
= 3.3V or 5V, RIN = V
CC
or GND
,
no load
3.0
0.5
5.5
5.0
V
µA
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
2
_______________________________________________________________________________________
±15kV ESD-Protected, 0.5µA, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
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
= +25°C.) (Note 1)
PARAMETER
TIMING CHARACTERISTICS
Maximum Data Rate
Receiver Propagation Delay,
High-to-Low
Receiver Propagation Delay,
Low-to-High
Receiver Skew
Receiver Output Enable Time
Receiver Output Disable Time
Receiver Positive or Negative
Threshold to
INVALID
High
Receiver Positive or Negative
Threshold to
INVALID
Low
t
PHL
t
PLH
t
RS
t
ROE
t
ROD
t
INVH
t
INVL
C
L
= 50pF
RIN to ROUT; C
L
= 150pF
RIN to ROUT; C
L
= 150pF
1.5
0.15
0.15
50
200
200
250
30
Mbps
µs
µs
ns
ns
ns
ns
µs
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
MAX3180E–MAX3183E
|
t
PHL
- t
PLH
|
, Figure 1
Note 1:
Specifications are 100% tested at T
A
= +25°C. Limits over temperature are guaranteed by design.
Typical Operating Characteristics
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
SUPPLY CURRENT vs. DATA RATE
R
L
= 50kΩ
C
L
= 100pF
MAX3180E-01
RIN TO INVALID HIGH
vs. SUPPLY VOLTAGE
MAX3180E-02
0.7
0.6
SUPPLY CURRENT (mA)
0.5
0.4
0.3
V
CC
= 3.3V
0.2
0.1
0
0
0.5
1.0
350
330
310
t
INVH
(ns)
V
CC
= 5V
290
270
250
230
1.5
3.0
3.5
4.0
4.5
5.0
5.5
DATA RATE (Mbps)
V
CC
(V)
_______________________________________________________________________________________
3
±15kV ESD-Protected, 0.5µA, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
MAX3180E–MAX3183E
Typical Operating Characteristics (continued)
(V
CC
= +5V, T
A
= +25°C, unless otherwise noted.)
MAX3180E
ENABLE ASSERTION TO ROUT RESPONSE
MAX3180E-03
RIN TO INVALID LOW vs. V
CC
60
55
50
t
INVL
(µs)
45
40
35
30
25
3.0
3.5
4.0
4.5
5.0
5.5
ENABLE
0
10V
RIN
0
-10V
5V
ROUT
0
5V
V
CC
= 5.0V
R
L
= 50kΩ
C
L
= 100pF
500ns/div
V
CC
(V)
Pin Description
NAME
PIN
MAX3180E
EN
1
–
2
3
–
4
5
RIN
V
CC
–
RIN
V
CC
ROUT
RIN
V
CC
ROUT
RIN
V
CC
Noninverting Receiver Output
Receiver Input
Supply Voltage
GND
ROUT
MAX3181E
–
INVALID
GND
ROUT
MAX3182E
EN
–
GND
–
MAX3183E
–
INVALID
GND
–
Receiver Output Enable
Output of the Valid Input Detector
Ground
Inverting Receiver Output
FUNCTION
Detailed Description
5V
RIN
50%
0
t
PLH
V
OH
ROUT
V
OL
50%
50%
t
PHL
50%
Figure 1. Receiver Propagation-Delay Timing
4
The MAX3180E–MAX3183E 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 0.5µA. 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.
_______________________________________________________________________________________
MAX3180E-04
±15kV ESD-Protected, 0.5µA, +3V to +5.5V,
1.5Mbps RS-232 Receivers in SOT23-5
MAX3180E–MAX3183E
VALID SIGNALS
RECEIVER INPUT LEVELS
+2.7V
INDETERMINATE
+0.3V
0
-0.3V
INDETERMINATE
-2.7V
VALID SIGNALS
RECEIVER
INPUT
VOLTAGE
(V)
INVALID
REGION
INVALID SIGNALS
V
CC
INVALID
OUTPUT
(V)
0
t
INVL
t
INVH
Figure 2. Input Levels and
INVALID
Timing
Signal Invalid Detector
If no valid signal levels appear on RIN for 30µs (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.
R
C
1MΩ
CHARGE-CURRENT
LIMIT RESISTOR
HIGH-
VOLTAGE
DC
SOURCE
R
D
1500Ω
DISCHARGE
RESISTANCE
DEVICE
UNDER
TEST
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.
Cs
100pF
STORAGE
CAPACITOR
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 MAX3180E–MAX3183E 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
Figure 3. Human Body ESD Test Model
I
P
100%
90%
AMPERES
36.8%
10%
0
0
t
RI
TIME
Ir
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
t
DL
CURRENT WAVEFORM
Figure 4. Human Body Model Current Waveform
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
1.5kΩ resistor.
_______________________________________________________________________________________
5
嵌入式系统
