General Description
The MAX13181E–MAX13184E are full-duplex and selec-
table half-/full-duplex RS-485 transceivers in a tiny 2mm x
2mm µDFN package. These devices are designed for
space-constrained applications by including extended
ESD protection to ±15kV per Human Body Model (HBM)
and integrating pullup/pulldown resistors on the DE, RE
and H/Finputs to reduce external components. The
MAX13182E/MAX13184E feature a low-current shutdown
mode for power-sensitive applications.
These devices have a 1/8 unit-load input receiver
that allows up to 256 transceivers on the bus. The
MAX13181E/MAX13182E feature reduced slew-rate
drivers to minimize EMI and reflections that are caused
by improperly terminated cables. The slew-rate limited
MAX13181E/MAX13182E allow error-free data transmis-
sion up to 250kbps. The MAX13183E/MAX13184E feature
full-speed drivers, allowing data rates of up to 16Mbps.
The MAX13182E/MAX13184E are configured for full-
duplex operation, while the MAX13181E/MAX13183E
feature pin-selectable half- or full-duplex operation. All
driver outputs and receiver inputs include extended
ESD protection.
The MAX13181E–MAX13184E are available in a tiny 10-
pin, 2mm x 2mm µDFN. The MAX13183E/MAX13184E are
also available in industry-standard 14-pin SO packages.
The devices operate over the extended -40°C to +85°C
temperature range.
Applications
Features
oAvailable in Tiny, 10-Pin, 2mm x 2mm, µDFN and
14-Pin SO Packages
o+5.0V Operation
oExtended ESD Protection
±15kV Human Body Model
±12kV IEC 61000-4-2 Air-Gap Disharge
±6kV IEC 61000-4-2 Contact Disharge
oSlew-Rate Limiting Facilitates Error-Free Data
Transmission (MAX13181E/MAX13182E)
o2.5µA (typ) Low-Current Shutdown Mode
o1/8-Unit Load Allows Up to 256 Transceivers on
the Bus
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
________________________________________________________________
Maxim Integrated Products
1
19-0879; Rev 0; 7/07
For pricing delivery, and ordering information please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.
Ordering Information
+
Denotes a lead-free package.
PART TEMP RANGE PIN-PACKAGE TOP MARK PKG CODE
MAX13181EELB+ -40°C to +85°C 10 µDFN ABC L1022-1
MAX13182EELB+ -40°C to +85°C 10 µDFN ABD L1022-1
MAX13182EESD+ -40°C to +85°C 14 SO — S14-1
Industrial Control
Motor Drive Control
Telecom
Security System
Instrumentation
Selector Guide
PART HALF/FULL
DUPLEX
MAXIMUM DATA
RATE
SLEW-RATE
LIMITED
LOW-POWER
SHUTDOWN
RECEIVER
ENABLE
MAX13181E Selectable 250 kbps Yes No No
MAX13182E Full 250 kbps Yes Yes Yes
MAX13183E Selectable 16 Mbps No No No
MAX13184E Full 16 Mbps No Yes Yes
Ordering Information continued at end of data sheet.
Pin Configurations
MAX13182E
MAX13184E
10
1
9
2
8
3
7
4
6
5
VCC RO RE DE DI
A
TOP VIEW
BZ
µDFN
+
+
Y GND
MAX13181E
MAX13183E
10
1
9
2
8
3
7
4
6
5
VCC RO H/F DE DI
ABZ
µDFN
Y GND
Pin Configurations continued at end of data sheet.
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
2 _______________________________________________________________________________________
ABSOLUTE MAXIMUM RATINGS
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±10%, TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA= +25°C.) (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.
(All voltages referenced to GND.)
Supply Voltage (VCC) ...............................................-0.3V to +6V
Control Voltage (RE, DE, DI, H/F).............................-0.3V to +6V
Driver Output Voltage (A, B, Y, Z) ..........................-8V to +12.5V
Receiver Input Voltage (A, B).................................-8V to +12.5V
Receiver Input Voltage Full-Duplex (A, B)..............-8V to +12.5V
Receiver Output Voltage (RO)................... -0.3V to (VCC + 0.3V)
Short-Circuit Duration (A, B, Y, Z) to GND .................Continuous
Continuous Power Dissipation (TA= +70°C)
10-Pin µDFN (derate 5mW/°C above +70°C ) .............403mW
14-Pin SO (derate 8.3mW/°C above +70°C )...............667mW
Operating Temperature Range ...........................-40°C to +85°C
Storage Temperature Range .............................-65°C to +150°C
Junction Temperature......................................................+150°C
Lead Temperature (soldering, 10s) .................................+300°C
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
DRIVER
RL = 100Ω (RS422), Figure 1 2 VCC V
RL = 54Ω (RS485), Figure 1 1.5 VCC
Differential Driver Output VOD
No load VCC
V
Change in Magnitude of Differential
Output Voltage ΔVOD RL = 100Ω or 54Ω, Figure 1, (Note 2) 0.2 V
Driver Common-Mode Output Voltage VOC RL = 100Ω or 54Ω, Figure 1 VCC / 2 3 V
Change in Magnitude
of Common-Mode Voltage ΔVOC RL = 100Ω or 54Ω, Figure 1, (Note 2) 0.2 V
Input-High Voltage VIH DE, DI, RE, H/F2V
Input-Low Voltage VIL DE, DI, RE, H/F0.8 V
Input Hysteresis VHYS DE, DI, RE, H/F100 mV
Internal Pullup Resistance RIN_UP Internal pullup RE 125 400 kΩ
Internal Pulldown Resistance RIN_DWN Internal pulldown DE, H/F125 400 kΩ
VIN = +12V 125
Output Leakage (Y and Z)
Full-Duplex IODE = GND, VCC = GND or
5.5V VIN = -7V -100 µA
0 ≤ VOUT ≤ 12V 40 250
Driver Short-Circuit Output Current
Threshold (Note 3) IOSD -7 ≤ VOUT ≤ VCC -250 -40 mA
(VCC - 1V) ≤ VOUT ≤ 12V 20
Driver Short-Circuit Foldback Output
Current (Note 3) IOSDF -7V ≤ VOUT ≤ 1V -20 mA
Thermal-Shutdown Threshold TTS 0 ≤ VOUT ≤ 12V 140 °C
Thermal-Shutdown Hysteresis TTSH 15 °C
VIN = +12V 125
Input Current (A and B) IA, B D E = GN D , V
C C
= GN D or
5.5V VIN = -7V -100 µA
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
_______________________________________________________________________________________ 3
DC ELECTRICAL CHARACTERISTICS (continued)
(VCC = +5V ±10%, TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
RECEIVER
Receiver Differential Threshold
Voltage VTH -7V ≤ VCM ≤ +12V, Figure 2 -200 0 +200 mV
Receiver Input Hysteresis VTH VA + VB = 0, Figure 2 25 mV
RO Output-High Voltage VOH IO = -1mA, Figure 2 VCC -
0.6 V
RO Output-Low Voltage VOL IO = 1mA, Figure 2 0.4 V
Tri-State Output Current at Receiver IOZR 0 ≤ VO ≤ VCC, Figure 2 -1 +1 µA
Receiver-Input Resistance RIN -7V ≤ VCM ≤ +12V, Figure 2 96 kΩ
Receiver-Output Short-Circuit Current IOSR 0 ≤ VRO ≤ VCC, Figure 2 -80 +80 mA
SUPPLY CURRENT
No load, RE = 0, DE = VCC 23
No load, RE = VCC, DE = VCC 23
Supply Current ICC No load, RE = 0V, DE = 0 or leave
unconnected 23
mA
Shutdown Current
(MAX13182E/MAX13184E Only) ISHDN
RE = VCC or leave unconnected,
DE = GND or leave unconnected 2.5 10 µA
ESD PROTECTION
Human Body Model ±15
IEC 61000-4-2 Contact Discharge ±6
ESD Protection for Y, Z, A and B
IEC 61000-4-2 Air-Gap Discharge ±12
kV
DRIVER SWITCHING CHARACTERISTICS—MAX13181E/MAX13182E (SLEW-RATE LIMITED
TO 250kbps)
(VCC = +5V ±10%, TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
tDPLH CL = 50pF, RL = 54Ω, Figure 3 200 1000
Driver Propagation Delay tDPHL CL = 50pF, RL = 54Ω, Figure 3 200 1000 ns
Driver Differential Output Rise or
Fall Time tDR, tDF CL = 50pF, RL = 54Ω, Figure 3 400 1200 ns
Differential Driver Output Skew
(tDPLH - tDPHL)tDSKEW CL = 50pF, RL = 54Ω, Figure 3 140 ns
Maximum Data Rate 250 kbps
Driver Enable to Output High tDZH Figure 4a 2500 ns
Driver Enable to Output Low tDZL Figure 4b 2500 ns
Driver Disable Time from Low tDLZ Figure 4b 100 ns
Driver Disable Time from High tDHZ Figure 4a 100 ns
D r i ver E nab l e fr om S hutd ow n to Outp ut H i g ht
DZH
(
SHDN
)
(MAX13182E) Figure 4a 5500 ns
D r i ver E nab l e fr om S hutd ow n to Outp ut Low tDZL
(
SHDN
)
(MAX13182E) Figure 4b 5500 ns
Time to Shutdown tSHDN (MAX13182E) 50 200 600 ns
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
4 _______________________________________________________________________________________
DRIVER SWITCHING CHARACTERISTICS—MAX13183E/MAX13184E (MAXIMUM DATA
RATE OF 16Mbps)
(VCC = +5V ±10%, TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
tDPLH CL = 50pF, RL = 54Ω, Figure 3 25
Driver Propagation Delay tDPHL CL = 50pF, RL = 54Ω, Figure 3 25 ns
D r i ver D i ffer enti al Outp ut Ri se or Fal l Ti m et
DR, tDF CL = 50pF, RL = 54Ω, Figure 3 15 ns
Differential Driver Output Skew
(tDPLH - tDPHL)tDSKEW CL = 50pF, RL = 54Ω, Figure 3 8 ns
Maximum Data Rate 16 Mbps
Driver Enable to Output-High tDZH Figures 1 and 4a 50 ns
Driver Enable to Output-Low tDZL Figures 1 and 4b 50 ns
Driver Disable Time from Low tDLZ Figures 1 and 4b 50 ns
Driver Disable Time from High tDHZ Figures 1 and 4a 50 ns
Driver Enable from Shutdown to Output
High tDZH
(
SHDN
)
Figures 1 and 4a (MAX13184E) 2200 ns
Driver Enable from Shutdown to Output
Low tDZL
(
SHDN
)
Figures 1 and 4b (MAX13184E) 2200 ns
Time to Shutdown tSHDN (MAX13184E) 50 200 600 ns
RECEIVER SWITCHING CHARACTERISTICS
(VCC = +5V ±10%, TA=TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +5V and TA= +25°C.) (Note 1)
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
tRPLH 40 75
Receiver Propagation Delay tRPHL
CL = 15pF, Figure 5 40 75 ns
Receiver Output Skew (tRPLH - tRPHL)t
RSKEW CL = 15pF, Figure 5 8 ns
Maximum Data Rate 16 Mbps
Receiver Enable to Output Low tRZL (MAX13182E/MAX13184E)
Figures 2 and 6 50 ns
Receiver Enable to Output High tRZH (MAX13182E/MAX13184E)
Figures 2 and 6 50 ns
Receiver Disable Time from Low tRLZ (MAX13182E/MAX13184E)
Figures 2 and 6 50 ns
Receiver Disable Time from High tRHZ (MAX13182E/MAX13184E)
Figures 2 and 6 50 ns
Receiver Enable from Shutdown to
Output High tRZH
(
SHDN
)
(MAX13182E/MAX13184E)
Figures 2 and 6 2200 ns
Receiver Enable from Shutdown to
Output Low tRZL
(
SHDN
)
(MAX13182E/MAX13184E)
Figures 2 and 6 2200 ns
Note 1: All currents into the device are positive. All currents out of the device are negative. All voltages are referred to device ground,
unless otherwise noted. µDFN devices are production tested at +25°C. Overtemperature limits are guaranteed by design.
Note 2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes state.
Note 3: The short-circuit output current applies to peak current just prior to foldback current limiting. The short-circuit foldback output
current applies during current limiting to allow a recovery from bus contention.
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
_______________________________________________________________________________________ 5
VOD CL
RL2
RL2VOC
Y
Z
Figure 1. Driver Differential Output
A (Y)
CL
B (Z)
RO
GND
VOH
VOL
Figure 2. Receiver Differential Input
DI
3V
0
Z
Y
VO
0
-VO
VO
1.5V
tDPLH tDPHL
1/2 VO
10%
tDR
90% 90%
1/2 VO
10%
tDF
VDIFF = V (Y) - V (Z)
VDIFF
tDSKEW = | tDPLH - tDPHL
Figure 3. Driver Propagation Delay
DE
tDZH , tDZH(SHDN)
VCC / 2
VCC
0
VOH
0
VOM = (0 + VOH) / 2
tDHZ
OUT
0.5V
GENERATOR 50Ω
CL
50pF RL = 500Ω
OUT
S1
0 OR 3V D
Figure 4a. Driver Enable and Disable Times (tDHZ, tDZH, tDZH(SHDN))
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
6 _______________________________________________________________________________________
DE
VOL
tDZL , tDZL(SHDN)
VCC / 2
VCC
VOH
0
VOM = (VOL + VCC) / 2
tDLZ
OUT
VCC
0.5V
GENERATOR 50Ω
DE CL
50pF
RL = 500Ω
OUT
S1
0 OR 3V
VCC
D
Figure 4b. Driver Enable and Disable Times (tDLZ, tDZL, tDZL(SHDN))
A (Y)
B (Z)
RO
VOH
1.5V
tRPLH
tRPHL
VOL
+1V
-1V
tRSKEW = | tRPLH - tRPHL |
THE RISE TIME AND FALL TIME OF INPUTS A, B, Y AND Z < 4ns
Figure 5. Receiver Propagation Delay
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
_______________________________________________________________________________________ 7
S1 OPEN
S2 CLOSED
S3 = +1.5V
RO
5V
0
0
VOH
VOH / 2
S1 OPEN
S2 CLOSED
S3 = +1.5V
tRHZ
5
0
0
VOH
0.5V
2.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
5V
0
VOL
VCC
1.5V
S1 CLOSED
S2 OPEN
S3 = -1.5V
tRLZ
5V
0
VOL
5V
2.5V
0.5V
GENERATOR
5V
+1.5V
1kΩ
CL
15pF S2
S1
50Ω
S3
-1.5V R
VID
RE
RO
RE
RO
RE
RO
RE
tRZH, tRZH(SHDN) tRZL, tRZL(SHDN)
(VOL + VOH) / 2
Figure 6. Receiver Disable Time
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
8 _______________________________________________________________________________________
Typical Operating Characteristics
(VCC = +5V, TA= 25°C, unless otherwise noted.)
0
1
3
2
4
5
-40 10-15 35 60 85
SUPPLY CURRENT
vs. TEMPERATURE
MAX13181E-4E toc01
TEMPERATURE (°C)
SUPPLY CURRENT (mA)
NO LOAD
RE = VCC
DE = VCC
0
4
12
8
16
20
021345
OUTPUT CURRENT
vs. RECEIVER OUTPUT HIGH VOLTAGE
MAX13181E-4E toc02
RECEIVER OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
0
6
18
12
24
30
021345
OUTPUT CURRENT
vs. RECEIVER OUTPUT LOW VOLTAGE
MAX13181E-4E toc03
RECEIVER OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
4.0
4.4
4.2
4.8
4.6
5.2
5.0
5.4
-40 10-15 356085
RECEIVER OUTPUT HIGH VOLTAGE
vs. TEMPERATURE
MAX13181E-4E toc04
TEMPERATURE (°C)
RECEIVER OUTPUT HIGH VOLTAGE (V)
IO = -1mA
0
0.1
0.3
0.2
0.4
0.5
-40 10-15 35 60 85
RECEIVER OUTPUT LOW VOLTAGE
vs. TEMPERATURE
MAX13181E-4E toc05
TEMPERATURE (°C)
RECEIVER OUTPUT LOW VOLTAGE (V)
IO = -1mA
80
60
40
20
0
021 345
DRIVER DIFFERENTIAL OUTPUT CURRENT
vs. DIFFERENTIAL OUTPUT VOLTAGE
MAX13181E-4E toc06
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIVER DIFFERENTIAL OUTPUT CURRENT (mA)
0
1
3
2
4
5
-40 10-15 35 60 85
DRIVER DIFFERENTIAL OUTPUT VOLTAGE
vs. TEMPERATURE
MAX13181E-4E toc07
TEMPERATURE (°C)
DRIVER DIFFERENTIAL OTUPUT VOLTAGE (V)
RL = 54Ω
0
20
40
60
80
OUTPUT CURRENT
vs. TRANSMITTER OUTPUT HIGH VOLTAGE
MAX13181E-4E toc08
TRANSMITTER OUTPUT HIGH VOLTAGE (V)
OUTPUT CURRENT (mA)
-8 -2 0-6 -4 2 4 6
0
40
20
80
60
100
120
OUTPUT CURRENT
vs. TRANSMITTER OUTPUT LOW VOLTAGE
MAX13181E-4E toc09
TRANSMITTER OUTPUT LOW VOLTAGE (V)
OUTPUT CURRENT (mA)
046281012
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
_______________________________________________________________________________________
9
Typical Operating Characteristics (continued)
(VCC = +5V, TA= 25°C, unless otherwise noted.)
0
2
6
4
8
10
-40 10-15 35 60 85
SHUTDOWN CURRENT
vs. TEMPERATURE
MAX13181E-4E toc10
TEMPERATURE (°C)
SHUTDOWN CURRENT (μA)
200
300
500
400
600
700
-40 10-15 35 60 85
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (250kbps) (MAX13182E)
MAX13181E-4E toc11
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (ns)
CL = 50pF
RL = 54Ω
tDPHL
tPDLH
0
10
30
20
40
50
-40 10-15 35 60 85
DRIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps) (MAX13184E)
MAX13181E-4E toc12
TEMPERATURE (°C)
DRIVER PROPAGATION DELAY (ns)
CL = 50pF
RL = 54Ω
tDPHL tPDLH
DRIVER PROPAGATION DELAY
(250kbps) (MAX13182E)
MAX13181E-4E toc16
400ns/div
VY - VZ
2V/div
DI
2V/div
CL = 50pF
RL = 54Ω
DRIVER PROPAGATION DELAY
(16Mbps) (MAX13184E)
MAX13181E-4E toc18
10ns/div
VY - VZ
2V/div
DI
2V/div
CL = 50pF
RL = 54Ω
0
10
30
20
40
50
-40 10-15 35 60 85
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (250kbps) (MAX13182E)
MAX13181E-4E toc13
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
CL = 15pF
tRPLH
tRPHL
0
10
30
20
40
50
-40 10-15 35 60 85
RECEIVER PROPAGATION DELAY
vs. TEMPERATURE (16Mbps) (MAX13184E)
MAX13181E-4E toc14
TEMPERATURE (°C)
RECEIVER PROPAGATION DELAY (ns)
CL = 15pF
tRPLH
tRPHL
RECEIVER PROPAGATION DELAY
(250kbps) (MAX13182E)
MAX13181E-4E toc15
400ns/div
VA - VB
2V/div
RO
2V/div
CL = 15pF
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
10 ______________________________________________________________________________________
X = Don’t care.
Functional Tables
TRANSMITTING
INPUT OUTPUT
RE DE DI Z Y
X10 1 0
X11 0 1
00X High
impedance
High
impedance
10X Shutdown
(high impedance)
RECEIVING
INPUT OUTPUT
RE DE A-B RO
0X≥ 200mV 1
0X≤ - 200m V 0
1 1 X High impedance
10X Shutdown
(high impedance)
MAX13182E/MAX13184E
TRANSMITTING
INPUT OUTPUT
DE DI Z Y
10 10
11 01
0X High
impedance
High
impedance
RECEIVING
INPUT OUTPUT
H/FDE A-B Y-Z RO
0X≥ 200mV X 1
0X≤ - 200m V X 0
10X≥ 200mV 1
10X≤ -200mV 0
MAX13181E/MAX13183E
MAX13182E
MAX13184E
RIN_UP
RIN_DWN
RIN_DWN
VCC
RO
GND
RE
DE
DE
DI
Y
Z
B
A
MAX13181E
MAX13183E
VCC
RO
H/F
GND
DI
A
B
Y
Z
RIN_DWN
VCC
D
R
Functional Diagram
Detailed Description
The MAX13181E–MAX13184E high-speed transceivers
for RS-485 communication contain one driver and one
receiver. These devices feature 1/8 unit-load input
impedance that allows up to 256 receivers on the bus.
All devices feature integrated pullup/pulldown resistors
on the DE, RE, and H/Finputs to reduce external com-
ponents. The MAX13182E/MAX13184E feature a low-
current shutdown mode for power-sensitive applications.
The MAX13181E/MAX13182E feature reduced slew-rate
drivers to minimize EMI and reflections that are caused
by improperly terminated cables. The slew-rate limited
MAX13181E/MAX13182E allow error-free transmission
up to 250Kbps. The MAX13183E/MAX13184E feature
full-speed drivers allowing data rate of up to 16Mbps.
The MAX13182E/MAX13184E are configured for full-
duplex operation. The MAX13181E/MAX13183E feature
selectable half- or full-duplex operation by driving H/F
input high or low, respectively. All devices operate from
a single +5.0V supply.
±15kV ESD Protection
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 driver outputs of the MAX13181E–
MAX13184E family have extra protection against static
electricity. Maxim’s engineers have developed state-of-
the-art structures to protect these driver outputs against
ESD of ±15kV with VCC = 5V, and regardless of the
logic state of DE and DI.
The ESD-protected pins are tested with reference to the
ground pin in a powered-down condition. They are test-
ed to ±15kV using the Human Body Model, ±12kV using
the IEC 61000-4-2 Air-Gap Discharge Model, and to
±6kV using the IEC 61000-4-2 Contact Discharge Model.
ESD Test Conditions
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
______________________________________________________________________________________ 11
Pin Description
MAX13181E/
MAX13183E
MAX13182E/
MAX13184E
MAX13182E/
MAX13184E
µDFN SO
NAME
FUNCTION
1114
VCC
Positive Supply, VCC = +4.5V to +5.5V. Bypass VCC with a 0.1µF ceramic
capacitor to ground.
222RO
Receiver Output. When RE is low and (A-B) ≥ 200mV, RO is high; if (A-B) ≤
-200mV, RO is low.
—3 3RE Receiver Output Enable. Drive RE low to enable RO. Drive RE high to
disable the receiver. RE input has an internal pullup resistor.
3——
H/F
Half-/Full-Duplex Selector Input. Connect H/F to VCC for half-duplex mode.
Leave H/F unconnected or connect H/F to GND for full-duplex mode. H/F
input has an internal pulldown resistor.
444DE
D r i ver O utp ut E nab l e. D r i ve D E hi g h to enab l e the d r i ver . D r i ver outp ut i s hi g h
i m p ed ance w hen D E i s l ow . D E i np ut has an i nter nal p ul l d ow n r esi stor .
555DI
Driver Input. With DE high, a low on DI forces noninverting output low and
inverting output high. Similarly, a high on DI forces noninverting output high
and inverting output low.
6 6 6, 7
GND
Ground
779Y
Noninverting Driver Output. (Also noninverting receiver input in half-duplex
mode.)
8 8 10 Z Inver ti ng D r i ver Outp ut. ( Al so i nver ti ng r ecei ver i np ut i n hal f- d up l ex m od e.)
9 9 11 B Inverting Receiver Input
10 10 12 A Noninverting Receiver Input
— — 1, 8, 13
N.C.
No Connection. N.C. is not internally connected.
MAX13181E–MAX13184E
Human Body Model
Figure 7a shows the Human Body Model, and Figure 7b
shows the current waveform it generates when discharged
into a low impedance. This model consists of a 100pF
capacitor charged to the ESD voltage of interest, which is
then discharged into the test device through a 1.5kΩresistor.
Machine Model
The IEC 61000-4-2 standard covers ESD testing and
performance of finished equipment. However, it does
not specifically refer to integrated circuits. The
MAX13485E/MAX13486E help equipment designs to
meet IEC 61000-4-2, without the need for additional
ESD protection components.
The major difference between tests done using the
Human Body Model and IEC 61000-4-2 is higher peak
current in IEC 61000-4-2 because series resistance is
lower in the IEC 61000-4-2 model. Hence, the ESD with-
stand voltage measured to IEC 61000-4-2 is generally
lower than that measured using the Human Body
Model. Figure 7c shows the IEC 61000-4-2 model, and
Figure 7d shows the current waveform for the IEC
61000-4-2 ESD Contact Discharge test.
Applications Information
256 Transceiver on the Bus
The standard RS-485 receiver input impedance is 12kΩ
(one-unit load), and the standard driver can drive up to 32
unit loads. The MAX13181E–MAX13184E family trans-
ceivers have a 1/8-unit load receiver input impedance
(96kΩ), allowing up to 256 transceivers to be connected
in parallel on one communication line. Any combination of
these devices and/or other RS-485 transceivers with a
total of 32 unit loads or less can be connected to the line.
Reduced EMI and Reflections
The MAX13181E/MAX13182E are slew-rate limited, min-
imizing EMI and reducing reflections caused by improp-
erly terminated cables. This slew-rate limited feature
allows error-free data transmission up to 250kbps.
MAX13181E/MAX13183E Low-Power
Shutdown Mode
The MAX13181E/MAX13183E feature low power shut-
down mode. Low-power shutdown mode is initiated by
bringing RE high and DE low. In shutdown, the devices
typically draw only 2.5µA (typ) of supply current. RE
and DE can be driven simultaneously. If RE is high and
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
12 ______________________________________________________________________________________
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
100pF
RC
1MΩ
RD
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 7a. Human Body ESD Test Model
IP 100%
90%
36.8%
tRL TIME
tDL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Ir
10%
0
0
AMPS
Figure 7b. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
Cs
150pF
RC
50MΩ TO 100MΩ
RD
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 7c. IEC 61000-4-2 ESD Test Model
tr = 0.7ns TO 1ns 30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 7d. IEC 61000-4-2 ESD Generator Current Waveform
DE is low for 200ns (typ), the devices are guaranteed to
enter shutdown.
Enable times tZH and tZL (see the
Switching Character-
istics
) assume the devices are not in a low-power shut-
down state. Enable times tZH(SHDN) and tZL(SHDN)
assume the devices are in a shutdown state. It takes dri-
vers and receivers longer to become enabled from low-
power shutdown mode (tZH(SHDN), tZL(SHDN)) than from
driver-/receiver-disable mode (tZH, tZL).
Line Length
The RS-485 standard covers line lengths up to 4000ft.
For line lengths greater than 4000ft, use the repeater
application shown in Figure 8.
Typical Applications
The MAX13181E–MAX13184E transceivers are designed
for bidirectional data communications on multipoint bus
transmission lines. The MAX13181E/MAX13183E can be
used in either half-duplex or full-duplex configuration.
The MAX13182E/MAX13184E are for full-duplex only.
Figure 9 shows the typical network application circuit for
half-duplex, and Figures 10 and 11 show typical network
application circuits for full duplex.
To minimize reflections, terminate the line at both ends in
its characteristics impedance, and keep stub lengths off
the main line as short as possible. The slew-rate-limited
MAX13181E/MAX13182E are more tolerant of imperfect
termination.
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
______________________________________________________________________________________ 13
RO
DI
(H/F)
DE
R
D
MAX13182E/MAX13184E
(FULL DUPLEX)
*RE 120Ω
120Ω
A
B
Z
Y
DATA IN
DATA OUT
(H/F for MAX13181E/
MAX13183E ONLY)
*RE FOR
Figure 8. Line Repeater for MAX13181E–MAX13184E
DI RO DE
A
B
RE
RO
RO
RO
DI
DI
DI
DE
DE
DE
H/F
DD
D
R
R
R
BB
B
AAA
120Ω
VCC
120Ω
D
R
MAX13181E–MAX13184E
CONFIGURED FOR HALF-
DUPLEX OPERATION
RERE
Figure 9. Typical Half-Duplex RS-485 Network
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
14 ______________________________________________________________________________________
RO
DI
H/F
DE
R120Ω
120Ω
D
MAX13181E/MAX13183E
CONFIGURED FOR FULL-
DUPLEX OPERATION
RO
DI
DE
R
D
RE
120Ω
120Ω
A
B
Z
Y
A
B
Z
Y
RO
DI DE
R
D
RE
YZBA
RO
DI DE
R
D
RE
YZBA
Figure 10. Typical Full-Duplex RS-485 Network
RO
DI
DE
R120Ω
120Ω
D
MAX13182E/MAX13184E
CONFIGURED FOR FULL-
DUPLEX OPERATION
RO
DI
DE
R
D
RE
120Ω
120Ω
A
B
Z
Y
A
B
Z
Y
RO
DI DE
R
D
RE
YZBA
RO
DI DE
R
D
RE
YZBA
Figure 11. Typical Full-Duplex RS-485 Network
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
______________________________________________________________________________________ 15
Ordering Information (continued)
+
Denotes a lead-free package.
PART TEMP RANGE PIN-PACKAGE TOP MARK PKG CODE
MAX13183EELB+ -40°C to +85°C 10 µDFN ABA L1022-1
MAX13184EELB+ -40°C to +85°C 10 µDFN ABB L1022-1
MAX13184EESD+ -40°C to +85°C 14 SO — S14-1
Chip Information
PROCESS: BiCMOS
Pin Configurations (continued)
MAX13182E
MAX13184E
1N.C. 14 VCC
2RO 13 N.C.
3RE 12 A
4DE 11 B
5DI 10 Z
6GND 9Y
7GND 8 N.C.
TOP VIEW
SO
+
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
16 ______________________________________________________________________________________
6, 8, 10L UDFN.EPS
EVEN TERMINAL
L
C
ODD TERMINAL
L
C
L
e
L
A
e
E
D
PIN 1
INDEX AREA
b
e
A
b
N
SOLDER
MASK
COVERAGE
A A
1
PIN 1
0.10x45∞
LL1
(N/2 -1) x e)
XXXX
XXXX
XXXX
SAMPLE
MARKING
A1
A2
7
A1
2
21-0164
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
-DRAWING NOT TO SCALE-
Package Information
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
______________________________________________________________________________________ 17
COMMON DIMENSIONS
SYMBOL MIN. NOM.
A0.70 0.75
A1
D1.95 2.00
E1.95 2.00
L0.30 0.40
PKG. CODE N e b
PACKAGE VARIATIONS
L1
6L622-1 0.65 BSC 0.30±0.05
0.25±0.050.50 BSC8L822-1
0.20±0.030.40 BSC10L1022-1
2.05
0.80
MAX.
0.50
2.05
0.10 REF.
(N/2 -1) x e
1.60 REF.
1.50 REF.
1.30 REF.
A2
-
-DRAWING NOT TO SCALE-
A
2
2
21-0164
PACKAGE OUTLINE,
6, 8, 10L uDFN, 2x2x0.80 mm
0.15 0.20 0.25
0.020 0.025 0.035
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)
MAX13181E–MAX13184E
+5.0V, ±15kV ESD-Protected, Half-Duplex/
Full-Duplex, RS-485 Transceiver in µDFN
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.
18
____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600
© 2007 Maxim Integrated Products is a registered trademark of Maxim Integrated Products, Inc.
SPRINGER
SOICN .EPS
PACKAGE OUTLINE, .150" SOIC
1
1
21-0041 B
REV.DOCUMENT CONTROL NO.APPROVAL
PROPRIETARY INFORMATION
TITLE:
TOP VIEW
FRONT VIEW
MAX
0.010
0.069
0.019
0.157
0.010
INCHES
0.150
0.007
E
C
DIM
0.014
0.004
B
A1
MIN
0.053A
0.19
3.80 4.00
0.25
MILLIMETERS
0.10
0.35
1.35
MIN
0.49
0.25
MAX
1.75
0.050
0.016L0.40 1.27
0.3940.386D
D
MINDIM
D
INCHES
MAX
9.80 10.00
MILLIMETERS
MIN MAX
16 AC
0.337 0.344 AB8.758.55 14
0.189 0.197 AA5.004.80 8
N MS012
N
SIDE VIEW
H 0.2440.228 5.80 6.20
e 0.050 BSC 1.27 BSC
C
HE
eBA1
A
D
0∞-8∞
L
1
VARIATIONS:
Package Information (continued)
(The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information,
go to www.maxim-ic.com/packages.)