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MAX13181EELB+T

P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18
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/F DE A-B Y-Z RO
0X≥ 200mV X 1
0X≤ - 200m V X 0
10X≥ 200mV 1
10X≤ -200mV 0
MAX13181E/MAX13183E
MAX13182E
MAX13184E
R
IN_UP
R
IN_DWN
R
IN_DWN
V
CC
RO
GND
RE
DE
DE
DI
Y
Z
B
A
MAX13181E
MAX13183E
V
CC
RO
H/F
GND
DI
A
B
Y
Z
R
IN_DWN
V
CC
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/F inputs 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 V
CC
= 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
V
CC
Positive Supply, V
CC
= +4.5V to +5.5V. Bypass V
CC
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 V
CC
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 1.5kΩ resistor.
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
C
s
100pF
R
C
1MΩ
R
D
1500Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 7a. Human Body ESD Test Model
I
P
100%
90%
36.8%
t
RL
TIME
t
DL
CURRENT WAVEFORM
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
I
r
10%
0
0
AMPS
Figure 7b. Human Body Current Waveform
CHARGE-CURRENT-
LIMIT RESISTOR
DISCHARGE
RESISTANCE
STORAGE
CAPACITOR
C
s
150pF
R
C
50MΩ TO 100MΩ
R
D
330Ω
HIGH-
VOLTAGE
DC
SOURCE
DEVICE
UNDER
TEST
Figure 7c. IEC 61000-4-2 ESD Test Model
t
r
= 0.7ns TO 1ns
30ns
60ns
t
100%
90%
10%
I
PEAK
I
Figure 7d. IEC 61000-4-2 ESD Generator Current Waveform
P1-P3P4-P6P7-P9P10-P12P13-P15P16-P18

MAX13181EELB+T

Mfr. #:
Buy MAX13181EELB+T
Manufacturer:
Maxim Integrated
Description:
RS-485 Interface IC Ic Txrx RS-485 +5.0V Esd
Lifecycle:
New from this manufacturer.
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