MAX13085EAPA Maxim Integrated, MAX13085EAPA Datasheet - Page 17

• Manufacturer Part Number: MAX13085EAPA
• Description: RS-422/RS-485 Interface IC
• Manufacturer: Maxim Integrated

Specifications of MAX13085EAPA

• Data Rate: 500 Kbps
• Operating Supply Voltage: 5 V
• Supply Current: 1.8 mA
• Operating Temperature Range: - 40 C to + 125 C
• Number Of Drivers: 1
• Number Of Receivers: 1
• Product: RS-422/RS-485 Combination

Maxim Integrated
Figure 10a. Human Body ESD Test Model
Figure 10b. Human Body Current Waveform
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 10c shows the IEC 61000-4-2 model, and Figure
10d shows the current waveform for IEC 61000-4-2 ESD
Contact Discharge test.
The machine model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. The objective is to emulate the stress caused
when I/O pins are contacted by handling equipment
during test and assembly. Of course, all pins require
this protection, not just RS-485 inputs and outputs.
VOLTAGE
SOURCE
AMPS
HIGH-
DC
I
P
36.8%
100%
90%
10%
CHARGE-CURRENT-
0
LIMIT RESISTOR
0
t
1MΩ
RL
R
C
100pF
C s
Hot-Swap, RS-485/RS-422 Transceivers
+5.0V, ±15kV ESD-Protected, Fail-Safe,
CURRENT WAVEFORM
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
TIME
1500Ω
R
t
D
DL
I r
PEAK-TO-PEAK RINGING
(NOT DRAWN TO SCALE)
Machine Model
DEVICE
UNDER
TEST
MAX13086E–MAX13089E
The standard RS-485 receiver input impedance is 12kΩ
(1-unit load), and the standard driver can drive up to 32-
unit loads. The MAX13080E family of transceivers has 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,
as well as other RS-485 transceivers with a total of 32-
unit loads or fewer, can be connected to the line.
The MAX13080E/MAX13081E/MAX13082E feature
reduced slew-rate drivers that minimize EMI and
reduce reflections caused by improperly terminated
cables, allowing error-free data transmission up to
250kbps. The MAX13083E/MAX13084E offer higher dri-
ver output slew-rate limits, allowing transmit speeds up
to 500kbps. The MAX13089E with SRL = V
nected are slew-rate limited. With SRL unconnected,
the MAX13089E error-free data transmission is up to
250kbps. With SRL connected to V
speeds up to 500kbps.
Figure 10c. IEC 61000-4-2 ESD Test Model
Figure 10d. IEC 61000-4-2 ESD Generator Current Waveform
VOLTAGE
SOURCE
t
HIGH-
r
DC
= 0.7ns TO 1ns
CHARGE-CURRENT-
LIMIT RESISTOR
100%
50MΩ TO 100MΩ
90%
10%
I
R
Applications Information
C
150pF
Reduced EMI and Reflections
256 Transceivers on the Bus
C s
30ns
RESISTANCE
DISCHARGE
STORAGE
CAPACITOR
330Ω
R
D
60ns
CC
, the data transmit
CC
DEVICE
UNDER
TEST
or uncon-
t
17