MAX13085EASA+T Maxim Integrated Products, MAX13085EASA+T Datasheet - Page 17

• Manufacturer Part Number: MAX13085EASA+T
• Description: IC TXRX RS485/RS422 8-SOIC
• Manufacturer: Maxim Integrated Products
• Type: Transceiverr

Specifications of MAX13085EASA+T

• Number Of Drivers/receivers: 1/1
• Protocol: RS422, RS485
• Voltage - Supply: 4.5 V ~ 5.5 V
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

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
100pF
C
______________________________________________________________________________________
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
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/MAX13085E
offer higher driver output slew-rate limits, allowing
transmit speeds up to 500kbps. The MAX13089E with
SRL = V
SRL unconnected, the MAX13089E error-free data
transmission is up to 250kbps. With SRL connected to
V
Figure 10c. IEC 61000-4-2 ESD Test Model
Figure 10d. IEC 61000-4-2 ESD Generator Current Waveform
CC
VOLTAGE
SOURCE
, the data transmit speeds up to 500kbps.
t
HIGH-
r
DC
= 0.7ns TO 1ns
CC
CHARGE-CURRENT-
LIMIT RESISTOR
100%
50MΩ TO 100MΩ
90%
10%
or unconnected are slew-rate limited. With
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
DEVICE
UNDER
TEST
t
17