MAX4670ETJ+T Maxim Integrated Products, MAX4670ETJ+T Datasheet - Page 10

• Manufacturer Part Number: MAX4670ETJ+T
• Description: IC PROT SWITCH T1/E1/J1 32-TQFN
• Manufacturer: Maxim Integrated Products

Specifications of MAX4670ETJ+T

• Applications: *
• Mounting Type: Surface Mount
• Package / Case: 32-TQFN Exposed Pad
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant

The MAX4670 low 0.7Ω (typ) on-resistance is ade-
quate, even in applications where the LIUs require no
external series transmit resistors (Rt = 0 in Figures 8
and 10). However, in some instances, increase the LIU
output amplitude to compensate for R
ports programmable output amplitude. With LIUs
requiring external transmit resistors, it is recommended
to reduce Rt by the amount of the typical R
requiring external transmit resistors.
For example, if the LIU vendor recommends Rt = 9.1Ω,
the actual value in the application should be:
Integrated T1/E1/J1 Short-Haul and
Long-Haul Protection Switch
Table 1. MAX4670 Truth Table
Table 2. IEC 61000-4-5 Test Conditions
10
TEST CONFIGURATION
SWITCH
Common-Mode Surge
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
______________________________________________________________________________________
—
—
—
Differential Surge
(Line to GND)
(Line to Line)
Rt = Rt – R
LIU Interface Recommendations
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
INA
INB
INC
IND
X
X
X
X
ON
= 9.1Ω - 0.7 = 8.4Ω
1000V peak, 24A min current,
500V peak, 12A min current,
NC1/NC2
NC3/NC4
NC5/NC6
NC7/NC8
OFF
OFF
OFF
OFF
OFF
OFF
OFF
OFF
TEST CONDITIONS
ON
ON
ON
ON
8µs/20µs surge
8µs/20µs surge
ON
if the LIU sup-
ON
NO1/NO2
NO3/NO4
NO7/NO8
NO5/NC6
with LIUs
OFF
OFF
OFF
OFF
ON
ON
ON
ON
ON
ON
ON
ON
The receive interface series resistance is small enough
to support LIUs with internal line termination, provided
the external 120Ω parallel resistor combination (Rr) is
connected, as shown in Figures 7 and 9.
While in normal operation, the MAX4670 requires the
input and output signals to be within the V+ and GND
supply rails.
ESD performance depends on a variety of conditions.
Contact Maxim for a reliability report that documents
test setup, test methodology, and test results.
Figure 11 shows the Human Body Model. Figure 12
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 interest,
which is then discharged into the test device through a
1.5kΩ resistor.
The IEC 1000-4-2 standard covers ESD testing and
performance of finished equipment. It does not specifi-
cally refer to ICs. The major difference between tests
done using the Human Body Model and IEC 1000-4-2
is a higher peak current in IEC 1000-4-2, because
series resistance is lower in the IEC 1000-4-2 model.
Hence, the ESD withstands voltage measured to IEC
61000-4-2, and is generally lower than that measured
using the Human Body Model. Figure 13 shows the IEC
61000-4-2 model, and Figure 14 shows the current
waveform for the ±8kV IEC, 61000-4-2 Level 4, ESD
Contact Discharge test. The Air-Gap test involves
approaching the device with a charged probe. The
Contact Discharge method connects the probe to the
device before the probe is energized.
The Machine Model for ESD tests all pins using a
200pF storage capacitor and zero discharge resis-
tance. Its objective is to emulate the stress caused by
contact that occurs with handling and assembly during
manufacturing.
ESD Test Conditions
Human Body Model
Machine Model
IEC 1000-4-2