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UM3352E Datasheet(PDF) 8 Page - Union Semiconductor, Inc.

Part No. UM3352E
Description  ESD-Protected, Slew-Rate-Limited, Fail-Safe, True RS-485 Transceivers
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Manufacturer  UNIONSEMI [Union Semiconductor, Inc.]
Direct Link  http://www.union-ic.com
Logo UNIONSEMI - Union Semiconductor, Inc.

UM3352E Datasheet(HTML) 8 Page - Union Semiconductor, Inc.

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http://www.union-ic.com Rev.07 Sep.2015
8/13
UM3352E
Figure 7. Driver Propagation Delays
Figure 8. Driver Enable and Disable Times
Figure 9. Receiver Propagation Delays
Figure 10. Receiver Enable and Disable Times
Detail Description
The UM3352E high-speed transceivers for RS-485 communication contain one driver and one
receiver. The device features fail-safe circuitry, which guarantees a logic-high receiver output when
the receiver input is open or shorted, or when it is connected to a terminated transmission line with
all drivers disabled. The UM3352E features reduced slew-rate driver that minimizes EMI and
reduces reflections caused by improperly terminated cables, allowing error-free data transmission up
to 500kbps. It operates from a single +5V supply. Drivers are output short-circuit current limited.
Thermal shutdown circuitry protects drivers against excessive power dissipation. When activated,
the thermal shutdown circuitry places the driver outputs into a high impedance state.
Fail-Safe
The UM3352E guarantees a logic-high receiver output when the receiver inputs are shorted or open,
or when they are connected to a terminated transmission line with all drivers disabled. This is done
by setting the receiver threshold between -50mV and -200mV. If the differential receiver input
voltage (A-B) is greater than or equal to -50mV, RO is logic high. If A-B is less than or equal to
-200mV, RO is logic low. In the case of a terminated bus with all transmitters disabled, the
receiver’s differential input voltage is pulled to 0V by the termination. With the receiver thresholds
of the UM3352E, this results in a logic high with a 50mV minimum noise margin. Unlike previous
fail-safe devices, the -50mV to -200mV threshold complies with the ±200mV EIA/TIA-485
standard.
DI
5V
B
0V
A
VO
1.5V
1.5V
tDPLH
tDPHL
1/2VO
1/2VO
-VO
VO
0V
VDIFF
90%
90%
10%
10%
tDF
tDR
VDIFF = VA - VB
tSKEW=|tDPLH-tDPHL|
Output Normally Low
Output Normally High
DE
5V
B
0V
A
1.5V
1.5V
VOL
VOH
VOL
VOH
2.3V
2.3V
tDLZ
tDZL(SHDN), tDZL
tDHZ
tDZH(SHDN), tDZH
VOL+0.5V
VOH-0.5V
VOH
VOL
RO
1V
-1V
B
A
1.5V
1.5V
OUTPUT
INPUT
tRPLH
tRPHL
Output Normally Low
Output Normally High
RE
5V
0V
RO
1.5V
VOH
VOL
1.5V
1.5V
tRLZ
tRZL(SHDN), tRZL
tRHZ
tRZH(SHDN), tRZH
VOL+0.5V
VOH-0.5V
1.5V


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