UM3488/UM3491
+3.3V Low Power，±15kV ESD-Protected, Fail-Safe,
RS-422 Transceivers
UM3488EESA SOP8
UM3488EEPA DIP8
UM3491EESE SOP14
UM3491EEPE DIP14
General Description
The UM3488/UM3491 is ±15kV electrostatic discharge (ESD)-protected, high-speed transceivers
for RS-422 communication that contain one driver and one receiver. The UM3491 contains an
additional receiver and driver enable control. The device features fail-safe circuitry, which
guarantees a logic-high receiver output when the receiver inputs are open or shorted. This means
that the receiver output will be a logic high if all transmitters on a terminated bus are disabled
(high impedance). The UM3488/UM3491 allows transmit speeds up to 10Mbps. The device
features enhanced ESD protection. All transmitter outputs and receiver inputs are protected to
±15kV using the Human Body Model.
These transceivers typically draw 180µA of supply current when unloaded, or when fully loaded
with the drivers disabled.
The device has a 1/8-unit-load receiver input impedance that allows up to 256 transceivers on the
bus. The UM3488/UM3491 is intended for full-duplex communications.
Applications
Features
RS-422 Communications
Level Translators
Transceivers for EMI-Sensitive
Applications
Industrial-Control Local Area
Networks
ESD Protection for RS-422 I/O Pins
±15kV, Human Body Model
True Fail-Safe Receiver while Maintaining
EIA/TIA-422 Compatibility
Maximum Data Rate up to 10Mbps
Error-Free Data Transmission
1nA Low-Current Shutdown Mode
(UM3491)
Allow up to 256 Transceivers on the Bus
Selector Guide
Part
Number
Half/Full
Duplex
Data
Rate
(Mbps)
SlewRate
Limited
LowPower
Shutdown
Receiver/
Driver
Enable
Quiescent
Current
(µA)
Transceivers
On
Bus
Pin
Count
UM3488
full
10
Yes
No
No
180
256
8
UM3491
full
10
Yes
Yes
Yes
180
256
14
Ordering Information
Part Number
Temperature Range
Packaging Type
Shipping Qty
UM3488EESA
-40°C to +85°C
SOP8
3000pcs/13 Inch Tape & Reel
UM3488EEPA
-40°C to +85°C
DIP8
50pcs/Tube
UM3491EESE
-40°C to +85°C
SOP14
2500pcs/13 Inch Tape & Reel
UM3491EEPE
-40°C to +85°C
DIP14
25pcs/Tube
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UM3488/UM3491
Pin Configurations
Top View
XX: Week Code
UM3488EESA
SOP8
XX: Week Code
UM3488EEPA
DIP8
XX: Week Code
UM3491EESE
SOP14
XX: Week Code
UM3491EEPE
DIP14
Absolute Maximum Ratings
Symbol
Parameter
Value
Unit
VCC
Supply Voltage
+7
V
Control Input Voltage (R E , DE)
-0.3V to (VCC + 0.3V)
V
Driver Input Voltage (DI)
-0.3V to (VCC + 0.3V)
V
Driver Output Voltage (Y, Z)
-7.5 to +12.5
V
Receiver Input Voltage (A, B)
-7.5 to +12.5
V
Receiver Output Voltage (RO)
-0.3V to (VCC + 0.3V)
V
8-Pin SO (derate 9.09mW/°C above +70°C)
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C)
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C)
520
727
800
14-Pin SO (derate 8.33mW/°C above +70°C)
667
TA
Ambient Temperature
-40 to +85
°C
TJ
Junction Temperature
-40 to +150
°C
TSTG
Storage Temperature Range
-65 to +150
°C
TL
Lead Temperature for Soldering 10 seconds
+300
°C
______
PD
mW
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UM3488/UM3491
Thermal Information
Symbol
RθJA
Thermal Metric
Value
Junction to Ambient Thermal Resistance
RθJC
Junction to Case Thermal Resistance
SOP8
110
SOP14
85
DIP8
87
DIP14
63
SOP8
54
SOP14
42
DIP8
43
DIP14
37
UNIT
°C/W
DC Electrical Characteristics
(VCC = +3.3V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V
and TA = +25°C.) (Note 1)
Parameter
DRIVER
Symbol
Test Conditions
Min
Typ
Max
Unit
VCC
V
Differential Driver Output
(No Load)
VOD1
Figure 3
Differential Driver Output
VOD2
Figure 3, R = 50Ω
1.8
VCC
V
Differential Driver Output
VOD3
Figure 3, R = 27Ω
1.3
VCC
V
ΔVOD
Figure 3, R = 50Ω
0.2
V
VOC
Figure 3, R = 50Ω
3.0
V
Input High Voltage
VIH
DE, DI, R E
Input Low Voltage
VIL
DE, DI, R E
DI Input Hysteresis
VHYS
Driver Short-Circuit Output
Current (Note 3)
VOD1
Change-in-Magnitude of
Differential Output Voltage
(Note 2)
Driver Common-Mode
Output Voltage
______
2.0
V
______
0.8
mV
100
-7V≤VOUT≤VCC
V
-250
mA
0V≤VOUT≤12V
250
RECEIVER
Input Current (A and B)
Receiver Differential
Threshold Voltage
IIN
VTH
DE = GND,
VCC = GND or
3.465V
125
VIN = 12V
µA
VIN = -7V
-7V≤VCM≤12V
-75
-200
-125
-50
mV
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UM3488/UM3491
Receiver Input Hysteresis
ΔVTH
Receiver Output High
Voltage
VOH
IO = -4mA, VID = -50mV
Receiver Output Low Voltage
VOL
IO = 4mA, VID = -200mV
0.4
V
Three-State Output Current at
Receiver
IOZR
0.4V ≤ VO ≤ 2.4V
±1
µA
Receiver Input Resistance
RIN
-7V≤VCM≤12V
96
IOSR
0V≤VRO ≤VCC
±7
Receiver Output Short Circuit
Current
SUPPLY CURRENT
Supply Current
Supply Current in Shutdown
Mode
ESD Protection for Y, Z, A, B
ICC
ISHDN
25
No load,
DE
=DI=GND
or VCC
mV
VCC
-0.4
V
kΩ
±95
______
20
60
______
180
300
DE = GND, V R E = VCC
0.001
10
Human Body Model
±15
R E =VCC
R E =GND
______
mA
µA
µA
kV
Note 1: All currents into the device are positive; all currents out of the device are negative. All
voltages are referred to device ground unless otherwise noted.
Note 2: ΔVOD and ΔVOC are the changes in VOD and VOC, respectively, when the DI input changes
state.
Note 3: Maximum current level applies to peak current just prior to foldback-current limiting;
minimum current level applies during current limiting.
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UM3488/UM3491
Switching Characteristics
(VCC = +3.3V ± 5%, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.3V
and TA = +25°C.)
Parameter
Driver Input-to-Output
Driver Output Skew
| tDPLH - tDPHL |
Symbol
tDPLH
tDPHL
tDSKEW
Test Conditions
Figures 5 and 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Min
Typ
Max
10
30
60
10
30
60
10
25
ns
15
30
ns
10
Mbps
Figures 5 and 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Figures 5 and 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
Unit
ns
Driver Rise or Fall Time
tDR, tDF
Maximum Data Rate
fMAX
Driver Enable to Output
High
tDZH
Figures 6 and 8, CL = 100pF,
S2 closed
40
70
ns
Driver Enable to Output Low
tDZL
Figures 6 and 8, CL = 100pF,
S1 closed
40
70
ns
Driver Disable Time from
Low
tDLZ
Figures 6 and 8, CL = 15pF,
S1 closed
40
70
ns
Driver Disable Time from
High
tDHZ
Figures 6 and 8, CL = 15pF,
S2 closed
40
70
ns
Receiver Input to Output
tRPLH,
tRPHL
Figures 9 and 11; | VID | ≥2.0V;
rise and fall time of VID≤ 1 5ns
100
180
ns
| tRPLH - tRPHL | Differential
Receiver Skew
tRSKD
Figures 9 and 11; | VID | ≥2.0V;
rise and fall time of VID≤ 1 5ns
13
Receiver Enable to Output
Low
tRZL
Figures 4 and 10, CL = 100pF,
S1 closed
40
100
ns
Receiver Enable to Output
High
tRZH
Figures 4 and 10, CL = 100pF,
S2 closed
40
100
ns
Receiver Disable Time from
Low
tRLZ
Figures 4 and 10, CL = 100pF,
S1 closed
40
100
ns
Receiver Disable Time from
High
tRHZ
Figures 4 and 10, CL = 100pF,
S2 closed
40
100
ns
Time to Shutdown
tSHDN
(Note 4)
200
600
ns
Driver Enable from
Shutdown to Output High
tDZH(SHDN)
Figures 6 and 8, CL = 15pF,
S2 closed
40
200
ns
Driver Enable from
Shutdown to Output Low
tDZL(SHDN)
Figures 6 and 8, CL = 15pF,
S1 closed
40
200
ns
Receiver Enable from
Shutdown- to-Output High tRZH(SHDN)
Figures 4 and 10, CL = 100pF,
S2 closed
150
500
ns
Receiver Enable from
Shutdown- to-Output Low tRZL(SHDN)
Figures 4 and 10, CL = 100pF,
S1 closed
150
500
ns
5
20
50
ns
______
Note 4: The device is put into shutdown by bringing R E high and DE low. If the enable inputs are in
this state for less than 50ns, the device is guaranteed not to enter shutdown. If the enable inputs are in
this state for at least 600ns, the device is guaranteed to have entered shutdown.
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UM3488/UM3491
Typical Operating Characteristics
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
Output Current vs.Receiver Output
High Voltage
250
30
225
25
200
175
150
RE=L,DE=H
RE=L,DE=H
125
Output Current (μA)
No Load Supply Current(μA)
No Load Supply Current vs.
Temperature
20
15
10
5
100
0
-60
-40
-20
0
20
40
60
80
100
0
1
Temperature(℃ )
Output Current vs. Receiver Output
Low Voltage
3
4
Receiver Output High Voltage vs.
Temperature
60
Receiver Output High Voltage(V)
3
50
Output Current (μA)
2
Output High Voltage (V)
40
30
20
10
0
IRO=8mA
2.95
2.9
2.85
2.8
2.75
2.7
2.65
2.6
2.55
2.5
0
1
2
3
Output Low Voltage (V)
4
-60
-40
-20
0
20
40
60
80
100
Temperature(℃ )
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UM3488/UM3491
Typical Operating Characteristics (Continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
Receiver Output Low Voltage vs.
Temperature
Driver Differential Output Voltage vs.
Temperature
2
Receiver Output Low Voltage(V)
0.4
1.9
IRO=8mA
RT=54ohm
1.8
Output Voltage(V)
0.35
0.3
0.25
0.2
1.7
1.6
1.5
1.4
1.3
1.2
0.15
1.1
0.1
1
-60
-40
-20
0
20
40
60
80
100
Temperature(℃ )
-60
-40
-20
0
20
40
60
80
Temperature(℃ )
Driver Output Current vs.Differential
Output Voltage
Output Current (mA)
100
10
1
0.1
0
0.5
1
1.5
2
2.5
3
3.5
Differential Output Voltage (V)
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100
UM3488/UM3491
Pin Description
Pin Number
UM3488 UM3491
Symbol
Function
-
1
NC
Not Connected
2
2
RO
Receiver Output. When RE is low and if A - B ≥-50mV, RO
will be high; if A - B ≤ -200mV, RO will be low.
______
______
Receiver Output Enable. Drive RE low to enable RO; RO is
-
3
______
RE
high impedance when RE is high. Drive RE high and DE
low to enter low-power shutdown mode.
Driver Output Enable. Drive DE high to enable driver outputs.
-
4
DE
3
5
DI
4
6
GND
These outputs are high impedance when DE is low. Drive RE
high and DE low to enter low-power shutdown mode.
Driver Input. With DE high, a low on DI forces non-inverting
output low and inverting output high. Similarly, a high on DI
forces non-inverting output high and inverting output low.
Ground
4
7
GND
Ground
-
8
NC
5
9
Y
Non-inverting Driver Output
6
10
Z
Inverting Driver Output
7
11
B
Inverting Receiver Input
8
12
A
Non-inverting Receiver Input
-
13
NC
1
14
VCC
______
______
______
Not Connected
Not Connected
Positive Supply 3.135V ≤ VCC≤ 3.465V
Functions Tables
TRANSMITTING
______
RE
X
X
0
1
INPUTS
DE
1
1
0
0
OUTPUTS
DI
1
0
X
X
Z
0
1
High-Z
Y
1
0
High-Z
Shutdown
RECEIVING
______
RE
0
0
0
1
1
INPUTS
DE
X
X
X
1
0
A-B
≥-0.05V
≤-0.2V
Open/Short
X
X
OUTPUT
RO
1
0
1
High-Z
Shutdown
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UM3488/UM3491
Typical Operating Circuit
Figure 1: UM3491 pin configuration and typical full-duplex operating circuit
Figure 2: Typical Full-Duplex RS-422 Network
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UM3488/UM3491
Detailed Description
The UM3488/UM3491 high-speed transceivers for RS-422 communication contain one driver and
one receiver. The device features fail-safe circuitry, which guarantees a logic-high receiver output
when the receiver inputs are open or shorted, or when they are connected to a terminated
transmission line with all drivers disabled.
The UM3488/UM3491 offer higher driver output slew-rate limits, allowing transmit speeds up to
10Mbps.
The UM3488/UM3491 is full-duplex transceiver. It operates from a single +3.3V 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.
Receiver Input Filtering
The receivers of the UM3488/UM3491 incorporate input filtering in addition to input hysteresis.
This filtering enhances noise immunity with differential signals that have very slow rise and fall
times. Receiver propagation delay increases by 20% due to this filtering.
Fail-Safe
The UM3488/UM3491 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 UM3488/UM3491, 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-422 standard.
±15kV ESD Protection
As with all Union devices, ESD-protection structures are incorporated on all pins to protect
against electrostatic discharges encountered during handling and assembly. The driver outputs and
receiver inputs of the UM3488/UM3491 have extra protection against static electricity. Union’s
engineers have developed state-of-the-art structures to protect these pins against ESD of ±15kV
without damage.
The ESD-protected pins are tested with reference to the ground pin in a powered-down condition.
They are tested to ±15kV using the Human Body Model.
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UM3488/UM3491
Test Circuit
Y
VCC
S1
+
CRL
VOD
1K
Test Point
Receive
Output
R
15pF
R
1K
VOC
S2
Z
Figure 3. Driver DC Test Load
3V
DE
Z
RDIFF
VOD2
VCC
500ohm
Output
Under
Test
CL1
Y
DI
Figure 4. Receiver Enable/Disable Timing Test Load
CL
S1
+
S2
CL2
Figure 5. Driver Timing Test Circuit
3.3V
DI
1.5V
Z
3.3V
1.5V
tDPLH
0V
Figure 6. Driver Enable and Disable Timing Test Load
1/2VO
Y,Z
VOL
VO
Y
tDZL(SHDN), tDZL
2.3V
1/2VO
90％
10％
tDR
90％
Y,Z
10％
tSKEW=tDPLH-tDPHL
1V
A
-1V
B
OUTPUT
tDHZ
Figure 8. Driver Enable and Disable Times
3.3V
1.5V
VOH-0.5V
tDZH(SHDN), tDZH
tDF
RE
tRPHL
VOL+0.5V
2.3V
0
Figure 7. Driver Propagation Delays
VOH
RO
VOL
tDLZ
Output Normally Low
Output Normally High
VDIFF=V(Y)-V(Z)
VO
VDIFF 0
－VO
1.5V
1.5V
DE 0V
tDPHL
1.5V
1.5V
1.5V
0V
tRZL(SHDN), tRZL
VCC
1.5V
tRPLH
RO
INPUT
VOL+0.5V
Output Normally High
VOH-0.5V
1.5V
0
tRZH(SHDN), tRZH
Figure 9. Receiver Propagation Delays
tRLZ
Output Normally Low
tRHZ
Figure 10. Receiver Enable and Disable Times
A
RO
B
ATE
R
VD
A
R
RE
Receiver
Output
DATA IN
DE
Z
DI
Figure 11. Receiver Propagation Delay Test Circuit
120ohm
B
D
120ohm
Y
DATA OUT
Figure 12: Line Repeater
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UM3488/UM3491
Applications Information
256 Transceivers on the Bus
The standard RS-422 receiver input impedance is 12kΩ (one-unit load), and the standard driver
can drive up to 32 unit loads. The UM3491 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 and/or other RS-422 transceivers with a total of 32 unit loads or less
can be connected to the line.
Reduced EMI and Reflections
The UM3488/UM3491 is slew-rate limited, minimizing EMI and reducing reflections caused by
improperly terminated cables. Its high-frequency harmonic components are much lower in
amplitude, and the potential for EMI is significantly reduced.
In general, a transmitter’s rise time relates directly to the length of an unterminated stub, which
can be driven with only minor waveform reflections. The following equation expresses this
relationship conservatively:
Length = tRISE / (10 × 1.5ns/ft)
where tRISE is the transmitter’s rise time.
Low-Power Shutdown Mode (UM3491)
_____
Low-power shutdown mode is initiated by bringing both RE high and DE low. In shutdown, the
_____
devices typically draw only 1nA of supply current. RE and DE may be driven simultaneously;
_____
the parts are guaranteed not to enter shutdown if RE is high and DE is low for less than 50ns. If
the inputs are in this state for at least 600ns, the parts are guaranteed to enter shutdown.
Enable times t ZH and t ZL in the Switching Characteristics tables assume the part was not in a
low-power shutdown state. Enable times tZH(SHDN) and tZL(SHDN) assume the parts were shut down.
It takes drivers and receivers longer to become enabled from low-power shutdown mode (tZH(SHDN),
tZH(SHDN)) than from driver/receiver-disable mode (tZH, tZL).
Driver Output Protection
Two mechanisms prevent excessive output current and power dissipation caused by faults or by
bus contention. The first, a foldback current limit on the output stage, provides immediate
protection against short circuits over the whole common-mode voltage range. The second, a thermal shutdown circuit, forces the driver outputs into a high-impedance state if the die temperature
becomes excessive.
Line Length vs. Data Rate
The RS-422 standard covers line lengths up to 4000 feet. For line lengths greater than 4000 feet,
use the repeater application shown in Figure 12.
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UM3488/UM3491
Package Information
UM3488EESA SOP8
Outline Drawing
D
c
Symbol
1
2
θ
e
Top View
End View
b
Side View
A
A1
A2
b
c
D
E
E1
e
L
θ
DIMENSIONS
MILLIMETERS
INCHES
Min
Typ
Max
Min
Typ
Max
1.35
1.55
1.75
0.053 0.061 0.069
0.10
0.25
0.004
0.010
1.25
1.65
0.049
0.065
0.30
0.51
0.012
0.020
0.15
0.25
0.006
0.010
4.70
4.90
5.10
0.185 0.193 0.200
3.80
3.90
4.00
0.150 0.154 0.157
5.80
6.00
6.20
0.228 0.236 0.244
1.27BSC
0.050 BSC
0.40
1.27
0.016
0.050
0°
8°
0°
8°
Land Pattern
1.27
0.60
NOTES:
1. Compound dimension: 4.90×3.90;
2. Unit: mm;
3. General tolerance ±0.05mm unless
specified;
4. The layout is just for reference.
otherwise
Tape and Reel Orientation
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UM3488/UM3491
UM3488EEPA DIP8
Outline Drawing
Symbol
A
A1
A2
b
b1
c
D
E
E1
E2
e
L
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ
Max
3.71
4.80 0.146
0.189
0.38
0.015
3.20 3.40 3.60 0.126 0.134 0.142
0.38
0.57 0.015
0.022
1.52BSC
0.060BSC
0.20 0.28 0.36 0.008 0.011 0.014
9.00 9.20 9.50 0.354 0.362 0.374
6.20 6.40 6.60 0.244 0.252 0.260
7.32
7.92 0.288
0.312
8.40
9.05 0.331
0.356
2.54TYP
0.100TYP
3.00 3.30 3.60 0.118 0.130 0.142
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UM3488/UM3491
UM3491EESE SOP14
Outline Drawing
Symbol
A
A1
A2
b
c
D
E
E1
e
L
θ
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ
Max
1.35 1.60 1.75 0.053 0.063 0.069
0.10 0.15 0.25 0.004 0.006 0.010
1.25 1.45 1.65 0.049 0.057 0.065
0.36
0.49 0.014
0.019
0.17
0.25 0.007
0.010
8.53 8.63 8.73 0.336 0.340 0.344
3.80 3.90 4.00 0.150 0.154 0.157
5.80 6.00 6.20 0.228 0.236 0.244
1.27BSC
0.050BSC
0.45 0.60 0.80 0.018 0.024 0.031
0°
8°
0°
8°
Land Pattern
NOTES:
1. Compound dimension: 8.63×3.90 ;
2. Unit: mm;
3. General tolerance ±0.05mm unless otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
________________________________________________________________________
http://www.union-ic.com Rev.08 Feb.2021
15/17
UM3488/UM3491
UM3491EEPE DIP14
Outline Drawing
Symbol
D
E1
E2
Pin #1 ID
Top View
End View
e
b1
b
Side View
A
A1
A2
b
b1
c
D
E
E1
E2
e
L
DIMENSIONS
MILLIMETERS
INCHES
Min Typ Max Min
Typ
Max
3.71
4.80 0.146
0.189
0.50
0.020
3.05
3.60 0.120
0.142
0.38
0.57 0.015
0.022
1.52BSC
0.060BSC
0.20
0.36 0.008
0.014
18.80
19.40 0.740
0.764
6.20 6.40 6.60 0.244 0.252 0.260
7.32
8.25 0.288
0.325
7.62
10.90 0.300
0.429
2.54BSC
0.100BSC
2.92 3.30 3.81 0.115 0.130 0.150
________________________________________________________________________
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UM3488/UM3491
GREEN COMPLIANCE
Union Semiconductor is committed to environmental excellence in all aspects of its
operations including meeting or exceeding regulatory requirements with respect to the use
of hazardous substances. Numerous successful programs have been implemented to
reduce the use of hazardous substances and/or emissions.
All Union components are compliant with the RoHS directive, which helps to support
customers in their compliance with environmental directives. For more green compliance
information, please visit:
http://www.union-ic.com/index.aspx?cat_code=RoHSDeclaration
IMPORTANT NOTICE
The information in this document has been carefully reviewed and is believed to be
accurate. Nonetheless, this document is subject to change without notice. Union assumes
no responsibility for any inaccuracies that may be contained in this document, and makes
no commitment to update or to keep current the contained information, or to notify a
person or organization of any update. Union reserves the right to make changes, at any
time, in order to improve reliability, function or design and to attempt to supply the best
product possible.
Union Semiconductor, Inc
Add: Unit 606, No.570 Shengxia Road, Shanghai 201210
Tel: 021-51093966
Fax: 021-51026018
Website: www.union-ic.com
________________________________________________________________________
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17/17
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