-
天津京西科技发展有限公司
主营：232,485,接口芯片 - 13910252024
天津京西科技发展有限公司
主营：232,485,接口芯片
6
________________________________________________________________________
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)
Slew-
Rate
Limited
Low-
Power
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 2500pcs/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
________________________________________________________________________
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
PD
8-Pin SO (derate 9.09mW/°C above +70°C) 520
mW
8-Pin Plastic DIP (derate 9.09mW/°C above +70°C) 727
14-Pin Plastic DIP (derate 10.0mW/°C above +70°C) 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
________________________________________________________________________
UM3488/UM3491
Thermal Information
Symbol Thermal Metric Value UNIT
RθJA Junction to Ambient Thermal Resistance
SOP8 110
°C/W
SOP14 85
DIP8 87
DIP14 63
RθJC Junction to Case Thermal Resistance
SOP8 54
SOP14 42
DIP8 43
DIP14 37
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 Symbol Test Conditions Min Typ Max Unit
DRIVER
Differential Driver Output
(No Load)
VOD1 Figure 3
VCC V
Differential Driver Output VOD2 Figure 3, R = 50Ω 1.8
VCC V
Differential Driver Output VOD3 Figure 3, R = 27Ω 1.3
VCC V
Change-in-Magnitude of
Differential Output Voltage
(Note 2)
ΔVOD Figure 3, R = 50Ω
0.2 V
Driver Common-Mode
Output Voltage
VOC Figure 3, R = 50Ω
3.0 V
Input High Voltage VIH DE, DI, R E
______
2.0 V
Input Low Voltage VIL DE, DI, R E
______
0.8 V
DI Input Hysteresis VHYS
100
mV
Driver Short-Circuit Output
Current (Note 3)
VOD1
-7V≤VOUT≤VCC -250
mA
0V≤VOUT≤12V
250
RECEIVER
Input Current (A and B) IIN
DE = GND,
VCC = GND or
3.465V
VIN = 12V
125
μA
VIN = -7V
-75
Receiver Differential
Threshold Voltage
VTH -7V≤VCM≤12V -200 -125 -50 mV
________________________________________________________________________
UM3488/UM3491
Receiver Input Hysteresis ΔVTH 25 mV
Receiver Output High
Voltage
VOH IO = -4mA, VID = -50mV
VCC
-0.4
V
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 kΩ
Receiver Output Short Circuit
Current
IOSR 0V≤VRO ≤VCC ±7 ±95 mA
SUPPLY CURRENT
Supply Current ICC
No load,
DE
=DI=GND
or VCC
R E
______
=VCC 20 60
μA
R E
______
=GND
180 300
Supply Current in Shutdown
Mode
ISHDN DE = GND, VR E
______
= VCC
0.001 10 μA
ESD Protection for Y, Z, A, B
Human Body Model ±15 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.
________________________________________________________________________
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 Symbol Test Conditions Min Typ Max Unit
Driver Input-to-Output
tDPLH Figures 5 and 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
10 30 60
ns
tDPHL 10 30 60
Driver Output Skew
| tDPLH - tDPHL |
tDSKEW
Figures 5 and 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
10 25 ns
Driver Rise or Fall Time tDR, tDF
Figures 5 and 7, RDIFF = 54Ω,
CL1 = CL2 = 100pF
5 15 30 ns
Maximum Data Rate fMAX 10 Mbps
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≤15ns
20 100 180 ns
| tRPLH - tRPHL | Differential
Receiver Skew
tRSKD Figures 9 and 11; | VID | ≥2.0V;
rise and fall time of VID≤15ns
13 ns
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) 50 200 600 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
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.
________________________________________________________________________
UM3488/UM3491
Typical Operating Characteristics
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
No Load Supply Current vs.
Temperature
100
125
150
175
200
225
250
-60 -40 -20 0 20 40 60 80 100
Temperature(℃)
No Load Supply Current(μA)
RE=L,DE=H
Output Current vs.Receiver Output
High Voltage
0
5
10
15
20
25
30
0 1 2 3 4
Output High Voltage (V)
Output Current (μA)
Output Current vs. Receiver Output
Low Voltage
0
10
20
30
40
50
60
0 1 2 3 4
Output Low Voltage (V)
Output Current (μA)
Receiver Output High Voltage vs.
Temperature
2.5
2.55
2.6
2.65
2.7
2.75
2.8
2.85
2.9
2.95
3
-60 -40 -20 0 20 40 60 80 100
Temperature(℃)
Receiver Output High Voltage(V)
IRO=8mA
RE=L,DE=H
________________________________________________________________________
UM3488/UM3491
Typical Operating Characteristics (Continued)
(VCC = +3.3V, TA = +25°C, unless otherwise noted.)
Receiver Output Low Voltage vs.
Temperature
0.1
0.15
0.2
0.25
0.3
0.35
0.4
-60 -40 -20 0 20 40 60 80 100
Temperature(℃)
Receiver Output Low Voltage(V)
IRO=8mA
Driver Differential Output Voltage vs.
Temperature
1
1.1
1.2
1.3
1.4
1.5
1.6
1.7
1.8
1.9
2
-60 -40 -20 0 20 40 60 80 100
Temperature(℃)
Output Voltage(V)
RT=54ohm
Driver Output Current vs.Differential
Output Voltage
0.1
1
10
100
0 0.5 1 1.5 2 2.5 3 3.5
Differential Output Voltage (V)
Output Current (mA)
________________________________________________________________________
UM3488/UM3491
Pin Description
Pin Number
Symbol Function
UM3488 UM3491
- 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.
- 3 RE
______
Receiver Output Enable. Drive RE
______
low to enable RO; RO is
high impedance when RE
______
is high. Drive RE
______
high and DE
low to enter low-power shutdown mode.
- 4 DE
Driver Output Enable. Drive DE high to enable driver outputs.
These outputs are high impedance when DE is low. Drive RE
______
high and DE low to enter low-power shutdown mode.
3 5 DI
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.
4 6 GND Ground
4 7 GND Ground
- 8 NC Not Connected
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 Not Connected
1 14 VCC Positive Supply 3.135V ≤ VCC≤ 3.465V
Functions Tables
TRANSMITTING
INPUTS OUTPUTS
R E
______
DE DI Z Y
X 1 1 0 1
X 1 0 1 0
0 0 X High-Z High-Z
1 0 X Shutdown
RECEIVING
INPUTS OUTPUT
R E
______
DE A-B RO
0 X ≥-0.05V 1
0 X ≤-0.2V 0
0 X Open/Short 1
1 1 X High-Z
1 0 X Shutdown
________________________________________________________________________
UM3488/UM3491
Typical Operating Circuit
Figure 1: UM3491 pin configuration and typical full-duplex operating circuit
Figure 2: Typical Full-Duplex RS-422 Network
________________________________________________________________________
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 **s 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.
________________________________________________________________________
UM3488/UM3491
Test Circuit
Figure 3. Driver DC Test Load Figure 4. Receiver Enable/Disable Timing Test Load
Figure 5. Driver Timing Test Circuit Figure 6. Driver Enable and Disable Timing Test Load
Figure 7. Driver Propagation Delays Figure 8. Driver Enable and Disable Times
Figure 9. Receiver Propagation Delays Figure 10. Receiver Enable and Disable Times
Figure 11. Receiver Propagation Delay Test Circuit Figure 12: Line Repeater
Y
Z
R
R
VOD
VOC
1K
1K
VCC
S1
S2
+
CRL
15pF
Receive Test Point
Output
Z
DI Y
DE
3V
VOD2
CL1
CL2
RDIFF
+
CL
S1
S2
VCC
Output
Under
Test
500ohm
DI 0V
3.3V 1.5V
Z
Y
VO
1/2VO
tDPHL
1/2VO
1.5V
tDPLH
VDIFF 0
VO
－VO
10％ 90％ 90％ 10％
tDR tDF
VDIFF=V(Y)-V(Z)
tSKEW=tDPLH-tDPHL
1.5V 1.5V
DE 0V
3.3V
Y,Z
Y,Z
0
VOL
VOL+0.5V
VOH-0.5V
2.3V
2.3V
Output Normally Low
Output Normally High
tDZL(SHDN), tDZL
tDZH(SHDN), tDZH tDHZ
tDLZ
1.5V 1.5V
INPUT
A
B
1V
-1V
VOH
VOL
RO
OUTPUT
tRPHL tRPLH
RE 1.5V 1.5V
0V
3.3V
RO
0
VCC
VOL+0.5V
VOH-0.5V
1.5V
1.5V
Output Normally Low
Output Normally High
tRZL(SHDN), tRZL
tRZH(SHDN), tRZH tRHZ
tRLZ
ATE VD R
B
A
Receiver
Output
DI 120ohm
RO
R
D
Y
Z
B
A
120ohm
DATA IN
DATA OUT
RE
DE
________________________________________________________________________
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.
________________________________________________________________________
UM3488/UM3491
Package Information
UM3488EESA SOP8
Outline Drawing
D
e
1 2
Top View End View
b
Side View
θ
c
DIMENSIONS
Symbol
MILLIMETERS INCHES
Min Typ Max Min Typ Max
A 1.35 1.55 1.75 0.053 0.061 0.069
A1 0.10 - 0.25 0.004 - 0.010
A2 1.25 - 1.65 0.049 - 0.065
b 0.30 - 0.51 0.012 - 0.020
c 0.15 - 0.25 0.006 - 0.010
D 4.70 4.90 5.10 0.185 0.193 0.200
E 3.80 3.90 4.00 0.150 0.154 0.157
E1 5.80 6.00 6.20 0.228 0.236 0.244
e 1.27BSC 0.050 BSC
L 0.40 - 1.27 0.016 - 0.050
θ 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 otherwise
specified;
4. The layout is just for reference.
Tape and Reel Orientation
________________________________________________________________________
UM3488/UM3491
UM3488EEPA DIP8
Outline Drawing
DIMENSIONS
Symbol
MILLIMETERS INCHES
Min Typ Max Min Typ Max
A 3.71 - 4.80 0.146 - 0.189
A1 0.38 - - 0.015 - -
A2 3.20 3.40 3.60 0.126 0.134 0.142
b 0.38 - 0.57 0.015 - 0.022
b1 1.52BSC 0.060BSC
c 0.20 0.28 0.36 0.008 0.011 0.014
D 9.00 9.20 9.50 0.354 0.362 0.374
E 6.20 6.40 6.60 0.244 0.252 0.260
E1 7.32 - 7.92 0.288 - 0.312
E2 8.40 - 9.05 0.331 - 0.356
e 2.54TYP 0.100TYP
L 3.00 3.30 3.60 0.118 0.130 0.142
________________________________________________________________________
UM3488/UM3491
UM3491EESE SOP14
Outline Drawing
DIMENSIONS
Symbol
MILLIMETERS INCHES
Min Typ Max Min Typ Max
A 1.35 1.60 1.75 0.053 0.063 0.069
A1 0.10 0.15 0.25 0.004 0.006 0.010
A2 1.25 1.45 1.65 0.049 0.057 0.065
b 0.36 - 0.49 0.014 - 0.019
c 0.17 - 0.25 0.007 - 0.010
D 8.53 8.63 8.73 0.336 0.340 0.344
E 3.80 3.90 4.00 0.150 0.154 0.157
E1 5.80 6.00 6.20 0.228 0.236 0.244
e 1.27BSC 0.050BSC
L 0.45 0.60 0.80 0.018 0.024 0.031
θ 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
________________________________________________________________________
UM3488/UM3491
UM3491EEPE DIP14
Outline Drawing
Side View
Top View End View
Pin #1 ID
e
b1
b
E1
E2
D
DIMENSIONS
Symbol
MILLIMETERS INCHES
Min Typ Max Min Typ Max
A 3.71 - 4.80 0.146 - 0.189
A1 0.50 - - 0.020 - -
A2 3.05 - 3.60 0.120 - 0.142
b 0.38 - 0.57 0.015 - 0.022
b1 1.52BSC 0.060BSC
c 0.20 - 0.36 0.008 - 0.014
D 18.80 - 19.40 0.740 - 0.764
E 6.20 6.40 6.60 0.244 0.252 0.260
E1 7.32 - 8.25 0.288 - 0.325
E2 7.62 - 10.90 0.300 - 0.429
e 2.54BSC 0.100BSC
L 2.92 3.30 3.81 0.115 0.130 0.150
________________________________________________________________________
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:
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.
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