STMICROELECTRONICS ST490ABN

ST490A
Low power high speed
RS-485/RS-422 transceiver
General features
■
■
Low supply current: 5mA max
-7V to 12V common mode input voltage range
■
70mV tipycal input hysteresis
■
Designed for 25Mbps operation
■
Operate from a single 5V supply
■
±4kV ESD protection
■
Current limiting and thermal shutdown for
driver overload protection
DIP-8
SO-8
Description
The ST490A is a low power transceiver for RS485 and RS-422 communications. The device
contains one driver and one receiver in full duplex
configuration. The ST490A draws 5mA (typ.) of
supply current when unloaded or fully loaded with
disabled drivers. It operates from a single 5V
supply.
Driver is short-circuit current limited and is
protected against excessive power dissipation by
thermal shutdown circuitry that place the driver
outputs into a high-impedance state. The receiver
input has a fail-safe feature that guarantees a
logic high output if both inputs are open circuit.
Order code
Part number
Temperature range
Package
Packaging
ST490ACN
0 to 70 °C
DIP-8
50parts per tube / 40tube per box
ST490ABN
-40 to 85 °C
DIP-8
50parts per tube / 40tube per box
ST490ACDR
0 to 70 °C
SO-8 (Tape & Reel)
2500 parts per reel
ST490ABDR
-40 to 85 °C
SO-8 (Tape & Reel)
2500 parts per reel
May 2006
Rev 3
1/17
www.st.com
17
Contents
ST490A
Contents
1
Pin configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2
Truth tables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
3
Maximum ratings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
4
Electrical characteristics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
5
Test circuit and typical characteristics
6
Package mechanical data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12
7
Revision history . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16
2/17
......................... 8
ST490A
Pin configuration
1
Pin configuration
Figure 1.
Pin connections
Table 1.
Pin description
Pin n°
Symbol
Name and function
1
VCC
Supply voltage
2
RO
Receiver output
3
DI
Driver input
4
GND
5
Y
Non-inverting driver output
6
Z
Inverting driver output
7
B
Inverting receiver input
8
A
Non-inverting receiver input
Ground
3/17
Truth tables
ST490A
2
Truth tables
Table 2.
Truth table (driver)
Inputs
DI
Y
Z
L
L
H
H
H
L
Note:
X = Don’t care; Z = High impedance
Table 3.
Truth table (receiver)
Note:
4/17
Outputs
Differential inputs
Outputs
A-B
RO
≥ -0.2V
H
between -0.2V to 0.2V
?
≤ -0.2V
L
OPEN
H
X = Don’t care; Z = High impedance
ST490A
Maximum ratings
3
Maximum ratings
Table 4.
Absolute maximum ratings
Symbol
Parameter
VCC
Supply voltage
VDI
Driver input voltage
Value
Unit
7
V
-0.5 to 7
V
VY, VZ
Driver output voltage
-7.5 to 12.5
V
VA, VB
Receiver input voltage
-7.5 to 12.5
V
VRO
Receiver output voltage
-0.3 to (VCC + 0.3)
V
ESD
Human body model
3.5
KV
Note:
Absolute maximum ratings are those values beyond which damage to the device may occur.
Functional operation under these condition is not implied.
5/17
Electrical characteristics
ST490A
4
Electrical characteristics
Table 5.
Electrical characteristics
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA=25°C)
Symbol
ISUPPLY
Parameter
Min.
No load supply current
Typ.
Max.
Unit
2
5
mA
CIN
Input capacitance
1.8
pF
CYZ
Driver output capacitance
1.2
pF
Output capacitance
2.3
pF
COUT
Table 6.
Transmitter electrical characteristics
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA=25°C)
Symbol
Parameter
VOD1
Differential drive output (no load)
VOD2
Differential drive output (with
load)
RL= 54Ω (RS-422) (Figure 1.)
1.5
2.6
VOD3
Differential drive output (with
load)
RL= 100Ω (RS-422) (Figure 1.)
2
3
∆VOD
Change in magnitude of driver
differential output voltage for
complementary output states
RL= 54Ω or 100Ω (Figure 1.)
Driver common mode output
voltage
RL= 54Ω (Figure 1.)
∆VOC
Change in magnitude of driver
common mode output voltage
RL= 54Ω (Figure 1.)
IOFF
Power off output current
VCC = 0V, VO=-7V to 12V
IOSD
Driver short circuit output current VO=-7V to 12V
VOC
6/17
VIL
Input logic threshold low
VIH
Input logic threshold high
Test conditions
Min.
Typ.
0
1
0
± 35
2
Max.
Unit
VCC
V
5
V
V
0.2
V
3
V
0.2
V
± 100
µA
± 250
mA
0.8
V
V
ST490A
Table 7.
Symbol
Electrical characteristics
Receiver electrical characteristics
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA=25°C)
Parameter
Test Conditions
Min.
IIN1
Logic input current
IIN2
Input current (A, B)
VTH
Receiver differential threshold
voltage
VCM = -7V to 12V
∆VTH
Receiver input hysteresis
VCM = 0V
VOH
Receiver output high voltage
IOUT = -8mA, VID = 200mV
VOL
Receiver output low voltage
IOUT = 8mA, VID = -200mV
RRIN
Receiver input resistance
VCM = -7V to 12V
12
IOSR
Receiver short-circuit current
VO = 0V to VCC
7
Table 8.
Symbol
Other input=0V
VCC= 0 or 5.25V
Typ.
Max.
Unit
± 2.0
µA
VIN=12V
0.5
1
mA
VIN=-7V
-0.35
-0.8
mA
0.2
V
-0.2
3.5
70
mV
4.7
V
0.2
0.4
24
V
KΩ
95
mA
Driver switching characteristics
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA=25°C)
Parameter
Test Conditions
Min.
Typ.
25
50
Max.
Unit
DR
Maximum data rate
Jitter <5%
tPLH
tPHL
Propagation delay input
to output
RL= 54Ω, CL1=CL2=50pF, (Figure 1.)
10
16
ns
tSKEW
Differential output delay
skew
RL= 54Ω, CL1=CL2=50pF, (Figure 1.)
1
3
ns
Rise or fall differential
time
RL= 54Ω, CL1=CL2=50pF, (Figure 1.)
8
12
ns
tTLH
tTHL
Table 9.
Symbol
Mbps
Receiver Switching Characteristics
(VCC = 4.5V to 5.5V, TA = -40 to 85°C, unless otherwise specified. Typical values are
referred to TA=25°C)
Parameter
Test Conditions
Min.
Typ.
Max.
Unit
tPLH
tPHL
Propagation delay input
to output
CL = 15pF, (Figure 2., Figure 4.)
19
30
ns
tSKD
|tPLH - tPHL| Receiver
output skew
CL = 15pF, (Figure 2., Figure 4.)
1
3
ns
tTLH
tTHL
Rise or fall time
CL = 15pF, (Figure 2., Figure 4.)
8
ns
7/17
Test circuit and typical characteristics
5
Test circuit and typical characteristics
Figure 2.
Driver DC test load
Figure 3.
Drive/receiver timing test circuit
8/17
ST490A
ST490A
Test circuit and typical characteristics
Figure 4.
Driver propagation delay
Figure 5.
Receiver propagation delay
9/17
Test circuit and typical characteristics
ST490A
Figure 6.
Receiver output current vs. output
low voltage(output low)
Figure 8.
Driver diff. output voltage vs
Figure 9.
common mode voltage (diff. output
low)
Figure 10. driver short circuit current vs line
voltage (output high)
10/17
Figure 7.
Receiver output current vs. output
high voltage (output high)
Driver diff. output voltage vs
common mode voltage (diff. output
high)
Figure 11. Receiver high level output voltage
vs. temperature
ST490A
Test circuit and typical characteristics
Figure 12. Receiver input current vs input
voltage
11/17
Package mechanical data
6
ST490A
Package mechanical data
In order to meet environmental requirements, ST offers these devices in ECOPACK®
packages. These packages have a Lead-free second level interconnect. The category of
second level interconnect is marked on the package and on the inner box label, in
compliance with JEDEC Standard JESD97. The maximum ratings related to soldering
conditions are also marked on the inner box label. ECOPACK is an ST trademark.
ECOPACK specifications are available at: www.st.com
12/17
ST490A
Package mechanical data
Plastic DIP-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
3.3
TYP.
MAX.
0.130
a1
0.7
B
1.39
1.65
0.055
0.065
B1
0.91
1.04
0.036
0.041
b
b1
0.028
0.5
0.38
0.020
0.5
D
0.015
0.020
9.8
0.386
E
8.8
0.346
e
2.54
0.100
e3
7.62
0.300
e4
7.62
0.300
F
7.1
0.280
I
4.8
0.189
L
Z
3.3
0.44
0.130
1.6
0.017
0.063
P001F
13/17
Package mechanical data
ST490A
SO-8 MECHANICAL DATA
DIM.
mm.
MIN.
TYP
inch
MAX.
MIN.
TYP.
MAX.
A
1.35
1.75
0.053
0.069
A1
0.10
0.25
0.04
0.010
A2
1.10
1.65
0.043
0.065
B
0.33
0.51
0.013
0.020
C
0.19
0.25
0.007
0.010
D
4.80
5.00
0.189
0.197
E
3.80
4.00
0.150
0.157
e
1.27
0.050
H
5.80
6.20
0.228
0.244
h
0.25
0.50
0.010
0.020
L
0.40
1.27
0.016
0.050
k
ddd
8° (max.)
0.1
0.04
0016023/C
14/17
ST490A
Package mechanical data
Tape & Reel SO-8 MECHANICAL DATA
mm.
inch
DIM.
MIN.
A
TYP
MAX.
MIN.
330
MAX.
12.992
C
12.8
D
20.2
0.795
N
60
2.362
T
13.2
TYP.
0.504
22.4
0.519
0.882
Ao
8.1
8.5
0.319
0.335
Bo
5.5
5.9
0.216
0.232
Ko
2.1
2.3
0.082
0.090
Po
3.9
4.1
0.153
0.161
P
7.9
8.1
0.311
0.319
15/17
Revision history
ST490A
7
Revision history
Table 10.
Revision history
Date
Revision
06-Jul-2005
2
Typing error on table 2 - pin 5 non-inverting, pin 6 inverting.
04-May-2006
3
Order codes has been updated and new template.
16/17
Changes
ST490A
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