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PDF LTC490 Data sheet ( Hoja de datos )
| Número de pieza | LTC490 | |
| Descripción | Differential Driver and Receiver Pair | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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FEATURES
s Low Power: ICC = 300µA Typical
s Designed for RS485 or RS422 Applications
s Single 5V Supply
s – 7V to 12V Bus Common Mode Range
Permits ±7V Ground Difference Between Devices
on the Bus
s Thermal Shutdown Protection
s Power-Up/-Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Package
s Driver Maintains High Impedance with the
Power Off
s Combined Impedance of a Driver Output and
Receiver Allows up to 32 Transceivers on the Bus
s 70mV Typical Input Hysteresis
s 28ns Typical Driver Propagation Delays with
5ns Skew for 2.5MB Operation
s Pin Compatible with the SN75179
s Available in 8-Lead PDIP and SO Packages
U
APPLICATIO S
s Low Power RS485/RS422 Transceiver
s Level Translator
LTC490
Differential Driver and
Receiver Pair
DESCRIPTIO
The LTC®490 is a low power differential bus/line trans-
ceiver designed for multipoint data transmission standard
RS485 applications with extended common mode range
(12V to –7V). It also meets the requirements of RS422.
The CMOS design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload or ESD damage.
Excessive power dissipation caused by bus contention or
faults is prevented by a thermal shutdown circuit which
forces the driver outputs into a high impedance state. The
receiver has a fail safe feature which guarantees a high
output state when the inputs are left open.
Both AC and DC specifications are guaranteed from 0°C to
70°C and 4.75V to 5.25V supply voltage range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
LTC490
3
D
DRIVER
2
R
RECEIVER
5
120Ω
6
4000 FT BELDEN 9841
120Ω
8
120Ω
7
120Ω
4000 FT BELDEN 9841
LTC490
RECEIVER
R
DRIVER
D
LTC490 • TA01
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1
1 page  
PI FU CTIO S
VCC (Pin 1): Positive Supply; 4.75V ≤ VCC ≤ 5.25V.
R (Pin 2): Receiver Output. If A > B by 200mV, R will be
high. If A < B by 200mV, then R will be low.
D (Pin 3): Driver Input. A low on D forces the driver outputs
Y low and Z high. A high on D will force Y high and Z low.
GND (Pin 4): Ground Connection.
Y (Pin 5): Driver Output.
Z (Pin 6): Driver Output.
B (Pin 7): Receiver Input.
A (Pin 8): Receiver Input.
LTC490
TEST CIRCUITS
Y
VOD2
Z
R
R VOC
LTC490 • F01
Figure 1. Driver DC Test Load
Y
D
DRIVER
RDIFF
Z
CL1 A
RECEIVER
CL2 B
R
15pF
LTC490 • F02
Figure 2. Driver/Receiver Timing Test Circuit
UW
W
SWITCHI G TI E WAVEFOR S
3V
D
0V
VO
–VO
Z
VO
Y
1.5V
tPLH
50%
10%
tr
1/2 VO
80%
tSKEW
f = 1MHz : tr ≤ 10ns : tf ≤ 10ns
VDIFF = V(Y) – V(Z)
1.5V
tPHL
90% 50%
20%
tf
Figure 3. Driver Propagation Delays
1/2 VO
tSKEW
LTC490 • F03
VOD2
A-B
–VOD2
VOH
R
VOL
0V
tPLH
1.5V
INPUT
f = 1MHz ; tr ≤ 10ns : tf ≤ 10ns
OUTPUT
Figure 4. Receiver Propagation Delays
0V
tPHL
1.5V
LTC490 • F04
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5 Page 
PACKAGE DESCRIPTIO
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
.050 BSC
.045 ±.005
.189 – .197
(4.801 – 5.004)
NOTE 3
8 765
LTC490
.245
MIN .160 ±.005
.228 – .244
(5.791 – 6.197)
.150 – .157
(3.810 – 3.988)
NOTE 3
.030 ±.005
TYP
RECOMMENDED SOLDER PAD LAYOUT
.010
(0.254
–
–
.020
0.508)
×
45°
.008 – .010
(0.203 – 0.254)
0°– 8° TYP
1
.053 – .069
(1.346 – 1.752)
2
.016 – .050
(0.406 – 1.270)
NOTE:
1. DIMENSIONS
IN
INCHES
(MILLIMETERS)
.014 – .019
(0.355 – 0.483)
TYP
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
34
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
SO8 0303
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
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11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC490.PDF ] | |
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