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PDF LTC1690 Data sheet ( Hoja de datos )
| Número de pieza | LTC1690 | |
| Descripción | Differential Driver and Receiver Pair with Fail-Safe Receiver Output | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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LTC1690
Differential Driver and
Receiver Pair with Fail-Safe
Receiver Output
FEATURES
s No Damage or Latchup to ±15kV ESD (Human Body
Model), IEC1000-4-2 Level 4 (±8kV) Contact and
Level 3 (±8kV) Air Discharge
s Guaranteed High Receiver Output State for
Floating, Shorted or Terminated Inputs with No
Signal Present
s Drives Low Cost Residential Telephone Wires
s ICC = 600µA Max with No Load
s Single 5V Supply
s –7V to 12V Common Mode Range Permits ±7V
Ground Difference Between Devices on the Data Line
s Power-Up/Down Glitch-Free Driver Outputs Permit
Live Insertion or Removal of Transceiver
s Driver Maintains High Impedance with the Power Off
s Up to 32 Transceivers on the Bus
s Pin Compatible with the SN75179 and LTC490
s Available in SO, MSOP and PDIP Packages
U
APPLICATIO S
s Battery-Powered RS485/RS422 Applications
s Low Power RS485/RS422 Transceiver
s Level Translator
s Line Repeater
DESCRIPTIO
The LTC®1690 is a low power receiver/driver pair that is
compatible with the requirements of RS485 and RS422.
The receiver offers a fail-safe feature that guarantees a
high receiver output state when the inputs are left open,
shorted together or terminated with no signal present. No
external components are required to ensure the high
receiver output state.
Separate driver output and receiver input pins allow full
duplex operation. Excessive power dissipation caused by
bus contention or faults is prevented by a thermal shut-
down circuit which forces the driver outputs into a high
impedance state.
The LTC1690 is fully specified over the commercial and
industrial temperature ranges. The LTC1690 is available in
8-Pin SO, MSOP and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
3
D1
LTC1690
DRIVER
5 Y1
120Ω
6
Z1
2
R1
RECEIVER
7 B1
120Ω
8
A1
A2
120Ω
B2
8
7
LTC1690
RECEIVER
2
R2
Z2
120Ω
Y2
6
5
DRIVER
3
D2
1690 TA01
Driving a 1000 Foot STP Cable
D1
B2
A2
R2
1690 TA01a
1
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
Receiver Short-Circuit Current vs
Temperature
70
VCC = 5.25V
60
OUTPUT LOW
50
40
30
OUTPUT HIGH
20
10
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G13
Driver Differential Output Voltage
vs Temperature
2.9
RL = 44Ω
2.7
2.5 VCC = 5.25V
VCC = 5V
2.3
2.1
1.9
VCC = 4.5V
1.7 VCC = 4.75V
1.5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G16
Driver Common Mode Output
Voltage vs Temperature
3.0
2.5
VCC = 5.25V
2.0 VCC = 5V
VCC = 4.75V
1.5 VCC = 4.5V
1.0
0.5
RL = 44Ω
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G19
Supply Current vs Temperature
340
320
300
280 VCC = 5.25V
260
240
220 VCC = 4.75V
200
180 VCC = 5V
160
140
120
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G14
Driver Differential Output Voltage
vs Temperature
2.9
2.7 VCC = 5.25V
RL = 54Ω
VCC = 5V
2.5
2.3
2.1
VCC = 4.5V
1.9 VCC = 4.75V
1.7
1.5
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G17
Driver Common Mode Output
Voltage vs Temperature
3.0
2.5
VCC = 5.25V
2.0 VCC = 5V
VCC = 4.75V
1.5 VCC = 4.5V
1.0
0.5
RL = 54Ω
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G20
LTC1690
Logic Input Threshold Voltage vs
Temperature
1.75
1.70 VCC = 5.25V
1.65
VCC = 5V
1.60
1.55 VCC = 4.75V
1.50
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G15
Driver Differential Output Voltage
vs Temperature
3.4
RL = 100Ω
3.2
VCC = 5.25V
3.0
VCC = 5V
2.8
VCC = 4.75V
2.6 VCC = 4.5V
2.4
2.2
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G18
Driver Common Mode Output
Voltage vs Temperature
3.0
2.5
2.0 VCC = 5.25V VCC = 5V
VCC = 4.75V
1.5 VCC = 4.5V
1.0
0.5
RL = 100Ω
0
–55 –35 –15 5 25 45 65 85 105 125
TEMPERATURE (°C)
1690 G21
5
5 Page 
LTC1690
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
MS8 Package
8-Lead Plastic MSOP
(LTC DWG # 05-08-1660)
0.007
(0.18)
0° – 6° TYP
0.021 ± 0.006
(0.53 ± 0.015)
0.040 ± 0.006
(1.02 ± 0.15)
SEATING
PLANE
0.012
(0.30)
REF
0.0256
(0.65)
BSC
0.034 ± 0.004
(0.86 ± 0.102)
0.006 ± 0.004
(0.15 ± 0.102)
* DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH,
PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
0.118 ± 0.004*
(3.00 ± 0.102)
0.193 ± 0.006
(4.90 ± 0.15)
8 76 5
0.118 ± 0.004**
(3.00 ± 0.102)
MSOP (MS8) 1098
1 234
0.300 – 0.325
(7.620 – 8.255)
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.400*
(10.160)
MAX
87 65
0.009 – 0.015
(0.229 – 0.381)
0.065
(1.651)
TYP
+0.035
0.325 –0.015
( )8.255
+0.889
–0.381
0.100
(2.54)
BSC
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.125
(3.175)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.020
(0.508)
MIN
0.255 ± 0.015*
(6.477 ± 0.381)
12
34
N8 1098
S8 Package
8-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0.053 – 0.069
(1.346 – 1.752)
0°– 8° TYP
0.016 – 0.050
(0.406 – 1.270)
0.014 – 0.019
(0.355 – 0.483)
TYP
*DIMENSION DOES NOT INCLUDE MOLD FLASH. MOLD FLASH
SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE
**DIMENSION DOES NOT INCLUDE INTERLEAD FLASH. INTERLEAD
FLASH SHALL NOT EXCEED 0.010" (0.254mm) PER SIDE
0.004 – 0.010
(0.101 – 0.254)
0.050
(1.270)
BSC
0.228 – 0.244
(5.791 – 6.197)
0.189 – 0.197*
(4.801 – 5.004)
8 765
1 2 34
0.150 – 0.157**
(3.810 – 3.988)
SO8 1298
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.
11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LTC1690.PDF ] | |
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