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PDF LTC1519 Data sheet ( Hoja de datos )
| Número de pieza | LTC1519 | |
| Descripción | 52Mbps Precision Delay RS485 Quad Line Receivers | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC1519 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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FEATURES
s Precision Propagation Delay: 18.5ns ±3.5ns Over
0°C to 70°C Temperature Range
s High Data Rate: 52Mbps
s Low tPLH/tPHL Skew: 500ps Typ
s Low Channel-to-Channel Skew: 500ps Typ
s Guaranteed Fail-Safe Operation over the Entire
Common Mode Range
s –7V to 12V RS485 Input Common Mode Range
s Input Resistance ≥ 22k, Even When Unpowered
s Hot SwapTM Capable
s High Common Mode Rejection to 26MHz
s Short-Circuit Protection: 10mA Typ Output Current
for an Indefinite Short
s Three-State Output Capability
s Will Not Oscillate with Slow Moving Input Signals
s Single 5V Supply
s Pin Compatible with LTC488, LTC489
U
APPLICATIO S
s High Speed RS485/RS422 Receivers
s STS-1/OC-1 Data Receivers
s PECL Line Receivers
s Level Translators
s Fast-20/Fast-40 SCSI Receiver
, LTC and LT are registered trademarks of Linear Technology Corporation.
Hot Swap is a trademark of Linear Technology Corporation.
LTC1518/LTC1519
52Mbps Precision Delay
RS485 Quad Line Receivers
DESCRIPTIO
The LTC®1518/LTC1519 are high speed, precision delay
differential quad bus/line receivers that can operate at data
rates as high as 52Mbps. They are pin compatible with the
LTC488/LTC489 RS485 line receivers and operate over the
entire – 7V to 12V common mode range. A unique architec-
ture provides very stable propagation delays and low skew
over wide input common mode, input overdrive and ambi-
ent temperature ranges. Propagation delay is 18.5ns ± 3.5ns
over the commercial temperature range. Typical tPLH/tPHL
and channel-to-channel skew is 500ps.
Each receiver translates differential input levels (VID ≥
300mV) into valid CMOS and TTL output levels. Its high
input resistance (≥ 22k) allows many receivers to be con-
nected to the same driver. The receiver outputs go into a
high impedance state when disabled.
The receivers have a fail-safe feature that guarantees a high
output state when the inputs are shorted or left floating.
Other protection features include thermal shutdown and a
controlled maximum short-circuit current (50mA Max).
Input resistance remains ≥ 22k when the device is
unpowered or disabled, thus allowing hot swapping with-
out loading the data lines.
The LTC1518/LTC1519 operate from a single 5V supply
and draw 12mA of supply current.
TYPICAL APPLICATIO
52Mbps Data Communication over Twisted Pair
RE
2
RO 1
DI 4
7
6
3
DE
LTC1685
100Ω
100Ω
EN 4 A 1
EN
12
2B
1/4 LTC1518
3
RO
RE
2
1 RO
7
6
3
4 DI
DE
LTC1685
1518/19 F08
Propagation Delay Guaranteed to Fall
Within Shaded Area (±3.5ns)
TA = 0°C TO 70°C
VIN =
3V/DIV
VOUT =
5V/DIV
RECEIVER
OUTPUT
VDD = 5V
RECEIVER
INPUT
VID = 1.5V
–5 0
5 10 15 20 25 30 35 40 45
TIME (ns)
1518/19 TA02
1
1 page  
LTC1518/LTC1519
PI FU CTIO S
LTC1518
B1 (Pin 1): Receiver 1 Inverting Input.
A1 (Pin 2): Receiver 1 Noninverting Input.
OUT 1 (Pin 3): Receiver 1 Output.
EN (Pin 4): A high enables all outputs; a low on Pin 4 and
a high on Pin 12 will put all outputs into a high impedance
state. Do not float.
OUT 2 (Pin 5): Receiver 2 Output.
A2 (Pin 6): Receiver 2 Noninverting Input.
B2 (Pin 7): Receiver 2 Inverting Input.
GND (Pin 8): Ground Pin. A ground plane is recommended
for all LTC1518 applications.
B3 (Pin 9): Receiver 3 Inverting Input.
A3 (Pin 10): Receiver 3 Noninverting Input.
OUT 3 (Pin 11): Receiver 3 Output.
EN (Pin 12): A low enables all outputs; a low on Pin 4 and
a high on Pin 12 will put all outputs into a high impedance
state. Do not float.
OUT 4 (Pin 13): Receiver 4 Output.
A4 (Pin 14): Receiver 4 Noninverting Input.
B4 (Pin 15): Receiver 4 Inverting Input.
VDD (Pin 16): Power Supply Input. This pin should be
decoupled with a 0.1µF ceramic capacitor as close as
possible to the pin. Recommended: VDD = 5V ±5%.
LTC1519
B1 (Pin 1): Receiver 1 Inverting Input.
A1 (Pin 2): Receiver 1 Noninverting Input.
OUT 1 (Pin 3): Receiver 1 Output.
EN12 (Pin 4): A high enables receivers 1 and 2; a low will
put the outputs of receivers 1 and 2 into a high impedance
state. Do not float.
OUT 2 (Pin 5): Receiver 2 Output.
A2 (Pin 6): Receiver 2 Noninverting Input.
B2 (Pin 7): Receiver 2 Inverting Input.
GND (Pin 8): Ground Pin. A ground plane is recommended
for all LTC1519 applications.
B3 (Pin 9): Receiver 3 Inverting Input.
A3 (Pin 10): Receiver 3 Noninverting Input.
OUT 3 (Pin 11): Receiver 3 Output.
EN34 (Pin 12): A high enables receivers 3 and 4; a low will
put the outputs of receivers 3 and 4 into a high impedance
state. Do not float.
OUT 4 (Pin 13): Receiver 4 Output.
A4 (Pin 14): Receiver 4 Noninverting Input.
B4 (Pin 15): Receiver 4 Inverting Input.
VDD (Pin 16): Power Supply Input. This pin should be
decoupled with a 0.1µF ceramic capacitor as close as
possible to the pin. Recommended: VDD = 5V ±5%.
5
5 Page 
LTC1518/LTC1519
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
S Package
16-Lead Plastic Small Outline (Narrow 0.150)
(LTC DWG # 05-08-1610)
0.386 – 0.394*
(9.804 – 10.008)
16 15 14 13 12 11 10 9
0.228 – 0.244
(5.791 – 6.197)
0.150 – 0.157**
(3.810 – 3.988)
0.010
(0.254
–
–
0.020
0.508)
×
45°
0.008 – 0.010
(0.203 – 0.254)
0° – 8° TYP
1 2 34 5 6 7 8
0.053 – 0.069
(1.346 – 1.752)
0.004 – 0.010
(0.101 – 0.254)
0.016 – 0.050
(0.406 – 1.270)
*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
0.014 – 0.019
(0.355 – 0.483)
TYP
0.050
(1.270)
BSC
S16 1098
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 LTC1519.PDF ] | |
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