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PDF LTC488 Data sheet ( Hoja de datos )
| Número de pieza | LTC488 | |
| Descripción | Quad RS485 Line Receiver | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de LTC488 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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LTC488/LTC489
Quad RS485 Line Receiver
FEATURES
s Low Power: ICC = 7mA Typ
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 60mV Typical Input Hysteresis
s Receiver Maintains High Impedance in Three-State or
with the Power Off
s 28ns Typical Receiver Propagation Delay
s Pin Compatible with the SN75173 (LTC488)
s Pin Compatible with the SN75175 (LTC489)
APPLICATI S
s Low Power RS485/RS422 Receivers
s Level Translator
DESCRIPTIO
The LTC®488 and LTC489 are low power differential bus/
line receivers designed for multipoint data transmission
standard RS485 applications with extended common mode
range (12V to – 7V). They also meet the requirements of
RS422.
The CMOS design offers significant power savings over its
bipolar counterpart without sacrificing ruggedness against
overload or ESD damage.
The receiver features three-state outputs, with the receiver
output maintaining high impedance over the entire com-
mon mode range.
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 4.75V to
5.25V supply voltage range.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATI
EN EN
DRIVER
DI 1/4 LTC486
EN12
DRIVER
DI 1/4 LTC487
EN EN
120Ω
120Ω
24
12
RECEIVER
1 1/4 LTC488
3
RO
4000 FT 24 GAUGE TWISTED PAIR
120Ω
EN12
24
RECEIVER 3
120Ω 1 1/4 LTC489
RO
4000 FT 24 GAUGE TWISTED PAIR
LTC488/9 TA01
1
1 page  
UU
FU CTIO TABLES
LTC488
DIFFERENTIAL
A–B
VID ≥ 0.2V
–0.2V < VID < 0.2V
VID ≤ 0.2V
X
ENABLES
EN EN
HX
XL
HX
XL
HX
XL
LH
OUTPUT
RO
H
H
?
?
L
L
Z
LTC489
DIFFERENTIAL
A–B
VID ≥ 0.2V
–0.2V < VID < 0.2V
VID ≤ 0.2V
X
H: High Level
L: Low Level
X: Irrelevant
LTC488/LTC489
ENABLES
OUTPUT
EN12 or EN34
RO
HH
H?
HL
LZ
?: Indeterminate
Z: High Impedance (Off)
TEST CIRCUITS
100pF
A
D DRIVER
54Ω
100pF
RECEIVER
B
RO
CL
488/9 F01
Figure 1. Receiver Timing Test Circuit
Note: The input pulse is supplied by a generator having the following characteristics:
f = 1MHz, Duty Cycle = 50%, tr < 10ns, tf ≤ 10ns, ZOUT = 50Ω
RECEIVER
OUTPUT
S1 1k
VCC
CL 1k
S2
488/9 F02
Figure 2. Receiver Enable and Disable Timing Test Circuit
5
5 Page 
LTC488/LTC489
U
PACKAGE DESCRIPTIO Dimensions in inches (millimeters) unless otherwise noted.
SW Package
16-Lead Plastic Small Outline (Wide 0.300)
(LTC DWG # 05-08-1620)
0.398 – 0.413*
(10.109 – 10.490)
16 15 14 13 12 11 10 9
NOTE 1
0.394 – 0.419
(10.007 – 10.643)
0.291 – 0.299**
(7.391 – 7.595)
0.010
(0.254
–
–
0.029
0.737)
×
45°
123 45678
0.093 – 0.104
(2.362 – 2.642)
0.037 – 0.045
(0.940 – 1.143)
0° – 8° TYP
0.050
0.009 – 0.013
(0.229 – 0.330)
NOTE:
NOTE 1
0.016 – 0.050
(0.406 – 1.270)
(1.270)
TYP
0.014 – 0.019
(0.356 – 0.482)
TYP
1. PIN 1 IDENT, NOTCH ON TOP AND CAVITIES ON THE BOTTOM OF PACKAGES ARE THE MANUFACTURING OPTIONS.
THE PART MAY BE SUPPLIED WITH OR WITHOUT ANY OF THE OPTIONS
*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 – 0.012
(0.102 – 0.305)
S16 (WIDE) 0396
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 LTC488.PDF ] | |
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