OMO ElectronicOMO Electronic
Expand menu
Hello, Sign inMy Account
0 Cart

LTC1520CS#PBF

P1-P3P4-P6P7-P8
1
LTC1520
50Mbps Precision Quad
Line Receiver
DESCRIPTION
U
■
Precision Propagation Delay: 18ns ±3ns Over
Temperature
■
Data Rate: 50Mbps
■
Low t
PLH
/t
PHL
Skew: 500ps Typ
■
Low Channel-to-Channel Skew: 400ps Typ
■
Rail-to-Rail Input Common Mode Range
■
High Input Resistance: ≥18k, Even When Unpowered
■
Hot Swap Capable
■
Can Withstand Input DC Levels of ±10V
■
Short-Circuit Protected
■
Single 5V Supply
■
LVDS Compatible
■
Will Not Oscillate with Slow Input Signals
FEATURES
–
+
–
+
–
+
–
+
LTC1520
1520 TA01
3.3k
5V
3.3k
0.01µF
LTC1520 TA02
V
IN
=
1V/DIV
V
OUT
=
5V/DIV
–5 5 15
TIME (ns)
25 350 1020304045
RECEIVER
INPUT
V
ID
= 500mV
RECEIVER
OUTPUT
V
DD
= 5V
High Speed Backplane Receiver
Propagation Delay Guaranteed to Fall
Within Shaded Area (±3ns)
TYPICAL APPLICATION
U
APPLICATIONS
U
■
High Speed Backplane Interface
■
Line Collision Detector
■
PECL and LVDS Line Receivers
■
Level Translator
■
Ring Oscillator
■
Tapped Delay Line
, LTC and LT are registered trademarks of Linear Technology Corporation.
The LTC
®
1520 is a high speed, precision differential line
receiver that can operate at data rates as high as 50Mbps.
A unique architecture provides very stable propagation
delays and low skew over a wide input common mode,
input overdrive and ambient temperature range. Propaga-
tion delay is 18ns ±3ns, while typically t
PLH
/t
PHL
skew is
500ps and channel-to-channel skew is 400ps.
Each receiver translates differential input levels (V
ID
≥
100mV) into valid CMOS and TTL output levels. Its high
input resistance (≥18k) allows many receivers to be con-
nected to the same driver. The receiver outputs go into a
high impedance state when disabled.
Protection features include thermal shutdown and a con-
trolled maximum short-circuit current (50mA max) that
does not oscillate in and out of short-circuit mode. Input
resistance remains ≥18k when the device is unpowered or
disabled, thus allowing the LTC1520 to be hot swapped into
a backplane without loading the data lines.
The LTC1520 operates from a single 5V supply and draws
12mA of supply current. The part is available in a 16-lead
narrow SO package.
2
LTC1520
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
WU
U
PACKAGE
/
O
RDER I FOR ATIO
ORDER PART
NUMBER
(Note 1)
Supply Voltage ....................................................... 10V
Digital Input Currents ..................... –100mA to 100mA
Digital Input Voltages ............................... –0.5V to 10V
Receiver Input Voltages ........................................ ±10V
Receiver Output Voltages ............. –0.5V to V
DD
+ 0.5V
Short-Circuit Duration .................................... Indefinite
Operating Temperature Range .................... 0°C to 70°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
LTC1520CS
T
JMAX
= 150°C, θ
JA
= 90°C/W
Consult factory for Industrial and Military grade parts.
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
B1
A1
OUT 1
ENABLE
OUT 2
A2
B2
GND
V
DD
B4
A4
OUT 4
NC
OUT 3
A3
B3
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
CM
Input Common Mode Voltage A, B Inputs ● – 0.2 V
DD
+ 0.2 V
V
IH
Input High Voltage Enable Input ● 2V
V
IL
Input Low Voltage Enable Input ● 0.8 V
I
IN1
Input Current Enable Input ● –1 1 µA
I
IN2
Input Current (A, B) V
A
, V
B
= 5V ● 250 µA
V
A
, V
B
= 0 ● –250 µA
R
IN
Input Resistance (Figure 5) –0.2V ≤ V
CM
≤ V
DD
+ 0.2V ● 18 kΩ
C
IN
A, B Input Capacitance (Note 4) 3 pF
V
OC
Open-Circuit Input Voltage (Figure 5) V
DD
= 5V (Note 4) ● 3.2 3.3 3.4 V
V
ID(MIN)
Differential Input Threshold Voltage –0.2V < V
CM
< V
DD
+ 0.2V ● –0.1 0.1 V
dV
ID
Input Hysteresis V
CM
= 2.5V ● 20 mV
V
OH
Output High Voltage I
OUT
= –4mA, V
ID
= 0.1V, V
DD
= 5V ● 4.6 V
V
OL
Output Low Voltage I
OUT
= 4mA, V
ID
= 0.1V, V
DD
= 5V ● 0.4 V
I
OZR
Three-State Output Current 0V ≤ V
OUT
≤ V
DD
● –10 10 µA
I
DD
Total Supply Current All 4 Receivers V
ID
≥ 0.1V, No Load, Enable = 5V ● 12 20 mA
I
OSR
Short-Circuit Current V
OUT
= 0V, V
OUT
= V
DD
● –50 50 mA
CMRR Common Mode Rejection Ratio V
CM
= 2.5V, f = 25MHz 45 dB
V
DD
= 5V ±5% (Notes 2, 3) per receiver, unless otherwise noted.
DC ELECTRICAL CHARACTERISTICS
3
LTC1520
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
PLH
, t
PHL
Input-to-Output Propagation Delay C
L
= 15pF (Figure 1) ● 15 18 21 ns
t
r
, t
f
Rise/Fall Times C
L
= 15pF 2.5 ns
t
SKD
t
PLH
– t
PHL
Skew C
L
= 15pF, Same Receiver (Note 5) ● 500 ps
t
ZL
Enable to Output Low C
L
= 15pF (Figure 2) ● 10 35 ns
t
ZH
Enable to Output High C
L
= 15pF (Figure 2) ● 10 35 ns
t
LZ
Disable from Output Low C
L
= 15pF (Figure 2) ● 20 35 ns
t
HZ
Disable from Output High C
L
= 15pF (Figure 2) ● 20 35 ns
t
CH-CH
Channel-to-Channel Skew C
L
= 15pF (Figure 3) (Note 6) ● 400 ps
t
PKG-PKG
Package-to-Package Skew C
L
= 15pF, Same Temperature 1.5 ns
(Figure 4, Note 4)
Minimum Input Pulse Width (Note 4) 12 ns
f
IN
Maximum Input Frequency (Note 4) 40 MHz
V
DD
= 5V ±5% (Notes 2, 3) V
ID
= 500mV, V
CM
= 2.5V, unless otherwise noted.
SWITCHI G TI E CHARACTERISTICS
UW
The ● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute Maximum Ratings are those values beyond which the
safety of the device cannot be guaranteed. Recommended: V
DD
= 5V ±5%.
Note 2: All currents into the device pins are positive; all currents out of the
device pins are negative.
Note 3: All typicals are given for V
DD
= 5V, T
A
= 25°C.
Note 4: Guaranteed by design, but not tested.
Note 5: Worst-case
t
PLH
– t
PHL
skew for a single receiver in a package
over the full operating temperature range.
Note 6: Maximum difference between any two t
PLH
or t
PHL
transitions in a
single package over the full operating temperature range.
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
Propagation Delay (t
PLH
/t
PHL
)
vs Temperature
TEMPERATURE (°C)
–50 –25
0
PROPAGATION DELAY (ns)
10
25
0
50
75
LTC1520 G01
5
20
15
25
100
125
V
CM
= 2.5V
V
ID
= 500mV
Propagation Delay (t
PLH
/t
PHL
)
vs Input Overdrive
INPUT OVERDRIVE (V)
0.05
0
PROPAGATION DELAY (ns)
15
20
25
0.1 1 5 10
1520 G02
10
5
T
A
= 25°C
V
CM
= 2.5V
Propagation Delay (t
PLH
/t
PHL
)
vs Input Common Mode
INPUT COMMON MODE (V)
0
0
PROPAGATION DELAY (ns)
15
2
4
5
LTC1520 G03
10
5
13
20
25
T
A
= 25°C
V
ID
= 500mV
P1-P3P4-P6P7-P8

LTC1520CS#PBF

Mfr. #:
Buy LTC1520CS#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC 50Mbps Prec 4x Line Rcv
Lifecycle:
New from this manufacturer.
Delivery:
DHL FedEx Ups TNT EMS
Payment:
T/T Paypal Visa MoneyGram Western Union

Products related to this Datasheet