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LTC1689IS#PBF

P1-P3P4-P6P7-P9P10-P12
1
LTC1688/LTC1689
16889fa
100Mbps RS485
Hot Swapable Quad Drivers
■
Ultrahigh Speed:
100Mbps
■
Guaranteed Propagation Delay: 8ns
±
4ns
Over Temperature
■
Low Channel-to-Channel Skew: 500ps Typ
■
Hot Swap
TM
Capable
■
50Mbps Operation with V
DD
= 3V
■
Low t
PLH
/t
PHL
Skew: 500ps Typ
■
Driver Outputs Maintain High Impedance in
Three-State or with Power Off
■
Short-Circuit Protected: 3mA Typ Output Current
for an Indefinite Short
■
Thermal Shutdown Protected
■
Single 5V or 3V Supply
■
Pin Compatible with LTC486/LTC487
The LTC
®
1688/LTC1689 are ultrahigh speed, differential
bus/line drivers that can operate at data rates up to
100Mbps. Propagation delay is guaranteed at 8ns ±4ns
over the full operating temperature range. These devices
operate over the full RS485 common mode range (–7V
to 12V), and also meet RS422 requirements.
The driver outputs are Hot Swap capable, maintaining
backplane data integrity during board insertion and
removal. The drivers feature three-state outputs, maintain-
ing high impedance over the entire common mode range
(–7V to 12V). Outputs also remain high impedance during
power-up and with the power off. A short-circuit feature
detects bus contention and substantially reduces driver
output current. Thermal shutdown circuitry protects the
parts from excessive power dissipation.
The LTC1688 allows all four drivers to be enabled together,
while the LTC1689 allows two drivers at a time to be
enabled.
The LTC1688/LTC1689 operate from a single 5V or 3V
supply and draw only 9mA of supply current.
■
High Speed RS485 Twisted-Pair Drivers
■
High Speed Backplane Drivers
■
Complementary Clock Drivers
■
STS-1/OC-1 Data Drivers
■
SCSI Drivers
Hot Swap is a trademark of Linear Technology Corporation.
, LTC and LT are registered trademarks of Linear Technology Corporation.
20ns Pulse Across 100 Feet
of Category 5 UTP
20ns/DIV
2V/DIV
2V/DIV
2V/DIV
5V/DIV
1688/89 TA02
DRIVER INPUT
DRIVER OUTPUTS
RECEIVER INPUT
RECEIVER OUTPUT
CABLE DELAY
1688/89 TA01
RECEIVER
1/4 LTC1688
100Ω100Ω
1/4 LTC1518
100 FT CATEGORY 5 UTP
DRIVER
50Mbps RS485 Data Connection
DESCRIPTIO
U
FEATURES
APPLICATIO S
U
TYPICAL APPLICATIO
U
2
LTC1688/LTC1689
16889fa
WU
U
PACKAGE
/
O
RDER I FOR ATIO
A
U
G
W
A
W
U
W
ARB
S
O
LU
T
EXI T
I
S
(Note 1)
Supply Voltage (V
DD
)................................................ 7V
Enable Input Voltages ................. –0.5V to (V
DD
+ 0.5V)
Enable Input Currents ..................... –100mA to 100mA
Driver Input Voltages .................. –0.5V to (V
DD
+ 0.5V)
Driver Output Voltages ................. (–12V + V
DD
) to 12V
Driver Input Currents ...................... –100mA to 100mA
Short-Circuit Duration (V
OUT
: –7V to 10V) ...... Indefinite
Operating Temperature Range
LTC1688C/LTC1689C ............................. 0°C to 70°C
LTC1688I/LTC1689I .......................... –40°C to 85°C
Storage Temperature Range ................ –65°C to 150°C
Lead Temperature (Soldering, 10 sec)................. 300°C
DC ELECTRICAL CHARACTERISTICS
ORDER PART
NUMBER
LTC1688CS
LTC1689CS
LTC1688IS
LTC1689IS
TOP VIEW
S PACKAGE
16-LEAD PLASTIC SO
*LTC1689 ONLY
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
DI1
DO1A
DO1B
EN (EN12*)
DO2B
DO2A
DI2
GND
V
DD
DI4
DO4A
DO4B
ENB (EN34*)
DO3B
DO3A
DI3
T
JMAX
= 150°C, θ
JA
= 90°C/W
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
Consult factory for parts specified with wider operating temperature ranges.
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
= 5V, Per Driver, T
A
= 25
°
C, Unless Otherwise Noted (Note 2)
V
OD1
Differential Driver Output (Unloaded) I
OUT
= 0 ● V
DD
V
V
OD2
Differential Driver Output (With Load) R = 50Ω (RS422) ● 2V
R = 25Ω (RS485), Figure 1 ● 1.5 3.0 V
∆V
OD
Change in Magnitude of Driver Differential R = 25Ω or 50Ω, Figure 1 ● 0.2 V
Output Voltage for Complementary
Output States
V
OC
Driver Common Mode Output Voltage R = 25Ω or 50Ω, Figure 1 ● 23V
∆V
OC
Change in Magnitude of Driver Common R = 25Ω or 50Ω, Figure 1 ● 0.2 V
Mode Output Voltage for Complementary
Output States
V
IH
Input High Voltage EN, ENB, EN12, EN34, DI ● 2V
V
IL
Input Low Voltage EN, ENB, EN12, EN34, DI ● 0.8 V
I
IN1
Input Current EN, ENB, EN12, EN34, DI ● ±1 µA
I
OZ
Three-State (High Impedance) V
OUT
= –7V to 12V ● ±2 ±200 µA
Output Current
I
DD
Supply Current of Entire Device No Load, Digital Input Pins = 0V or V
DD
● 918 mA
I
OSD1
Driver Short-Circuit Current, V
OUT
= HIGH V
OUT
= –7V to 10V ● ±20 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= LOW V
OUT
= –7V to 10V ● ±20 mA
V
DD
= 3V, Per Driver, T
A
= 25
°
C, Unless Otherwise Noted (Note 2)
V
OD1
Differential Driver Output (Unloaded) I
OUT
= 0 ● V
DD
V
V
OD2
Differential Driver Output (With Load) R = 50Ω (RS422) 1.5 V
R = 25Ω (RS485), Figure 1
● 0.65 2.0 V
∆V
OD
Change in Magnitude of Driver Differential R = 25Ω or 50Ω, Figure 1 0.1 V
Output Voltage for Complementary
Output States
V
OC
Driver Common Mode Output Voltage R = 25Ω or 50Ω, Figure 1 1.3 V
3
LTC1688/LTC1689
16889fa
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
∆V
OC
Change in Magnitude of Driver Common R = 25Ω or 50Ω, Figure 1 0.1 V
Mode Output Voltage for Complementary
Output States
V
IH
Input High Voltage EN, ENB, EN12, EN34, DI ● 1.4 V
V
IL
Input Low Voltage EN, ENB, EN12, EN34, DI ● 0.5 V
I
IN1
Input Current EN, ENB, EN12, EN34, DI (Note 3) ● ±1 µA
I
OZ
Three-State (High Impedance) V
OUT
= –7V to 10V (Note 3) ● ±1 ±200 µA
Output Current
I
DD
Supply Current of Entire Device No Load, Digital Input Pins = 0V or V
DD
5mA
I
OSD1
Driver Short-Circuit Current, V
OUT
= HIGH V
OUT
= –7V to 8V (Note 3) ● ±20 mA
I
OSD2
Driver Short-Circuit Current, V
OUT
= LOW V
OUT
= –7V to 8V (Note 3) ● ±20 mA
Note 1: Absolute Maximum Ratings are those values beyond which the life
of a device may be impaired.
Note 2: All currents into the device pins are positive; all currents out of the
device pins are negative.
Note 3: Guaranteed by design or correlation, but not tested.
SWITCHING CHARACTERISTICS
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
V
DD
= 5V, T
A
= 25
°
C, Unless Otherwise Noted (Note 2)
t
PLH
, t
PHL
Driver Input-to-Output Propagation Delay R
DIFF
= 50Ω, C
L1
= C
L2
= 25pF, ● 4812 ns
Figures 2, 4
t
SKEW
Driver Output-to-Output Skew R
DIFF
= 50Ω, C
L1
= C
L2
= 25pF, 500 ps
Figures 2, 4
t
r
, t
f
Driver Rise/Fall Time R
DIFF
= 50Ω, C
L1
= C
L2
= 25pF, 2 ns
Figures 2, 4
t
ZH
Driver Enable to Output High C
L
= 25pF, S2 Closed, Figures 3, 5 ● 10 35 ns
t
ZL
Driver Enable to Output Low C
L
= 25pF, S1 Closed, Figures 3, 5 ● 10 35 ns
t
LZ
Driver Disable from Low C
L
= 15pF, S1 Closed, Figures 3, 5 ● 25 65 ns
t
HZ
Driver Disable from High C
L
= 15pF, S2 Closed, Figures 3, 5 ● 25 65 ns
C
L(MAX)
Maximum Output Capacitive Load (Note 3) ● 200 pF
Maximum Data Rate (Note 3) ● 100 Mbps
Maximum Driver Input Rise/Fall Time (Note 3) ● 500 ns
V
DD
= 3V, T
A
= 25
°
C, Unless Otherwise Noted (Note 2)
t
PLH
, t
PHL
Driver Input-to-Output Propagation Delay R
DIFF
= 50Ω, C
L1
= C
L2
= 25pF, 11 ns
Figures 2, 4
t
SKEW
Driver Output-to-Output Skew R
DIFF
= 50Ω, C
L1
= C
L2
= 25pF, 1 ns
Figures 2, 4
t
r
, t
f
Driver Rise/Fall Time R
DIFF
= 50Ω, C
L1
= C
L2
= 25pF, 4 ns
Figures 2, 4
t
ZH
Driver Enable to Output High C
L
= 25pF, S2 Closed, Figures 3, 5 25 ns
t
ZL
Driver Enable to Output Low C
L
= 25pF, S1 Closed, Figures 3, 5 25 ns
t
LZ
Driver Disable from Low C
L
= 15pF, S1 Closed, Figures 3, 5 50 ns
t
HZ
Driver Disable from High C
L
= 15pF, S2 Closed, Figures 3, 5 50 ns
C
L(MAX)
Maximum Output Capacitive Load (Note 3) ● 200 pF
Maximum Data Rate 50 Mbps
Maximum Driver Input Rise/Fall Time (Note 3) ● 500 ns
DC ELECTRICAL CHARACTERISTICS
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
The ● denotes the specifications which apply over the full operating
temperature range, otherwise specifications are at T
A
= 25°C.
P1-P3P4-P6P7-P9P10-P12

LTC1689IS#PBF

Mfr. #:
Buy LTC1689IS#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC 100Mbps RS485 Hot Swapable 4x Drvrs
Lifecycle:
New from this manufacturer.
Delivery:
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