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LTC1487CS8#PBF

P1-P3P4-P6P7-P8
4
LTC1487
sn1487 1487fs
0°C ≤ TA ≤ 70°C, V
CC
= 5V (Notes 2, 3) unless otherwise noted.
SWITCHI G CHARACTERISTICS
U
SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS
t
ZH(SHDN)
Driver Enable from Shutdown to Output High C
L
= 100pF (Figures 4, 6), S2 Closed ● 2000 ns
t
ZL(SHDN)
Driver Enable from Shutdown to Output Low C
L
= 100pF (Figures 4, 6), S1 Closed ● 2000 ns
t
ZH(SHDN)
Receiver Enable from Shutdown to Output High C
L
= 15pF (Figures 2, 8), S2 Closed ● 2000 ns
t
ZL(SHDN)
Receiver Enable from Shutdown to Output Low C
L
= 15pF (Figures 2, 8), S1 Closed ● 2000 ns
Note 3: All typicals are given for V
CC
= 5V and T
A
= 25°C.
Note 4: The LTC1487 is not tested and is not quality-assurance sampled at
–40°C and at 85°C. These specifications are guaranteed by design,
correlation, and/or inference from 0°C, 25°C and/or 70°C tests.
The
● denotes specifications which apply over the full operating
temperature range.
Note 1: Absolute maximum ratings are those beyond which the safety of
the device cannot be guaranteed.
Note 2: All currents into device pins are positive; all currents out ot device
pins are negative. All voltages are referenced to device ground unless
otherwise specified.
TYPICAL PERFORMANCE CHARACTERISTICS
U
W
TEMPERATURE (°C)
–50
0
SUPPLY CURRENT (µA)
50
150
200
250
100
450
LTC1487 • TPC01
100
25 175
50
–25 125
75
0 150
300
350
400
DRIVER ENABLED
WITH NO LOAD
THERMAL SHUTDOWN
WITH DRIVER ENABLED
AND NOMINAL LOAD
DRIVER DISABLED WITH NO LOAD
Supply Current vs Temperature
Driver Differential Output Voltage
vs Output Current
Driver Output Low Voltage
vs Output Current
OUTPUT VOLTAGE (V)
0
0
OUTPUT CURRENT (mA)
20
40
60
80
100
120
T
A
= 25°C
1234
LTC1487 • TPC04
TEMPERATURE (°C)
–50
350
400
500
25 75
LTC1487 • G06
300
250
–25 0
50 100 125
200
150
450
TIME (ns)
Driver Skew vs Temperature
OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (mA)
40
50
60
4.0
LTC1487 • TPC02
30
20
0
1.0
2.0
3.0
0.5 4.5
1.5
2.5
3.5
10
80
70
T
A
= 25°C
Driver Output High Voltage
vs Output Current
OUTPUT VOLTAGE (V)
0
OUTPUT CURRENT (mA)
–40
–20
0
4
LTC1487 • TPC05
–60
–80
–50
–30
–10
–70
–90
–100
1
2
3
5
T
A
= 25°C
Driver Differential Output Voltage
vs Temperature
TEMPERATURE (°C)
–50
DIFFERENTIAL VOLTAGE (V)
2.08
2.20
2.22
2.24
0
50
75
LTC1487 • TPC03
2.04
2.02
2.16
2.12
2.06
2.18
2.00
2.14
2.10
–25
25
100
125
R
L
= 54Ω
5
LTC1487
sn1487 1487fs
DI (Pin 4): Driver Input. If the driver outputs are enabled
(DE HIGH) then a LOW on DI forces the outputs A LOW and
B HIGH. A HIGH on DI with the driver outputs enabled will
force A HIGH and B LOW.
GND (Pin 5): Ground.
A (Pin 6): Driver Output/Receiver Input.
B (Pin 7): Driver Output/Receiver Input.
V
CC
(Pin 8): Positive Supply. 4.75V < V
CC
< 5.25V.
PIN FUNCTIONS
UUU
RO (Pin 1): Receiver Output. If the receiver output is
enabled (RE LOW), and A > B by 200mV, RO will be HIGH.
If A < B by 200mV, then RO will be LOW.
RE (Pin 2): Receiver Output Enable. A LOW enables the
receiver output, RO. A HIGH input forces the receiver
output into a high impedance state.
DE (Pin 3): Driver Outputs Enable. A HIGH on DE enables
the driver output. A and B and the chip will function as a line
driver. A LOW input will force the driver outputs into a high
impedance state and the chip will function as a line
receiver. If RE is HIGH and DE is LOW, the part will enter
a low power (1µA) shutdown state.
Figure 3. Driver/Receiver Timing Test Circuit Figure 4. Driver Timing Test Load
OUTPUT
UNDER TEST
C
L
S1
S2
V
CC
500Ω
LTC1487 • F04
3V
DE
A
B
DI
R
DIFF
C
L1
C
L2
RO
15pF
A
B
RE
LTC1487 • F03
Figure 1. Driver DC Test Load Figure 2. Receiver Timing Test Load
V
OD
A
B
R
R
V
OC
LTC1487 • F01
RECEIVER
OUTPUT
C
RL
1k
S1
S2
TEST POINT
V
CC
1k
LTC1487 • F02
TEST CIRCUITS
LTC1487 Transmitting
INPUTS OUTPUTS
RE DE DI B A
X1101
X1010
00XZZ
1 0 X Z* Z*
*Shutdown mode
LTC1487 Receiving
INPUTS OUTPUTS
RE DE A – B RO
00≥0.2V 1
00≤–0.2V 0
0 0 Inputs Open 1
10 X Z*
*Shutdown mode
FU CTIO TABLES
UU
6
LTC1487
sn1487 1487fs
Figure 5. Driver Propagation Delays
Figure 6. Driver Enable and Disable Times
DI
3V
1.5V
t
PLH
t
r
t
SKEW
1/2 V
O
V
O
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
90%
10%
0V
B
A
V
O
–V
O
0V
90%
1.5V
t
PHL
t
SKEW
1/2 V
O
10%
t
f
V
DIFF
= V(A) – V(B)
LTC1487 • F05
1.5V
2.3V
2.3V
t
ZH(SHDN)
,
t
ZH
t
ZL(SHDN)
,
t
ZL
1.5V
t
LZ
0.5V
0.5V
t
HZ
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
DE
5V
V
OL
V
OH
0V
A, B
A, B
LTC1487 • F06
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
SWITCHI G TI E WAVEFOR S
UW W
Figure 7. Receiver Propagation Delays
1.5V
t
PHL
RO
–V
OD2
A – B
0V 0V
1.5V
t
PLH
OUTPUT
INPUT
V
OD2
V
OL
V
OH
LTC1487 • F07
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
Figure 8. Receiver Enable and Disable Times
1.5V
t
ZL(SHDN)
, t
ZL
t
ZH(SHDN)
, t
ZH
1.5V
1.5V
1.5V
t
LZ
0.5V
0.5V
t
HZ
OUTPUT NORMALLY LOW
OUTPUT NORMALLY HIGH
3V
0V
RE
5V
0V
RO
RO
LTC1487 • F08
f = 1MHz, t
r
≤ 10ns, t
f
≤ 10ns
P1-P3P4-P6P7-P8

LTC1487CS8#PBF

Mfr. #:
Buy LTC1487CS8#PBF
Manufacturer:
Analog Devices Inc.
Description:
RS-485 Interface IC Ultra-L Pwr RS485 w/ L EMI, SD & Hi In I
Lifecycle:
New from this manufacturer.
Delivery:
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