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ADM1487JN Scheda tecnica(PDF) 8 Page - Analog Devices

Il numero della parte ADM1487JN
Spiegazioni elettronici  Ultra-Low Power RS-485/RS-422 Transceiver with Low EMI and /-10kV ESD Protection
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Produttore elettronici  AD [Analog Devices]
Homepage  http://www.analog.com
Logo AD - Analog Devices

ADM1487JN Scheda tecnica(HTML) 8 Page - Analog Devices

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ADM1487
–8–
Rev. PrC
PRELIMINARY TECHNICAL DATA
CMOS outout stages, which include parasitic diodes from
their driver outputs to each supply rail and can latch up
when these diodes conduct.
V CC
PA RA SITIC
DIO DE D P
PA RA SIT IC
DIO DE DP
S CH OTTKY
REVERSE-BIA SED
WH E N OUT P UT
> V CC +V D
SC HO TT K Y
R EVE R SE-B IASED
WHE N O U TP U T
< G N D - V D
Figure 9. ADM1487 Driver Output Stage
The ADM1487 output includes Schottky diodes in series
with the positive supply to the drain of the P-channel output
device and in series with the drain of the N-channel output
device. These diodes prevent the P-channel's parasitic diode
from conducting when the output voltage exceeds VCC and
prevent the N-channel's parasitic diode from conducting
when the output voltage falls below ground.
SLEW RATE CONTROL
The driver output stage of the ADM1487 has a controlled
slew rate to minmize signal reflections on incorrectly termi-
nated lines and to reduce electromagnetic interference (EMI).
CURRENT LIMIT AND THERMAL SHUTDOWN
The ADM1487 incorporates two protection mechanisms to
guard the drivers against short-circuits, bus contention or
other fault conditions. The first is a current-limited output
stage that protects the driver against short-circuits over the
entire common-mode voltage range by limiting the output
current to about 70mA. Under extreme fault condtions
where the current limit is not effective, a thermal shutdown
circuit puts the driver outputs into a high-impedance state if
the die temperature exceeds 150°C, and does not turn them
back on until the temperature has fallen to 130°C.
ENHANCED ESD PROTECTION
All Analog Devices parts incorporate protection against
electrostatic discharge (ESD) to protect the devices dur-
ing handling, assembly and normal operation. In addition,
the ADM1487 has enhanced ESD protection up to ±10kV
on the A and B I/O pins to protect against severe opera-
tional conditions such as line transients, connection and
disconnection.
APPLICATION INFORMATION
Figure 10 shows a typical application of the ADM1487.
This is a half-duplex RS-485/RS-422 network. Up to 254
additional ADM1487s can be connected along the cable
(termination resistors are only required at each end).
Figure 10. Typical Half-Duplex RS-485/RS-422 Network
OUTLINE DIMENSIONS
Dimensions shown in inches and (mm).
8-Pin Plastic Dual-In-Line Package (N-8)
8
14
5
0. 43 0 (10 . 92 )
0. 34 8 (8.84 )
0. 28 0 (7.11 )
0. 24 0 (6.10 )
PIN 1
SE A TI N G
P L ANE
0. 02 2 (0.5 58 )
0. 01 4 (0.3 56 )
0. 06 0 (1. 52 )
0. 01 5 (0. 38 )
0.21 0 ( 5. 33 )
MA X
0.130
(3 .30 )
MIN
0.07 0 ( 1. 77 )
0.04 5 ( 1. 15 )
0.1 0 0
(2 .54 )
BS C
0. 16 0 (4.06 )
0. 11 5 (2.93 )
0. 32 5 (8. 25 )
0. 30 0 (7. 62 )
0. 01 5 (0. 3 81 )
0. 00 8 (0. 2 04 )
0. 19 5 (4. 95 )
0. 11 5 (2. 93 )
8-Pin SO Package (R-8)
85
4
1
0. 1968 (5. 00)
0. 1890 (4. 80)
0. 1574 (4. 00)
0. 1497 (3. 80)
0.24 4 0 (6 .20 )
0.22 8 4 (5 .80 )
PI N 1
SE A TI N G
P L ANE
0. 00 9 8 (0 .25 )
0. 00 4 0 (0 .10 )
0. 0192 (0. 49)
0. 0138 (0. 35)
0. 10 2 (2.59 )
0. 09 4 (2.39 )
0. 0500
(1 . 27 )
BS C
0. 0098 (0.25)
0. 0075 (0.19)
0. 05 0 0 (1 .27 )
0. 01 6 0 (0 .41 )
8
0
0. 0196 (0.50)
0. 0099 (0.25)
x 4 5
100n
DI
D
R
5
6
7
8
4
3
2
1
ADM1487
DE
RO
100n
+5V
(VCC
)
+5V (VCC)
RT
RT
DATA
IN (DI)
RECEIVER
OUTPUT
(RO)
1
2
3
4
8
7
6
5
D
R
RECEIVER
ENABLE
(
RE)
DRIVER
ENABLE
(DE)
ADM1487
CABLE TERMINATED
AT ENDS
ADDITIONAL
ADM1487s
A
B
A
B
A
B
RE


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