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ISL33357E Datasheet(PDF) 3 Page - Intersil Corporation

No. de pieza ISL33357E
Descripción Electrónicos  Full fail-safe (open/short) RS-485/422 port 2 Rx
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Fabricante Electrónico  INTERSIL [Intersil Corporation]
Página de inicio  http://www.intersil.com/cda/home
Logo INTERSIL - Intersil Corporation

ISL33357E Datasheet(HTML) 3 Page - Intersil Corporation

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ISL33354E, ISL33357E
3
FN8775.1
October 21, 2016
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Pin Descriptions
PIN NAME
PIN #
for
SSOP
PIN # for
QFN
PORT/MODE
FUNCTION
NC
-
12, 20, 32,
33, 39, 40
BOTH
No Internal Connection.
DNC
-
21
BOTH
Do not make any external connections to this pin.
SHDN
21
25
BOTH
A low on SHDN disables the charge pumps, disables all the outputs and places the device in low power
shutdown. Internally pulled-high. SHDN = 1 for normal operation.
VCC
26
31, 34
BOTH
System power supply input (4.5V to 5.5V). Both pins 31 and 34 must connect to the VCC supply.
GND
15
15, 16
BOTH
Ground connection. QFN pins 15 and 16 must both connect to GND. This is also the potential of the
QFN’s exposed metal pad (EP).
*VCC
9
7, 14, 26
BOTH
For proper operation, connect this lead to the VCC supply. This is not a power supply lead, so no decoupling
is required.
*GND
8
6, 17
BOTH
For proper operation, connect this lead to GND. This is not a power supply lead.
RxIN
4, 5
2, 3
1 / RS-232 RS-232 receiver input with ±15kV ESD protection. A low on RxIN forces RxOUT high; a high on RxIN
forces RxOUT low.
RxOUT
24, 25
29, 30
1 / RS-232 RS-232 receiver output.
TxIN
22, 23
27, 28
1 / RS-232 RS-232 transmitter input. A low on TxIN drives the corresponding TxOUT high, while a high on TxIN drives
the corresponding TxOUT low.
TxOUT
6, 7
4, 5
1 / RS-232 RS-232 transmitter output with ±15kV ESD protection.
C1+
1
37
1 / RS-232 External charge pump capacitor is connected to this lead.
C1-
2
38
1 / RS-232 External charge pump capacitor is connected to this lead.
C2+
28
36
1 / RS-232 External charge pump capacitor is connected to this lead.
C2-
27
35
1 / RS-232 External charge pump capacitor is connected to this lead.
V+
3
1
1 / RS-232 Internally generated positive RS-232 transmitter supply (+6V).
V-
17
19
1 / RS-232 Internally generated negative RS-232 transmitter supply (-7V).
A
12
10
2 / RS-485 RS-485 noninverting receiver input with ±15kV ESD protection.
B
13
11
2 / RS-485 RS-485 inverting receiver input with ±15kV ESD protection.
Y
10
8
2/ RS-485
RS-485 noninverting driver output with ±15kV ESD protection.
Z
11
9
2/ RS-485
RS-485 inverting driver output with ±15kV ESD protection.
DI
20
24
2 / RS-485 RS-485 driver input. A low on DI forces output Y low and output Z high.
RO
18
22
2 / RS-485 RS-485 receiver output: If A > B by at least -40mV, RO is high; If A < B by -200mV or more, RO is low;
RO = High if A and B are unconnected (floating) or shorted together (i.e., full fail-safe).
SLOW48
5
14
13
2 / RS-485 RS-485 data rate control. A low on SLOW485 selects the 115kbps RS-485 data rate (slew rate limited
output transitions); a high selects the 20Mbps data rate (full speed transitions). Internally pulled-high.
RE485
16
18
2/ RS-485
RS-485 active low receiver output enable. RO is enabled when RE485 is low; RO is high impedance
when RE485 is high. Internally pulled low.
DE485
19
23
2/ RS-485
RS-485 driver output enable (DE). The driver outputs, Y and Z, are enabled by driving DE485 high. They
are high impedance when DE485 is low. Internally pulled high.
EP
-
EP
BOTH
QFN exposed thermal pad (EPAD). Connect to GND.


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