isl81334 Intersil Corporation, isl81334 Datasheet - Page 5

• Manufacturer Part Number: isl81334
• Description: ?15kv Esd Protected, 5v, Two Port, Dual Protocol Rs-232/rs-485 Transceivers
• Manufacturer: Intersil Corporation

Pin Descriptions
ON/OFF
RXEN1
RXEN2
GND
V
SEL
C1+
C2+
PIN
C1-
C2-
NC
D
DE
R
R
SP
LB
V
D
V+
V-
CC
A
B
Y
Z
L
Y
Z
A
B
BOTH
BOTH
BOTH
BOTH
BOTH
BOTH
BOTH
BOTH
RS-232 Receiver input with ±15kV ESD protection. A low on A forces R
RS-485 Inverting receiver input with ±15kV ESD protection.
RS-232 Receiver input with ±15kV ESD protection. A low on B forces R
RS-485 Noninverting receiver input with ±15kV ESD protection.
RS-232 Driver input. A low on D
RS-485 Driver input. A low on D
RS-232 Driver input. A low on D
RS-485 Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is
RS-232 Receiver output.
RS-485 Receiver output: If B > A by at least -40mV, R
RS-232 Receiver output.
RS-485 Not used. Internally pulled-high, and unaffected by RXEN.
RS-232 Driver output with ±15kV ESD protection.
RS-485 Inverting driver output with ±15kV ESD protection.
RS-232 Driver output with ±15kV ESD protection.
RS-485 Noninverting driver output with ±15kV ESD protection.
RS-485 Speed control. Internally pulled-high. (QFN only)
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 External capacitor (voltage doubler) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 External capacitor (voltage inverter) is connected to this lead. Not needed if both ports in RS-485 Mode.
RS-232 Internally generated positive RS-232 transmitter supply (+5.5V). C3 not needed if both ports in RS-485 Mode.
RS-232 Internally generated negative RS-232 transmitter supply (-5.5V). C4 not needed if both ports in RS-485 Mode.
MODE
Ground connection.
Enables loopback mode when low. Internally pulled-high.
No Connection.
If either port is in RS-232 mode, a low on ON/OFF disables the charge pumps. In either mode, a low disables all the outputs,
and places the device in low power shutdown. Internally pulled-high. ON = 1 for normal operation.
Active low receiver output enable. Rx is enabled when RXEN is low; Rx is high impedance when RXEN is high. Internally
pulled low. (QFN only)
Interface Mode Select input. High puts corresponding port in RS-485 Mode, while a low puts it in RS-232 Mode.
System power supply input (5V).
Logic-Level Supply. All TTL/CMOS inputs and outputs are powered by this supply. QFN logic input pins that are externally
tied high in the application should use the V
low. Internally pulled high when port selected for RS-485 mode.
unconnected (floating) or shorted together (i.e., full fail-safe).
5
Y
Y
Z
forces output Y high and output Z low. Similarly, a high on D
forces output Z high. Similarly, a high on D
forces output Y high. Similarly, a high on D
ISL81334, ISL41334
L
A
supply for the high voltage level. (QFN only)
is high; If B < A by -200mV or more, R
FUNCTION
A
B
high; a high on A forces R
high; a high on B forces R
Z
Y
forces output Z low.
forces output Y low.
Y
A
forces output Y low and output Z high.
is low; R
A
B
low.
low.
A
= High if A and B are
November 21, 2007
FN6202.3