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ISL83384ECAZA View Datasheet(PDF) - Intersil

Part NameDescriptionManufacturer
ISL83384ECAZA ±15kV ESD Protected/ +3V to +5.5V/ +/-1 Microamp/ 250kbps/ RS-232 Transmitters/Receivers Intersil
Intersil Intersil
ISL83384ECAZA Datasheet PDF : 9 Pages
1 2 3 4 5 6 7 8 9
ISL83384E
All the receivers convert RS-232 signals to CMOS output
levels and accept inputs up to ±30V while presenting the
required 3kto 7kinput impedance (see Figure 1) even if
the power is off (VCC = 0V). The receivers’ Schmitt trigger
input stage uses hysteresis to increase noise immunity and
decrease errors due to slow input signal transitions.
VCC
RXIN
-25V VRIN +25V
5k
RXOUT
GND VROUT VCC
GND
FIGURE 1. INVERTING RECEIVER CONNECTIONS
Low Power Operation
This 3V device requires a nominal supply current of 0.3mA,
even at VCC = 5.5V, during normal operation (not in
powerdown mode). This is considerably less than the 11mA
current required by comparable 5V RS-232 devices, allowing
users to reduce system power simply by replacing the old
style device with the ISL83384E.
Low Power, Pin Compatible Replacement
Pin compatibility with existing 5V products (e.g., MAX222),
coupled with the wide operating supply range, make the
ISL83384E a potential lower power, higher performance
drop-in replacement for existing 5V applications. As long as
the ±5V RS-232 output swings are acceptable, and
transmitter pull-up resistors aren’t required, the ISL83384E
should work in most 5V applications.
When replacing a device in an existing 5V application, it is
acceptable to terminate C3 to VCC as shown on the “Typical
Operating Circuit”. Nevertheless, terminate C3 to GND if
possible, as slightly better performance results from this
configuration.
Powerdown Functionality
The already low current requirement drops significantly
when the device enters powerdown mode. In powerdown,
supply current drops to 1µA, because the on-chip charge
pump turns off (V+ collapses to VCC, V- collapses to GND),
and the transmitter and receiver outputs three-state. This
micro-power mode makes these devices ideal for battery
powered and portable applications.
Software Controlled (Manual) Powerdown
The ISL83384E may be forced into its low power, standby
state via a simple shutdown (SHDN) pin (see Figure 4).
Driving this pin high enables normal operation, while driving
it low forces the IC into its powerdown state. The time
required to exit powerdown, and resume transmission is less
than 50µs. Connect SHDN to VCC if the powerdown function
isn’t needed.
VCC
VCC
VCC
CURRENT
FLOW
POWERED
DOWN
UART
GND
VOUT = VCC
Rx
Tx
SHDN = GND
OLD
RS-232 CHIP
FIGURE 2. POWER DRAIN THROUGH POWERED DOWN
PERIPHERAL
VCC
TRANSITION
DETECTOR
TO
WAKE-UP
LOGIC
VCC
ISL83384E
V-
RX
POWERED
DOWN
UART
TX
VOUT = HI-Z
FIGURE 3. DISABLED RECEIVERS PREVENT POWER DRAIN
PWR
MGT
LOGIC
SHDN
ISL83384E
CPU
I/O
UART
FIGURE 4. CONNECTIONS FOR MANUAL POWERDOWN
5
FN6017.3
March 15, 2005
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