DATASHEET
ISL3332, ISL3333
FN6362
Rev 0.00
3.3V, 15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485)
May 27, 2008
Transceivers
The ISL3332, ISL3333 are two port interface ICs where each
Features
port can be independently configured as a single
15kV (HBM) ESD Protected Bus Pins (RS-232 or
RS-485/422 transceiver, or as a dual (2 Tx, 2 Rx) RS-232
RS-485)
transceiver. With both ports set to the same mode, two
Operates From a Single 3.3V Supply
RS-485/RS-422 transceivers, or four RS-232 transceivers
are available.
Two Independent Ports, Each User Selectable for RS-232
(2 Transceivers) or RS-485/RS-422 (1 Transceiver)
If either port is in RS-232 mode, the onboard charge pump
generates RS-232 compliant 5V Tx output levels from a
True Flow-Through Pinouts Simplify Board Layouts
single V supply as low as 3.15V. The transceivers are
CC
Pb-free (RoHS compliant)
RS-232 compliant, with the Rx inputs handling up to 25V.
Full Failsafe (Open/Short) Rx in RS-485/422 Mode
In RS-485 mode, the transceivers support both the RS-485
Loopback Mode Facilitates Board Self Test Functions
and RS-422 differential communication standards. The
receivers featurefull failsaf operation, so the Rx outputs
User Selectable RS-485 Data Rates (ISL3333 Only)
remain in a high state if the inputs are open or shorted
- Fast Speed . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20Mbps
together. The transmitters support up to three data rates, two
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 460kbps
of which are slew rate limited for problem free
- Slew Rate Limited. . . . . . . . . . . . . . . . . . . . . . . 115kbps
communications. The charge pump disables when both
Fast RS-232 Data Rate . . . . . . . . . . . . . . . Up to 400kbps
ports are in RS-485 mode, thereby saving power, minimizing
noise, and eliminating the charge pump capacitors.
RS-232 Tx and Rx Enable Pins (ISL3333 Only)
Both RS-232 and RS-485 modes feature loopback and
Small Charge Pump Caps . . . . . . . . . . . . . . . . . 4 x 0.1F
shutdown functions. Loopback internally connects the Tx
Low Current Shutdown Mode. . . . . . . . . . . . . . . . . . .35A
outputs to the corresponding Rx input, to facilitate board
QFN Package Saves Board Space (ISL3333 Only)
level self test implementation. The outputs remain connected
to the loads during loopback, so connection problems (e.g.,
Logic Supply Pin (V ) Eases Operation in Mixed Supply
L
shorted connectors or cables) can be detected. Shutdown
Systems (ISL3333 Only)
mode disables the Tx and Rx outputs, disables the charge
pumps, and places the IC in a low current (35A) mode. Applications
The ISL3333 is a QFN packaged device that includes two Gaming Applications (e.g., Slot Machines)
additional user selectable, lower speed and edge rate
Single Board Computers
options for EMI sensitive designs, or to allow longer bus
Factory Automation
lengths. It also features a logic supply pin (V ) that sets the
L
V level of logic outputs, and the switching points of logic
OH
Security Networks
inputs, to be compatible with another supply voltage in mixed
Industrial/Process Control Networks
voltage systems. The QFN also adds RS-232 mode Tx EN
pins (DEN), and active low Rx enable pins (RXEN) to
Level Translators (e.g., RS-232 to RS-422)
increase design flexibility. In RS-485 applications, active low
Point of Sale Equipment
Rx enable pins allow Tx/Rx direction control, via a single
Dual Channel RS-485 Interfaces
signal per port, by connecting the corresponding DE and
RXEN pins together.
For a single port version of these devices, please see the
ISL3330, ISL3331 data sheet.
TABLE 1. SUMMARY OF FEATURES
NO. OF RS-485 DATA RS-232 DATA RS-232 Tx ACTIVE H or L LOW POWER
PART NUMBER PACKAGE OPTIONS V PIN?
PORTS RATE (bps) RATE (kbps) ENABLE? Rx ENABLE? SHUTDOWN?
L
ISL3332 2 28 Ld SSOP 20M 400 NO NO NONE YES
ISL3333 2 40 Ld QFN (6 x 6mm) 20M, 460k, 115k 400 YES YES L YES
FN6362 Rev 0.00 Page 1 of 26
May 27, 2008ISL3332, ISL3333
Ordering Information
PART NUMBER TEMP. RANGE PACKAGE
(NOTE) PART MARKING (C) (Pb-Free) PKG. DWG. #
ISL3332IAZ* 3332 IAZ -40 to +85 28 Ld SSOP M28.209
ISL3333IRZ* 3333 IRZ -40 to +85 40 Ld QFN L40.6x6
*Add -T suffix for tape and reel. Please refer to TB347 for details on reel specifications.
NOTE: These Intersil Pb-free plastic packaged products employ special Pb-free material sets, molding compounds/die attach materials, and 100%
matte tin plate plus anneal (e3 termination finish, which is RoHS compliant and compatible with both SnPb and Pb-free soldering operations).
Intersil Pb-free products are MSL classified at Pb-free peak reflow temperatures that meet or exceed the Pb-free requirements of IPC/JEDEC J
STD-020.
Pinouts
ISL3332 (28 LD SSOP) ISL3333 (40 LD QFN)
TOP VIEW TOP VIEW
C1+ 1 28 C2+
C1- 2 27 C2-
40 39 38 37 36 35 34 33 32 31
V+ 3 26 V
CC
A1 4 25 R
B1
V+ 1 30 R
B1
B1 5 24 R
A1
A1 2 29 R
A1
Y1 6 23 D /DE1
Z1
B1 3 28 D /DE
Z1 7 22 D Z1 1
Y1
SEL1 8 21 LB
D
Y1 4 27
Y1
20
SEL2 9 ON/OFF
LB
Z1 5 26
Z2 10 19 D
Y2
SEL1 ON/OFF
6 25
Y2 11 18 D /DE2
Z2
B2 12 17 R
D
A2 SEL2
7 24 Y2
A2 13 16 R
B2
Z2 D /DE
8 23
Z2 2
GND 14 15 V-
Y2 9 22 R
A2
R
B2 10 21
B2
11 12 13 14 15 16 17 18 19 20
FN6362 Rev 0.00 Page 2 of 26
May 27, 2008
A2 NC
DEN1 NC
SPA C1-
SPB C1+
GND C2+
C2-
GND
RXEN1 V
CC
NC
RXEN2
V- NC
DEN2 V
L