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PDF ISL33337E Data sheet ( Hoja de datos )
| Número de pieza | ISL33337E | |
| Descripción | Dual Protocol (RS-232/RS-485) Transceivers | |
| Fabricantes | Intersil | |
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DATASHEET
3.3V, ±15kV ESD Protected, Two Port, Dual Protocol
(RS-232/RS-485) Transceivers
ISL33334E, ISL33337E
The ISL33334E, ISL33337E are two port interface ICs where
port 1 is configured as a dual (2 Tx, 2 Rx) RS-232 transceiver
and port 2 is a single RS-485/RS-422 transceiver.
The on-board charge pump generates RS-232 compliant ±5V
Tx output levels from a single VCC supply as low as 3.15V. The
transceivers are RS-232 compliant, with the Rx inputs
handling up to ±25V.
The port 2 transceiver supports both the RS-485 and RS-422
differential communication standards. The receiver features
"full fail-safe" operation, so the Rx output remains in a high
state if the inputs are open or shorted together. The
transmitter supports two data rates, one of which is slew rate
limited for problem free communication at low data rates. The
active low Rx enable pin (RE485) allows Tx/Rx direction
control, via a single signal, simply by connecting the
corresponding DE485 and RE485 pins together.
The ISL33334E and ISL33337E also include a shutdown
function, which disables the Tx and Rx outputs, disables the
charge pumps and places the IC in a low current (40µA) mode.
The ISL33337E is a QFN packaged device for space
constrained applications.
Related Literature
• For a full list of related documents, visit our website
- ISL33334E, ISL33337E product pages
Features
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• Operates from a single 3.3V supply
• Two independent ports, port 1 set for RS-232 (2 Transceivers)
and port 2 for RS-485/RS-422 (1 transceiver)
• True flow-through pinouts (Rx inputs and Tx outputs all on
the same side) simplify board layouts
• Pb-free (RoHS compliant)
• Full fail-safe (open/short) RS-485/422 Port 2 Rx
• User selectable RS-485 data rates
- Fast speed. . . . . . . . . . . . . . . . . . . . . . . . . . . . up to 20Mbps
- Slew rate limited . . . . . . . . . . . . . . . . . . . . . . up to 115kbps
• Fast RS-232 data rate . . . . . . . . . . . . . . . . . . . . up to 400kbps
• Small charge pump capacitors . . . . . . . . . . . . . . . . 4 x 0.1µF
• Low current shutdown mode . . . . . . . . . . . . . . . . . . . . . . 40µA
• QFN package saves board space (ISL33337E only)
Applications
• Gaming applications (e.g., slot machines)
• Single board computers
• Factory automation
• Security networks
• Industrial/process control networks
• Level translators (e.g., RS-232 to RS-422)
• Point-of-sale equipment
PART NUMBER
ISL33334E
ISL33337E
PACKAGE OPTION
28 Ld SSOP
40 Ld QFN (6x6mm)
TABLE 1. SUMMARY OF FEATURES
PORT 2
PORT 1
RS-485 DATA RATE (bps) RS-232 DATA RATE (bps)
20M, 115k
400k
20M, 115k
400k
LOW POWER
SHUTDOWN?
YES
YES
PORT 2
RS-485 Rx AND Tx ENABLE?
YES
YES
October 21, 2016
FN8776.1
1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 |Copyright Intersil Americas LLC 2015, 2016. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL33334E, ISL33337E
Typical Operating Circuits
+3.3V
C1
0.1µF
C2
0.1µF
+ 0.1µF
1
+
C1+
2 C1-
28
+
C2+
27
C2-
9, 26
VCC
R1IN
4
R2IN
5
5kΩ
5kΩ
R
R
3
V+
+ C3
0.1µF
V- 17
C4
+0.1µF
24 R1OUT
25
R2OUT
T2OUT
T1OUT
7
6
B 13
12
A
11
Z
10
Y
D
D
R
D
GND
8, 15
23
T2IN
22
T1IN
18 RO
16
RE485
20
DI
19
DE485 VCC
21 VCC
14 SHDN
SLOW485
NOTE: PINOUT FOR SSOP
FIGURE 1. PORT RS-232 MODE AND 1 PORT RS-485 MODE
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October 21, 2016
5 Page 
ISL33334E, ISL33337E
Test Circuits and Waveforms (Continued)
VCC
SHDN
TxIN
D
TxOUT
CL
SIGNAL
GENERATOR
RL
TxIN
1.5V
tDPHL
TxOUT
0V
SKEW = |tDPHL - tDPLH|
1.5V
3V
0V
tDPLH
VO+
0V
VO-
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES
VCC
SHDN
RxIN
R
RxOUT
SIGNAL
GENERATOR
CL = 15pF
RxIN
50%
tRPHL
RxOUT
SKEW = |tRPHL - tRPLH|
50%
50%
3V
0V
tRPLH
50%
VOH
VOL
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES
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October 21, 2016
11 Page | ||
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| PDF Descargar | [ Datasheet ISL33337E.PDF ] | |
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