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PDF ISL33354E Data sheet ( Hoja de datos )
| Número de pieza | ISL33354E | |
| Descripción | Dual Protocol (RS-232/RS-485) Transceivers | |
| Fabricantes | Intersil | |
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DATASHEET
5V, ±15kV ESD Protected, Two Port, Dual Protocol
(RS-232/RS-485) Transceivers
ISL33354E, ISL33357E
The ISL33354E, ISL33357E 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-485/422 transceiver.
An on-board charge pump generates RS-232 compliant ±5V Tx
output levels from a single VCC supply as low as 4.5V. 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 ISL33354E and ISL33357E also include a shutdown
function, which disables the Tx and Rx outputs, disables the
charge pumps and places the IC in a low current (55µA) mode.
The ISL33357E is a QFN packaged device for space
constrained applications.
Related Literature
• For a full list of related documents, visit our website
- ISL33354E, ISL33357E product pages
Features
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• Operates from a single 5V 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 . . . . . . . . . . . . . . 460kbps (Minimum)
• Small charge pump capacitors . . . . . . . . . . . . . . . . 4 x 0.1µF
• Low current shutdown mode . . . . . . . . . . . . . . . . . . . . . . 55µA
• QFN package saves board space (ISL33357E 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
ISL33354E
ISL33357E
PACKAGE OPTION
28 Ld SSOP
40 Ld QFN (6 x 6mm)
TABLE 1. SUMMARY OF FEATURES
PORT 2
RS-485 DATA RATE
PORT 1
RS-232 DATA RATE
20M, 115k
650k
20M, 115k
650k
LOW POWER
SHUTDOWN?
YES
YES
PORT 2
RS-485 Rx AND Tx
YES
YES
October 21, 2016
FN8775.1
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  
ISL33354E, ISL33357E
PORT
1
2
2
SHDN
1
1
1
INPUTS
RE485
N.A.
0
0
DE485
N.A.
0
1
TABLE 3. ISL33354E AND ISL33357E FUNCTION TABLE
RECEIVER OUTPUTS
DRIVER OUTPUTS
SLOW485 RO
R1OUT
AND
R2OUT
Y AND Z
T1OUT AND
T2OUT
N.A. N.A.
ON
N.A.
ON
0 ON N.A. High-Z
N.A.
0 ON N.A.
ON
N.A.
CHARGE
PUMPS
(Note 4)
ON
ON
ON
2
1
1
1
0
High-Z
N.A.
ON
2 1 0 0 1 ON N.A. High-Z
2 1 0 1 1 ON N.A.
ON
N.A. ON
N.A. ON
N.A. ON
2
1
1
1
1
High-Z
N.A.
1 and 2
0
X
X
X
High-Z
High-Z
NOTE:
4. Charge pumps are off if SHDN = 0. If SHDN = 1, the charge pumps are on.
ON
High-Z
N.A.
High-Z
ON
OFF
DRIVER
DATA
RATE
(bps)
460k
115k
115k
115k
20M
20M
20M
N.A.
MODE
RS-232
RS-485 Rx
RS-485 Tx
and Rx
RS-485 Tx
RS-485 Rx
RS-485 Tx
and Rx
RS-485 Tx
Shutdown
Truth Tables
SHDN
1
1
1
1
0
RS-232 TRANSMITTING (PORT 1)
INPUTS
OUTPUTS
T1IN
T2IN
T1OUT
T2OUT
0011
0110
1001
1100
X
X
High-Z
High-Z
RS-485 TRANSMITTING (PORT 2)
INPUTS
OUTPUTS
SHDN DE485 DI SLOW485 Y
Z DATA RATE (bps)
110
0 01
115k
111
0 10
115k
110
1 01
20M
111
1 10
20M
10X
X High-Z High-Z
N.A.
0XX
X High-Z High-Z
N.A.
SHDN
1
1
1
1
1
0
RS-232 RECEIVING (PORT 1)
INPUTS
OUTPUTS
R1IN
R2IN
R1OUT
R2OUT
0011
0110
1001
1100
Open
Open
1
1
X
X
High-Z
High-Z
SHDN
1
1
1
1
0
RS-485 RECEIVING (PORT 2)
INPUTS
RE485
A-B
0 ≥-40mV
0 ≤-200mV
0 Open or shorted together
1X
XX
OUTPUT
RO
1
0
1
High-Z
High-Z
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5
FN8775.1
October 21, 2016
5 Page 
ISL33354E, ISL33357E
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
Submit Document Feedback 11
FN8775.1
October 21, 2016
11 Page | ||
| Páginas | Total 23 Páginas | |
| PDF Descargar | [ Datasheet ISL33354E.PDF ] | |
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