DATASHEET
ISL33354E, ISL33357E
FN8775
Rev 1.00
Oct 21, 2016
5V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485) Transceivers
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.
Features
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.
• Operates from a single 5V supply
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.
• ±15kV (HBM) ESD protected bus pins (RS-232 or RS-485)
• 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
Related Literature
• Gaming applications (e.g., slot machines)
• For a full list of related documents, visit our website
- ISL33354E, ISL33357E product pages
• Factory automation
• Single board computers
• Security networks
• Industrial/process control networks
• Level translators (e.g., RS-232 to RS-422)
• Point-of-sale equipment
TABLE 1. SUMMARY OF FEATURES
PART NUMBER
PACKAGE OPTION
PORT 2
RS-485 DATA RATE
PORT 1
RS-232 DATA RATE
LOW POWER
SHUTDOWN?
PORT 2
RS-485 Rx AND Tx
ISL33354E
28 Ld SSOP
20M, 115k
650k
YES
YES
ISL33357E
40 Ld QFN (6 x 6mm)
20M, 115k
650k
YES
YES
FN8775 Rev 1.00
Oct 21, 2016
Page 1 of 23
ISL33354E, ISL33357E
Ordering Information
PART NUMBER
(Notes 2, 3)
PART
MARKING
TEMPERATURE
RANGE (°C)
TAPE AND REEL
(UNITS)
PACKAGE
(RoHS COMPLIANT)
PKG. DWG. #
ISL33354EIAZ
33354 EIAZ
-40 to +85
-
28 Ld SSOP
M28.209
ISL33354EIAZ-T (Note 1)
33354 EIAZ
-40 to +85
1k
28 Ld SSOP
M28.209
ISL33357EIRZ
33357E IRZ
-40 to +85
-
40 Ld QFN
L40.6x6
ISL33357EIRZ-T (Note 1)
33357E IRZ
-40 to +85
1k
40 Ld QFN
L40.6x6
ISL33357EIRZ-T7A
(Note 1)
33357E IRZ
-40 to +85
250
40 Ld QFN
L40.6x6
NOTES:
1. Refer to TB347 for details on reel specifications.
2. 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.
3. For Moisture Sensitivity Level (MSL), see product information page for ISL33354E, ISL33357E. For more information on MSL, see tech brief TB363.
TABLE 2. KEY DIFFERENCES BETWEEN FAMILY OF PARTS
PART NUMBER
VCC
(V)
PKG
RS485 (bps)
DATA RATE
RS232 (bps)
DATA RATE
ISL33354E
5
28Ld SSOP
20M, 115k
650k
ISL33357E
5
40Ld QFN
20M, 115k
650k
ISL33334E
3.3
28Ld SSOP
20M, 115k
400k
ISL33337E
3.3
40Ld QFN
20M, 115k
400k
NOTE: For a full list of dual protocol transceivers, please visit our website.
Pin Configurations
26 VCC
V+ 3
R
R
D
T2OUT 7
3
T1OUT
4
5
*GND
6
NC
VCC
C2+
NC
C1+
VCC
C1-
35
34
33
32
31
PORT 1
30 R2OUT
R
29 R1OUT
R
28 T2IN
D
27 T1IN
D
26 *VCC
8
Z
9
A
10
23 DE485
22 RO
R
11
12
13
14
15
EP
16
17
18
19
20
NC
PORT 2 15 GND
Y
24 DI
D
V-
16 RE485
7
RE485
17 V-
*VCC
*GND
R
18 RO
GND
D
25 SHDN
PORT 2
GND
19 DE485
* NOT A SUPPLY PIN, BUT MUST BE CONNECTED TO THE
NOTED SUPPLY.
FN8775 Rev 1.00
Oct 21, 2016
T2OUT
36
*VCC
SLOW485 14
R2IN
22 T1IN
37
SLOW485
B 13
23 T2IN
38
20 DI
Y 10
A 12
2
21 SHDN
D
*VCC 9
Z 11
R1IN
24 R1OUT
39
NC
*GND 8
1
25 R2OUT
R2IN 5
T1OUT 6
V+
40
B
R1IN 4
27 C2-
NC
PORT 1
C1- 2
NC
28 C2+
C1+ 1
C2-
ISL33357E
(40 LD QFN)
TOP VIEW
ISL33354E
(28 LD SSOP)
TOP VIEW
21 DNC
Page 2 of 23
ISL33354E, ISL33357E
Pin Descriptions
PIN NAME
PIN #
for
SSOP
NC
-
12, 20, 32,
33, 39, 40
BOTH
No Internal Connection.
DNC
-
21
BOTH
Do not make any external connections to this pin.
SHDN
21
25
BOTH
A low on SHDN disables the charge pumps, disables all the outputs and places the device in low power
shutdown. Internally pulled-high. SHDN = 1 for normal operation.
VCC
26
31, 34
BOTH
System power supply input (4.5V to 5.5V). Both pins 31 and 34 must connect to the VCC supply.
GND
15
15, 16
BOTH
Ground connection. QFN pins 15 and 16 must both connect to GND. This is also the potential of the
QFN’s exposed metal pad (EP).
*VCC
9
7, 14, 26
BOTH
For proper operation, connect this lead to the VCC supply. This is not a power supply lead, so no decoupling
is required.
*GND
8
6, 17
BOTH
For proper operation, connect this lead to GND. This is not a power supply lead.
RxIN
4, 5
2, 3
1 / RS-232
RS-232 receiver input with ±15kV ESD protection. A low on RxIN forces RxOUT high; a high on RxIN
forces RxOUT low.
RxOUT
24, 25
29, 30
1 / RS-232
RS-232 receiver output.
TxIN
22, 23
27, 28
1 / RS-232
RS-232 transmitter input. A low on TxIN drives the corresponding TxOUT high, while a high on TxIN drives
the corresponding TxOUT low.
TxOUT
6, 7
4, 5
1 / RS-232
RS-232 transmitter output with ±15kV ESD protection.
C1+
1
37
1 / RS-232
External charge pump capacitor is connected to this lead.
C1-
2
38
1 / RS-232
External charge pump capacitor is connected to this lead.
C2+
28
36
1 / RS-232
External charge pump capacitor is connected to this lead.
C2-
27
35
1 / RS-232
External charge pump capacitor is connected to this lead.
V+
3
1
1 / RS-232
Internally generated positive RS-232 transmitter supply (+6V).
V-
17
19
1 / RS-232
Internally generated negative RS-232 transmitter supply (-7V).
A
12
10
2 / RS-485
RS-485 noninverting receiver input with ±15kV ESD protection.
B
13
11
2 / RS-485
RS-485 inverting receiver input with ±15kV ESD protection.
Y
10
8
2/ RS-485
RS-485 noninverting driver output with ±15kV ESD protection.
Z
11
9
2/ RS-485
RS-485 inverting driver output with ±15kV ESD protection.
DI
20
24
2 / RS-485
RS-485 driver input. A low on DI forces output Y low and output Z high.
RO
18
22
2 / RS-485
RS-485 receiver output: If A > B by at least -40mV, RO is high; If A < B by -200mV or more, RO is low;
RO = High if A and B are unconnected (floating) or shorted together (i.e., full fail-safe).
SLOW48
5
14
13
2 / RS-485
RS-485 data rate control. A low on SLOW485 selects the 115kbps RS-485 data rate (slew rate limited
output transitions); a high selects the 20Mbps data rate (full speed transitions). Internally pulled-high.
RE485
16
18
2/ RS-485
RS-485 active low receiver output enable. RO is enabled when RE485 is low; RO is high impedance
when RE485 is high. Internally pulled low.
DE485
19
23
2/ RS-485
RS-485 driver output enable (DE). The driver outputs, Y and Z, are enabled by driving DE485 high. They
are high impedance when DE485 is low. Internally pulled high.
EP
-
EP
BOTH
PIN # for
QFN
FN8775 Rev 1.00
Oct 21, 2016
PORT/MODE
FUNCTION
QFN exposed thermal pad (EPAD). Connect to GND.
Page 3 of 23
ISL33354E, ISL33357E
Typical Operating Circuits
+5V
+
C1
0.1µF
+
C2
0.1µF
+
R1IN
R2IN
T2OUT
T1OUT
B
A
0.1µF
1
2
28
27
9, 26
C1+
VCC
V+
3
+ C3
0.1µF
C1C2+
V- 17
C2-
4
5k?
5
5k?
24
R
25
R
7
D
6
D
23
22
C4
0.1µF
+
R1OUT
R2OUT
T2IN
T1IN
13
12
R
18
RO
16
RE485
Z
Y
11
10
D
20
DI
19
DE485
21
VCC
SHDN
14
VCC
SLOW485
GND
8, 15
NOTE: PINOUT FOR SSOP
FIGURE 1. 1 PORT IN RS-232 MODE AND 1 PORT IN RS-485 MODE
FN8775 Rev 1.00
Oct 21, 2016
Page 4 of 23
ISL33354E, ISL33357E
TABLE 3. ISL33354E AND ISL33357E FUNCTION TABLE
INPUTS
RECEIVER OUTPUTS
DRIVER OUTPUTS
Y AND Z
T1OUT AND
T2OUT
CHARGE
PUMPS
(Note 4)
DRIVER
DATA
RATE
(bps)
MODE
PORT
SHDN
RE485
DE485
SLOW485
RO
R1OUT
AND
R2OUT
1
1
N.A.
N.A.
N.A.
N.A.
ON
N.A.
ON
ON
460k
RS-232
2
1
0
0
0
ON
N.A.
High-Z
N.A.
ON
115k
RS-485 Rx
2
1
0
1
0
ON
N.A.
ON
N.A.
ON
115k
RS-485 Tx
and Rx
2
1
1
1
0
High-Z
N.A.
ON
N.A.
ON
115k
RS-485 Tx
2
1
0
0
1
ON
N.A.
High-Z
N.A.
ON
20M
RS-485 Rx
2
1
0
1
1
ON
N.A.
ON
N.A.
ON
20M
RS-485 Tx
and Rx
2
1
1
1
1
High-Z
N.A.
ON
N.A.
ON
20M
RS-485 Tx
1 and 2
0
X
X
X
High-Z
High-Z
High-Z
High-Z
OFF
N.A.
Shutdown
NOTE:
4. Charge pumps are off if SHDN = 0. If SHDN = 1, the charge pumps are on.
Truth Tables
RS-485 TRANSMITTING (PORT 2)
INPUTS
RS-232 TRANSMITTING (PORT 1)
INPUTS
OUTPUTS
OUTPUTS
SHDN
DE485
DI
SLOW485
Y
Z
DATA RATE (bps)
SHDN
T1IN
T2IN
T1OUT
T2OUT
1
1
0
0
0
1
115k
1
0
0
1
1
1
1
1
0
1
0
115k
1
0
1
1
0
1
1
0
1
0
1
20M
1
1
0
0
1
1
1
1
1
1
0
20M
1
1
1
0
0
1
0
X
X
High-Z High-Z
N.A.
0
X
X
High-Z
High-Z
0
X
X
X
High-Z High-Z
N.A.
RS-485 RECEIVING (PORT 2)
RS-232 RECEIVING (PORT 1)
INPUTS
INPUTS
OUTPUTS
OUTPUT
SHDN
R1IN
R2IN
R1OUT
R2OUT
SHDN
RE485
A-B
RO
1
0
0
1
1
1
0
≥-40mV
1
1
0
1
1
0
1
0
≤-200mV
0
1
1
0
0
1
1
0
Open or shorted together
1
1
1
1
0
0
1
1
X
High-Z
1
Open
Open
1
1
0
X
X
High-Z
0
X
X
High-Z
High-Z
FN8775 Rev 1.00
Oct 21, 2016
Page 5 of 23
ISL33354E, ISL33357E
Absolute Maximum Ratings (TA = +25°C)
Thermal Information
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
All Except A, B, RxIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to 7V
Input/Output Voltages
A, B, RxIN . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -25V to +25V
Y, Z, TxOUT (Note 5). . . . . . . . . . . . . . . . . . . . . . . . . . . . . -12.5V to +12.5V
RO, RxOUT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.5V to (VCC + 0.5V)
Output Short-Circuit Duration
Y, Z, TxOUT, RxOUT. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . See Specification Table on page 7
Latch-Up (per JESD78, Level 2, Class A). . . . . . . . . . . . . . . . . . . . . . . +85°C
JA (°C/W) JC (°C/W)
Thermal Resistance (Typical)
28 Ld SSOP Package (Notes 7, 9) . . . . . . . .
60
36
40 Ld QFN Package (Notes 6, 8) . . . . . . . . .
32
2.5
Maximum Junction Temperature (Plastic Package) . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . -65°C to +150°C
Pb-Free Reflow Profile. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
Recommended Operating Conditions
Supply Voltage (VCC) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Temperature Range. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
RS-485 Tx Load . . . . . . . . . . . . . . . . . . . . . . One or two 120Ω Terminations
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5. One output at a time, IOUT ≤ 100mA for ≤10 mins.
6. JA is measured in free air with the component mounted on a high effective thermal conductivity test board with “direct attach” features. See Tech
Brief TB379.
7. JA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
8. For JC, the “case temp” location is the center of the exposed metal pad on the package underside.
9. For JC, the “case temp” location is taken at the package top center.
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, unless otherwise specified. Typicals are at VCC = 5V,
TA = +25°C (Note 10). Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
TEMP
(°C)
MIN
(Note 15)
TYP
MAX
(Note 15)
UNIT
Full
-
-
VCC
V
R = 50Ω (RS-422) (Figure 2)
Full
2.5
3.1
-
V
R = 27Ω (RS-485) (Figure 2)
Full
2.2
2.7
5
V
VOD3
RD = 60Ω, R = 375Ω, VCM = -7V to 12V (Figure 2)
Full
2
2.7
5
V
VOD
R = 27Ω or 50Ω (Figure 2)
Full
-
0.01
0.2
V
SYMBOL
TEST CONDITIONS
DC CHARACTERISTICS - RS-485 DRIVER (Port 2)
Driver Differential VOUT (No Load)
VOD1
Driver Differential VOUT (with Load)
VOD2
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
Driver Common-Mode VOUT
VOC
R = 27Ω or 50Ω (Figure 2) (Note 14)
Full
-
-
3.1
V
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
VOC
R = 27Ω or 50Ω (Figure 2) (Note 14)
Full
-
0.01
0.2
V
Full
35
-
250
mA
VOUT = 12V
Full
-
-
500
µA
VOUT = -7V
Full
-200
-
-
µA
Driver Short-Circuit Current,
VOUT = High or Low
IOS
-7V ≤ (VY or VZ) ≤ 12V (Note 12)
Driver Three-State Output Leakage
Current (Y, Z)
IOZ
Outputs disabled,
VCC = 0V or 5.5V
DC CHARACTERISTICS - RS-232 DRIVER (PORT 1)
Driver Output Voltage Swing
VO
All TOUTS loaded with 3kΩ to ground
Full
±5
+6/-7
-
V
Driver Output Short-Circuit Current
IOS
VOUT = 0V
Full
-60
25/-35
60
mA
DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS)
Input High Voltage
VIH
Full
2
1.6
-
V
Input Low Voltage
VIL
Full
-
1.4
0.8
V
FN8775 Rev 1.00
Oct 21, 2016
Page 6 of 23
ISL33354E, ISL33357E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, unless otherwise specified. Typicals are at VCC = 5V,
TA = +25°C (Note 10). (Continued) Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
Input Current
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 15)
TYP
MAX
(Note 15)
UNIT
IIN1
Pins without pull-ups or pull-downs
Full
-2
-
2
µA
IIN2
SLOW485, DE485, RE485, SHDN
Full
-25
-
25
µA
-7V ≤ VCM ≤ 12V, full fail-safe
Full
-0.2
-
-0.04
V
VCM = 0V
25
-
35
-
mV
VIN = 12V
Full
-
-
0.8
mA
VIN = -7V
Full
-0.64
-
-
mA
Full
15
-
-
kΩ
DC CHARACTERISTICS - RS-485 RECEIVER INPUTS (PORT 2)
Receiver Differential Threshold
Voltage
Receiver Input Hysteresis
Receiver Input Current (A, B)
Receiver Input Resistance
V TH
V TH
IIN
RIN
VCC = 0V or 4.5 to 5.5V
-7V ≤ VCM ≤ 12V, VCC = 0 (Note 13) or
4.5V ≤ VCC ≤ 5.5V
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (PORT 1)
Receiver Input Voltage Range
VIN
Full
-25
-
25
V
Receiver Input Threshold
VIL
Full
-
1.4
0.8
V
VIH
Full
2.4
1.9
-
V
Receiver Input Hysteresis
V TH
25
-
0.5
-
V
Receiver Input Resistance
RIN
Full
3
5
7
kΩ
VIN = ±15V, VCC powered up (Note 13)
DC CHARACTERISTICS - RECEIVER OUTPUTS (PORTS 1 and 2)
Receiver Output High Voltage
VOH
IO = -2mA
Full
3.5
4.6
-
V
Receiver Output Low Voltage
VOL
IO = 3mA
Full
-
0.1
0.4
V
Receiver Short-Circuit Current
IOSR
0V ≤ VO ≤ VCC
Full
7
-
85
mA
Receiver Three-State Output Current
IOZR
Output disabled, 0V ≤ VO ≤ VCC
Full
-
-
±10
µA
ICC
SHDN = VCC
Full
-
3.7
7
mA
SHDN = SLOW485 = GND, RE485 = VCC,
DE485 = GND
Full
-
55
160
µA
Bus Pins (A, B, Y, Z, RxIN, TxOUT)
Human body model, Bus pin to GND
25
-
±15
-
kV
All Other Pins
Human body model (per JEDEC)
25
-
±4
-
kV
Machine model (per JEDEC)
25
-
±200
-
V
CL ≥15pF
Full
-
18
30
V/µs
CL ≤2500pF
Full
4
12
-
V/µs
RL = 3kΩ, CL = 2500pF, 10% - 90%
Full
0.22
1.2
3.1
µs
RL = 3kΩ CL = 1000pF (Figure 7)
Full
-
1
2
µs
Full
-
1.2
2
µs
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current, (Note 11)
Shutdown Supply Current
ISHDN
ESD CHARACTERISTICS
RS-232 DRIVER AND RECEIVER SWITCHING CHARACTERISTICS (PORT 1)
Driver Output Transition Region
Slew Rate
SR
Driver Output Transition Time
tr, tf
Driver Propagation Delay
tDPHL
RL = 3kΩ, measured from
3V to -3V or -3V to 3V
tDPLH
Driver Propagation Delay Skew
tDSKEW
tDPHL - tDPLH (Figure 7)
Full
-
240
400
ns
Driver Enable Time from Shutdown
tDENSD
VOUT = ±3.0V, CL = 1000pF
25
-
20
-
µs
RL = 3kΩ, CL = 1000pF, one transmitter
switching
Full
460
650
-
kbps
Driver Maximum Data Rate
FN8775 Rev 1.00
Oct 21, 2016
DRD
Page 7 of 23
ISL33354E, ISL33357E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, unless otherwise specified. Typicals are at VCC = 5V,
TA = +25°C (Note 10). (Continued) Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
Receiver Propagation Delay
TEMP
(°C)
MIN
(Note 15)
TYP
MAX
(Note 15)
UNIT
Full
-
50
120
ns
Full
-
40
120
ns
tRPHL - tRPLH (Figure 8)
Full
-
10
40
ns
CL = 15pF
Full
0.46
2
-
Mbps
Full
15
30
50
ns
SYMBOL
tRPHL
TEST CONDITIONS
CL = 15pF (Figure 8)
tRPLH
Receiver Propagation Delay Skew
Receiver Maximum Data Rate
tRSKEW
DRR
RS-485 DRIVER SWITCHING CHARACTERISTICS (FAST DATA RATE (20Mbps), PORT 2, (SLOW485 = VCC))
Driver Differential Input to Output
Delay
tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 3)
Driver Output Skew
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
-
3
10
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF, (Figure 3)
Full
3
11
20
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 4)
Full
-
27
60
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 4)
Full
-
24
60
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 4)
Full
-
31
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 4)
Full
-
24
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 4)
Full
-
65
250
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 500Ω, CL = 100pF, SW = GND (Figure 4)
Full
-
152
250
ns
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
-
30
-
Mbps
Driver Maximum Data Rate
fMAX
RS-485 DRIVER SWITCHING CHARACTERISTICS (SLOW DATA RATE (115kbps), PORT 2, (SLOW485 = GND))
Driver Differential Input to Output
Delay
tDLH, tDHL RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
800
1500
2500
ns
Driver Output Skew
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
-
350
1250
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
1000
2000
3100
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 4)
Full
-
32
600
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 4)
Full
-
300
600
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 4)
Full
-
31
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 4)
Full
-
24
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 4)
Full
-
65
800
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 500Ω, CL = 100pF, SW = GND (Figure 4)
Full
-
420
800
ns
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
-
800
-
kbps
Driver Maximum Data Rate
fMAX
RS-485 RECEIVER SWITCHING CHARACTERISTICS (PORT 2, ALL SPEEDS)
Receiver Input to Output Delay
tPLH, tPHL
(Figure 5)
Full
20
50
90
ns
Receiver Skew | tPLH - tPHL |
tSKEW
(Figure 5)
Full
-
0.1
10
ns
Receiver Maximum Data Rate
fMAX
Full
-
40
-
Mbps
Receiver Enable to Output Low
tZL
CL = 15pF, SW = VCC (Figure 6)
Full
-
22
60
ns
Receiver Enable to Output High
tZH
CL = 15pF, SW = GND (Figure 6)
Full
-
23
60
ns
Receiver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 6)
Full
-
24
60
ns
Receiver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 6)
Full
-
25
60
ns
FN8775 Rev 1.00
Oct 21, 2016
Page 8 of 23
ISL33354E, ISL33357E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V, C1 - C4 = 0.1µF, unless otherwise specified. Typicals are at VCC = 5V,
TA = +25°C (Note 10). (Continued) Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
Receiver Enable from Shutdown to
Output Low
tZLSHDN
Receiver Enable from Shutdown to
Output High
tZHSHDN
TEMP
(°C)
MIN
(Note 15)
TYP
MAX
(Note 15)
UNIT
CL = 15pF, SW = VCC (Figure 6)
Full
-
260
700
ns
CL = 15pF, SW = GND (Figure 6)
Full
-
260
700
ns
TEST CONDITIONS
NOTES:
10. All currents into device pins are positive; all currents out of device pins are negative. All voltages are referenced to device ground unless otherwise
specified.
11. Supply current specification is valid for loaded RS-485 (port 2) drivers when DE485 = 0V.
12. Applies to peak current. See “Typical Performance Curves” on page 12 for more information.
13. A, B, RxIN defaults to RS-485 mode (>15kΩ) when the device is unpowered (VCC = 0V), or in SHDN.
14. VCC ≤ 5.25V.
15. Compliance to datasheet limits is assured by one or more methods: production test, characterization and/or design.
Test Circuits and Waveforms
R
DE485
VCC
Z
DI
RD
D
VOD
Y
VOC
R
FIGURE 2. RS-485 DRIVER VOD AND VOC TEST CIRCUIT
3V
DI
50%
50%
0V
tPLH
tPHL
VOH
50%
OUT (Y)
50%
VOL
tPHL
tPLH
VOH
VCC
CL = 100pF
DE485
OUT (Z)
50%
VOL
tDLH
Z
DI
RDIFF
D
Y
SIGNAL
GENERATOR
CL = 100pF
50%
90%
DIFF OUT (Y - Z)
10%
tDHL
0V
0V
+VOD
90%
10%
-VOD
tF
tR
SKEW = |tPLH (Y or Z) - tPHL (Z or Y)|
FIGURE 3A. TEST CIRCUIT
FIGURE 3B. MEASUREMENT POINTS
FIGURE 3. RS-485 DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FN8775 Rev 1.00
Oct 21, 2016
Page 9 of 23
ISL33354E, ISL33357E
Test Circuits and Waveforms (Continued)
DE485
Z
DI
500?
VCC
D
SIGNAL
GENERATOR
GND
SW
Y
ENABLED
DE485
(SHDN FOR SHDN)
3V
50%
50%
0V
CL
tZH
tZH(SHDN)
FOR SHDN TESTS, SWITCH SHDN RATHER THAN DE485
PARAMETER SHDN/DE485 OUTPUT
OUTPUT HIGH
OUT (Y, Z)
DI
SW
CL (pF)
tHZ
1/-
Y/Z
1/0
GND
15
tLZ
1/-
Y/Z
0/1
VCC
15
tZH
1/-
Y/Z
1/0
GND
100
tZL
1/-
Y/Z
0/1
VCC
100
tZH(SHDN)
-/1
Y/Z
1/0
GND
100
tZL(SHDN)
-/1
Y/Z
0/1
VCC
100
tHZ
VOH - 0.5V VOH
2.3V
0V
tZL
tZL(SHDN)
tLZ
VCC
OUT (Y, Z)
2.3V
OUTPUT LOW
VOL + 0.5V V
OL
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4A. TEST CIRCUIT
FIGURE 4. RS-485 DRIVER ENABLE AND DISABLE TIMES
RE485
0V
+1.5V
15pF
B
R
A
A
RO
0V
0V
-1.5V
tPLH
tPHL
VCC
SIGNAL
GENERATOR
RO
1.5V
1.5V
0V
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5A. TEST CIRCUIT
FIGURE 5. RS-485 RECEIVER PROPAGATION DELAY
RE485
B
R
SIGNAL
GENERATOR
1k?
RO
VCC
SW
A
GND
SHDN
(FOR SHDN TESTS)
3V
1.5V
15pF
0V
ENABLED
RE485
1.5V
FOR SHDN TESTS, SWITCH SHDN RATHER THAN RE485
3V
1.5V
0V
PARAMETER
SHDN/RE485
A
SW
tHZ
1/-
+1.5V
GND
tLZ
1/-
-1.5V
VCC
tZH
1/-
+1.5V
GND
tZH
tZH(SHDN)
RO
OUTPUT HIGH
tHZ
VOH - 0.5V VOH
1.5V
0V
tZL
1/-
-1.5V
VCC
tZH(SHDN)
-/0
+1.5V
GND
tZL
tZL(SHDN)
tZL(SHDN)
-/0
-1.5V
VCC
RO
tLZ
VCC
1.5V
OUTPUT LOW
FIGURE 6A. TEST CIRCUIT
VOL + 0.5V V
OL
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. RS-485 RECEIVER ENABLE AND DISABLE TIMES
FN8775 Rev 1.00
Oct 21, 2016
Page 10 of 23
ISL33354E, ISL33357E
Test Circuits and Waveforms (Continued)
3V
SHDN
VCC
TxIN
TxIN
D
1.5V
1.5V
CL
TxOUT
0V
tDPHL
RL
SIGNAL
GENERATOR
tDPLH
VO+
TxOUT
0V
0V
VO-
SKEW = |tDPHL - tDPLH|
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7A. TEST CIRCUIT
FIGURE 7. RS-232 DRIVER PROPAGATION DELAY AND TRANSITION TIMES
3V
SHDN
VCC
RxIN
RxIN
RxOUT
R
50%
50%
CL = 15pF
0V
tRPLH
tRPHL
SIGNAL
GENERATOR
VOH
RxOUT
50%
50%
VOL
SKEW = |tRPHL - tRPLH|
FIGURE 8A. TEST CIRCUIT
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RS-232 RECEIVER PROPAGATION DELAY AND TRANSITION TIMES
FN8775 Rev 1.00
Oct 21, 2016
Page 11 of 23
ISL33354E, ISL33357E
Typical Performance Curves
VCC = 5V, TA = +25°C, unless otherwise specified
100
VOL, +25°C
DRIVER OUTPUT CURRENT (mA)
RECEIVER OUTPUT CURRENT (mA)
50
40
VOL, +85°C
30
20
VOH, +25°C
VOH, +85°C
10
0
0
1
2
3
4
RECEIVER OUTPUT VOLTAGE (V)
90
80
70
60
50
40
30
20
10
0
5
FIGURE 9. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT
VOLTAGE
0
1
2
3
4
DIFFERENTIAL OUTPUT VOLTAGE (V)
5
FIGURE 10. RS-485, DRIVER OUTPUT CURRENT vs DIFFERENTIAL
OUTPUT VOLTAGE
150
Y OR Z = LOW
100
OUTPUT CURRENT (mA)
DIFFERENTIAL OUTPUT VOLTAGE (V)
3.6
3.5
RDIFF = 100Ω
3.4
3.3
3.2
RDIFF = 54Ω
3.1
FULL TEMP RANGE
50
0
Y OR Z = HIGH
-50
+25°C
+85°C
-100
-40°C
3.0
-40
-25
0
50
25
75
-150
85
-7 -6
-4
-2
TEMPERATURE (°C)
FIGURE 11. RS-485, DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
4.0
0
2
4
6
OUTPUT VOLTAGE (V)
8
10
12
FIGURE 12. RS-485, DRIVER OUTPUT CURRENT vs SHORT-CIRCUIT
VOLTAGE
SHDN = VCC
3.5
ICC (mA)
3.0
2.5
2.0
1.5
1.0
-40
-25
0
25
50
75
85
TEMPERATURE (°C)
FIGURE 13. SUPPLY CURRENT vs TEMPERATURE
FN8775 Rev 1.00
Oct 21, 2016
Page 12 of 23
ISL33354E, ISL33357E
Typical Performance Curves
VCC = 5V, TA = +25°C, unless otherwise specified (Continued)
400
1700
RDIFF = 54?, CL = 100pF
RDIFF = 54?, CL = 100pF
350
|tPHLZ - tPLHY|
300
1600
SKEW (ns)
tDHL
1550
tDLH
1500
200
150
100
tDHL
1450
|tPLHZ - tPHLY|
250
|tDLH - tDHL|
50
1400
-40
-25
0
25
50
75
85
-40
0
-25
TEMPERATURE (°C)
FIGURE 14. RS-485, DRIVER PROPAGATION DELAY vs
TEMPERATURE (SLOW DATA RATE)
2.5
RDIFF = 54?, CL = 100pF
RDIFF = 54?, CL = 100pF
2.0
35
|tDLH - tDHL|
tDHL
30
tDLH
1.5
1.0
|tPLHZ - tPHLY|
25
0.5
20
-40
-25
0
25
50
|tPHLZ - tPLHY|
0
-40
-25
85
75
TEMPERATURE (°C)
5
0
5
RO
0
4
3
2
DRIVER OUTPUT (V)
5
Z
Y
1
0
TIME (400ns/DIV)
FIGURE 18. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (SLOW DATA RATE)
FN8775 Rev 1.00
Oct 21, 2016
RECEIVER OUTPUT (V)
DI
25
50
75
85
FIGURE 17. RS-485, DRIVER SKEW vs TEMPERATURE
(FAST DATA RATE)
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
RDIFF = 60?, CL = 100pF
0
TEMPERATURE (°C)
FIGURE 16. RS-485, DRIVER PROPAGATION DELAY vs
TEMPERATURE (FAST DATA RATE)
DRIVER OUTPUT (V)
85
75
FIGURE 15. RS-485, DRIVER SKEW vs TEMPERATURE
(SLOW DATA RATE)
SKEW (ns)
PROPAGATION DELAY (ns)
40
50
25
TEMPERATURE (°C)
RDIFF = 60?, CL = 100pF
DI
5
5
0
RO
0
DRIVER INPUT (V)
PROPAGATION DELAY (ns)
1650
5
4
3
2
1
Y
Z
0
TIME (400ns/DIV)
FIGURE 19. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (SLOW DATA RATE)
Page 13 of 23
ISL33354E, ISL33357E
DI
0
5
RO
0
5
4
Z
3
2
RDIFF = 60?, CL = 100pF
Y
1
0
0
5
RO
0
5
4
Y
3
2
Z
1
0
TIME (200ns/DIV)
TIME (10ns/DIV)
FIGURE 21. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (FAST DATA RATE)
FIGURE 20. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (FAST DATA RATE)
VOUT+
2.5
BOTH TOUTS LOADED WITH 3k? TO GND
0
500kbps
2 TRANSMITTERS AT 250kbps OR 500kbps
-2.5
500kbps
-5.0
-7.5
VOUT 250kbps
0
1000
2000
3000
4000
5000
TRANSMITTER OUTPUT VOLTAGE (V)
7.5
250kbps
RS-232 REGION OF NONCOMPLIANCE
TRANSMITTER OUTPUT VOLTAGE (V)
7.5
5.0
5
DI
DRIVER INPUT (V)
5
RECEIVER OUTPUT (V)
RDIFF = 60?, CL = 100pF
DRIVER INPUT (V)
VCC = 5V, TA = +25°C, unless otherwise specified (Continued)
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
RECEIVER OUTPUT (V)
Typical Performance Curves
5.0
VOUT+
2.5
OUTPUTS STATIC
BOTH TOUTS LOADED WITH 3k? TO GND
0
-2.5
-5.0
VOUT -
-7.5
-40
-25
0
25
50
75
85
TEMPERATURE (°C)
LOAD CAPACITANCE (pF)
FIGURE 23. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
TEMPERATURE
FIGURE 22. RS-232, TRANSMITTER OUTPUT VOLTAGE vs LOAD
CAPACITANCE
TRANSMITTER OUTPUT CURRENT (mA)
40
30
5V
Y or Z = LOW
20
0
10
0
CL = 3500pF, 2 CHANNELS SWITCHING
TxIN
5V
VOUT SHORTED TO GND
TxOUT/RxIN
0
-10
-5V
-20
5V
Y or Z = HIGH
-30
RxOUT
0
-40
-40
-25
0
50
25
TEMPERATURE (°C)
75
85
FIGURE 24. RS-232, TRANSMITTER SHORT-CIRCUIT CURRENT vs
TEMPERATURE
FN8775 Rev 1.00
Oct 21, 2016
2µs/DIV
FIGURE 25. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS AT
250kbps
Page 14 of 23
ISL33354E, ISL33357E
Typical Performance Curves
VCC = 5V, TA = +25°C, unless otherwise specified (Continued)
60
5V
RECEIVER + DUTY CYCLE (%)
CL = 1000pF, 2 CHANNELS SWITCHING
TxIN
0
5V
TxOUT/RxIN
0
-5V
5V
VIN = 5V
FULL TEMP RANGE
58
56
54
SR IN = 15V/µs
52
SR IN = 100V/µs
50
RxOUT
0
48
500
50
1µs/DIV
FIGURE 26. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS AT
500kbps
1500
2000
FIGURE 27. RS-232, RECEIVER OUTPUT + DUTY CYCLE vs DATA RATE
1000
BOTH TOUTS LOADED WITH 5k? TO GND
900
800
700
2 TRANSMITTERS AT +25°C
600
1 TRANSMITTER AT +25°C
500
400
300
1 TRANSMITTER AT +85°C
200
2 TRANSMITTERS AT +85°C
100
100
1000
2000
3000
LOAD CAPACITANCE (pF)
VOUT+
5.0
+25°C
+85°C
2.5
2 TRANSMITTERS SWITCHING
0
BOTH TOUTS LOADED WITH 5kΩ TO GND, CL = 1000pF
-2.5
+85°C
-5.0
VOUT -
+25°C
-7.5
4000
0
5000
100
200
300
400
500
600
700
800
DATA RATE (kbps)
FIGURE 28. RS-232, TRANSMITTER MAXIMUM DATA RATE vs LOAD
CAPACITANCE
FIGURE 29. RS-232, TRANSMITTER OUTPUT VOLTAGE vs DATA RATE
Die Characteristics
SUBSTRATE AND QFN PAD POTENTIAL
(POWERED UP):
450
2 TRANSMITTERS SWITCHING
400
BOTH TOUTS LOADED WITH 3k? TO GND, CL = 1000pF
GND
PROCESS:
SKEW (ns)
350
+85°C
BiCMOS
300
250
+25°C
200
150
50
150
250
350
450
550
650
750
DATA RATE (kbps)
FIGURE 30. RS-232, TRANSMITTER SKEW vs DATA RATE
FN8775 Rev 1.00
Oct 21, 2016
RS-232 REGION OF NONCOMPLIANCE
VOUT ±4V
TRANSMITTER OUTPUT VOLTAGE (V)
7.5
1100
DATA RATE (kbps)
1000
DATA RATE (kbps)
Page 15 of 23
ISL33354E, ISL33357E
Typical Application
Detailed Description
RS-232 to RS-485 Converter
Each of the ISL3335XE parts supports dual protocols:
RS-485/422 (port 2), and RS-232 (port 1). RS-485 and RS-422
are differential (balanced) data transmission standards for use
in high speed (up to 20Mbps) networks, or long haul and noisy
environments. The differential signaling, coupled with RS-485’s
requirement for an extended Common-Mode Range (CMR) of
+12V to -7V make these transceivers extremely tolerant of
ground potential differences, as well as voltages induced in the
cable by external fields. Both of these effects are real concerns
when communicating over the RS-485/422 maximum distance
of 4000’ (1220m).
The ISL33354E, ISL33357E are ideal for implementing a single
IC 2-wire (Tx Data, Rx Data) protocol converter, because each
port is programmed for a different protocol. Figure 31 illustrates
the simple connections to create a single transceiver RS-232 to
RS-422 converter. Depending on the RS-232 data rate, using an
RS-422 bus as an RS-232 “extension cord” can extend the
transmission distance up to 4000’ (1220m). A similar circuit on
the other end of the cable completes the conversion to/from
RS-232.
+5V
C1
0.1µF
C2
0.1µF
+ 0.1µF
1
C1+
2
C128
C2+
+
27
C2+
NC
4 R1IN
TxD
RS-232 IN
5 R2IN
5kΩ
5kΩ
NC
6 T1OUT
RxD
RS-232 OUT
7 T2OUT
RS-422 IN
RS-422 OUT
13
B
12
A
11
Z
10
Y
9, 26
VCC
V+
3
+C3
0.1µF
V- 17
+ C4
0.1µF
R1OUT 24
NC
R
R
R2OUT 25
D
D
Conversely, RS-485 is a true multipoint standard, which allows
up to 32 devices (any combination of drivers - must be
tri-statable - and receivers) on each bus. Now, bidirectional
communication takes place on a single bus, so the Rx inputs
and Tx outputs of a port connect to the same bus lines, as
shown in Figure 32. Port 2 is set to RS-485/422 mode and
includes one Rx and one Tx.
T1IN 22
T2IN 23
RO
R
RS-232 is a point-to-point, single ended (signal voltages
referenced to GND) communication protocol targeting fairly
short (