DATASHEET
ISL33334E, ISL33337E
FN8776
Rev 1.00
October 21, 2016
3.3V, ±15kV ESD Protected, Two Port, Dual Protocol (RS-232/RS-485)
Transceivers
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.
Features
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.
• Operates from a single 3.3V 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.
• ±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 . . . . . . . . . . . . . . . . . . . . up to 400kbps
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.
• Small charge pump capacitors . . . . . . . . . . . . . . . . 4 x 0.1µF
The ISL33337E is a QFN packaged device for space
constrained applications.
Applications
Related Literature
• Gaming applications (e.g., slot machines)
• For a full list of related documents, visit our website
- ISL33334E, ISL33337E product pages
• Low current shutdown mode . . . . . . . . . . . . . . . . . . . . . . 40µA
• QFN package saves board space (ISL33337E only)
• Single board computers
• Factory automation
• 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 (bps)
PORT 1
RS-232 DATA RATE (bps)
LOW POWER
SHUTDOWN?
PORT 2
RS-485 Rx AND Tx ENABLE?
ISL33334E
28 Ld SSOP
20M, 115k
400k
YES
YES
ISL33337E
40 Ld QFN (6x6mm)
20M, 115k
400k
YES
YES
FN8776 Rev 1.00
October 21, 2016
Page 1 of 23
ISL33334E, ISL33337E
Ordering Information
PART NUMBER
(Notes 2, 3)
PART MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(UNITS)
PACKAGE
(RoHS COMPLIANT)
PKG.
DWG. #
ISL33334EIAZ
33334E IAZ
-40 to +85
-
28 Ld SSOP
M28.209
ISL33334EIAZ-T (Notes 1)
33334E IAZ
-40 to +85
1k
28 Ld SSOP
M28.209
ISL33337EIRZ
33337E IRZ
-40 to +85
-
40 Ld QFN
L40.6x6
ISL33337EIRZ-T (Notes 1)
33337E IRZ
-40 to +85
1k
40 Ld QFN
L40.6x6
ISL33337EIRZ-T7A (Notes 1) 33337E 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 ISL33334E, ISL33337E. 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
23 T2IN
R2IN
3
22 T1IN
T1OUT
4
T2OUT
5
19 DE485
*GND
6
18 RO
*VCC
7
16 RE485
PORT 2 15 GND
Y
8
Z
9
A
* NOT A SUPPLY PIN, BUT MUST BE CONNECTED TO THE
NOTED SUPPLY.
FN8776 Rev 1.00
October 21, 2016
31
PORT 1
30 R2OUT
R
29 R1OUT
R
28 T2IN
D
27 T1IN
D
26 *VCC
25 SHDN
PORT 2
24 DI
D
23 DE485
22 RO
R
EP
10
11
12
13
14
15
16
17
18
19
20
*VCC
R
17 V-
32
V-
D
33
RE485
20 DI
34
*GND
21 SHDN
D
VCC
C2+
2
24 R1OUT
NC
C1+
R1IN
NC
C1-
1
VCC
NC
V+
35
GND
SLOW485 14
36
GND
B 13
37
*VCC
D
Y 10
Z 11
38
SLOW485
R
*VCC 9
A 12
39
25 R2OUT
T2OUT 7
*GND 8
40
26 VCC
R
R2IN 5
T1OUT 6
27 C2-
*VCC
V+ 3
R1IN 4
28 C2+
NC
PORT 1
C1- 2
B
C1+ 1
C2-
ISL33337E
(40 LD QFN)
TOP VIEW
ISL33334E
(28 LD SSOP)
TOP VIEW
21 DNC
Page 2 of 23
ISL33334E, ISL33337E
Pin Descriptions
PIN NAME
PIN # for
SSOP
PIN # for
QFN
PORT/
MODE
NC
-
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 (3.15V to 3.45V). 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
12, 20, 7, BOTH
14, 26
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
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 (+5.5V).
V-
17
19
1 / RS-232 Internally generated negative RS-232 transmitter supply (-5.5V).
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).
SLOW485
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
32, 33, 39, BOTH
40
FUNCTION
No Internal Connection.
For proper operation, connect this lead to GND. This is not a power supply lead.
QFN exposed thermal pad (EPAD). Connect to GND.
TABLE 3. ISL33334E AND ISL33337E FUNCTION TABLE
INPUTS
RECEIVER OUTPUTS
Y AND Z
N.A.
PORT
SHDN
RE485
DE485
SLOW485
RO
R1OUT
AND
R2OUT
1
1
N.A.
N.A.
N.A.
N.A.
ON
FN8776 Rev 1.00
October 21, 2016
DRIVER OUTPUTS
T1OUT AND
T2OUT
CHARGE
PUMPS
(Note 4)
DRIVER
DATA
RATE
(bps)
ON
ON
400k
MODE
RS-232
Page 3 of 23
ISL33334E, ISL33337E
TABLE 3. ISL33334E AND ISL33337E 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
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)
RS-232 TRANSMITTING (PORT 1)
INPUTS
INPUTS
OUTPUTS
OUTPUTS
SHDN
T1IN
T2IN
T1OUT
T2OUT
SHDN
DE485
DI
SLOW485
Y
Z
DATA RATE
(bps)
1
0
0
1
1
1
1
0
0
0
1
115k
1
0
1
1
0
1
1
1
0
1
0
115k
1
1
0
0
1
1
1
0
1
0
1
20M
1
1
1
0
0
1
1
1
1
1
0
20M
0
X
X
High-Z
High-Z
1
0
X
X
High-Z High-Z
N.A.
0
X
X
X
High-Z High-Z
N.A.
RS-232 RECEIVING (PORT 1)
INPUTS
OUTPUTS
SHDN
R1IN
R2IN
R1OUT
R2OUT
1
0
0
1
1
1
0
1
1
0
1
1
0
0
1
1
1
1
0
0
1
Open
Open
1
1
0
X
X
High-Z
High-Z
FN8776 Rev 1.00
October 21, 2016
RS-485 RECEIVING (PORT 2)
INPUTS
OUTPUT
SHDN
RE485
A-B
RO
1
0
≥-40mV
1
1
0
≤-200mV
0
1
0
Open or Shorted together
1
1
1
X
High-Z
0
X
X
High-Z
Page 4 of 23
ISL33334E, ISL33337E
Typical Operating Circuits
+3.3V
+
0.1µF
1
C1
0.1µF
+
C2
0.1µF
28
+
27
R1IN
R2IN
T2OUT
T1OUT
B
A
2
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
14
SHDN
VCC
VCC
SLOW485
GND
8, 15
NOTE: PINOUT FOR SSOP
FIGURE 1. PORT RS-232 MODE AND 1 PORT RS-485 MODE
FN8776 Rev 1.00
October 21, 2016
Page 5 of 23
ISL33334E, ISL33337E
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 JESD78D, 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) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3.3V
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 = 3.15V to 3.45V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at VCC = 3.3V,
TA = +25°C (Note 10). Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNIT
Full
-
-
VCC
V
Full
2
2.3
-
V
DC CHARACTERISTICS - RS-485 DRIVER (PORT 2)
Driver Differential VOUT (no load)
VOD1
Driver Differential VOUT (with load)
VOD2
R = 50Ω (RS-422) (Figure 2)
R = 27Ω (RS-485) (Figure 2)
Full
1.5
2
5
V
VOD3
RD = 60Ω, R = 375Ω, VCM = -7V to 12V (Figure 2)
Full
1.5
-
5
V
VOD
R = 27Ω or 50Ω (Figure 2)
Full
-
0.01
0.2
V
Driver Common-Mode VOUT
VOC
R = 27Ω or 50Ω (Figure 2)
Full
-
-
3
V
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
VOC
R = 27Ω or 50Ω (Figure 2)
Full
-
0.01
0.2
V
Full
35
-
250
mA
VOUT = 12V
Full
-
-
200
µA
VOUT = -7V
Full
-200
-
-
µA
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
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 3.6V
DC CHARACTERISTICS - RS-232 DRIVER (PORT 1)
Driver Output Voltage Swing
VO
All TOUTS loaded with 3kΩ to ground
Full
±5
-
-
V
Driver Output Short-Circuit Current
IOS
VOUT = 0V
Full
-60
-
60
mA
DC CHARACTERISTICS - LOGIC PINS (i.e., DRIVER AND CONTROL INPUT PINS)
Input High Voltage
VIH
Full
2.2
-
-
V
Input Low Voltage
VIL
Full
-
-
0.8
V
Input Current
IIN1
Pins Without Pull ups or Pull downs
Full
-2
-
2
µA
IIN2
SLOW485, DE485, RE485, SHDN
Full
-25
-
25
µA
FN8776 Rev 1.00
October 21, 2016
Page 6 of 23
ISL33334E, ISL33337E
Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at VCC = 3.3V,
TA = +25°C (Note 10). (Continued)Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNIT
-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
VIN
Full
-25
-
25
V
SYMBOL
TEST CONDITIONS
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 3.0 to 3.6V
-7V ≤ VCM ≤ 12V, VCC = 0 (Note 13) or
3V ≤ VCC ≤ 3.6V
DC CHARACTERISTICS - RS-232 RECEIVER INPUTS (PORT 1)
Receiver Input Voltage Range
Receiver Input Threshold
VIL
Full
-
1.1
0.8
V
VIH
Full
2.4
1.6
-
V
Receiver Input Hysteresis
V TH
25
-
0.5
-
V
Receiver Input Resistance
RIN
Full
3
5
7
kΩ
VCC-0.4
-
-
V
VIN = ±15V, VCC powered up (Note 13)
DC CHARACTERISTICS - RECEIVER OUTPUTS (PORT 1 and 2)
Receiver Output High Voltage
VOH
IO = -1.5mA
Full
Receiver Output Low Voltage
VOL
IO = 5mA
Full
-
0.2
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
-
40
160
µA
Bus Pins (A, B, Y, Z, RxIN, TxOUT) Any
Port
Human body model
25
-
±15
-
kV
All Other Pins
Human body model
25
-
±2.5
-
kV
Machine model
25
-
±200
-
V
POWER SUPPLY CHARACTERISTICS
No-Load Supply Current, (Note 11)
Shutdown Supply Current
ISHDN
ESD CHARACTERISTICS
RS-232 DRIVER AND RECEIVER SWITCHING CHARACTERISTICS (PORT 1, ALL VERSIONS AND SPEEDS)
Driver Output Transition Region
Slew Rate
Driver Output Transition Time
Driver Propagation Delay
SR
tr, tf
tDPHL
RL = 3kΩ, Measured From
3V to -3V or -3V to 3V
CL ≥15pF
Full
-
20
30
V/µs
CL 2500pF
Full
4
9
-
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
tDPLH
Driver Propagation Delay Skew
tDSKEW
tDPHL - tDPLH (Figure 7)
Full
-
300
450
ns
Driver Enable Time from Shutdown
tDENSD
VOUT = ±3.0V, CL = 1000pF
25
-
25
-
µs
Driver Maximum Data Rate
DRD
RL = 3kΩ, CL = 500pF, One Transmitter
Switching
Full
250
400
-
kbps
Receiver Propagation Delay
tRPHL
CL = 15pF (Figure 8)
Full
-
40
120
ns
Full
-
58
120
ns
tRPLH
FN8776 Rev 1.00
October 21, 2016
Page 7 of 23
ISL33334E, ISL33337E
Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at VCC = 3.3V,
TA = +25°C (Note 10). (Continued)Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
Receiver Propagation Delay Skew
Receiver Maximum Data Rate
SYMBOL
tRSKEW
DRR
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNIT
tRPHL - tRPLH (Figure 8)
Full
-
18
40
ns
CL = 15pF
Full
0.46
2
-
Mbps
Full
10
20
35
ns
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
-
2
10
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF, (Figure 3)
Full
3
20
30
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 4)
Full
-
28
60
ns
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 4)
Full
-
35
60
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 4)
Full
-
30
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND Figure 4)
Full
-
30
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 4)
Full
-
100
250
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 500Ω, CL = 100pF, SW = GND (Figure 4)
Full
-
290
375
ns
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
20
35
-
Mbps
800
1600
2500
ns
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
Driver Output Skew
tSKEW
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
-
250
500
ns
Driver Differential Rise or Fall Time
tR, tF
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
1000
1700
3100
ns
Full
-
45
100
ns
Driver Enable to Output Low
tZL
CL = 100pF, SW = VCC (Figure 4)
Driver Enable to Output High
tZH
CL = 100pF, SW = GND (Figure 4)
Full
-
900
1200
ns
Driver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 4)
Full
-
35
60
ns
Driver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 4)
Full
-
25
60
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 500Ω, CL = 100pF, SW = VCC (Figure 4)
Full
-
-
800
ns
Driver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 500Ω, CL = 100pF, SW = GND (Figure 4)
Full
-
-
1500
ns
RDIFF = 54Ω, CL = 100pF (Figure 3)
Full
115
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
45
70
ns
Receiver Skew | tPLH - tPHL |
tSKEW
(Figure 5)
Full
-
3
10
ns
Receiver Maximum Data Rate
fMAX
Full
20
40
-
Mbps
Receiver Enable to Output Low
tZL
CL = 15pF, SW = VCC (Figure 6)
Full
-
20
60
ns
Receiver Enable to Output High
tZH
CL = 15pF, SW = GND (Figure 6)
Full
-
20
60
ns
Receiver Disable from Output Low
tLZ
CL = 15pF, SW = VCC (Figure 6)
Full
-
20
60
ns
Receiver Disable from Output High
tHZ
CL = 15pF, SW = GND (Figure 6)
Full
-
20
60
ns
Receiver Enable from Shutdown to
Output Low
tZLSHDN
CL = 15pF, SW = VCC (Figure 6)
Full
-
500
900
ns
Receiver Enable from Shutdown to
Output High
tZHSHDN
CL = 15pF, SW = GND (Figure 6)
Full
-
500
900
ns
FN8776 Rev 1.00
October 21, 2016
Page 8 of 23
ISL33334E, ISL33337E
Electrical Specifications Test Conditions: VCC = 3.15V to 3.45V, C1 - C4 = 0.1µF; unless otherwise specified. Typicals are at VCC = 3.3V,
TA = +25°C (Note 10). (Continued)Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEMP
(°C)
TEST CONDITIONS
MIN
(Note 14)
MAX
(Note 14)
TYP
UNIT
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. 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
VCC
DE485
tPLH
tPHL
CL = 100pF
VOH
OUT (Z)
50%
50%
Z
DI
VOL
RDIFF
D
Y
tDLH
CL = 100pF
90%
DIFF OUT (Y - Z)
SIGNAL
GENERATOR
10%
tDHL
0V
0V
+VOD
90%
10%
tR
-VOD
tF
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
FN8776 Rev 1.00
October 21, 2016
Page 9 of 23
ISL33334E, ISL33337E
Test Circuits and Waveforms (Continued)
DE485
Z
DI
500?
VCC
D
SIGNAL
GENERATOR
Y
GND
SW
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
FN8776 Rev 1.00
October 21, 2016
Page 10 of 23
ISL33334E, ISL33337E
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
FN8776 Rev 1.00
October 21, 2016
Page 11 of 23
ISL33334E, ISL33337E
Typical Performance Curves
VCC = 3.3V, TA = +25°C, unless otherwise specified
90
VOL, +25 °C
DRIVER OUTPUT CURRENT (mA)
RECEIVER OUTPUT CURRENT (mA)
30
VOH, +25 °C
25
VOL, +85 °C
20
VOH, +85 °C
15
10
5.0
0
0
1
2
RECEIVER OUTPUT VOLTAGE (V)
3
70
60
50
40
30
20
10
0
3.3
0
0.5
1
1.5
2
2.5
3
3.5
DIFFERENTIAL OUTPUT VOLTAGE (V)
FIGURE 10. RS-485, DRIVER OUTPUT CURRENT vs DIFFERENTIAL
OUTPUT VOLTAGE
FIGURE 9. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT
VOLTAGE
2.30
250
2.25
RDIFF = 100Ω
2.20
2.15
2.10
2.05
RDIFF = 54Ω
2.00
150
50
Y OR Z = LOW
0
Y OR Z = HIGH
-50
-100
1.90
-40
-150
0
25
50
TEMPERATURE (°C)
75
85
FIGURE 11. RS-485, DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
-40 °C
100
1.95
-25
+25 °C
+85 °C
200
OUTPUT CURRENT (mA)
DIFFERENTIAL OUTPUT VOLTAGE (V)
80
+25 °C
+85 °C
-40 °C
-7 -6
-4
-2
0
2
4
6
OUTPUT VOLTAGE (V)
8
10
FIGURE 12. RS-485, DRIVER OUTPUT CURRENT vs
SHORT-CIRCUIT VOLTAGE
4.5
4.0
DE485 = VCC
ICC (mA)
3.5
DE485 = GND
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
FN8776 Rev 1.00
October 21, 2016
Page 12 of 23
12
ISL33334E, ISL33337E
Typical Performance Curves
1640
VCC = 3.3V, TA = +25°C, unless otherwise specified (Continued)
300
RDIFF = 54Ω, CL = 100pF
RDIFF = 54Ω, CL = 100pF
|tPLHZ - tPHLY|
1630
250
|tPHLZ - tPLHY|
200
1610
1590
SKEW (ns)
tDHL
1600
tDLH
100
1580
1570
150
tDHL
50
1560
|tDLH - tDHL|
1550
-40
-25
25
0
75
50
0
-40
85
-25
TEMPERATURE (°C)
25
3.0
2.0
tDLH
SKEW (ns)
PROPAGATION DELAY (ns)
|tDLH - tDHL|
2.5
22
20
19
tDHL
18
1.5
|tPHLZ - tPLHY|
1.0
17
0.5
|tPLHZ - tPHLY|
16
-40
-25
0
25
50
75
0
-40
85
-25
TEMPERATURE (°C)
0
5
RO
0
4
Z
2
1
Y
0
TIME (400ns/DIV)
FIGURE 18. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (SLOW DATA RATE)
FN8776 Rev 1.00
October 21, 2016
RECEIVER OUTPUT (V)
DI
5
DRIVER INPUT (V)
RDIFF = 54Ω, CL = 100pF
0
50
25
TEMPERATURE (°C)
85
75
FIGURE 17. RS-485, DRIVER SKEW vs TEMPERATURE
(FAST DATA RATE)
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
RECEIVER OUTPUT (V)
FIGURE 16. RS-485, DRIVER PROPAGATION DELAY vs
TEMPERATURE (FAST DATA RATE)
3
85
RDIFF = 54Ω, CL = 100pF
23
15
75
FIGURE 15. RS-485, DRIVER SKEW vs TEMPERATURE
(SLOW DATA RATE)
RDIFF = 54Ω, CL = 100pF
21
50
TEMPERATURE (°C)
FIGURE 14. RS-485, DRIVER PROPAGATION DELAY vs
TEMPERATURE (SLOW DATA RATE)
24
0
RDIFF = 54Ω, CL = 100pF
DI
5
0
5
RO
0
4
3
Y
2
1
Z
0
TIME (400ns/DIV)
FIGURE 19. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (SLOW DATA RATE)
Page 13 of 23
DRIVER INPUT (V)
PROPAGATION DELAY (ns)
1620
ISL33334E, ISL33337E
DI
0
5
RO
0
4
Z
3
2
Y
1
RDIFF = 54Ω, CL = 100pF
DI
0
0
5
RO
0
4
3
Y
2
1
Z
0
TIME (10ns/DIV)
TIME (10ns/DIV)
FIGURE 20. RS-485, DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH (FAST DATA RATE)
FIGURE 21. RS-485, DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW (FAST DATA RATE)
5.0
2.5
VOUT+
250kbps
BOTH TOUTS LOADED WITH 3kΩ TO GND
2 TRANSMITTERS AT 250kbps OR 400kbps
400kbps
0
-2.5
400kbps
-5
250kbps
VOUT 0
1000
2000
3000
4000
TRANSMITTER OUTPUT VOLTAGE (V)
7.5
RS-232 REGION OF NONCOMPLIANCE
TRANSMITTER OUTPUT VOLTAGE (V)
7.5
-7.5
5
DRIVER INPUT (V)
5
RECEIVER OUTPUT (V)
RDIFF = 54Ω, CL = 100pF
DRIVER INPUT (V)
VCC = 3.3V, TA = +25°C, unless otherwise specified (Continued)
DRIVER OUTPUT (V)
DRIVER OUTPUT (V)
RECEIVER OUTPUT (V)
Typical Performance Curves
5.0
2.5
0
VOUT+
OUTPUTS STATIC
BOTH TOUTS LOADED WITH 3kΩ TO GND
AND AT V+ OR V-
-2.5
-5
VOUT -7.5
-40
5000
-25
LOAD CAPACITANCE (pF)
FIGURE 22. RS-232, TRANSMITTER OUTPUT VOLTAGE vs LOAD
CAPACITANCE
0
25
TEMPERATURE (°C)
50
75
85
FIGURE 23. RS-232, TRANSMITTER OUTPUT VOLTAGE vs
TEMPERATURE
TRANSMITTER OUTPUT CURRENT (mA)
50
40
5V
TxOUT = LOW
30
0
20
CL = 2000pF, 2 CHANNELS SWITCHING
TxIN
5V
VOUT SHORTED TO GND
10
0
0
-5V
5V
-10
RxOUT
TxOUT = HIGH
0
-20
-30
-40
TxOUT/
RxIN
-25
0
25
50
75
85
2µs/DIV
TEMPERATURE (°C)
FIGURE 24. RS-232, TRANSMITTER SHORT-CIRCUIT CURRENT vs
TEMPERATURE
FN8776 Rev 1.00
October 21, 2016
FIGURE 25. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS
AT 250kbps
Page 14 of 23
ISL33334E, ISL33337E
Typical Performance Curves
VCC = 3.3V, TA = +25°C, unless otherwise specified (Continued)
58
CL = 1000pF, 2 CHANNELS SWITCHING
TxIN
TxOUT/
RxIN
5V
0
-5V
5V
0
56
55
53
52
51
49
2µs/DIV
DATA RATE (kbps)
450
2 TRANSMITTERS AT +25°C
1 TRANSMITTER AT +25°C
350
300
1 TRANSMITTER AT +85°C
200
2 TRANSMITTERS AT +85°C
150
1000
500
1000
1500
2000
2000
3000
4000
LOAD CAPACITANCE (pF)
5000
FIGURE 28. RS-232, TRANSMITTER MAXIMUM DATA RATE vs
LOAD CAPACITANCE
7.5
TRANSMITTER OUTPUT VOLTAGE (V)
VOUT ≥ ±4V AND DUTY CYCLE BETWEEN 40% AND 60%
500
BOTH TOUTS LOADED WITH 5kΩ TO GND
400
0
FIGURE 27. RS-232, RECEIVER OUTPUT +DUTY CYCLE vs DATA
RATE
550
0
SR IN = 100V/µs
DATA RATE (kbps)
FIGURE 26. RS-232, TRANSMITTER AND RECEIVER WAVEFORMS
AT 400kbps
100
SR IN = 15V/µs
54
50
RxOUT
250
FULL TEMP RANGE
+25°C
VOUT+
5
+85°C
2.5
2 TRANSMITTERS SWITCHING
0
BOTH TOUTS LOADED WITH 5kΩ TO GND, CL = 1000pF
-2.5
+85°C
-5
+25°C
VOUT -7.5
0
100
200
300
400
DATA RATE (kbps)
500
600
FIGURE 29. RS-232, TRANSMITTER OUTPUT VOLTAGE vs DATA
RATE
Die Characteristics
650
2 TRANSMITTERS SWITCHING
600 BOTH T
OUTS LOADED WITH 3kΩ TO GND, CL = 1000pF
SKEW (ns)
550
+85°C
500
SUBSTRATE AND QFN PAD POTENTIAL
(POWERED UP):
GND
PROCESS:
BiCMOS
450
400
+25°C
350
-40 °C
300
250
0
50
200
400
600 650
DATA RATE (kbps)
FIGURE 30. RS-232, TRANSMITTER SKEW vs DATA RATE
FN8776 Rev 1.00
October 21, 2016
Page 15 of 23
RS-232 REGION OF NONCOMPLIANCE
0
VIN = ±5V
57
RECEIVER + DUTY CYCLE (%)
5V
ISL33334E, ISL33337E
Typical Application
Detailed Description
RS-232 to RS-485 Converter
Each of the ISL3333XE parts supports dual protocols:
RS-485/RS-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/RS-422
maximum distance of 4000’ (1220m).
The ISL33334E, ISL33337E 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-485 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.
+3.3V
+ 0.1µF
C1
0.1µF
C2
0.1µF
NC
TxD
RS-232 IN
1
C1+
2
C128
C2+
+
27
C2+
4 R1IN
9, 26
VCC
V+
3
V- 17
R
R1OUT 24
+ C3
0.1µF
C4
0.1µF
+
NC
5k?
5 R2IN
R
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 /RS-422 mode and
includes one Rx and one Tx.
R2OUT 25
5k?
NC
RxD
RS-232 OUT
RS-485 IN
RS-485 OUT
6 T1OUT
7 T2OUT
13
B
12
A
11
Z
10
Y
T1IN 22
D
T2IN 23
D
RO
R
RS-422 is typically a point-to-point (one driver talking to one
receiver on a bus), or a point-to-multireceiver (multidrop)
standard that allows only one driver and up to 10 receivers on
each bus. Because of the one driver per bus limitation, RS-422
networks use a two bus, full duplex structure for bidirectional
communication and the Rx inputs and Tx outputs (no tri-state
required) connect to different busses, as shown in Figure 33.
RS-232 is a point-to-point, single ended (signal voltages
referenced to GND) communication protocol targeting fairly
short (
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