DATASHEET
ISL31470E, ISL31472E, ISL31475E, ISL31478E
FN7639
Rev.2.00
Feb 14, 2019
Fault Protected, Extended Common-Mode Range, RS-485/RS-422 Transceivers
The ISL31470E, ISL31472E, ISL31475E, and ISL31478E are
fault protected, extended common-mode range differential
transceivers that exceed the RS-485 and RS-422 standards for
balanced communication. The RS-485 bus pins (driver outputs
and receiver inputs) are protected against overvoltages up to
±60V. Additionally, these transceivers operate in environments
with common-mode voltages up to ±15V (exceeds the RS-485
requirement), making this RS-485 family one of the more
robust on the market.
Features
Transmitters deliver an exceptional 2.5V (typical) differential
output voltage into the RS-485 specified 54Ω load. This yields
better noise immunity than standard RS-485 ICs, or allows up
to six 120Ω terminations in star topologies.
• High Rx IOL for opto-couplers in isolated designs
The receiver (Rx) inputs feature a Full Fail-Safe design that
ensures a logic high Rx output if the Rx inputs are floating,
shorted, or on a terminated but undriven (idle) bus. The Rx
outputs feature high drive levels - typically 15mA at VOL = 1V (to
ease the design of opto-coupled isolated interfaces).
Half duplex (Rx inputs and Tx outputs multiplexed together)
and full duplex pinouts are available. See Table 1 on page 3 for
key features and configurations by device number.
• Fault protected RS-485 bus pins . . . . . . . . . . . . . . up to ±60V
• Extended common-mode range. . . . . . . . . . . . . . . . . . . . ±15V
larger than required for RS-485
• 1/4 unit load for up to 128 devices on the bus
• High transient overvoltage tolerance. . . . . . . . . . . . . . . . ±80V
• Full fail-safe (open, short, terminated) RS-485 receivers
• Hot plug circuitry - Tx and Rx outputs remain three-state
during power-up/power-down
• Choice of RS-485 data rates . . . . . . . . . . . . .250kbps to 15Mbps
• Low quiescent supply current. . . . . . . . . . . . . . . . . . . . 2.3mA
• Ultra low shutdown supply current. . . . . . . . . . . . . . . . . . 10µA
• Pb-free (RoHS compliant)
Applications
• Utility meters/automated meter reading systems
• High node count systems
For an RS-485 family with a ±25V extended common-mode
range, see the ISL31490E datasheet.
• PROFIBUS™ and field bus networks, and factory automation
Related Literature
• Building lighting and environmental control systems
For a full list of related documents, visit our website:
• Security camera networks
• Industrial/process control networks
• ISL31470E, ISL31472E, ISL31475E, and ISL31478E device
pages
20
15
VID = ±1V
B
12
A
COMMON-MODE RANGE
VOLTAGE (V)
15
10
5
RO
0
0
-7
-15
-5
TIME (20ns/DIV)
FIGURE 1. EXCEPTIONAL Rx OPERATES AT >15Mbps EVEN WITH
±15V COMMON MODE VOLTAGE
FN7639 Rev.2.00
Feb 14, 2019
STANDARD RS-485
TRANSCEIVER
ISL3147xE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON-MODE
RANGE vs STANDARD RS-485 DEVICEs
Page 1 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Typical Operating Circuits
+5V
+5V
+
8
VCC
1 RO
0.1µF
8
VCC
R
DI 4
D
2 RE
B/Z
7
3 DE
A/Y
6
4 DI
0.1µF
+
RT
RT
7
B/Z
DE 3
6
A/Y
RE 2
RO 1
R
D
GND
GND
5
5
FIGURE 3. ISL31472E, ISL31475E, ISL31478E
+5V
+5V
+
13, 14
VCC
2 RO
R
A 12
0.1µF
0.1µF
+
13, 14
9 Y VCC
RT
10 Z
B 11
D
DI 5
3 RE
DE 4
4 DE
RE 3
5 DI
RT
Z 10
Y 9
D
11 B
R
12 A
GND
RO 2
GND
6, 7
6, 7
FIGURE 4. ISL31470E
FN7639 Rev.2.00
Feb 14, 2019
Page 2 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Ordering Information
PART NUMBER
(Notes 3, 4)
PART
MARKING
TEMP. RANGE
(°C)
TAPE AND REEL
(Units) (Note 1)
PACKAGE
(RoHS Compliant)
PKG.
DWG. #
ISL31470EIBZ
ISL31470 EIBZ
-40 to +85
-
14 Ld SOIC
M14.15
ISL31470EIBZ-T
ISL31470 EIBZ
-40 to +85
2.5k
14 Ld SOIC
M14.15
ISL31470EIBZ-T7A
ISL31470 EIBZ
-40 to +85
250
14 Ld SOIC
M14.15
ISL31472EIBZ
31472 EIBZ
-40 to +85
-
8 Ld SOIC
M8.15
ISL31472EIBZ-T
31472 EIBZ
-40 to +85
2.5k
8 Ld SOIC
M8.15
ISL31472EIBZ-T7A
31472 EIBZ
-40 to +85
250
8 Ld SOIC
M8.15
ISL31472EIPZ (Note 2) (No longer available,
recommended replacement:ISL32472EIBZ)
31472 EIPZ
-40 to +85
-
8 Ld PDIP
E8.3
ISL31475EIBZ
31475 EIBZ
-40 to +85
-
8 Ld SOIC
M8.15
ISL31475EIBZ-T
31475 EIBZ
-40 to +85
2.5k
8 Ld SOIC
M8.15
ISL31475EIBZ-T7A
31475 EIBZ
-40 to +85
250
8 Ld SOIC
M8.15
ISL31478EIBZ
31478 EIBZ
-40 to +85
-
8 Ld SOIC
M8.15
ISL31478EIBZ-T
31478 EIBZ
-40 to +85
2.5k
8 Ld SOIC
M8.15
ISL31478EIBZ-T7A
31478 EIBZ
-40 to +85
250
8 Ld SOIC
M8.15
NOTES:
1. See TB347 for details about reel specifications.
2. Pb-free PDIPs can be used for through-hole wave solder processing only. They are not intended for use in Reflow solder processing applications.
3. These 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). 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.
4. For Moisture Sensitivity Level (MSL), see the ISL31470E, ISL31472E, ISL31475E, and ISL31478E device pages. For more information about MSL, see
TB363.
TABLE 1. SUMMARY OF FEATURES
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED?
EN PINS?
HOT
PLUG?
QUIESCENT ICC
(mA)
LOW POWER
SHUTDOWN?
PIN COUNT
ISL31470E
Full
0.25
Yes
Yes
Yes
2.3
Yes
14
ISL31472E
Half
0.25
Yes
Yes
Yes
2.3
Yes
8
ISL31475E
Half
1
Yes
Yes
Yes
2.3
Yes
8
ISL31478E
Half
15
No
Yes
Yes
2.3
Yes
8
PART NUMBER
FN7639 Rev.2.00
Feb 14, 2019
Page 3 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Pin Configurations
ISL31470E
(14 LD SOIC)
TOP VIEW
ISL31472E, ISL31475E, ISL31478E
(8 LD SOIC, 8 LD PDIP)
TOP VIEW
RO
1
RE
2
DE
3
DI
4
R
D
14 VCC
8
VCC
NC 1
7
B/Z
RO 2
6
A/Y
RE 3
12 A
GND
DE 4
11 B
5
13 VCC
R
D
DI 5
10 Z
GND 6
9 Y
GND 7
8 NC
Pin Descriptions
PIN
NAME
8 LD
PIN #
14 LD
PIN #
RO
1
2
Receiver output: If A-B -10mV, RO is high; If A-B -200mV, RO is low; RO = High if A and B are unconnected (floating), shorted
together, or connected to an undriven, terminated bus.
RE
2
3
Receiver output enable. RO is enabled when RE is low; RO is high impedance when RE is high. Internally pulled low.
DE
3
4
Driver output enable. The driver outputs, Y and Z, are enabled by bringing DE high. They are high impedance when DE is
low. Internally pulled high.
FUNCTION
DI
4
5
GND
5
6, 7
Driver input. A low on DI forces output Y low and output Z high. A high on DI forces output Y high and output Z low.
A/Y
6
-
±60V fault protected, RS-485/RS-422 level, non-inverting receiver input and non-inverting driver output. Pin is an input if
DE = 0; pin is an output if DE = 1.
B/Z
7
-
±60V fault protected, RS-485/RS-422 level, inverting receiver input and inverting driver output. Pin is an input if DE = 0;
pin is an output if DE = 1.
A
-
12
±60V fault protected, RS-485/RS-422 level, non-inverting receiver input.
B
-
11
±60V fault protected, RS-485/RS-422 level, inverting receiver input.
Y
-
9
±60V fault protected, RS-485/RS-422 level, non-inverting driver output.
Z
-
10
±60V fault protected, RS-485/RS-422 level, inverting driver output.
VCC
8
NC
-
Ground connection.
13, 14 System power supply input (4.5V to 5.5V).
1, 8
No Internal Connection.
Truth Tables
RECEIVING
TRANSMITTING
INPUTS
INPUTS
OUTPUTS
RE
DE
DI
Z
Y
X
1
1
0
1
X
1
0
1
0
0
0
X
High-Z
High-Z
1
0
X
High-Z*
High-Z*
NOTE: *Low Power Shutdown Mode (see Note 13 on page 9)
OUTPUT
RE
DE
Half Duplex
DE
Full Duplex
A-B
RO
0
0
X
-0.01V
1
0
0
X
-0.2V
0
0
0
X
Inputs
Open/Shorted
1
1
0
0
X
High-Z*
1
1
1
X
High-Z
NOTE: *Low Power Shutdown Mode (see Note 13 on page 9)
FN7639 Rev.2.00
Feb 14, 2019
Page 4 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Absolute Maximum Ratings
Thermal Information
VCC to Ground . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7V
Input Voltages
DI, DE, RE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC + 0.3V)
Input/Output Voltages
A/Y, B/Z, A, B, Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±60V
A/Y, B/Z, A, B, Y, Z
(Transient Pulse Through 100, Note 17). . . . . . . . . . . . . . . . . . . ±80V
RO . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -0.3V to (VCC +0.3V)
Short-Circuit Duration
Y, Z . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Indefinite
ESD Rating . . . . . . . . . . . . . . . . . . . . see “ESD PERFORMANCE” on page 6
Latch-Up (per JESD78, Level 2, Class A) . . . . . . . . . . . . . . . . . . . . . +125°C
Thermal Resistance (Typical)
JA (°C/W) JC (°C/W)
8 Ld PDIP* Package (Notes 5, 7) . . . . . . . . .
105
60
8 Ld SOIC Package (Notes 6, 7) . . . . . . . . . .
116
47
14 Ld SOIC Package (Notes 6, 7) . . . . . . . . .
88
39
Maximum Junction Temperature (Plastic Package). . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . . . -65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see TB493
*Pb-free PDIPs can be used for through-hole wave solder processing only.
They are not intended for use in Reflow solder processing applications.
Recommended Operating Conditions
Supply Voltage (VCC). . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5V
Temperature Range . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . -40°C to +85°C
Bus Pin Common-Mode Voltage Range. . . . . . . . . . . . . . . . . . -15V to +15V
CAUTION: Do not operate at or near the maximum ratings listed for extended periods of time. Exposure to such conditions can adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
5. JA is measured with the component mounted on a low-effective thermal conductivity test board in free air.
6. JA is measured with the component mounted on a high-effective thermal conductivity test board in free air. See TB379 for details.
7. For JC, the “case temp” location is taken at the package top center.
Electrical Specifications Test conditions: VCC = 4.5V to 5.5V; unless otherwise specified. Typicals are at VCC = 5V, TA = +25°C (Note 8).
Boldface limits apply across the operating temperature range, -40°C to +85°C.
PARAMETER
TEM
P
(°C)
MIN
(Note 16)
TYP
Full
-
-
VCC
V
RL = 100Ω (RS-422)
Full
2.4
3.2
-
V
RL = 54Ω (RS-485)
Full
1.5
2.5
VCC
V
RL = 54Ω (PROFIBUS, VCC ≥ 5V)
Full
2.0
2.5
-
RL = 21Ω (Six 120Ω terminations for star
configurations, VCC ≥ 4.75V)
Full
0.8
1.3
-
V
SYMBOL
TEST CONDITIONS
MAX
(Note 16) UNIT
DC CHARACTERISTICS
Driver Differential VOUT (No load)
VOD1
Driver Differential VOUT (Loaded, Figure 5A)
VOD2
Change in Magnitude of Driver Differential
VOUT for Complementary Output States
VOD
RL = 54Ω or 100Ω (Figure 5A)
Full
-
-
0.2
V
Driver Differential VOUT with
Common-Mode Load (Figure 5B)
VOD3
RL = 60Ω, -7V ≤ VCM ≤ 12V
Full
1.5
2.1
VCC
V
RL = 60Ω, -15V ≤ VCM ≤ 15V (VCC ≥ 4.75V)
Full
1.7
2.3
-
v
Driver Common-Mode VOUT (Figure 5A)
VOC
RL = 54Ω or 100Ω
Full
-1
-
3
V
Change in Magnitude of Driver
Common-Mode VOUT for Complementary
Output States
VOC
RL = 54Ω or 100Ω (Figure 5A)
Full
-
-
0.2
V
Driver Short-Circuit Current
IOSD
DE = VCC, -15V ≤ VO ≤ 15V (Note 10)
Full
-250
-
250
mA
IOSD1
At first fold-back, 22V ≤ VO ≤ -22V
Full
-83
-
83
mA
IOSD2
At second fold-back, 35V ≤ VO ≤ -35V
Full
-13
-
13
mA
Logic Input High Voltage
VIH
DE, DI, RE
Full
2.5
-
-
V
Logic Input Low Voltage
VIL
DE, DI, RE
Full
-
-
0.8
V
FN7639 Rev.2.00
Feb 14, 2019
Page 5 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Electrical Specifications Test conditions: VCC = 4.5V to 5.5V; unless otherwise specified. Typicals are at VCC = 5V, TA = +25°C (Note 8).
Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
Logic Input Current
Input/Output Current (A/Y, B/Z)
Input Current (A, B)
(Full Duplex Versions Only)
Output Leakage Current (Y, Z) (Full Duplex
Versions Only)
TEM
P
(°C)
MIN
(Note 16)
TYP
DI
Full
-1
-
1
µA
DE, RE
Full
-15
6
15
µA
VIN = 12V
Full
-
110
250
µA
VIN = -7V
Full
-200
-75
-
µA
VIN = ±15V
Full
-800
±240
800
µA
VIN = ±60V
(Note 18)
Full
-6
±0.5
6
mA
VIN = 12V
Full
-
90
125
µA
SYMBOL
IIN1
IIN2
IIN3
IOZD
TEST CONDITIONS
DE = 0V, VCC = 0V or
5.5V
VCC = 0V or 5.5V
RE = 0V, DE = 0V,
VCC = 0V or 5.5V
MAX
(Note 16) UNIT
VIN = -7V
Full
-100
-70
-
µA
VIN = ±15V
Full
-500
±200
500
µA
VIN = ±60V
(Note 18)
Full
-3
±0.4
3
mA
VIN = 12V
Full
-
20
200
µA
VIN = -7V
Full
-100
-5
-
µA
VIN = ±15V
Full
-500
±40
500
µA
VIN = ±60V
(Note 18)
Full
-3
±0.1
3
mA
Receiver Differential Threshold Voltage
VTH
-15V ≤ VCM ≤ 15V
Full
-200
-100
-10
mV
Receiver Input Hysteresis
VTH
-15V ≤ VCM ≤ 15V
+25
-
25
-
mV
Receiver Output High Voltage
VOH
IO = -2mA, VID = -10mV
Full
VCC - 0.5
4.75
-
V
IO = -8mA, VID = -10mV
Full
2.8
4.2
-
V
Receiver Output Low Voltage
VOL
IO = 6mA, VID = -200mV
Full
-
0.27
0.4
V
Receiver Output Low Current
IOL
VO = 1V, VID = -200mV
Full
15
22
-
mA
Three-State (High Impedance) Receiver
Output Current
IOZR
0V ≤ VO ≤ VCC
Full
-1
0.01
1
µA
Receiver Short-Circuit Current
IOSR
0V ≤ VO ≤ VCC
Full
±12
-
±110
mA
DE = VCC, RE = 0V or VCC,
DI = 0V or VCC
Full
-
2.3
4.5
mA
DE = 0V, RE = VCC, DI = 0V or VCC
Full
-
10
50
µA
Human Body Model
(Tested per JESD22-A114E)
+25
-
±2
-
kV
Machine Model
(Tested per JESD22-A115-A)
+25
-
±700
-
V
Full
-
320
450
ns
SUPPLY CURRENT
No-Load Supply Current (Note 9)
Shutdown Supply Current
ICC
ISHDN
ESD PERFORMANCE
All Pins
DRIVER SWITCHING CHARACTERISTICS (250kbps Versions; ISL31470E and ISL31472E)
Driver Differential Output Delay
tPLH, tPHL RD = 54Ω, CD = 50pF (Figure 6)
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 6)
Full
-
6
30
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 6)
Full
400
650
1200
ns
Maximum Data Rate
fMAX
CD = 820pF (Figure 8)
Full
0.25
1.5
-
Mbps
FN7639 Rev.2.00
Feb 14, 2019
Page 6 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Electrical Specifications Test conditions: VCC = 4.5V to 5.5V; unless otherwise specified. Typicals are at VCC = 5V, TA = +25°C (Note 8).
Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEM
P
(°C)
MIN
(Note 16)
TYP
MAX
(Note 16) UNIT
Driver Enable to Output High
tZH
SW = GND (Figure 7), (Note 11)
Full
-
-
1200
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 7), (Note 11)
Full
-
-
1200
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 7)
Full
-
-
120
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 7)
Full
-
-
120
ns
(Note 13)
Full
60
160
600
ns
Full
-
-
2500
ns
Full
-
-
2500
ns
Full
-
70
125
ns
ns
Time to Shutdown
Driver Enable from Shutdown to Output
High
tSHDN
tZH(SHDN) SW = GND (Figure 7), (Notes 13, 14)
Driver Enable from Shutdown to Output Low tZL(SHDN) SW = VCC (Figure 7), (Notes 13, 14)
DRIVER SWITCHING CHARACTERISTICS (1Mbps Versions; ISL31475E)
Driver Differential Output Delay
tPLH, tPHL RD = 54Ω, CD = 50pF (Figure 6)
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 6)
Full
-
3
15
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 6)
Full
70
230
300
ns
Maximum Data Rate
fMAX
CD = 820pF (Figure 8)
Full
1
4
-
Mbps
Full
-
-
350
ns
Driver Enable to Output High
tZH
SW = GND (Figure 7), (Note 11)
Driver Enable to Output Low
tZL
SW = VCC (Figure 7), (Note 11)
Full
-
-
300
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 7)
Full
-
-
120
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 7)
Full
-
-
120
ns
Time to Shutdown
Driver Enable from Shutdown to Output
High
tSHDN
(Note 13)
tZH(SHDN) SW = GND (Figure 7), (Notes 13, 14)
Driver Enable from Shutdown to Output Low tZL(SHDN) SW = VCC (Figure 7), (Notes 13, 14)
Full
60
160
600
ns
Full
-
-
2000
ns
Full
-
-
2000
ns
Full
-
21
45
ns
DRIVER SWITCHING CHARACTERISTICS (15Mbps Versions; ISL31478E)
Driver Differential Output Delay
tPLH, tPHL RD = 54Ω, CD = 50pF (Figure 6)
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 6)
Full
-
3
6
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 6)
Full
5
17
30
ns
Maximum Data Rate
fMAX
CD = 470pF (Figure 8)
Full
15
25
-
Mbps
Driver Enable to Output High
tZH
SW = GND (Figure 7), (Note 11)
Full
-
-
100
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 7), (Note 11)
Full
-
-
100
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 7)
Full
-
-
120
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 7)
Full
-
-
120
ns
(Note 13)
Full
60
160
600
ns
Full
-
-
2000
ns
Full
-
-
2000
ns
(Figure 9)
Full
0.25
5
-
Mbps
tPLH, tPHL (Figure 9)
Full
-
200
280
ns
Full
-
4
10
ns
Time to Shutdown
Driver Enable from Shutdown to Output
High
tSHDN
tZH(SHDN) SW = GND (Figure 7), (Notes 13, 14)
Driver Enable from Shutdown to Output Low tZL(SHDN) SW = VCC (Figure 7), (Notes 13, 14)
RECEIVER SWITCHING CHARACTERISTICS (250kbps Versions; ISL31470E and ISL31472E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPHL |
FN7639 Rev.2.00
Feb 14, 2019
fMAX
tSKD
(Figure 9)
Page 7 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Electrical Specifications Test conditions: VCC = 4.5V to 5.5V; unless otherwise specified. Typicals are at VCC = 5V, TA = +25°C (Note 8).
Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEM
P
(°C)
MIN
(Note 16)
TYP
MAX
(Note 16) UNIT
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10),
(Note 12)
Full
-
-
50
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 10),
(Note 12)
Full
-
-
50
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10)
Full
-
-
50
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 10)
Full
-
-
50
ns
(Note 13)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Receiver Enable from Shutdown to Output
High
tZH(SHDN) RL = 1kΩ, CL = 15pF, SW = GND (Figure 10),
(Notes 13, 15)
Full
-
-
2000
ns
Receiver Enable from Shutdown to Output
Low
tZL(SHDN) RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10),
(Notes 13, 15)
Full
-
-
2000
ns
(Figure 9)
Full
1
15
-
Mbps
tPLH, tPHL (Figure 9)
Full
-
90
150
ns
(Figure 9)
Full
-
4
10
ns
RECEIVER SWITCHING CHARACTERISTICS (1Mbps Versions; ISL31475E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPH |
fMAX
tSKD
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10),
(Note 12)
Full
-
-
50
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 10),
(Note 12)
Full
-
-
50
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10)
Full
-
-
50
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 10)
Full
-
-
50
ns
(Note 13)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Receiver Enable from Shutdown to Output
High
tZH(SHDN) RL = 1kΩ, CL = 15pF, SW = GND (Figure 10),
(Notes 13, 15)
Full
-
-
2000
ns
Receiver Enable from Shutdown to Output
Low
tZL(SHDN) RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10),
(Notes 13, 15)
Full
-
-
2000
ns
(Figure 9)
Full
15
25
-
Mbps
tPLH, tPHL (Figure 9)
Full
-
35
70
ns
(Figure 9)
Full
-
4
10
ns
RECEIVER SWITCHING CHARACTERISTICS (15Mbps Versions; ISL31478E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPHL |
fMAX
tSKD
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10),
(Note 12)
Full
-
-
50
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 10),
(Note 12)
Full
-
-
50
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10)
Full
-
-
50
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 10)
Full
-
-
50
ns
(Note 13)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Receiver Enable from Shutdown to Output
High
tZH(SHDN) RL = 1kΩ, CL = 15pF, SW = GND (Figure 10),
(Notes 13, 15)
Full
-
-
2000
ns
Receiver Enable from Shutdown to Output
Low
tZL(SHDN) RL = 1kΩ, CL = 15pF, SW = VCC (Figure 10),
(Notes 13, 15)
Full
-
-
2000
ns
FN7639 Rev.2.00
Feb 14, 2019
Page 8 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Electrical Specifications Test conditions: VCC = 4.5V to 5.5V; unless otherwise specified. Typicals are at VCC = 5V, TA = +25°C (Note 8).
Boldface limits apply across the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEM
P
(°C)
TEST CONDITIONS
MIN
(Note 16)
MAX
(Note 16) UNIT
TYP
NOTES:
8. 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.
9. Supply current specification is valid for loaded drivers when DE = 0V.
10. Applies to peak current. See “Typical Performance Curves” beginning on page 11 for more information.
11. Keep RE = 0 to prevent the device from entering shutdown.
12. The RE signal high time must be short enough (typically 600ns to ensure that the device enters shutdown.
15. Set the RE signal high time >600ns to ensure that the device enters shutdown.
16. Parameters with MIN and/or MAX limits are 100% tested at +25°C, unless otherwise specified. Temperature limits established by characterization and
are not production tested.
17. Tested according to TIA/EIA-485-A, Section 4.2.6 (±80V for 15µs at a 1% duty cycle).
18. See “Caution” statement below the “Recommended Operating Conditions” on page 5.
Test Circuits and Waveforms
VCC
RL/2
DE
DI
Z
DI
VOD
D
Z
VCM
VOD
D
Y
Y
RL/2
375Ω
RL/2
DE
VCC
VOC
VOC
375Ω
RL/2
FIGURE 5B. VOD AND VOC WITH COMMON-MODE LOAD
FIGURE 5A. VOD AND VOC
FIGURE 5. DC DRIVER TEST CIRCUITS
3V
DI
1.5V
1.5V
0V
tPLH
VCC
DE
tPHL
OUT (Z)
VOH
OUT (Y)
VOL
Z
DI
CD
D
Y
RD
DIFF OUT (Y - Z)
90%
10%
SIGNAL
GENERATOR
+VOD
90%
10%
tR
-VOD
tF
SKEW = |tPLH - tPHL|
FIGURE 6A. TEST CIRCUIT
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
FN7639 Rev.2.00
Feb 14, 2019
Page 9 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Test Circuits and Waveforms (Continued)
DE
Z
DI
110Ω
VCC
D
SIGNAL
GENERATOR
SW
Y
GND
CL
3V
DE
Note 13
PARAMETER
OUTPUT
RE
DI
SW
CL (pF)
tHZ
Y/Z
X
1/0
GND
50
tLZ
Y/Z
X
0/1
VCC
50
tZH
Y/Z
0 (Note 11)
1/0
GND
100
tZL
Y/Z
0 (Note 11)
0/1
VCC
100
tZH(SHDN)
Y/Z
1 (Note 14)
1/0
GND
100
tZL(SHDN)
Y/Z
1 (Note 14)
0/1
VCC
100
1.5V
1.5V
0V
tZH, tZH(SHDN)
Note 13
tHZ
OUTPUT HIGH
VOH
VOH - 0.5V
2.3V
OUT (Y, Z)
0V
tZL, tZL(SHDN)
tLZ
Note 13
VCC
OUT (Y, Z)
2.3V
VOL + 0.5V
VOL
OUTPUT LOW
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. DRIVER ENABLE AND DISABLE TIMES
VCC
DE
Z
DI
3V
+
54Ω
D
DI
VOD
CD
Y
0V
-
SIGNAL
GENERATOR
+VOD
DIFF OUT (Y - Z)
-VOD
FIGURE 8A. TEST CIRCUIT
0V
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. DRIVER DATA RATE
RE
B
A
SIGNAL
GENERATOR
R
RO
15pF
B
750mV
0V
0V
-750mV
A
tPLH
SIGNAL
GENERATOR
tPHL
VCC
50%
RO
50%
0V
FIGURE 9A. TEST CIRCUIT
FIGURE 9B. MEASUREMENT POINTS
FIGURE 9. RECEIVER PROPAGATION DELAY AND DATA RATE
FN7639 Rev.2.00
Feb 14, 2019
Page 10 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Test Circuits and Waveforms (Continued)
RE
B
A
R
1kΩ
RO
SIGNAL
GENERATOR
15pF
VCC
GND
SW
Note 13
RE
3V
1.5V
1.5V
0V
PARAMETER
DE
0
tHZ
A
SW
+1.5V
tZH, tZH(SHDN)
GND
tLZ
0
-1.5V
VCC
tZH (Note 12)
0
+1.5V
GND
tZL (Note 12)
0
-1.5V
VCC
tZH(SHDN) (Note 15)
0
+1.5V
GND
tZL(SHDN) (Note 15)
0
-1.5V
VCC
tHZ
OUTPUT HIGH
Note 13
VOH
VOH - 0.5V
1.5V
RO
0V
tZL, tZL(SHDN)
tLZ
Note 13
VCC
RO
1.5V
VOL + 0.5V
VOL
OUTPUT LOW
FIGURE 10A. TEST CIRCUIT
FIGURE 10B. MEASUREMENT POINTS
FIGURE 10. RECEIVER ENABLE AND DISABLE TIMES
Typical Performance Curves
RD = 20Ω
80
RD = 30Ω
+25°C
70
RD = 54Ω
+85°C
60
50
40
RD = 100Ω
30
20
10
0
0
1
2
3
4
DIFFERENTIAL OUTPUT VOLTAGE (V)
5
FIGURE 11. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT
VOLTAGE
FN7639 Rev.2.00
Feb 14, 2019
DIFFERENTIAL OUTPUT VOLTAGE (V)
3.6
90
DRIVER OUTPUT CURRENT (mA)
VCC = 5V, TA = +25°C; unless otherwise specified.
3.4
RD = 100Ω
3.2
3
2.8
2.6
RD = 54Ω
2.4
2.2
-40
-25
0
25
50
TEMPERATURE (°C)
75
85
FIGURE 12. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
Page 11 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Typical Performance Curves
VCC = 5V, TA = +25°C; unless otherwise specified. (Continued)
70
2.45
60
2.40
RECEIVER OUTPUT CURRENT (mA)
DE = VCC, RE = X
2.35
ICC (mA)
2.30
2.25
DE = GND, RE = GND
2.20
2.15
2.10
2.05
2.00
-40
-25
0
25
50
TEMPERATURE (°C)
75
20
10
0
-10
340
600
335
400
200
0
Y OR Z
-200
-70
-50
-30
-10 0 10
30
BUS PIN VOLTAGE (V)
50
1
2
3
4
RECEIVER OUTPUT VOLTAGE (V)
5
RD = 54Ω, CD = 50pF
tPLH
325
320
315
tPHL
310
-40
-25
25
0
TEMPERATURE (°C)
50
75
85
FIGURE 16. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL31470E, ISL31472E)
85
RD = 54Ω, CD = 50pF
RD = 54Ω, CD = 50pF
7
PROPAGATION DELAY (ns)
80
6
5
4
3
2
75
70
tPLH
65
tPHL
60
55
1
0
0
330
300
70
FIGURE 15. BUS PIN CURRENT vs BUS PIN VOLTAGE
8
VOH, +25°C
305
A/Y OR B/Z
-600
VOH, +85°C
-20
800
-400
SKEW (ns)
30
FIGURE 14. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT
VOLTAGE
PROPAGATION DELAY (ns)
BUS PIN CURRENT (µA)
FIGURE 13. SUPPLY CURRENT vs TEMPERATURE
VOL, +85°C
40
-30
85
VOL, +25°C
50
|tPLH - tPHL|
-40
-25
0
50
25
TEMPERATURE (°C)
75
FIGURE 17. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL31470E, ISL31472E)
FN7639 Rev.2.00
Feb 14, 2019
85
50
-40
-25
0
25
TEMPERATURE (°C)
50
75
85
FIGURE 18. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL31475E)
Page 12 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Typical Performance Curves
VCC = 5V, TA = +25°C; unless otherwise specified. (Continued)
27
4.0
RD = 54Ω, CD = 50pF
RD = 54Ω, CD = 50pF
25
PROPAGATION DELAY (ns)
SKEW (ns)
3.5
3.0
2.5
23
tPLH
21
19
tPHL
17
|tPLH - tPHL|
2.0
-40
0
-25
50
25
TEMPERATURE (°C)
75
15
85
FIGURE 19. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL31475E)
-40
0
25
TEMPERATURE (°C)
-25
50
75
FIGURE 20. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL31478E)
3.4
RD = 54Ω, CD = 50pF
3.2
SKEW (ns)
3.0
2.8
2.6
2.4
2.2
|tPLH - tPHL|
2.0
-40
-25
0
50
25
TEMPERATURE (°C)
75
85
FIGURE 21. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE (ISL31478E)
15
10
A
15
B
VID = ±1V
10
0
5
RO
0
-5
-10
-15
VID = ±1V
5
RO
VOLTAGE (V)
VOLTAGE (V)
5
A
B
RO
0
5
RO
0
-5
-10
A
-15
B
TIME (1µs/DIV)
FIGURE 22. ±15V RECEIVER PERFORMANCE (ISL31470E,
ISL31472E)
FN7639 Rev.2.00
Feb 14, 2019
A
B
TIME (400ns/DIV)
FIGURE 23. ±15V RECEIVER PERFORMANCE (ISL31475E)
Page 13 of 21
85
ISL31470E, ISL31472E, ISL31475E, ISL31478E
5
RO
5
RO
0
DRIVER OUTPUT (V)
VOLTAGE (V)
0
-5
-10
A
-15
B
TIME (20ns/DIV)
5
0
5
0
3
2
1
0
-1
-2
-3
RO
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
DRIVER OUTPUT (V)
DI
A/Y - B/Z
TIME (400ns/DIV)
FIGURE 26. DRIVER AND RECEIVER WAVEFORMS (ISL31475E)
Application Information
RS-485 and RS-422 are differential (balanced) data
transmission standards used for long haul or noisy environments.
RS-422 is a subset of RS-485, so RS-485 transceivers are also
RS-422 compliant. RS-422 is a point-to-multipoint (multidrop)
standard that allows only one driver and up to 10 receivers
(assuming one unit load devices) on each bus. RS-485 is a true
multipoint standard that allows up to 32 one unit load devices
(any combination of drivers and receivers) on each bus. To allow
for multipoint operation, the RS-485 specification requires that
drivers must handle bus contention without sustaining any
damage.
Another important advantage of RS-485 is the extended
Common-Mode Range (CMR), which specifies that the driver
outputs and receiver inputs withstand signals that range from
+12V to -7V. RS-422 and RS-485 are intended for runs as long as
4000ft, thus the wide CMR is necessary to handle ground
FN7639 Rev.2.00
Feb 14, 2019
DI
5
0
5
RO
0
3
2
1
0
-1
-2
-3
A/Y - B/Z
TIME (1µs/DIV)
FIGURE 25. DRIVER AND RECEIVER WAVEFORMS (ISL31470E,
ISL31472E)
FIGURE 24. ±15V RECEIVER PERFORMANCE (ISL31478E)
RD = 54Ω, CD = 50pF
RD = 54Ω, CD = 50pF
RD = 54Ω, CD = 50pF
DI
5
0
5
RO
0
3
2
1
0
-1
-2
-3
DRIVER INPUT (V)
10
VID = ±1V
RECEIVER OUTPUT (V)
B
RECEIVER OUTPUT (V)
A
15
DRIVER INPUT (V)
VCC = 5V, TA = +25°C; unless otherwise specified. (Continued)
DRIVER OUTPUT (V)
Typical Performance Curves
A/Y - B/Z
TIME (20ns/DIV)
FIGURE 27. DRIVER AND RECEIVER WAVEFORMS (ISL31478E)
potential differences and voltages induced in the cable by
external fields.
The ISL31470E, ISL31472E, ISL31475E, and ISL31478E are a
family of ruggedized RS-485 transceivers that improves on the
RS-485 basic requirements, and therefore increases system
reliability. The CMR increases to ±15V, while the RS-485 bus pins
(receiver inputs and driver outputs) include fault protection
against voltages and transients up to ±60V. Additionally, larger
than required differential output voltages (VOD) increase noise
immunity.
Receiver (Rx) Features
The devices use a differential input receiver for maximum noise
immunity and common-mode rejection. Input sensitivity is better
than ±200mV, as required by the RS-422 and RS-485
specifications.
Receiver input (load) current surpasses the RS-422 specification
of 3mA, and is four times lower than the RS-485 Unit Load (UL)
Page 14 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
requirement of 1mA maximum. Therefore, these products are
known as one-quarter UL transceivers, and there can be up to
128 of these devices on a network while still complying with the
RS-485 loading specification.
The Rx functions with common-mode voltages as great as ±15V,
making them ideal for industrial, or long networks where induced
voltages are a realistic concern.
All the receivers include a “full fail-safe” function that assures a
high level receiver output if the receiver inputs are unconnected
(floating), shorted together, or connected to a terminated bus
with all the transmitters disabled (such as, an idle bus).
Rx outputs feature high drive levels (typically 22mA at VOL = 1V)
to ease the design of optically-coupled isolated interfaces.
Receivers easily meet the data rates supported by the
corresponding driver, and all receiver outputs are three-statable
using the active low RE input.
The Rx in the 250kbps and 1Mbps versions include noise filtering
circuitry to reject high frequency signals. The 1Mbps version
typically rejects pulses narrower than 50ns (equivalent to
20Mbps), while the 250kbps Rx rejects pulses below 150ns
(6.7Mbps).
Driver (Tx) Features
The RS-485/RS-422 drivers are differential output devices that
deliver at least 1.5V across a 54Ω load (RS-485), and at least
2.4V across a 100Ω load (RS-422). The drivers feature low
propagation delay skew to maximize bit width, and to minimize
EMI. All drivers are three-statable using the active high DE input.
The 250kbps and 1Mbps driver outputs are slew rate limited to
minimize EMI and reflections in unterminated or improperly
terminated networks. Outputs of the ISL31478E driver are not
limited, thus, faster output transition times allow data rates of at
least 15Mbps.
High Overvoltage (Fault) Protection
Increases Ruggedness
The ±60V (referenced to the IC GND) fault protection on the
RS-485 pins, makes these transceivers some of the most rugged
on the market. This level of protection makes the ISL31470E,
ISL31472E, ISL31475E, and ISL31478E perfect for applications
where power (for example, 24V and 48V supplies) must be routed
in the conduit with the data lines, or for outdoor applications where
large transients are likely to occur. When power is routed with the
data lines, even a momentary short between the supply and data
lines destroys an unprotected device. The ±60V fault levels of this
family are at least five times higher than the levels specified for
standard RS-485 ICs. The ISL31470E, ISL31472E, ISL31475E, and
ISL31478E protection is active whether the Tx is enabled or disabled,
and even if the IC is powered down, or VCC and Ground are floating.
Wide Common-Mode Voltage (CMV)
Tolerance Improves Operating Range
RS-485 networks operating in industrial complexes, or over long
distances, are susceptible to large CMV variations. Either of these
operating environments may suffer from large node-to-node
ground potential differences, or CMV pickup from external
electromagnetic sources, and devices with only the minimum
required +12V to -7V CMR may malfunction. The ISL31470E,
ISL31472E, ISL31475E, and ISL31478E’s extended ±15V CMR
allows for operation in environments that would overwhelm
lesser transceivers. Additionally, the Rx does not phase invert
(erroneously change state) even with CMVs of ±40V, or
differential voltages as large as 40V.
High VOD Improves Noise Immunity and
Flexibility
The ISL31470E, ISL31472E, ISL31475E, and ISL31478E drivers
design deliver larger differential output voltages (VOD) than the
RS-485 standard requires, or than most RS-485 transmitters can
deliver. The typical ±2.5V VOD provides more noise immunity
than networks built using many other transceivers.
Another advantage of the large VOD is the ability to drive more
than two bus terminations, which allows for using the
ISL31470E, ISL31472E, ISL31475E, and ISL31478E in star
topologies and other multi-terminated, nonstandard network
topologies. Figure 11 on page 11, details the transmitter’s VOD
vs IOUT characteristic, and includes load lines for four (30Ω) and
six (20Ω) 120Ω terminations. Figure 11 shows that the driver
typically delivers ±1.3V into six terminations, and the “Electrical
Specification” table ensures a VOD of ±0.8V at 21Ω over the full
temperature range. The RS-485 standard requires a minimum
1.5V VOD into two terminations, but the ISL31470E, ISL31472E,
ISL31475E, and ISL31478E deliver RS-485 voltage levels with 2x
to 3x the number of terminations.
Hot Plug Function
When a piece of equipment powers up, there is a period of time
where the processor or ASIC driving the RS-485 control lines (DE,
RE) is unable to ensure that the RS-485 Tx and Rx outputs are
kept disabled. If the equipment is connected to the bus, a driver
activating prematurely during power-up may crash the bus. To
avoid this scenario, the ISL31470E, ISL31472E, ISL31475E, and
ISL31478E devices incorporate a Hot Plug function. Circuitry
monitoring VCC ensures that, during power-up and power-down, the
Tx and Rx outputs remain disabled, regardless of the state of DE and
RE, if VCC is less than ≈3.5V. This gives the processor/ASIC a chance
to stabilize and drive the RS-485 control lines to the proper states.
Figure 28 illustrates the power-up and power-down performance of
If transients or voltages (including overshoots and ringing)
greater than ±60V are possible, then additional external
protection is required.
FN7639 Rev.2.00
Feb 14, 2019
Page 15 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
the ISL31470E, ISL31472E, ISL31475E, and ISL31478E compared
to an RS-485 IC without the Hot Plug feature.
RE = GND
3.5V
2.8V
2.5
VCC
0
5.0
RL = 1kΩ
2.5
0
A/Y
ISL3147xE
ISL83088E
RL = 1kΩ
RO
ISL3147xE
5.0
2.5
0
RECEIVER OUTPUT (V)
DRIVER Y OUTPUT (V)
5.0
VCC (V)
DE, DI = VCC
TIME (40µs/DIV)
FIGURE 28. HOT PLUG PERFORMANCE (ISL3147xE) vs ISL83088E
WITHOUT HOT PLUG CIRCUITRY
Data Rate, Cables, and Terminations
Built-In Driver Overload Protection
The RS-485 specification requires that drivers survive worst case
bus contentions undamaged. These transceivers meet this
requirement using driver output short-circuit current limits, and
on-chip thermal shutdown circuitry.
The driver output stages incorporate a double fold-back
short-circuit current limiting scheme which ensures that the
output current never exceeds the RS-485 specification, even at
the common-mode and fault condition voltage range extremes.
The first fold-back current level (≈70mA) is set to ensure that the
driver never folds back when driving loads with common-mode
voltages up to ±15V. The very low second fold-back current
setting (≈9mA) minimizes power dissipation if the Tx is enabled
when a fault occurs.
In the event of a major short-circuit condition, the ISL31470E,
ISL31472E, ISL31475E, and ISL31478E’s thermal shutdown
feature disables the drivers whenever the die temperature
becomes excessive. Thermal shutdown eliminates the power
dissipation, allowing the die to cool. The drivers automatically
re-enable after the die temperature drops about 15°C. If the
contention persists, the thermal shutdown/re-enable cycle repeats
until the fault is cleared. The receivers stay operational during
thermal shutdown.
RS-485/RS-422 are intended for network lengths up to 4000ft,
but the maximum system data rate decreases as the
transmission length increases. Devices operating at 15Mbps
may be used at lengths up to 150ft (46m), but the distance can
be increased to 328’ (100m) by operating at 10Mbps. The 1Mbps
versions can operate at full data rates with lengths up to 800ft
(244m). Jitter is the limiting parameter at these faster data rates,
so employing encoded data streams (for example, Manchester
coded or Return-to-Zero) may allow increased transmission
distances. The slow versions can operate at 115kbps, or less, at
the full 4000ft (1220m) distance, or at 250kbps for lengths up to
3000ft (915m). DC cable attenuation is the limiting parameter,
so using better quality cables (for example, 22 AWG) may allow
increased transmission distance.
These CMOS transceivers all use a fraction of the power required
by competitive devices, but they also include a shutdown feature
that reduces the already low quiescent ICC to a 10µA trickle.
These devices enter shutdown whenever the receiver and driver
are simultaneously disabled (RE = VCC and DE = GND) for a
period of at least 600ns. Disabling both the driver and the
receiver for less than 60ns ensures that the transceiver does not
enter shutdown.
Use twisted pair cables for RS-485/RS-422 networks. Twisted pair
cables tend to pick up noise and other electromagnetically induced
voltages as common-mode signals that are effectively rejected by
the differential receivers in these ICs.
Die Characteristics
Note: Proper termination is imperative to minimize reflections
when using the 15Mbps devices. Short networks using the
250kbps versions do not need to be terminated, however,
terminations are recommended unless power dissipation is an
overriding concern.
Low Power Shutdown Mode
Note that receiver and driver enable times increase when the
transceiver enables from shutdown. For more information see
Notes 11 through 15 on page 9.
SUBSTRATE POTENTIAL (POWERED UP):
GND
PROCESS:
Si Gate BiCMOS
In point-to-point, or point-to-multipoint (single driver on bus like
RS-422) networks, terminate the main cable in its characteristic
impedance (typically 120Ω) at the end farthest from the driver. In
multi-receiver applications, keep stubs connecting receivers to
the main cable as short as possible. Multipoint (multi-driver)
systems require that the main cable is terminated in its
characteristic impedance at both ends. Keep stubs connecting a
transceiver to the main cable as short as possible.
FN7639 Rev.2.00
Feb 14, 2019
Page 16 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted.
Please visit our website to make sure you have the latest revision.
DATE
REVISION
Feb 14, 2019
FN7639.2
Updated links throughout document.
Added Related Literature section.
Updated ordering information table by adding tape and reel information and updating notes.
Updated “High Overvoltage (Fault) Protection Increases Ruggedness” on page 15.
Updated M8.15 package outline drawing to the latest revision, changes are as follows:
-Updated to new POD format by removing table and moving dimensions onto drawing and adding land
pattern.
-Changed in Typical Recommended Land Pattern the following:
2.41(0.095) to 2.20(0.087)
0.76 (0.030) to 0.60(0.023)
0.200 to 5.20(0.205)
-Changed Note 1 “1982” to “1994”.
Removed About Intersil section
Updated disclaimer
Sep 3, 2015
FN7639.1
- Updated Ordering Information Table on page 3.
- Added About Intersil Verbiage.
Jun 17, 2010
FN7639.0
Initial Release
FN7639 Rev.2.00
Feb 14, 2019
CHANGE
Page 17 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
Package Outline Drawings
For the most recent package outline drawing, see M14.15.
M14.15
14 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 1, 10/09
8.65
A 3
4
0.10 C A-B 2X
6
14
DETAIL"A"
8
0.22±0.03
D
6.0
3.9
4
0.10 C D 2X
0.20 C 2X
7
PIN NO.1
ID MARK
5
0.31-0.51
B 3
(0.35) x 45°
4° ± 4°
6
0.25 M C A-B D
TOP VIEW
0.10 C
1.75 MAX
H
1.25 MIN
0.25
GAUGE PLANE C
SEATING PLANE
0.10 C
0.10-0.25
1.27
SIDE VIEW
(1.27)
DETAIL "A"
(0.6)
NOTES:
1. Dimensions are in millimeters.
Dimensions in ( ) for Reference Only.
2. Dimensioning and tolerancing conform to AMSEY14.5m-1994.
3. Datums A and B to be determined at Datum H.
(5.40)
4. Dimension does not include interlead flash or protrusions.
Interlead flash or protrusions shall not exceed 0.25mm per side.
5. The pin #1 indentifier may be either a mold or mark feature.
(1.50)
6. Does not include dambar protrusion. Allowable dambar protrusion
shall be 0.10mm total in excess of lead width at maximum condition.
7. Reference to JEDEC MS-012-AB.
TYPICAL RECOMMENDED LAND PATTERN
FN7639 Rev.2.00
Feb 14, 2019
Page 18 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
For the most recent package outline drawing, see E8.3.
E8.3 (JEDEC MS-001-BA ISSUE D)
N
8 LEAD DUAL-IN-LINE PLASTIC PACKAGE
E1
INDEX
AREA
1 2 3
INCHES
N/2
SYMBOL
-B-
-C-
SEATING
PLANE
A2
D1
e
B1
D1
B
0.010 (0.25) M
A1
eC
C A B S
MAX
NOTES
-
0.210
-
5.33
4
0.015
-
0.39
-
4
A2
0.115
0.195
2.93
4.95
-
B
0.014
0.022
0.356
0.558
-
C
L
B1
0.045
0.070
1.15
1.77
8, 10
eA
C
0.008
0.014
0.204
0.355
-
D
0.355
0.400
9.01
D1
0.005
-
0.13
-
5
A
L
MIN
A
E
BASE
PLANE
MAX
A1
-AD
MILLIMETERS
MIN
C
eB
NOTES:
19. Controlling Dimensions: INCH. In case of conflict between
English and Metric dimensions, the inch dimensions control.
10.16
5
E
0.300
0.325
7.62
8.25
6
E1
0.240
0.280
6.10
7.11
5
e
0.100 BSC
2.54 BSC
-
20. Dimensioning and tolerancing per ANSI Y14.5M-1982.
eA
0.300 BSC
7.62 BSC
6
21. Symbols are defined in the “MO Series Symbol List” in Section
2.2 of Publication No. 95.
eB
-
0.430
-
10.92
7
L
0.115
0.150
2.93
3.81
4
22. Dimensions A, A1 and L are measured with the package seated
in JEDEC seating plane gauge GS-3.
23. D, D1, and E1 dimensions do not include mold flash or protrusions. Mold flash or protrusions shall not exceed 0.010 inch
(0.25mm).
24. E and eA are measured with the leads constrained to be perpendicular to datum -C- .
N
8
8
9
Rev. 0 12/93
25. eB and eC are measured at the lead tips with the leads unconstrained. eC must be zero or greater.
26. B1 maximum dimensions do not include dambar protrusions.
Dambar protrusions shall not exceed 0.010 inch (0.25mm).
27. N is the maximum number of terminal positions.
28. Corner leads (1, N, N/2 and N/2 + 1) for E8.3, E16.3, E18.3,
E28.3, E42.6 will have a B1 dimension of 0.030 - 0.045 inch
(0.76 - 1.14mm).
FN7639 Rev.2.00
Feb 14, 2019
Page 19 of 21
ISL31470E, ISL31472E, ISL31475E, ISL31478E
M8.15
For the most recent package outline drawing, see M8.15.
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 4, 1/12
DETAIL "A"
1.27 (0.050)
0.40 (0.016)
INDEX
6.20 (0.244)
5.80 (0.228)
AREA
0.50 (0.20)
x 45°
0.25 (0.01)
4.00 (0.157)
3.80 (0.150)
1
2
8°
0°
3
0.25 (0.010)
0.19 (0.008)
SIDE VIEW “B”
TOP VIEW
2.20 (0.087)
SEATING PLANE
5.00 (0.197)
4.80 (0.189)
1.75 (0.069)
1.35 (0.053)
1
8
2
7
0.60 (0.023)
1.27 (0.050)
3
6
4
5
-C-
1.27 (0.050)
0.25(0.010)
0.10(0.004)
0.51(0.020)
0.33(0.013)
5.20(0.205)
SIDE VIEW “A
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
1. Dimensioning and tolerancing per ANSI Y14.5M-1994.
2. Package length does not include mold flash, protrusions or gate burrs.
Mold flash, protrusion and gate burrs shall not exceed 0.15mm (0.006
inch) per side.
3. Package width does not include interlead flash or protrusions. Interlead
flash and protrusions shall not exceed 0.25mm (0.010 inch) per side.
4. The chamfer on the body is optional. If it is not present, a visual index
feature must be located within the crosshatched area.
5. Terminal numbers are shown for reference only.
6. The lead width as measured 0.36mm (0.014 inch) or greater above the
seating plane, shall not exceed a maximum value of 0.61mm (0.024 inch).
7. Controlling dimension: MILLIMETER. Converted inch dimensions are not
necessarily exact.
8. This outline conforms to JEDEC publication MS-012-AA ISSUE C.
FN7639 Rev.2.00
Feb 14, 2019
Page 20 of 21
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