INTERSIL ISL32478EIBZ

Fault Protected, Extended Common Mode Range,
RS-485/RS-422 Transceivers with ±16.5kV ESD
ISL32470E, ISL32472E, ISL32475E, ISL32478E
The ISL32470E, ISL32472E, ISL32475E, ISL32478E are
Features
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 fault protected against overvoltages up to
±60V and are protected against ±16.5kV ESD strikes without
latch-up. Additionally, these transceivers operate in environments
with common mode voltages up to ±15V (exceeds the RS-485
requirement), making this fault-protected RS-485 family one of
the more robust on the market.
Transmitters (Tx) 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.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating, shorted, or
on a terminated but undriven (idle) bus. Rx outputs feature high
drive levels; typically, 15mA @ 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 2 for key
features and configurations by device number.
For a fault-protected RS-485 transceiver with a ±25V extended
common mode range, please see the ISL32490E and ISL32483E
data sheets.
• 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
• ±16.5kV HBM ESD Protection on RS-485 Bus Pins
• High Transient Over-Voltage Tolerance . . . . . . . . . . . . . . .±80V
• Full Fail-Safe (Open, Short, Terminated) RS-485 Receivers
• High Rx IOL for Opto-Couplers in Isolated Designs
• 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
Applications
• Utility Meters/Automated Meter Reading Systems
• High Node Count RS-485 Systems
• PROFIBUS® and RS-485 Based Field Bus Networks, and
Factory Automation
• Security Camera Networks
• Building Lighting and Environmental Control Systems
• Industrial/Process Control Networks
20
15
VID = ±1V
B
12
COMMON MODE RANGE
15
VOLTAGE (V)
A
10
5
0
RO
0
-7
-15
-5
STANDARD RS-485
TRANSCEIVER
TIME (20ns/DIV)
FIGURE 1. EXCEPTIONAL Rx OPERATES AT >15Mbps EVEN WITH
±15V COMMON MODE VOLTAGE
January 21, 2011
FN7784.0
1
ISL3247xE
FIGURE 2. TRANSCEIVERS DELIVER SUPERIOR COMMON MODE
RANGE vs STANDARD RS-485 DEVICES
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Copyright Intersil Americas Inc. 2011. All Rights Reserved
Intersil (and design) is a trademark owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
ISL32470E, ISL32472E, ISL32475E, ISL32478E
TABLE 1. SUMMARY OF FEATURES
HALF/FULL
DUPLEX
DATA RATE
(Mbps)
SLEW-RATE
LIMITED?
EN PINS?
HOT
PLUG?
QUIESCENT ICC
(mA)
LOW POWER
SHDN?
PIN COUNT
ISL32470E
Full
0.25
Yes
Yes
Yes
2.3
Yes
14
ISL32472E
Half
0.25
Yes
Yes
Yes
2.3
Yes
8
ISL32475E
Half
1
Yes
Yes
Yes
2.3
Yes
8
ISL32478E
Half
15
No
Yes
Yes
2.3
Yes
8
PART NUMBER
Ordering Information
PART NUMBER
(Notes 1, 2, 3)
PART
MARKING
TEMP. RANGE
(°C)
PACKAGE
(Pb-Free)
PKG.
DWG. #
ISL32470EIBZ
ISL32470 EIBZ
-40 to +85
14 Ld SOIC
M14.15
ISL32472EIBZ
32472 EIBZ
-40 to +85
8 Ld SOIC
M8.15
ISL32475EIBZ
32475 EIBZ
-40 to +85
8 Ld SOIC
M8.15
ISL32478EIBZ
32478 EIBZ
-40 to +85
8 Ld SOIC
M8.15
NOTES:
1. Add “-T*” suffix for tape and reel. Please 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), please see device information pages for ISL32470E, ISL32472E, ISL32475E, ISL32478E. For more information on
MSL please see techbrief TB363.
Pin Configurations
ISL32470E
(14 LD SOIC)
TOP VIEW
ISL32472E, ISL32475E, ISL32478E
(8 LD SOIC)
TOP VIEW
RO
1
RE
2
DE
3
DI
4
R
D
8
VCC
NC 1
7
B/Z
RO 2
6
A/Y
RE 3
5
GND
DE 4
DI 5
2
14 VCC
R
13 NC
12 A
11 B
D
10 Z
GND 6
9 Y
GND 7
8 NC
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
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.
DI
4
5
Driver input. A low on DI forces output Y low and output Z high. Similarly, a high on DI forces output Y high and output Z
low.
GND
5
6, 7
A/Y
6
-
±60V Fault and ±16.5kV HBM ESD 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 and ±16.5kV HBM ESD 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 and ±15kV HBM ESD Protected, RS-485/RS-422 level, non-inverting receiver input.
B
-
11
±60V Fault and ±15kV HBM ESD Protected, RS-485/RS-422 level, inverting receiver input.
Y
-
9
±60V Fault and ±15kV HBM ESD Protected, RS-485/RS-422 level, non-inverting driver output.
Z
-
10
±60V Fault and ±15kV HBM ESD Protected, RS-485/RS-422 level, inverting driver output.
VCC
8
14
System power supply input (4.5V to 5.5V).
NC
-
1, 8, 13
FUNCTION
Ground connection.
No Internal Connection.
Truth Tables
RECEIVING
INPUTS
TRANSMITTING
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
(see Note)
High-Z
(see Note)
NOTE: Low Power Shutdown Mode (see Note 11, 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
(see Note)
1
1
1
X
High-Z
NOTE: Low Power Shutdown Mode (see Note 11, page 9).
3
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Typical Operating Circuits
+5V
+5V
+
13, 14
VCC
2 RO
R
0.1µF
0.1µF
+
13, 14
RT
A 12
VCC
9 Y
B 11
10 Z
D
3 RE
DE 4
4 DE
5 DI
DI 5
RE 3
RT
Z 10
11 B
Y 9
D
R
12 A
GND
RO 2
GND
6, 7
6, 7
ISL32470E FULL DUPLEX EXAMPLE
+5V
+5V
+
8
0.1µF
0.1µF
+
8
VCC
1 RO
VCC
R
D
2 RE
B/Z
3 DE
A/Y
4 DI
7
6
RT
RT
DI 4
7
B/Z
DE 3
6
A/Y
RE 2
R
D
GND
GND
5
5
RO 1
ISL32472E, ISL32475E, ISL32478E HALF DUPLEX EXAMPLE
4
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
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 100Ω, Note 15). . . . . . . . . . . . . . . . . . . ±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)
θJA (°C/W) θJC (°C/W)
8 Ld SOIC Package (Notes 4, 5) . . . . . . . . . .
116
47
14 Ld SOIC Package (Notes 4, 5) . . . . . . . . .
88
39
Maximum Junction Temperature (Plastic Package). . . . . . . . . . . . . . . . +150°C
Maximum Storage Temperature Range . . . . . . . . . . . . . .-65°C to +150°C
Pb-free Reflow Profile . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . see link below
http://www.intersil.com/pbfree/Pb-FreeReflow.asp
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 may adversely impact product
reliability and result in failures not covered by warranty.
NOTES:
4. θJA is measured with the component mounted on a high effective thermal conductivity test board in free air. See Tech Brief TB379 for details.
5. For θJC, 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 VCC = 5V, TA = +25°C
(Note 6). Boldface limits apply over the operating temperature range, -40°C to +85°C.
PARAMETER
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNITS
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
DC CHARACTERISTICS
Driver Differential VOUT (No load)
VOD1
Driver Differential VOUT (Loaded,
Figure 3A)
VOD2
Change in Magnitude of Driver
Differential VOUT for
Complementary Output States
ΔVOD
RL = 54Ω or 100Ω (Figure 3A)
Full
-
-
0.2
V
Driver Differential VOUT with
Common Mode Load (Figure 3B)
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
3A)
VOC
RL = 54Ω or 100Ω
Full
-1
-
3
V
Change in Magnitude of Driver
Common-Mode VOUT for
Complementary Output States
ΔVOC
RL = 54Ω or 100Ω (Figure 3A)
Full
-
-
0.2
V
Driver Short-Circuit Current
IOSD
DE = VCC, -15V ≤ VO ≤ 15V (Note 8)
Full
-250
-
250
mA
IOSD1
At First Foldback, 22V ≤ VO ≤ -22V
Full
-83
-
83
mA
IOSD2
At Second Foldback, 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
Logic Input Current
IIN1
DI
Full
-1
-
1
µA
DE, RE
Full
-15
6
15
µA
5
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are VCC = 5V, TA = +25°C
(Note 6). Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
Input/Output Current (A/Y, B/Z)
IIN2
Input Current (A, B)
(Full Duplex Versions Only)
IIN3
Output Leakage Current (Y, Z)
(Full Duplex Versions Only)
IOZD
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNITS
Full
-
110
250
µA
Full
-200
-75
-
µA
VIN = ±15V
Full
-800
±240
800
µA
VIN = ±60V
(Note 16)
Full
-6
±0.5
6
mA
VIN = 12V
Full
-
90
125
µA
VIN = -7V
Full
-100
-70
-
µA
VIN = ±15V
Full
-500
±200
500
µA
VIN = ±60V
(Note 16)
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 16)
Full
-3
±0.1
3
mA
TEST CONDITIONS
DE = 0V, VCC = 0V or VIN = 12V
5.5V
VIN = -7V
VCC = 0V or 5.5V
RE = 0V, DE = 0V,
VCC = 0V or 5.5V
Receiver Differential Threshold
Voltage
V TH
-15V ≤ VCM ≤ 15V
Full
-200
-100
-10
mV
Receiver Input Hysteresis
ΔV TH
-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, 1/2 Duplex
From Bus Pins to
Full Duplex
GND
25
-
±16.5
-
kV
25
-
±15
-
kV
Human Body Model, per JEDEC
25
-
±8
-
kV
Machine Model
25
-
±700
-
V
SUPPLY CURRENT
No-Load Supply Current (Note 7)
ICC
Shutdown Supply Current
ISHDN
ESD PERFORMANCE
RS-485 Pins (A, Y, B, Z, A/Y, B/Z)
All Pins
DRIVER SWITCHING CHARACTERISTICS (250kbps Versions; ISL32470E and ISL32472E)
Driver Differential Output Delay
tPLH, tPHL
RD = 54Ω, CD = 50pF (Figure 4)
Full
-
320
450
ns
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 4)
Full
-
6
30
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 4)
Full
400
650
1200
ns
6
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are VCC = 5V, TA = +25°C
(Note 6). Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNITS
CD = 820pF (Figure 6)
Full
0.25
1.5
-
Mbps
SYMBOL
Maximum Data Rate
fMAX
TEST CONDITIONS
Driver Enable to Output High
tZH
SW = GND (Figure 5), (Note 9)
Full
-
-
1200
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 5), (Note 9)
Full
-
-
1200
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 5)
Full
-
-
120
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 5)
Full
-
-
120
ns
(Note 11)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
SW = GND (Figure 5), (Notes 11, 12)
Full
-
-
2500
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
SW = VCC (Figure 5), (Notes 11, 12)
Full
-
-
2500
ns
DRIVER SWITCHING CHARACTERISTICS (1Mbps Versions; ISL32475E)
Driver Differential Output Delay
tPLH, tPHL
RD = 54Ω, CD = 50pF (Figure 4)
Full
-
70
125
ns
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 4)
Full
-
4.5
15
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 4)
Full
70
170
300
ns
Maximum Data Rate
fMAX
CD = 820pF (Figure 6)
Full
1
4
-
Mbps
Driver Enable to Output High
tZH
SW = GND (Figure 5), (Note 9)
Full
-
-
350
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 5), (Note 9)
Full
-
-
300
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 5)
Full
-
-
120
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 5)
Full
-
-
120
ns
(Note 11)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
SW = GND (Figure 5), (Notes 11, 12)
Full
-
-
2000
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
SW = VCC (Figure 5), (Notes 11, 12)
Full
-
-
2000
ns
DRIVER SWITCHING CHARACTERISTICS (15Mbps Versions; ISL32478E)
Driver Differential Output Delay
tPLH, tPHL
RD = 54Ω, CD = 50pF (Figure 4)
Full
-
21
45
ns
Driver Differential Output Skew
tSKEW
RD = 54Ω, CD = 50pF (Figure 4)
Full
-
3
6
ns
Driver Differential Rise or Fall Time
tR, tF
RD = 54Ω, CD = 50pF (Figure 4)
Full
5
17
30
ns
Maximum Data Rate
fMAX
CD = 470pF (Figure 6)
Full
15
25
-
Mbps
Driver Enable to Output High
tZH
SW = GND (Figure 5), (Note 9)
Full
-
-
100
ns
Driver Enable to Output Low
tZL
SW = VCC (Figure 5), (Note 9)
Full
-
-
100
ns
Driver Disable from Output Low
tLZ
SW = VCC (Figure 5)
Full
-
-
120
ns
Driver Disable from Output High
tHZ
SW = GND (Figure 5)
Full
-
-
120
ns
(Note 11)
Full
60
160
600
ns
Time to Shutdown
tSHDN
Driver Enable from Shutdown to
Output High
tZH(SHDN)
SW = GND (Figure 5), (Notes 11, 12)
Full
-
-
2000
ns
Driver Enable from Shutdown to
Output Low
tZL(SHDN)
SW = VCC (Figure 5), (Notes 11, 12)
Full
-
-
2000
ns
7
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are VCC = 5V, TA = +25°C
(Note 6). Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNITS
RECEIVER SWITCHING CHARACTERISTICS (250kbps Versions; ISL32470E and ISL32472E)
Maximum Data Rate
fMAX
(Figure 7)
Full
0.25
5
-
Mbps
Receiver Input to Output Delay
tPLH, tPHL
(Figure 7)
Full
-
200
280
ns
Receiver Skew |tPLH - tPHL|
tSKD
(Figure 7)
Full
-
4
10
ns
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8),
(Note 10)
Full
-
-
50
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8),
(Note 10)
Full
-
-
50
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8)
Full
-
-
50
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8)
Full
-
-
50
ns
(Note 11)
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 8),
(Notes 11, 13)
Full
-
-
2000
ns
Receiver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8),
(Notes 11, 13)
Full
-
-
2000
ns
RECEIVER SWITCHING CHARACTERISTICS (1Mbps Versions; ISL32475E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPH|
fMAX
(Figure 7)
Full
1
15
-
Mbps
tPLH, tPHL
(Figure 7)
Full
-
90
150
ns
tSKD
(Figure 7)
Full
-
4
10
ns
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8),
(Note 10)
Full
-
-
50
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8),
(Note 10)
Full
-
-
50
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8)
Full
-
-
50
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8)
Full
-
-
50
ns
(Note 11)
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 8),
(Notes 11, 13)
Full
-
-
2000
ns
Receiver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8),
(Notes 11, 13)
Full
-
-
2000
ns
RECEIVER SWITCHING CHARACTERISTICS (15Mbps Versions; ISL32478E)
Maximum Data Rate
Receiver Input to Output Delay
Receiver Skew |tPLH - tPHL |
fMAX
(Figure 7)
Full
15
25
-
Mbps
tPLH, tPHL
(Figure 7)
Full
-
35
70
ns
tSKD
(Figure 7)
Full
-
4
10
ns
Receiver Enable to Output Low
tZL
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8),
(Note 10)
Full
-
-
50
ns
Receiver Enable to Output High
tZH
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8),
(Note 10)
Full
-
-
50
ns
Receiver Disable from Output Low
tLZ
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8)
Full
-
-
50
ns
Receiver Disable from Output High
tHZ
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8)
Full
-
-
50
ns
8
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Electrical Specifications
Test Conditions: VCC = 4.5V to 5.5V; Unless Otherwise Specified. Typicals are VCC = 5V, TA = +25°C
(Note 6). Boldface limits apply over the operating temperature range, -40°C to +85°C. (Continued)
PARAMETER
TEMP
(°C)
MIN
(Note 14)
TYP
MAX
(Note 14)
UNITS
(Note 11)
Full
60
160
600
ns
SYMBOL
Time to Shutdown
TEST CONDITIONS
tSHDN
Receiver Enable from Shutdown to
Output High
tZH(SHDN)
RL = 1kΩ, CL = 15pF, SW = GND (Figure 8),
(Notes 11, 13)
Full
-
-
2000
ns
Receiver Enable from Shutdown to
Output Low
tZL(SHDN)
RL = 1kΩ, CL = 15pF, SW = VCC (Figure 8),
(Notes 11, 13)
Full
-
-
2000
ns
NOTES:
6. 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.
7. Supply current specification is valid for loaded drivers when DE = 0V.
8. Applies to peak current. See “Typical Performance Curves” beginning on page 13 for more information.
9. Keep RE = 0 to prevent the device from entering SHDN.
10. The RE signal high time must be short enough (typically <100ns) to prevent the device from entering SHDN.
11. Transceivers are put into shutdown by bringing RE high and DE low. If the inputs are in this state for less than 60ns, the parts are guaranteed not to
enter shutdown. If the inputs are in this state for at least 600ns, the parts are guaranteed to have entered shutdown. See “Low Power Shutdown
Mode” on page 13.
12. Keep RE = VCC, and set the DE signal low time >600ns to ensure that the device enters SHDN.
13. Set the RE signal high time >600ns to ensure that the device enters SHDN.
14. Compliance to data sheet limits is assured by one or more methods: production test, characterization and/or design.
15. Tested according to TIA/EIA-485-A, Section 4.2.6 (±80V for 15µs at a 1% duty cycle).
16. See “Caution” statement below the “Recommended Operating Conditions” section on page 5.
Test Circuits and Waveforms
VCC
RL/2
DE
DI
VCC
Z
DI
VOD
D
Y
Z
FIGURE 3A. VOD AND VOC
VOC
VCM
VOD
D
Y
RL/2
375Ω
RL/2
DE
VOC
RL/2
375Ω
FIGURE 3B. VOD AND VOC WITH COMMON MODE LOAD
FIGURE 3. DC DRIVER TEST CIRCUITS
9
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Test Circuits and Waveforms (Continued)
3V
DI
1.5V
1.5V
0V
VCC
DE
CD
D
tPHL
tPLH
Z
DI
RD
Y
OUT (Z)
VOH
OUT (Y)
VOL
SIGNAL
GENERATOR
90%
DIFF OUT (Y - Z)
+VOD
90%
10%
10%
tR
-VOD
tF
SKEW = |tPLH - tPHL|
FIGURE 4A. TEST CIRCUIT
FIGURE 4B. MEASUREMENT POINTS
FIGURE 4. DRIVER PROPAGATION DELAY AND DIFFERENTIAL TRANSITION TIMES
DE
Z
DI
110Ω
VCC
D
SIGNAL
GENERATOR
SW
Y
GND
CL
3V
DE
(Note 11)
1.5V
0V
tZH, tZH(SHDN)
tHZ
OUTPUT HIGH
(Note 11)
OUTPUT
RE
DI
SW
CL (pF)
tHZ
Y/Z
X
1/0
GND
50
tLZ
Y/Z
tZH
Y/Z
0 (Note 9)
tZL
Y/Z
tZH(SHDN)
tZL(SHDN)
X
0/1
VCC
50
1/0
GND
100
0 (Note 9)
0/1
VCC
100
Y/Z
1 (Note 12)
1/0
GND
100
Y/Z
1 (Note 12)
0/1
VCC
100
VOH - 0.5V
2.3V
OUT (Y, Z)
PARAMETER
1.5V
VOH
0V
tZL, tZL(SHDN)
tLZ
(Note 11)
VCC
OUT (Y, Z)
2.3V
VOL + 0.5V
OUTPUT LOW
FIGURE 5A. TEST CIRCUIT
VOL
FIGURE 5B. MEASUREMENT POINTS
FIGURE 5. DRIVER ENABLE AND DISABLE TIMES
VCC
DE
+
Z
DI
54Ω
D
Y
CD
3V
DI
VOD
0V
-
SIGNAL
GENERATOR
+VOD
DIFF OUT (Y - Z)
-VOD
FIGURE 6A. TEST CIRCUIT
0V
FIGURE 6B. MEASUREMENT POINTS
FIGURE 6. DRIVER DATA RATE
10
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Test Circuits and Waveforms (Continued)
B
RE
750mV
15pF
B
R
A
0V
RO
0V
A
-750mV
tPLH
SIGNAL
GENERATOR
tPHL
SIGNAL
GENERATOR
VCC
50%
RO
50%
VCM
0V
FIGURE 7A. TEST CIRCUIT
FIGURE 7B. MEASUREMENT POINTS
FIGURE 7. RECEIVER PROPAGATION DELAY AND DATA RATE
RE
B
A
R
1kΩ
RO
SIGNAL
GENERATOR
15pF
VCC
SW
GND
RE
3V
(Note 11)
1.5V
0V
tZH, tZH(SHDN)
(Note 11)
PARAMETER
1.5V
DE
A
SW
tHZ
0
+1.5V
GND
tLZ
0
-1.5V
VCC
tZL, tZL(SHDN)
tZH (Note 10)
0
+1.5V
GND
(Note 11)
tZL (Note 10)
0
-1.5V
VCC
RO
tZH(SHDN) (Note 13)
0
+1.5V
GND
tZL(SHDN) (Note 13)
0
-1.5V
VCC
FIGURE 8A. TEST CIRCUIT
tHZ
OUTPUT HIGH
1.5V
RO
VOH - 0.5V
VOH
0V
tLZ
VCC
1.5V
VOL + 0.5V
OUTPUT LOW
VOL
FIGURE 8B. MEASUREMENT POINTS
FIGURE 8. RECEIVER ENABLE AND DISABLE TIMES
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,
which allows only one driver and up to 10 (assuming one-unit load
devices) receivers on each bus. RS-485 is a true multipoint standard,
which 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 4000 feet; thus,
the wide CMR is necessary to handle ground potential differences, as
well as voltages induced in the cable by external fields.
The ISL32470E, ISL32472E, ISL32475E, ISL32478E is 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
11
output voltages (VOD) increase noise immunity, while the ±16.5kV
built-in ESD protection complements the fault protection.
Receiver (Rx) Features
These devices utilize 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)”
requirement of 1mA maximum. Thus, 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 guarantees 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 (i.e., an idle bus).
Rx outputs feature high drive levels (typically 22mA @ VOL = 1V) to
ease the design of optically coupled isolated interfaces.
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
The RS-485/RS-422 driver is a differential output device that
delivers 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, and all
drivers are three-statable via the active high DE input.
The 250kbps and 1Mbps driver outputs are slew rate limited to
minimize EMI and to minimize reflections in unterminated or
improperly terminated networks. Outputs of the ISL32478E drivers
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 ISL32470E, ISL32472E,
ISL32475E, ISL32478E perfect for applications where power
(e.g., 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 will destroy 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 ISL32470E, ISL32472E,
ISL32475E, ISL32478E protection is active whether the Tx is enabled or
disabled, and even if the IC is powered down.
If transients or voltages (including overshoots and ringing) greater
than ±60V are possible, then additional external protection is
required.
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 ISL32470E, ISL32472E, ISL32475E,
ISL32478E has extended ±15V CMR, which allows for operation in
environments that would overwhelm lesser transceivers.
Additionally, the Rx will 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 ISL32470E, ISL32472E, ISL32475E, ISL32478E driver design
delivers 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.
12
Hot Plug Function
When a piece of equipment powers up, there is a period of time in
which 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 ISL32470E, ISL32472E, ISL32475E, ISL32478E
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 9 illustrates the
power-up and power-down performance of the ISL32470E, ISL32472E,
ISL32475E, ISL32478E compared to an RS-485 IC without the Hot Plug
feature.
DE, DI = VCC
RE = GND
3.5V
2.8V
5.0
2.5
VCC
VCC (V)
Driver (Tx) Features
0
5.0
RL = 1kΩ
2.5
0
A/Y
ISL3247xE
ISL83088E
RL = 1kΩ
RO
ISL3247xE
5.0
2.5
0
RECEIVER OUTPUT (V)
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).
Another advantage of the large VOD is the ability to drive more than
two bus terminations, which allows for utilizing the ISL32470E,
ISL32472E, ISL32475E, ISL32478E in “star” and other
multi-terminated, nonstandard network topologies. Figure 10 details
the transmitter’s VOD vs IOUT characteristic and includes load lines
for four (30Ω) and six (20Ω) 120Ω terminations. Figure 10 shows
that the driver typically delivers ±1.3V into six terminations, and the
“Electrical Specifications” table guarantees 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 ISL32470E,
ISL32472E, ISL32475E, ISL32478E delivers RS-485 voltage levels
with two to three times the number of terminations.
DRIVER Y OUTPUT (V)
Receivers easily meet the data rates supported by the corresponding
driver, and all receiver outputs are three-statable via the active low
RE input.
TIME
(40µs/DIV)
FIGURE 9. HOT PLUG PERFORMANCE (ISL3247xE) vs ISL83088E
WITHOUT HOT PLUG CIRCUITRY
ESD Protection
All pins on these devices include class 3 (>8kV) Human Body Model
(HBM) ESD protection structures that are good enough to survive
ESD events commonly seen during manufacturing. Even so, the
RS-485 pins (driver outputs and receiver inputs) incorporate more
advanced structures, which allows them to survive ESD events in
excess of ±16.5kV HBM (±15kV for full-duplex versions). The
RS-485 pins are particularly vulnerable to ESD strikes because they
typically connect to an exposed port on the exterior of the finished
product. Simply touching the port pins, or connecting a cable, can
cause an ESD event that might destroy unprotected ICs. These new
ESD structures protect the device whether or not it is powered up,
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
and without interfering with the exceptional ±15V CMR. This built-in
ESD protection minimizes the need for board-level protection
structures (e.g., transient suppression diodes) and the associated,
undesirable capacitive load they present.
Data Rate, Cables, and Terminations
RS-485/RS-422 are intended for network lengths up to 4000 feet,
but the maximum system data rate decreases as the transmission
length increases. Devices operating at 15Mbps may be used at
lengths up to 150 feet (46m), but the distance can be increased to
328 feet (100m) by operating at 10Mbps. The 1Mbps versions can
operate at full data rates with lengths up to 800 feet (244m). Jitter is
the limiting parameter at these faster data rates, so employing
encoded data streams (e.g., Manchester coded or Return-to-Zero)
may allow increased transmission distances. The slow versions can
operate at 115kbps or less at the full 4000-foot (1220m) distance,
or at 250kbps for lengths up to 3000 feet (915m). DC cable
attenuation is the limiting parameter, so using better-quality cables
(e.g., 22 AWG) may allow increased transmission distance.
Twisted pair is the cable of choice for RS-485/RS-422 networks.
Twisted-pair cables tend to pick up noise and other
electromagnetically induced voltages as common mode signals,
which are effectively rejected by the differential receivers in these
ICs.
Proper termination is imperative, when using the 15Mbps devices, to
minimize reflections. Short networks using the 250kbps versions
need not be terminated; however, terminations are recommended
unless power dissipation is an overriding concern.
In point-to-point or point-to-multipoint (single driver on bus like
RS-422) networks, the main cable should be terminated in its
characteristic impedance (typically 120Ω) at the end farthest from
the driver. In multi-receiver applications, stubs connecting receivers
to the main cable should be kept as short as possible. Multipoint
(multi-driver) systems require that the main cable be terminated in
its characteristic impedance at both ends. Stubs connecting a
transceiver to the main cable should be kept as short as possible.
Typical Performance Curves
+25°C
RD = 54Ω
+85°C
50
40
RD = 100Ω
30
20
10
0
0
1
In the event of a major short circuit condition, devices also include a
thermal shutdown feature that disables the drivers whenever the die
temperature becomes excessive. This eliminates the power
dissipation, allowing the die to cool. The drivers automatically
re-enable after the die temperature drops by about 15°C. If the
contention persists, the thermal shutdown/re-enable cycle repeats
until the fault is cleared. Receivers stay operational during thermal
shutdown.
Low Power Shutdown Mode
These BiCMOS 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 guarantees that the transceiver will not enter shutdown.
Note that receiver and driver enable times increase when the
transceiver enables from shutdown. Refer to Notes 9, 10, 11, 12 and
13 on page 9, at the end of the “Electrical Specifications” table, for
more information.
VCC = 5V, TA = +25°C; Unless Otherwise Specified.
RD = 30Ω
70
60
The driver output stages incorporate a double foldback 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 foldback 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 foldback current setting (≈9mA) minimizes power dissipation
if the Tx is enabled when a fault occurs.
3.6
RD = 20Ω
80
As stated previously, the RS-485 specification requires that drivers
survive worst-case bus contentions undamaged. These transceivers
meet this requirement via driver output short circuit current limits
and on-chip thermal shutdown circuitry.
DIFFERENTIAL OUTPUT VOLTAGE (V)
DRIVER OUTPUT CURRENT (mA)
90
Built-In Driver Overload Protection
2
3
4
5
DIFFERENTIAL OUTPUT VOLTAGE (V)
FIGURE 10. DRIVER OUTPUT CURRENT vs DIFFERENTIAL OUTPUT
VOLTAGE
13
3.4
RD = 100Ω
3.2
3.0
2.8
2.6
RD = 54Ω
2.4
2.2
-40
-25
0
25
50
TEMPERATURE (°C)
75
85
FIGURE 11. DRIVER DIFFERENTIAL OUTPUT VOLTAGE vs
TEMPERATURE
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Typical Performance Curves
VCC = 5V, TA = +25°C; Unless Otherwise Specified. (Continued)
70
2.40
RECEIVER OUTPUT CURRENT (mA)
2.45
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
150
40
30
20
10
0
-10
VOH, +85°C
-20
VOH, +25°C
0
1
2
3
4
RECEIVER OUTPUT VOLTAGE (V)
5
800
+85°C
600
BUS PIN CURRENT (µA)
Y OR Z = LOW
50
+25°C
0
-50
Y OR Z = HIGH
+25°C
-100
+85°C
-150
-60 -50 -40 -30 -20 -10
400
200
Y or Z
0
-200
-400
A/Y or B/Z
-600
0
10
20
30
40
50
60
-70
-50
-30
FIGURE 14. DRIVER OUTPUT CURRENT vs SHORT CIRCUIT VOLTAGE
30
50
70
FIGURE 15. BUS PIN CURRENT vs BUS PIN VOLTAGE
8
340
-10 0 10
BUS PIN VOLTAGE (V)
OUTPUT VOLTAGE (V)
RD = 54Ω, CD = 50pF
RD = 54Ω, CD = 50pF
7
335
6
330
tPLH
325
SKEW (ns)
PROPAGATION DELAY (ns)
VOL, +85°C
FIGURE 13. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT
VOLTAGE
100
OUTPUT CURRENT (mA)
VOL, +25°C
50
-30
85
FIGURE 12. SUPPLY CURRENT vs TEMPERATURE
60
320
315
tPHL
310
5
4
3
2
305
1
300
0
|tPLH - tPHL|
-40
-25
0
25
TEMPERATURE (°C)
50
75
FIGURE 16. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL32470E, ISL32472E)
14
85
-40
-25
0
50
25
TEMPERATURE (°C)
75
85
FIGURE 17. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL32470E, ISL32472E)
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Typical Performance Curves
VCC = 5V, TA = +25°C; Unless Otherwise Specified. (Continued)
4.0
85
RD = 54Ω, CD = 50pF
RD = 54Ω, CD = 50pF
3.5
75
SKEW (ns)
PROPAGATION DELAY (ns)
80
70
tPLH
65
3.0
tPHL
60
2.5
55
50
-40
0
-25
25
50
75
2.0
-40
85
|tPLH - tPHL|
-25
0
TEMPERATURE (°C)
FIGURE 18. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL32475E)
RD = 54Ω, CD = 50pF
3.2
25
3.0
23
tPLH
21
19
tPHL
|tPLH - tPHL|
-25
25
0
50
TEMPERATURE (°C)
75
2.0
-40
85
A
15
B
VID = ±1V
10
5
VOLTAGE (V)
VOLTAGE (V)
0
25
50
TEMPERATURE (°C)
75
85
A
B
VID = ±1V
5
RO
0
RO
0
RO
0
5
RO
0
-5
-5
-15
-25
FIGURE 21. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL32478E)
5
-10
2.6
2.2
FIGURE 20. DRIVER DIFFERENTIAL PROPAGATION DELAY vs
TEMPERATURE (ISL32478E)
10
2.8
2.4
17
15
85
3.4
RD = 54Ω, CD = 50pF
15
-40
75
FIGURE 19. DRIVER DIFFERENTIAL SKEW vs TEMPERATURE
(ISL32475E)
SKEW (ns)
PROPAGATION DELAY (ns)
27
25
50
TEMPERATURE (°C)
-10
A
-15
B
TIME (1µs/DIV)
FIGURE 22. RECEIVER PERFORMANCE WITH ±15V CMV
(ISL32470E, ISL32472E)
15
A
B
TIME (400ns/DIV)
FIGURE 23. RECEIVER PERFORMANCE WITH ±15V CMV
(ISL32475E)
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
10
VID = ±1V
5
5
DRIVER OUTPUT (V)
RO
0
RO
0
-5
-10
A
-15
B
RD = 54Ω, CD = 50pF
DI
0
5
RO
0
3
2
1
0
-1
-2
-3
A/Y - B/Z
TIME (1µs/DIV)
TIME (20ns/DIV)
5
RO
0
3
2
1
0
-1
-2
-3
A/Y - B/Z
TIME (400ns/DIV)
FIGURE 26. DRIVER AND RECEIVER WAVEFORMS (ISL32475E)
DRIVER OUTPUT (V)
0
DRIVER INPUT (V)
RECEIVER OUTPUT (V)
DRIVER OUTPUT (V)
DI
5
RECEIVER OUTPUT (V)
FIGURE 25. DRIVER AND RECEIVER WAVEFORMS (ISL32470E,
ISL32472E)
FIGURE 24. RECEIVER PERFORMANCE WITH ±15V CMV
(ISL32478E)
RD = 54Ω, CD = 50pF
5
RD = 54Ω, CD = 50pF
DI
5
0
5
0
3
2
1
0
-1
-2
-3
RO
DRIVER INPUT (V)
B
DRIVER INPUT (V)
A
15
VOLTAGE (V)
VCC = 5V, TA = +25°C; Unless Otherwise Specified. (Continued)
RECEIVER OUTPUT (V)
Typical Performance Curves
A/Y - B/Z
TIME (20ns/DIV)
FIGURE 27. DRIVER AND RECEIVER WAVEFORMS (ISL32478E)
Die Characteristics
SUBSTRATE POTENTIAL (POWERED UP):
GND
PROCESS:
Si Gate BiCMOS
16
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Revision History
The revision history provided is for informational purposes only and is believed to be accurate, but not warranted. Please go to web to make sure you
have the latest Rev.
DATE
REVISION
CHANGE
January 21, 2011
FN7784.0
Initial Release
Products
Intersil Corporation is a leader in the design and manufacture of high-performance analog semiconductors. The Company's products address
some of the industry's fastest growing markets, such as, flat panel displays, cell phones, handheld products, and notebooks. Intersil's product
families address power management and analog signal processing functions. Go to www.intersil.com/products for a complete list of Intersil
product families.
*For a complete listing of Applications, Related Documentation and Related Parts, please see the respective device information page on
intersil.com: ISL32470E, ISL32472E, ISL32475E, ISL32478E.
To report errors or suggestions for this data sheet, please go to www.intersil.com/ask our staff
FITs are available from our web site at http://rel.intersil.com/reports/search.php
For additional products, see www.intersil.com/product_tree
Intersil products are manufactured, assembled and tested utilizing ISO9000 quality systems as noted
in the quality certifications found at www.intersil.com/design/quality
Intersil products are sold by description only. Intersil Corporation reserves the right to make changes in circuit design, software and/or specifications at any time
without notice. Accordingly, the reader is cautioned to verify that data sheets are current before placing orders. Information furnished by Intersil is believed to be
accurate and reliable. However, no responsibility is assumed by Intersil or its subsidiaries for its use; nor for any infringements of patents or other rights of third
parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Intersil or its subsidiaries.
For information regarding Intersil Corporation and its products, see www.intersil.com
17
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Package Outline Drawing
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
18
FN7784.0
January 21, 2011
ISL32470E, ISL32472E, ISL32475E, ISL32478E
Package Outline Drawing
M8.15
8 LEAD NARROW BODY SMALL OUTLINE PLASTIC PACKAGE
Rev 2, 11/10
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
2.41 (0.095)
SEATING PLANE
5.00 (0.197)
4.80 (0.189)
1.75 (0.069)
1.35 (0.053)
1
8
2
7
0.76 (0.030)
1.27 (0.050)
3
6
4
5
-C-
1.27 (0.050)
0.51(0.020)
0.33(0.013)
SIDE VIEW “A
0.25(0.010)
0.10(0.004)
0.200
TYPICAL RECOMMENDED LAND PATTERN
NOTES:
1. Dimensioning and tolerancing per ANSI Y14.5M-1982.
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.
19
FN7784.0
January 21, 2011