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PDF ISL3178AE Data sheet ( Hoja de datos )
| Número de pieza | ISL3178AE | |
| Descripción | RS-485/RS-422 Transceivers | |
| Fabricantes | Intersil Corporation | |
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Data Sheet
May 6, 2009
ISL3178AE
FN6887.1
±15kV ESD Protected, 3.3V, Full Fail-Safe,
Low Power, High Speed or Slew Rate
Limited, RS-485/RS-422 Transceivers
The Intersil ISL3178AE is ±15kV IEC61000 ESD Protected,
3.3V-powered, single transceivers that meet both the
RS-485 and RS-422 standards for balanced communication.
This device has very low bus currents (+125mA/-100mA),
which presents a true “1/8 unit load” to the RS-485 bus. This
allows up to 256 transceivers on the network without violating
the RS-485 specification’s 32 unit load maximum, and without
using repeaters. For example, in a remote utility meter reading
system, individual meter readings are routed to a concentrator
via an RS-485 network, so the high allowed node count
minimizes the number of repeaters required.
Receiver (Rx) inputs feature a “Full Fail-Safe” design, which
ensures a logic high Rx output if Rx inputs are floating,
shorted, or terminated but undriven.
Hot Plug circuitry ensures that the Tx and Rx outputs remain
in a high impedance state while the power supply stabilizes.
The ISL3178AE is a half duplex version. It multiplexes the
Rx inputs and Tx outputs to allow transceivers with output
disable functions in an 8 Ld package.
Pinout
ISL3178AE
(8 LD SOIC)
TOP VIEW
RO 1
RE 2
DE 3
DI 4
R
D
8 VCC
7 B/Z
6 A/Y
5 GND
Features
• IEC61000 ESD Protection on RS-485 I/O Pins . . . . ±15kV
- Class 3 ESD Level on all Other Pins . . . . . . >7kV HBM
• Full Fail-safe (Open, Short, Terminated/Floating)
Receivers
• Hot Plug - Tx and Rx Outputs Remain Three-state During
Power-up (Only Versions with Output Enable Pins)
• True 1/8 Unit Load Allows up to 256 Devices on the Bus
• Single 3.3V Supply
• High Data Rates . . . . . . . . . . . . . . . . . . . . . . up to 10Mbps
• Low Quiescent Supply Current . . . . . . . . . . .800µA (Max)
- Ultra Low Shutdown Supply Current . . . . . . . . . . .10nA
• -7V to +12V Common Mode Input/Output Voltage Range
• Half Duplex Pinouts
• Three State Rx and Tx Outputs Available
• Current Limiting for Driver Overload Protection
• Pb-Free (RoHS Compliant)
Applications
• Automated Utility Meter Reading Systems
• High Node Count Systems
• Field Bus Networks
• Security Camera Networks
• Building Environmental Control/ Lighting Systems
• Industrial/Process Control Networks
PART
NUMBER
HALF/FUL DATA RATE
L DUPLEX (Mbps)
ISL3178AEM
HALF
10
ISL3178AEMW HALF
10
TABLE 1. SUMMARY OF FEATURES
SLEW-
RATE
LIMITED?
HOT
PLUG?
#
DEVICES
ON BUS
RX/TX
ENABLE?
NO
YES
256
YES
NO
YES
256
YES
QUIESCENT
ICC (µA)
510
510
LOW POWER PIN
SHUTDOWN? COUNT
YES
8
YES
N/A
1 CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
1-888-INTERSIL or 1-888-468-3774 | Intersil (and design) is a registered trademark of Intersil Americas Inc.
Copyright Intersil Americas Inc. 2009. All Rights Reserved
All other trademarks mentioned are the property of their respective owners.
1 page  
ISL3178AE
www.EDaletacSthreiceat4lUS.cpoemcifications
Test Conditions: VCC = 3.0V to 3.6V; Unless Otherwise Specified. Typicals are at VCC = 3.3V, TA = +25°C,
(Note 2). 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.
PARAMETER
SYMBOL
TEST CONDITIONS
TEMP
(°C)
MIN
TYP MAX UNITS
SUPPLY CURRENT
No-Load Supply Current (Note 3)
ICC DI = 0V or VCC
DE = VCC,
RE = 0V or VCC
DE = 0V, RE = 0V
Full
Full
- 510 800 µA
- 480 700 µA
Shutdown Supply Current
ESD PERFORMANCE
ISHDN DE = 0V, RE = VCC, DI = 0V or VCC
Full
-
0.01 12
µA
RS-485 Pins (A/Y, B/Z)
IEC61000-4-2, Air-Gap Discharge Method
25
- ±15 - kV
IEC61000-4-2, Contact Discharge Method
25
-
±8
- kV
Human Body Model, From Bus Pins to GND 25
- ±15 - kV
All Pins
HBM, per MIL-STD-883 Method 3015
25 - ±7 - kV
Machine Model
25 - 200 - V
DRIVER SWITCHING CHARACTERISTICS (ISL3178AE)
Maximum Data Rate
fMAX
VOD = ±1.5V, CD = 350pF (Figure 4,
Note 12)
Full - 10 - Mbps
Driver Differential Output Delay
Driver Differential Output Skew
Driver Output Skew, Part-to-Part
tDD
tSKEW
ΔtDSKEW
RDIFF = 54Ω, CD = 50pF (Figure 2)
RDIFF = 54Ω, CD = 50pF (Figure 2)
RDIFF = 54Ω, CD = 50pF (Figure 2,
Notes 10, 12)
Full - 27 40 ns
Full - 1 3 ns
Full -
- 11 ns
Driver Differential Rise or Fall Time tR, tF RDIFF = 54Ω, CD = 50pF (Figure 2)
Full -
9 15 ns
Driver Enable to Output High
tZH RL = 500Ω, CL = 50pF, SW = GND (Figure 3), Full - 17 50 ns
(Note 5)
Driver Enable to Output Low
tZL RL = 500Ω, CL = 50pF, SW = VCC (Figure 3), Full - 16 40 ns
(Note 5)
Driver Disable from Output High tHZ RL = 500Ω, CL = 50pF, SW = GND (Figure 3) Full - 25 40 ns
Driver Disable from Output Low
tLZ RL = 500Ω, CL = 50pF, SW = VCC (Figure 3), Full
-
28 50 ns
Time to Shutdown
tSHDN (Notes 7, 12)
Full 50 200 600 ns
Driver Enable from Shutdown to tZH(SHDN) RL = 500Ω, CL = 50pF, SW = GND (Figure 3), Full - 180 700 ns
Output High
(Notes 7, 8)
Driver Enable from Shutdown to tZL(SHDN) RL = 500Ω, CL = 50pF, SW = VCC (Figure 3), Full - 90 700 ns
Output Low
(Notes 7, 8)
RECEIVER SWITCHING CHARACTERISTICS (ISL3178AE)
Maximum Data Rate
fMAX VID = ±1.5V (Note 12)
Full - 10 - Mbps
Receiver Input to Output Delay
tPLH, tPHL (Figure 5)
Full 25 33 65 ns
Receiver Skew | tPLH - tPHL |
tSKD (Figure 5)
Full - 1.5 10 ns
Receiver Skew, Part-to-Part
ΔtRSKEW (Figure 5, Notes 10, 12)
Full -
- 15 ns
Receiver Enable to Output High
tZH RL = 1kΩ, CL = 15pF, SW = GND (Figure 6), Full
(Notes 6)
5
11 17 ns
Receiver Enable to Output Low
tZL RL = 1kΩ, CL = 15pF, SW = VCC (Figure 6), Full 5 11 17 ns
(Notes 6,)
Receiver Disable from Output High tHZ RL = 1kΩ, CL = 15pF, SW = GND (Figure 6), Full
4
7 15 ns
Receiver Disable from Output Low tLZ RL = 1kΩ, CL = 15pF, SW = VCC (Figure 6), Full
4
7 15 ns
Time to Shutdown
tSHDN (Notes 7, 12)
Full 50 180 600 ns
5 FN6887.1
May 6, 2009
5 Page 
ISL3178AE
www.TDaytapSihceaetl4UP.ceormformance Curves VCC = 3.3V, TA = +25°C; Unless Otherwise Specified (Continued)
40 1.6
35
TPHL
1.5
30
TPLH
1.4
25
20 1.3
15
1.2
10
1.1
5
0
-60 -45 -30 -15 0 15 30 45 60 75 90 105 120
TEMPERATURE (°C)
FIGURE 11. DRIVER DIFFERENTIAL PROPAGATION DELAY
vs TEMPERATURE)
1
-60 -45 -30 -15 0 15 30 45 60 75
TEMPERATURE (°C)
FIGURE 12. DRIVER DIFFERENTIAL SKEW vs
TEMPERATURE
90 105 120
DI
5
0
RDIFF = 54Ω, CD = 50pF
5
0
RO
DI
5
0
RDIFF = 54Ω, CD = 50pF
5
0
RO
3.0
2.5 B/Z
2.0
1.5
1.0 A/Y
0.5
0
TIME (10ns/DIV)
FIGURE 13. DRIVER AND RECEIVER WAVEFORMS,
LOW TO HIGH
3.0
2.5 A/Y
2.0
1.5
1.0 B/Z
0.5
0
TIME (10ns/DIV)
FIGURE 14. DRIVER AND RECEIVER WAVEFORMS,
HIGH TO LOW
35
30 VOL, +25°C
25
20 VOH, +25°C
VOL, +85°C
15
VOH, +85°C
10
5
0
0 0.5 1.0 1.5 2.0 2.5 3.0 3.5
RECEIVER OUTPUT VOLTAGE (V)
FIGURE 15. RECEIVER OUTPUT CURRENT vs RECEIVER OUTPUT VOLTAGE
11 FN6887.1
May 6, 2009
11 Page | ||
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