Analog Devices ADM3082 5 8 pra Datasheet

PRELIMINARY TECHNICAL DATA
Preliminary Technical Data
REV. PrA 02/02
High-Speed (10Mbps), Fail-Safe, RS-485/RS-422
Transceivers with Slew-Rate-Limiting
a
FEATURES
Enhanced Slew Rate Limiting for Error-Free Data Transmission
Fail-Safe Receiver Operation while Maintaining EIA/TIA-485 compatibility
Low-Current (1nA) Shutdown Mode
High Input Impedance — Up to 256 Transceivers on Bus
±15kV ESD Protection (Human Body Model) on RS-485 I/O pins
Pin-Compatible with Industry Standard 75176
APPLICATIONS
Enhanced Replacement for Industry-Standard Parts EMI-Sensitive Systems Level Translation LANs for Industrial Control Applications
and ±15kV ESD Protection
ADM3082/ADM3085/ADM3088
GENERAL DESCRIPTION
The ADM3082/ADM3085/ADM3088 are high-speed RS-485/RS-422 transceivers consisting of one driver and one receiver per package. The devices feature fail-safe operation, ensuring a logic-high receiver output when the receiver in­puts are open-circuit or short-circuit. This guarantees that the receiver output will be high if all the transmitters on a terminated bus are disabled (high-impedance).
The ADM3082 has a slew-rate limited driver to minimize electromagnetic interference (EMI) and reduce reflections caused by incorrectly terminated cables. This allows error­free transmission at data rates up to 115kbps.
The ADM3085 offers a higher slew rate allowing data rates up to 500kbps, while the ADM3088 has a driver whose slew rate is not limited, allowing data rates up to 10Mbps.
All devices in the family feature ±15kV electrostatic dis­charge (ESD) protection and high receiver input imped­ance (1/8 unit load), allowing up to 256 transceivers on the bus. The devices have low current drain of 375µA un­loaded, or fully loaded with the drivers disabled, and fea­ture an ultra-low power (1nA) shutdown mode.
Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices 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 Analog Devices.
FUNCTIONAL BLOCK DIAGRAM
RO
1
R
2
RE
3
DE
4
DI
ADM3082/ADM3085/ADM3088
D
V
8
CC
7
B
6
A
GND
5
One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700World Wide Web Site: http://www.analog.com Fax: 617/326-8703 © Analog Devices, Inc., 2002
PRELIMINAR Y TECHNICAL DA T A
REV. PrA 02/02
ADM3082/ADM3085/ADM3088
ADM3082/ADM3085/ADM3088 SPECIFICATIONS
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, TA = T
DRIVER
Parameter Min Typ Max Units Test Conditions/Comments
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
MAX
Differential Driver Output, V
Differential Driver Output,V
OD1
OD2
2.0 V Figure 1, R = 50V (RS-422)
5 V Figure 1 (No Load)
1.5 V Figure 1, R = 27V (RS-485)
Change-in-Magnitude of Differential 0.2 V Figure 1, R = 50V or R = 27V Common-Mode Output Voltage, DV
OD
(Note 2)
Driver Common-Mode 3 V Figure 1, R = 50V or R = 27V Output Voltage, V
OC
Change-in-Magnitude of 0.2 V Figure 1, R = 50V or R = 27V Common-Mode Voltage, DV
Input High Voltage,V
IH1
OC
2.0 V
(Note 2)
(DE, DI, RE)
Input Low Voltage, V
lL1
0.8 V
(DE, DI, RE)
DI Input Hysteresis, V
Input Current, I
Input Current (A and B), I
HYS
(DE, DI, RE2µA
IN1
IN4
100 mV
125 µA DE = GND, V
–75 µ A DE = GND, V
V
IN
= 12V
= GND or 5.25V,
CC
= GND or 5.25V,
CC
VIN = –7V
Output Leakage (Y and Z), 125 µA DE = GND, V Full Duplex, I
O
VIN = 12V
–100 µA DE = GND, V
= GND or 5.25V,
CC
= GND or 5.25V,
CC
VIN = –7V
Driver Short-Circuit,V
OD1
–250 mA –7V # V
Output Current 250 mA 0V # V
±25 mA 0V # V
–2–
# VCC (Note 3)
OUT
# 12V (Note 3)
OUT
# VCC (Note 3)
OUT
PRELIMINAR Y TECHNICAL DA T A
REV. PrA 02/02
ADM3082/ADM3085/ADM3088
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
DC ELECTRICAL CHARACTERISTICS
(VCC = +5V ±5%, TA = T
RECEIVER
Parameter Min Typ Max Units Test Conditions/Comments
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
MAX
Receiver Differential Threshold –200 –125 –50 mV –7V # V Voltage, V
Receiver Input Hysteresis, DV
Receiver Output High Voltage, V
Receiver Output Low Voltage, V
TH
TH
OL
OH
25 mV
VCC –1 .5 V IO = -4mA, VID = -50mV
0.4 V IO = 4mA, VID = -200mV
# 12V
CM
Three-State Output Current at ±1 µA 0.4V # VO # 2.4V Receiver, I
Receiver Input Resistance, R
Receiver Output Short-Circuit ±7 ±95 mA 0V # VRO # V Current, I
OZR
OSR
IN
96 kV –7V # VCM # 12V
CC
SUPPLY CURRENT
Parameter Min Typ Max Units Test Conditions/Comments
Supply Current, I
CC
430 900 µA No load, RE = DI = GND or VCC,
DE = V
CC
375 600 µA No load, RE = DI = GND or VCC,
DE = GND
Supply Current in 0.001 10 µ A DE = GND, VRE = V Shutdown Mode, I
SHDN
CC
ESD Protection for Y, Z, A, B ±15 kV Human Body Model
NOTES
1
All currents into the device are positive; all currents out of the device are negative. All voltages are referred to device ground unless otherwise noted.
2
DDO and DVCC are the changes in VOD and VOC, respectively, when the DI input changes state.
3
Maximum current level applies to peak current just prior to foldback-current limiting; minimum current level applies during current limiting.
–3–
PRELIMINAR Y TECHNICAL DA T A
REV. PrA 02/02
ADM3082/ADM3085/ADM3088
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
SWITCHING CHARACTERISTICS—ADM3082
(VCC = +5V ±5%, TA = T
Parameter Min Typ Max Units Test Conditions/Comments
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
MAX
Driver Input-to-Output, t Driver Input-to-Output, t
Driver Output Skew,|t
Driver Rise or Fall Time, t
Maximum Data Rate, f
Driver Enable to Output High, t
Driver Enable to Output Low, t
Driver Disable Time from Low, t
Driver Disable Time from High, t
Receiver Input to Output, t
Differential Receiver Skew, t |t
- t
RPLH
| rise and fall time of VID # l5ns
RPHL
Receiver Enable to Output Low, t
DPLH DPHL
DPLH-tDPHL
, t
DR
MAX
RPLH
RSKD
, t
|, t
DF
DZH
DZL
DLZ
DHZ
RPHL
RZL
DSKEW
500 2030 2600 ns Figures 2 and 3, R 500 2030 2600 ns CL1 = CL2 = 100pF
–3 ±200 ns Figures 2 and 3, R
CL1 = CL2 = 100pF
667 1320 2500 ns Figures 2 and 3, R
CL1 = CL2 = 100pF
115 kbps
3500 ns Figures 5 and 6, CL = 100pF,
S2 closed
3500 ns Figures 5 and 6, CL = 100pF,
S1 closed
100 ns Figures 5 and 6, CL = l5pF,
S1 closed
100 ns Figures 4 and 5, CL = l5pF,
S2 closed
127 200 ns Figure 7; |VID| $ 2.0V;
rise and fall time of VID # l5ns
3 ±30 ns Figure 7; |VID| $ 2.0V;
20 50 ns Figures 7 and 8; CL = 100pF,
S1 closed
DIFF
DIFF
DIFF
= 54V,
= 54V,
= 54V,
Receiver Enable to Output High, t
RZH
20 50 ns Figures 7 and 8, CL = 100pF,
S2 closed
Receiver Disable Time from Low, t
RLZ
20 50 ns Figures 7 and 8, CL = 100pF,
S1 closed
Receiver Disable Time from High, t
RHZ
20 50 ns Figures 7 and 8 CL = 100pF,
S2 closed
Time to Shutdown, t
SHDN
Driver Enable from Shutdown to 6000 ns Figures 5 and 6, C Output High, t
DZH(SHDN)
Driver Enable from Shutdown to 6000 ns Figures 5 and 6, C Output Low, t
DZL(SHDN)
50 200 600 ns (Note 5)
S2 closed
S1 closed
= l5pF,
L
= l5pF,
L
Receiver Enable from Shutdown 3500 ns Figures 7 and 8, CL = 100pF, to Output High, t
RZH(SHDN)
S2 closed
Receiver Enable from Shutdown 3500 ns Figures 7 and 8, CL = 100pF, to Output Low, t
RZL(SHDN)
S1 closed
–4–
PRELIMINAR Y TECHNICAL DA T A
REV. PrA 02/02
ADM3082/ADM3085/ADM3088
ADM3082/ADM3085/ADM3088 SPECIFICATIONS (continued)
SWITCHING CHARACTERISTICS—ADM3085
(VCC = +5V ±5%, TA = T
Parameter Min Typ Max Units Test Conditions/Comments
MIN
to T
, unless otherwise noted. Typical values are at VCC = +5V and TA = +25°C.) (Note 1)
MAX
Driver Input-to-Output, t Driver Input-to-Output, t
Driver Output Skew,|t
Driver Rise or Fall Time, t
Maximum Data Rate, f
Driver Enable to Output High, t
Driver Enable to Output Low, t
Driver Disable Time from Low, t
Driver Disable Time from High, t
Receiver Input to Output, t
Differential Receiver Skew, t |t
- t
RPLH
| rise and fall time of VID # l5ns
RPHL
Receiver Enable to Output Low, t
DPLH
MAX
DPLH DPHL
- t
DR
RPLH
DPHL
, t
, t
RSKD
|, t
DF
DZH
DZL
DLZ
DHZ
RPHL
RZL
DSKEW
250 720 1000 ns Figures 2 and 3 R
DIFF
250 720 1000 ns CL1 = CL2 = 100pF
–3 ±100 ns Figures 2 and 3, R
CL1 = CL2 = 100pF
200 530 750 ns Figures 2 and 3, R
CL1 = CL2 = 100pF
500 kbps
2500 ns Figures 5 and 6, CL = 100pF,
S2 closed
2500 ns Figures 5 and 6, CL = 100pF,
S1 closed
100 ns Figures 5 and 6, CL = l5pF,
S1 closed
100 ns Figures 5 and 6, CL = l5pF,
S2 closed
127 200 ns Figure 7; |VID| $ 2.0V;
rise and fall time of VID # l5ns
3 ±30 ns Figure 7; |VID| $ 2.0V;
20 50 ns Figures 7 and 8 CL = 100pF,
S1 closed
= 54V,
DIFF
DIFF
= 54V,
= 54V,
Receiver Enable to Output High, t
RZH
20 50 ns Figures 7 and 8, CL = 100pF,
S2 closed
Receiver Disable Time from Low, t
RLZ
20 50 ns Figures 7 and 8, CL = 100pF,
S1 closed
Receiver Disable Time from High, t
RHZ
20 50 ns Figures 7 and 8, CL = 100pF,
S2 closed
Time to Shutdown, t
SHDN
50 200 600 ns (Note 5)
Driver Enable from Shutdown 4500 ns Figures 5 and 6, CL = l5pF, to Output High, t
DZH(SHDN)
S2 closed
Driver Enable from Shutdown 4500 ns Figures 5 and 6, CL = l5pF, to Output Low, t
OZL(SHDN)
Receiver Enable from Shutdown 3500 ns Figures 7 and 8, C to Output High, t
RZH(SHDN)
Receiver Enable from Shutdown 3500 ns Figures 7 and 8, C to Output Low, t
RZL(SHDN)
S1 closed
S2 closed
S1 closed
= 100pF,
L
= 100pF,
L
–5–
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