ZT485E Low Power 5V 250kbps/10Mbps RS485 Transceivers
Zywyn Corporation
ZT4xxE
Zywyn
Features
• Meets or exceeds the requirements of ANSI Stan-
dard TIA/EIA-485-A and ISO 8482:1987(E) specifi-
cations for V
CC
at +5V ±5%
• Low quiescent current – 0.5mA typ., 1mA max.
• Low shutdown current (where applicable) - 0.01µA
typical, 10µA max.
• Guaranteed standard data rate 250kbps or 10Mbps
• Thermal shutdown protection
• -7V to +12V common-mode input voltage range
• Half-Duplex or Full-Duplex configuration
• Allows up to 1 unit load (32 devices) on the same
common bus
• Controlled driver output slew rate and receiver input
filtering
• Active-high driver enable and active-low receiver
enable
• ESD Protection on bus terminals
±15kV Human Body Model (HBM)
• Drop-in Replacements for MAX483E, MAX485E,
MAX488E, MAX489E, MAX490E, MAX491E.
• High fanout driving 1/4 unit load (128 devices)
available on ZT485ER Series
ZT483E, ZT485E, ZT488E
ZT489E, ZT490E, ZT491E
Low Power 5V 250kbps/10Mbps RS485 Transceivers
General Description
The ZT485E series devices are 5V differential data line
transceivers for RS485/RS422 communication that consist
of one driver and one receiver with high level of ESD
protection. They are designed for balanced transmission
lines interface that meet ANSI standard TIA/EIA-485-A and
ISO 8482:1987(E) specifications.
The ZT485E series devices spans out with half or full duplex,
data rate guaranteed at 250k bit per second or 10Mbps, and
allow one unit load that fan out 32 devices sharing a common
bus. The I/Os are enhanced-electrostatic discharge (ESD)
protected, exceeding ±15kV Human Body Model (HBM).
Applications
•
•
•
•
•
•
•
•
•
•
RS422/RS485 communications
Utility meters
Industrial process control
Building automation
Level tranlators
Transceivers for EMI-sensitive applications
Routers and HUBs
Industrial-controlled Local Area Networks
Industrial PCs, embedded PCs and peripherals
Industrial, security CATV and camera applications
ZT483E/ZT485E
Product Selection Guide And Cross Reference
Part
# 0f
Duplex
Number
Tx/Rx
ZT483E
ZT485E
ZT488E
ZT489E
ZT490E
ZT491E
Half
Half
Full
Full
Full
Full
1/1
1/1
1/1
1/1
1/1
1/1
Data
# of
Rate
Tx/Rx
(Mbps) on Bus
0.25
10
0.25
0.25
10
10
32
32
32
32
32
32
Slew
Rate
Limit
Yes
No
Yes
Yes
No
No
Now Available in Green Package Option
ESD
on
Tx/Rx
± 15kV
± 15kV
± 15kV
± 15kV
± 15kV
± 15kV
Number
of Pins
8
8
8
14
8
14
Pin-to-Pin
Cross
Reference
Rx
Low-
Tx/Rx
Input
Power
Enable
Filtering Shutdown
Yes
No
Yes
Yes
No
No
Yes
Yes
No
Yes
No
Yes
Yes
Yes
No
Yes
No
Yes
MAX483E
MAX485E
MAX488E
MAX489E
MAX490E
MAX491E
Zywyn
1
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation • Tel (408) 733-3225 • Fax (408) 733-3206 • Email sales@zywyn.com • www.zywyn.com
Zywyn Corporation
Absolute Maximum Ratings
These are stress ratings only and functional operation of
the device at these ratings or any other above those
indicated in the operation sections of the specifications is
not implied. Exposure to absolute maximum rating condi-
tions for extended periods of time may affect reliability.
Power Supply, (V
CC
) .................................. –0.3V to +6.0V
Input Voltages
DI, DE, RE (V
IH
), High Input Voltage .............. +2V to +6.0V
DI, DE, RE (V
IL
), Low Input Voltage ............... 0V to +0.8V
Differential Input Voltage, (V
ID
) ..................... -12V to +12V
A, B (V
I
) .......................................................... +12V to -7V
Output Voltages
RO ..................................................... –0.3V to (V
CC
+0.3V)
Y, Z (A & B on ZT485) ...................................... +12V to -7V
Operating Temperature ................................ –40°C to +85°C
Storage Temperature ................................. –65°C to +150°C
Power Dissipation Per Package
8-pin PDIP (derate 9.09mW/°C above +70°C) ........... 722mW
8-pin nSOIC (derate 6.14mW/°C above +70°C) ........ 500mW
14-pin PDIP (derate 10.00mW/°C above +70°C) ........ 800mW
14-pin nSOIC (derate 8.33mW/°C above +70°C) ...... 667mW
ZT4xxE
Storage Considerations
Storage in a low humidity environment is preferred. Large
high density plastic packages are moisture sensitive and
should be stored in Dry Vapor Barrier Bags. Prior to usage,
the parts should remain bagged and stored below 40°C
and 60%RH. If the parts are removed from the bag, they
should be used within 48 hours or stored in an environ-
ment at or below 20%RH. If the above conditions cannot
be followed, the parts should be baked for four hours at
125°C in order remove moisture prior to soldering. Zywyn
ships product in Dry Vapor Barrier Bags with a humidity
indicator card and desiccant pack. The humidity indicator
should be below 30%RH.
The information furnished by Zywyn has been carefully
reviewed for accuracy and reliability. Its application or
use, however, is solely the responsibility of the user. No
responsibility of the use of this information become part of
the terms and conditions of any subsequent sales agree-
ment with Zywyn. Specifications are subject to change
without the responsibility for any infringement of patents
or other rights of third parties which may result from its
use. No license or proprietary rights are granted by impli-
cation or otherwise under any patent or patent rights of
Zywyn Corporation.
Zywyn
Specifications subject to change without notice
2
August 2004
rev.1.2
Zywyn Corporation
DC Electrical Characteristics
Unless otherwise stated, V
CC
= +5.0V, T
A
= T
min
to T
max
, typical values apply at V
CC
= +5.0V and T
A
= 25°C.
Parameter
TTL Logic Input
TTL Logic Output
RS485 Input
RS485 Output
Power Pin
Temp 0°C to +70°C
Temp –40°C to +85°C
V
CC
Voltage Range
Supply Current
I
CC
, Tx and Rx active
I
CC
, Tx active
I
CC
, Rx active
I
SD
, Shutdown Current
TTL LOGIC Input
Input Threshold Low
Input Threshold High
TTL LOGIC Output
Output Voltage Low
Output Voltage High
Output Leakage Current
Short Circuit Current
Receiver Input
Input Current
DE = 0V, V
CC
= 0V to 5.25V, V
IN
= +12V
DE = 0V, V
CC
= 0V to 5.25V, V
IN
= –7V
–0.2
20
12
V
CM
= 0V
V
CM
= -7V to +12V
No Load
2
1.5
I
OUT
= +4mA, Input Differential Voltage = 200mV
I
OUT
= –4mA, Input Differential Voltage = 200mV
Receiver Outputs Disabled, V
OUT
= 0.4V to 2.4V
V
OUT
= 0V to V
CC
7
3.5
V
CC
= +5.0V Supply, DE, DI, and RE
V
CC
= +5.0V Supply, DE, DI, and RE
2.0
DI=V
CC
/GND, DE=V
CC
, RE=GND, RS485 I/P=Open
DI=V
CC
/GND, DE=V
CC
, RE=V
CC
, RS485 I/P=Open
DI=V
CC
/GND, DE=GND, RE=GND, RS485 I/P=Open
DI=V
CC
/GND, DE = GND, RE = V
CC,
RS485 I/P=Open
400
400
400
1.0
Condition
DE, DI, RE
RO
A, B
Y, Z
V
CC
, V
GND
Commercial Grade
Industrial Grade
V
CC
= +5.0V Supply
Min
Typ
ZT4xxE
Max
Units
High Z
O/P
when disabled
High Z
O/P
when disabled
0
–40
4.75
+25
+25
5.0
+70
+85
5.25
900
900
900
10
°C
°C
V
µA
µA
µA
µA
0.8
V
V
0.4
±1
95
1.0
–0.8
+0.2
V
V
µA
mA
mA
mA
V
mV
kΩ
DIfferentialThresholdVoltage,V
TH
V
CM
= 0V, V
CC
=+5.0V, T
A
=25
o
C
Input Hysteresis
Input Resistance, R
IN
Transmitter Output
DIfferentialOutputVoltage,V
OD
5
5
3
0.2
0.2
250
250
V
V
V
V
V
V
mA
mA
DIfferentialOutputVoltage,dV
OD
With R
L
= 50Ω, C
L
= 50pF, Refers to figure 1. (RS422)
With R
L
= 27Ω, C
L
= 50pF, Refers to figure 1. (RS485)
DriverCommonModeOutput
ChangeinVoltageMagnitude
forComplimentaryStates,dV
OC
ChangeinVoltageMagnitude
forComplimentaryStates,V
OC
TransmitterShort-CircuitCurrent
With R
L
= 27Ω or 50Ω. C
L
= 50pF. Refers to figure 3.
Differential Output Voltage, with R
L
= 27Ω or 50Ω, C
L
= 50pF.
Refers to figure 1.
Common-Mode Output Voltage, with R
L
= 60Ω,375Ω,375Ω.
Refers to figure 2.
Output HIGH, V
OUT
= -7V to +12V. Refers to figure 7.
Output LOW, V
OUT
= -7V to +12V. Refers to figure 7.
Zywyn
3
Specifications subject to change without notice
August 2004
rev.1.2
Zywyn Corporation
AC Electrical Characteristics (ZT485E, ZT490E, and ZT491E)
Unless otherwise stated, V
CC
= +5.0V, T
A
= T
min
to T
max
, typical values apply at V
CC
= +5.0V and T
A
= 25°C.
Parameter
Transmitter Timing
Transmitter Propagation t
PLH
Transmitter Propagation t
PHL
Transmitter Output Skew t
SK
Transmitter Rise/Fall Time
Transmitter Output Enable
Transmitter Output Disable
Receiver Timing
Receiver Propagation t
PLH
Receiver Propagation t
PHL
Differential Receiver Skew t
SK
Receiver Output Enable
Receiver Output Disable
Transceiver Throughput
Maximum Data Rate
ESD Tolerance
ESD HBM
RS485 Inputs and Outputs
±15
R
L
= 54Ω, C
L
= 50pF, T
A
= 25°C
10
C
L
= 15pF, Refers to figure 9.
C
L
= 15pF, Refers to figure 9.
|
t
PHL
- t
PLH
|
To Output HIGH, C
L
= 15pF. Refers to figure 10.
To Output LOW, C
L
= 15pF. Refers to figure 11.
From Output HIGH, C
L
= 15pF. Refers to figure 10.
From Output LOW, C
L
= 15pF. Refers to figure 11.
50
50
10
50
50
50
50
150
150
R
DIFF
= 54Ω, C
L
= 50pF. Refers to figure 4.
R
DIFF
= 54Ω, C
L
= 50pF. Refers to figure 4.
|
t
PLH
- t
PHL
|
t
r
, t
f
, R
DIFF
= 54Ω, C
L
= 50pF, ZT485E. Refers to figure 4.
t
r
, t
f
, R
DIFF
= 54Ω, C
L
= 50pF, ZT490E and ZT491E, refer fig.4.
To Output HIGH, C
L
= 50pF, R
L
= 110Ω. Refers to figure 5.
To Output LOW, C
L
= 50pF, R
L
= 110Ω. Refers to figure 6.
From Output HIGH, C
L
= 50pF, R
L
= 110Ω. Refers to figure 5.
From Output LOW, C
L
= 50pF, R
L
= 110Ω. Refers to figure 6.
35
35
3
15
15
50
50
50
50
60
60
10
25
25
Condition
Min
Typ
Max
ZT4xxE
Units
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
ns
Mbps
kV
Zywyn
Specifications subject to change without notice
4
August 2004
rev.1.2
Zywyn Corporation
AC Electrical Characteristics (ZT483E, ZT488E, and ZT489E)
Unless otherwise stated, V
CC
= +5.0V, T
A
= T
min
to T
max
, typical values apply at V
CC
= +5.0V and T
A
= 25°C.
Parameter
Transmitter Timing
Transmitter Propagation t
PLH
Transmitter Propagation t
PHL
Transmitter Output Skew t
SK
Transmitter Rise/Fall Time
Transmitter Output Enable
Transmitter Output Disable
Receiver Timing
Receiver Propagation t
PLH
Receiver Propagation t
PHL
Differential Receiver Skew t
SK
Receiver Output Enable
Receiver Output Disable
Shutdown Timing
Time to Shutdown, t
SHDN
Transmitter Enable from
SHUTDOWN to Output HIGH
Transmitter Enable from
SHUTDOWN to Output LOW
Receiver Enable from
SHUTDOWN to Output HIGH
Receiver Enable from
SHUTDOWN to Output LOW
Transceiver Throughput
Maximum Data Rate
ESD Tolerance
ESD HBM
RS485 Inputs and Outputs
±15
R
L
= 54Ω, C
L
= 50pF, T
A
= 25°C.
0.25
ZT483E
C
L
= 50pF, R
L
= 110Ω. Refers to figure 5.
C
L
= 50pF, R
L
= 110Ω. Refers to figure 6.
C
L
= 15pF, R
L
= 1kΩ. Refers to figure 12.
C
L
= 15pF, R
L
= 1kΩ. Refers to figure 12.
50
200
200
200
200
200
C
L
= 15pF, Refers to figure 9.
C
L
= 15pF, Refers to figure 9.
|
t
PHL
- t
PLH
|
To Output HIGH, C
L
= 15pF, Refers to figure 10.
To Output LOW, C
L
= 15pF, Refers to figure 11.
From Output HIGH, C
L
= 15pF, Refers to figure 10.
From Output LOW, C
L
= 15pF, Refers to figure 11.
250
250
10
100
100
100
100
R
DIFF
= 54Ω, C
L
= 50pF. Refers to figure 4.
R
DIFF
= 54Ω, C
L
= 50pF. Refers to figure 4.
|
t
PLH
- t
PHL
|
t
r
, t
f
, R
DIFF
= 54Ω, C
L
= 50pF, Refers to figure 4.
To Output HIGH, C
L
= 50pF, R
L
= 110Ω. Refers to figure 5.
To Output LOW, C
L
= 50pF, R
L
= 110Ω. Refers to figure 6.
From Output HIGH, C
L
= 15pF, R
L
= 110Ω. Refers to figure 5.
From Output LOW, C
L
= 15pF, R
L
= 110Ω. Refers to figure 6.
250
250
250
100
100
100
100
800
800
20
Condition
Min
Typ
ZT4xxE
Max
Units
2000
2000
800
2000
ns
ns
ns
ns
ns
ns
ns
ns
2000
2000
ns
ns
ns
ns
ns
ns
ns
600
ns
ns
ns
ns
ns
Mbps
kV
Zywyn
5
Specifications subject to change without notice
August 2004
rev.1.2
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