Zywyn Corporation
ZT4xxER
ACElectricalCharacteristics(ZT485ER,ZT490ER,andZT491ER)
Unless otherwise stated, VCC = +5.0V, TA = Tmin to Tmax, typical values apply at VCC = +5.0V and TA = 25°C.
Parameter
Condition
Min
Typ
Max
Units
Transmitter Timing
Transmitter Propagation tPLH RDIFF = 54Ω, CL = 50pF. Refers to figure 4.
Transmitter Propagation tPHL RDIFF = 54Ω, CL = 50pF. Refers to figure 4.
35
35
3
60
60
10
ns
ns
ns
Transmitter Output Skew tSK |tPLH - tPHL
|
Transmitter Rise/Fall Time
Transmitter Output Enable
Transmitter Output Disable
tr, tf , RDIFF = 54Ω, CL = 50pF, ZT485ER. Refers to figure 4.
tr, tf , RDIFF = 54Ω, CL = 50pF, ZT490ER and ZT491ER, fig.4.
15
15
25
25
ns
ns
To Output HIGH, CL = 50pF, RL = 110Ω. Refers to figure 5.
To Output LOW, CL = 50pF, RL = 110Ω. Refers to figure 6.
50
50
ns
ns
From Output HIGH, CL = 50pF, RL = 110Ω. Refers to figure 5.
From Output LOW, CL = 50pF, RL = 110Ω. Refers to figure 6.
50
50
ns
ns
Receiver Timing
Receiver Propagation tPLH
Receiver Propagation tPHL
Differential Receiver Skew tSK
Receiver Output Enable
CL = 15pF, Refers to figure 9.
CL = 15pF, Refers to figure 9.
50
50
10
150
150
ns
ns
ns
|tPHL - tPLH
|
To Output HIGH, CL = 15pF. Refers to figure 10.
To Output LOW, CL = 15pF. Refers to figure 11.
50
50
ns
ns
Receiver Output Disable
From Output HIGH, CL = 15pF. Refers to figure 10.
From Output LOW, CL = 15pF. Refers to figure 11.
50
50
ns
ns
Transceiver Throughput
Maximum Data Rate
RL = 54Ω, CL = 50pF, TA = 25°C
10
Mbps
kV
ESDTolerance
ESD HBM
RS485 Inputs and Outputs
±15
Specifications subject to change without notice
Zywyn
4
February2005
rev.1.2
ASIX [ ASIX ELECTRONICS CORPORATION ]
