4
August 2004
rev.1.2
Zywyn
Specifications subject to change without notice
Zywyn Corporation
ZT4xxE
ACElectrical Characteristics (ZT485E, ZT490E, and ZT491E)
Unless otherwise stated, V
CC = +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 t
PLH
R
DIFF = 54Ω, CL = 50pF. Refers to figure 4.
35
60
n s
Transmitter Propagation t
PHL
R
DIFF = 54Ω, CL = 50pF. Refers to figure 4.
35
60
n s
Transmitter Output Skew t
SK
|||||t
PLH - tPHL|||||
310
n s
Transmitter Rise/Fall Time
t
r, tf , RDIFF = 54Ω, CL = 50pF, ZT485E. Refers to figure 4.
15
25
n s
t
r, tf , RDIFF = 54Ω, CL = 50pF, ZT490E and ZT491E, refer fig.4.
15
25
n s
Transmitter Output Enable
To Output HIGH, C
L = 50pF, RL = 110Ω. Refers to figure 5.
50
n s
To Output LOW, C
L = 50pF, RL = 110Ω. Refers to figure 6.
50
n s
Transmitter Output Disable
From Output HIGH, C
L = 50pF, RL = 110Ω. Refers to figure 5.
50
n s
From Output LOW, C
L = 50pF, RL = 110Ω. Refers to figure 6.
50
n s
Receiver Timing
Receiver Propagation t
PLH
C
L = 15pF, Refers to figure 9.
50
150
n s
Receiver Propagation t
PHL
C
L = 15pF, Refers to figure 9.
50
150
n s
Differential Receiver Skew t
SK
|||||t
PHL - tPLH|||||
10
n s
Receiver Output Enable
To Output HIGH, C
L = 15pF. Refers to figure 10.
50
n s
To Output LOW, C
L = 15pF. Refers to figure 11.
50
n s
Receiver Output Disable
From Output HIGH, C
L = 15pF. Refers to figure 10.
50
n s
From Output LOW, C
L = 15pF. Refers to figure 11.
50
n s
Transceiver Throughput
Maximum Data Rate
R
L = 54Ω, CL = 50pF, TA = 25°C
10
Mbps
ESD Tolerance
ESD HBM
RS485 Inputs and Outputs
±15
kV