Datasheet

Switching Characteristics
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified (Notes 4, 8, 9)
Symbol Parameter Conditions Min Typ Max Units
t
PLHD
Driver Differential Propagation Delay —Low to High R
L
=54Ω,C
L
= 100 pF 10 40 80 ns
t
PHLD
Driver Differential Propagation Delay —High to Low 10 39 80 ns
t
SKEW
Differential Skew |t
PHLD
−t
PLHD
|0110ns
t
r
Driver Rise Time 32550 ns
t
f
Driver Fall Time 32550 ns
t
ZH
Driver Enable to Output High C
L
= 100 pF 50 200 ns
t
ZL
Driver Enable to Output Low C
L
= 100 pF 65 200 ns
t
LZ
Driver Disable from Output Low C
L
= 15 pF 80 200 ns
t
HZ
Driver Disable from Output High C
L
= 15 pF 80 200 ns
t
PLHD
Receiver Differential Propagation Delay —Low to High C
L
= 15 pF (RO) 30 190 400 ns
t
PHLD
Receiver Differential Propagation Delay —High to Low 30 210 400 ns
t
SKEW
Differential Skew |t
PHLD
−t
PLHD
| 0 20 50 ns
t
ZH
Receiver Enable to Output High C
L
= 15 pF 45 150 ns
t
ZL
Receiver Enable to Output Low 40 150 ns
t
LZ
Receiver Disable from Output Low 50 150 ns
t
HZ
Receiver Disable from Output High 55 150 ns
f
max
Maximum Data Rate (Note 10) 2.0 Mbps
Note 2: “Absolute Maximum Ratings” are those values beyond which the safety of the device cannot be guaranteed. They are not meant to imply that the devices
should be operated at these limits. The table of “Electrical Characteristics” specifies conditions of device operation.
Note 3: Current into device pins is defined as positive. Current out of device pins is defined as negative. All voltages are referenced to ground except V
OD1/2/3
and
V
ID
.
Note 4: All typicals are given for: V
CC
= +5.0V, T
A
= +25˚C.
Note 5: ∆|V
OD
| and ∆|V
OC
| are changes in magnitude of V
OD
and V
OC
respectively, that occur when the input changes state.
Note 6: I
IN2
includes the receiver input current and driver TRI-STATE leakage current.
Note 7: Supply current specification is valid for loaded transmitters when DE = 0V or enabled (DE = H) with no load.
Note 8: f = 1 MHz, t
r
and t
f
≤ 6 ns, Z
O
=50Ω.
Note 9: C
L
includes jig and probe capacitance.
Note 10: f
max
is the guaranteed data rate for 50 ft of twisted pair cable. f
max
may be conservatively determined from the ratio of driver transition time (t
r
) to the data
rate unit interval (1/f
max
). Using a 10% ratio yields f
max
= (0.1)/50 ns = 2.0 Mb/s. Higher data rates may be supported by allowing larger ratios.
Parameter Measurement Information
DS012920-2
FIGURE 1. V
OD
DS012920-3
FIGURE 2. V
OD3
DS012920-4
FIGURE 3.
DS1487
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