Datasheet
A
DI+
D
Driver ENABLED
R
L
/2
C
L
B
C
L
C
L
R
L
/2
V
OS
V
AB
Power Supply
Power Supply
DI-
DS91M125
www.ti.com
SNLS290C –AUGUST 2008–REVISED APRIL 2013
SWITCHING CHARACTERISTICS
Over recommended operating supply and temperature ranges unless otherwise specified.
(1) (2) (3)
Symbol Parameter Conditions Min Typ Max Units
DRIVER AC SPECIFICATION
t
PLH
Differential Propagation Delay Low to High R
L
= 50Ω, C
L
= 5 pF, 3.0 5.5 8.5 ns
t
PHL
Differential Propagation Delay High to Low C
D
= 0.5 pF 3.0 5.5 8.5 ns
t
SKD1
(t
sk(p)
) Pulse Skew |t
PLHD
− t
PHLD
|
(4)(5)
See Figure 7 and Figure 8 65 350 ps
t
SKD2
Channel-to-Channel Skew
(6)(5)
65 400 ps
t
SKD3
Part-to-Part Skew
(7)(5)
2.2 2.5 ns
t
SKD4
Part-to-Part Skew
(8)
5.5 ns
t
TLH
(t
r
) Rise Time
(5)
1.1 2.0 3.0 ns
t
THL
(t
f
) Fall Time
(5)
1.1 2.0 3.0 ns
t
PZH
Enable Time (Z to Active High) R
L
= 50Ω, C
L
= 5 pF, 6 11 ns
t
PZL
Enable Time (Z to Active Low ) C
D
= 0.5 pF 6 11 ns
t
PLZ
Disable Time (Active Low to Z) See Figure 9 and Figure 10 6 11 ns
t
PHZ
Disable Time (Active High to Z) 6 11 ns
f
MAX
Maximum Operating Frequency
(5)
125 MHz
(1) The ELECTRICAL CHARACTERISTICS tables list ensured specifications under the listed Recommended Operating Conditions except
as otherwise modified or specified by the Electrical Characteristics Conditions and/or Notes.
(2) Typical values represent most likely parametric norms for V
DD
= +3.3V and T
A
= +25°C, and at the Recommended Operation Conditions
at the time of product characterization and are not ensured.
(3) C
L
includes fixture capacitance and C
D
includes probe capacitance.
(4) t
SKD1
, |t
PLHD
− t
PHLD
|, is the magnitude difference in differential propagation delay time between the positive going edge and the negative
going edge of the same channel.
(5) Specification is ensured by characterization and is not tested in production.
(6) t
SKD2
, Channel-to-Channel Skew, is the difference in propagation delay (t
PLHD
or t
PHLD
) among all output channels.
(7) t
SKD3
, Part-to-Part Skew, is defined as the difference between the minimum and maximum specified differential propagation delays. This
specification applies to devices at the same V
DD
and within 5°C of each other within the operating temperature range.
(8) t
SKD4
, Part-to-Part Skew, is the differential channel-to-channel skew of any event between devices. This specification applies to devices
over recommended operating temperature and voltage ranges, and across process distribution. t
SKD4
is defined as |Max − Min|
differential propagation delay.
TEST CIRCUITS AND WAVEFORMS
Figure 2. Differential Driver Test Circuit
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