Datasheet

DS89C21
SNLS091C –JUNE 1998–REVISED APRIL 2013 www.ti.com
Switching Characteristics
(1)(2)
Over recommended supply voltage and operating temperature ranges, unless otherwise specified.
Symbol Parameter Conditions Min Typ Max Units
DIFFERENTIAL DRIVER CHARACTERISTICS
t
PLHD
Propagation Delay LOW to HIGH R
L
= 100Ω (Figure 2 Figure 3) 2 4.9 10 ns
t
PHLD
Propagation Delay HIGH to LOW C
L
= 50 pF 2 4.5 10 ns
t
SKD
Skew, |t
PLHD
–t
PHLD
| 0.4 2.0 ns
t
TLH
Transition Time LOW to HIGH (Figure 2 Figure 4) 2.2 9 ns
t
THL
Transition Time HIGH to LOW 2.1 9 ns
RECEIVER CHARACTERISTICS
t
PLH
Propagation Delay LOW to HIGH C
L
= 50 pF (Figure 5 Figure 6) 6 18 30 ns
t
PHL
Propagation Delay HIGH to LOW V
DIFF
= 2.5V 6 17.5 30 ns
t
SK
Skew, |t
PLH
–t
PHL
| V
CM
= 0V 0.5 4.0 ns
t
r
Rise Time (Figure 7) 2.5 9 ns
t
f
Fall Time 2.1 9 ns
(1) All typicals are given for V
CC
= 5.0V and T
A
= 25°C.
(2) f = 1 MHz, t
r
and t
f
≤ 6 ns.
Parameter Measurement Information
Figure 1. V
OD
and V
OC
Test Circuit
f = 1 MHz, tr and tf ≤ 6 ns.
Figure 2. Driver Propagation Delay Test Circuit
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