DS89C21_14 Datasheet, PDF (4/13 Pages) Texas Instruments – Differential CMOS Line Driver and Receiver Pair

DS89C21
SNLS091C – JUNE 1998 – REVISED APRIL 2013
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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
t_PHLD
Propagation Delay HIGH to LOW
t_SKD
Skew, |t_PLHD–t _PHLD|
t_TLH
Transition Time LOW to HIGH
t_THL
Transition Time HIGH to LOW
RECEIVER CHARACTERISTICS
R_L = 100Ω
C_L = 50 pF
(Figure 2 Figure 3)
(Figure 2 Figure 4)
2
4.9
10
ns
2
4.5
10
ns
0.4
2.0
ns
2.2
9
ns
2.1
9
ns
t_PLH
Propagation Delay LOW to HIGH
C_L = 50 pF
(Figure 5 Figure 6)
t_PHL
Propagation Delay HIGH to LOW
V_DIFF = 2.5V
t_SK
Skew, |t_PLH–t _PHL|
V_CM = 0V
t_r
Rise Time
(Figure 7)
t_f
Fall Time
6
18
30
ns
6 17.5 30
ns
0.5
4.0
ns
2.5
9
ns
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
4
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