DS485_15 Datasheet, PDF (4/16 Pages) Texas Instruments – Low Power RS-485/RS-422 Multipoint Transceiver

DS485
SNLS122C – JULY 1998 – REVISED APRIL 2013
SWITCHING CHARACTERISTICS
Over Supply Voltage and Operating Temperature Ranges, unless otherwise specified^(1)(2)(3)
Symbol
Parameter
Conditions
t_PLHD
t_PHLD
t_SKEW
t_r
t_f
t_ZH
t_ZL
t_LZ
t_HZ
t_PLHD
t_PHLD
t_SKEW
t_ZH
t_ZL
t_LZ
t_HZ
f_max
Driver Differential Propagation Delay—Low to High
Driver Differential Propagation Delay—High to Low
Differential Skew |t_PHLD − t_PLHD|
Driver Rise Time
Driver Fall Time
Driver Enable to Output High
Driver Enable to Output Low
Driver Disable from Output Low
Driver Disable from Output High
Receiver Differential Propagation Delay—Low to High
Receiver Differential Propagation Delay—High to Low
Differential Skew |t_PHLD − t_PLHD|
Receiver Enable to Output High
Receiver Enable to Output Low
Receiver Disable from Output Low
Receiver Disable from Output High
Maximum Data Rate
R_L = 54Ω, C_L = 100 pF
C_L = 100 pF
C_L = 100 pF
C_L = 15 pF
C_L = 15 pF
C_L = 15 pF (RO)
C_L = 15 pF
See ⁽⁴⁾
www.ti.com
Min Typ Max Units
10 40 65
ns
10 39 65
ns
1 10
ns
3 25 40
ns
3 25 40
ns
170 ns
170 ns
170 ns
170 ns
70 190 320 ns
70 210 320 ns
20 50
ns
110 ns
110 ns
110 ns
110 ns
2.5
Mbps
(1) All typicals are given for: V_CC = +5.0V, T_A = +25°C.
(2) f = 1 MHz, t_r and t_f ≤ 6 ns, Z_O = 50Ω.
(3) C_L includes jig and probe capacitance.
(4) f_max is the ensured 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)/40 ns = 2.5 Mb/s. Higher data rates may be supported by
allowing larger ratios.
4
Submit Documentation Feedback
Product Folder Links: DS485
Copyright © 1998–2013, Texas Instruments Incorporated