SP483_17 Datasheet, PDF (6/13 Pages) Exar Corporation – Low Power Half-Duplex RS-485 Transceivers

T_MIN to T_MAX and V_CC = 5V +/-5% unless otherwise noted.
PARAMETERS
MIN.
TYP.
ELECTRICAL CHARACTERISTICS
MAX. UNITS CONDITIONS
SP483 DRIVER
AC Characteristics
Maximum Date Rate
250
kbps
Driver Input to Output, t_PLH
250
800
2000
ns
t_PLH; R_DIFF = 54Ω, C_L1 = C_L2 = 100pF,
see figures 3 and 5
Driver Input to Output, t_PHL
250
800
2000
ns
t_PHL; R_DIFF = 54Ω, C_L1 = C_L2 = 100pF,
see figures 3 and 5
Driver Skew
Driver Rise or Fall Time
100
800
250
2000
ns see figures 3 and 5,
t_SKEW = |t_DPHL - t_DPLH|
ns
From 10%-90%; R_DIFF = 54Ω
C_L1 = C_L2 = 100pF; see Figures 3
and 5
Driver Enable to Output High
250
Driver Enable to Output Low
250
Driver Disable Time from High 300
Driver Disable Time from Low
300
SP483 RECEIVER
AC Characteristics
Maximum Data Rate
250
2000
2000
3000
3000
ns C_L = 100pF, see figures 4 and 6,
S₂ closed
ns C_L = 100pF, see figures 4 and 6,
S₁ closed
ns C_L = 15pF, see figures 4 and 6,
S₂ closed
ns C_L = 15pF, see figures 4 and 6,
S₁ closed
kbps
Receiver Input to Output
250
2000
Differential Receiver Skew
|t_PHL - t_PLH|
Receiver Enable to Output Low
100
20
50
Receiver Enable to Output High
20
50
Receiver Disable from LOW
20
50
Receiver Disable from High
20
50
SP483
Shutdown Timing
Time to Shutdown
50
200
600
ns
t_PLH, t_PHL; Figures 3 and 7:
R_DIFF = 54Ω, C_L1 = C_L2 = 100pF
ns
R_DIFF = 54Ω, C_L1 = C_L2 = 100pF,
see Figures 3 and 7
ns C_RL = 15pF, Figures 2 and 8;
S₁ Closed
ns C_RL = 15pF, Figures 2 and 8;
S₂ Closed
ns C_RL = 15pF, Figures 2 and 8;
S₁ Closed
ns C_RL = 15pF, Figures 2 and 8;
S₂ Closed
ns RE = 5V, DE = 0V
Driver Enable from Shutdown
to Output High
Driver Enable from Shutdown
to Output Low
Receiver Enable from
Shutdown to Output High
Receiver Enable from
Shutdown to Output Low
2000
2000
2500
2500
ns C_L = 100pF; See Figures 4 and 6;
S₂ Closed
ns C_L = 100pF; See Figures 4 and 6;
S₁ Closed
ns C_L = 15pF; See Figures 4 and 6;
S₂ Closed
ns C_L = 15pF; See Figures 4 and 6;
S₁ Closed
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com
SP483_SP485_101_062711