SP1481E Datasheet, PDF (4/10 Pages) Sipex Corporation – ±15kV Enhanced Low Power Half-Duplex RS-485 Transceivers

RO 1
R
8 V_CC
RE 2
7B
DE 3
6A
D
DI 4
SP485 ^{5 GND}
Top View
SP1481E and SP1485E
Pinout (Top View)
A
R
V_OD
B
R ^VOC
Figure 1. RS-485 Driver DC Test Load Circuit
3V
DE
C_L1
DI
A _RDIFF
B
C_L2
A
RO
B
15pF
Figure 3. RS-485 Driver/Receiver Timing Test Circuit
Pin function
Pin 1 – RO – Receiver Output.
Pin 2 – RE – Receiver Output Enable Active LOW.
Pin 3 – DE – Driver Output Enable Active HIGH.
Pin 4 – DI – Driver Input.
Pin 5 – GND – Ground Connection.
Pin 6 – A – Driver Output/Receiver Input Non-inverting.
Pin 7 – B – Driver Output/Receiver Input Inverting.
Pin 8 – Vcc – Positive Supply 4.75V<Vcc< 5.25V.
Receiver
Output
Test Point
1K
S₁
V_CC
C_RL
1K
S₂
Figure 2. Receiver Timing Test Load Circuit
Output
500
Under
Test _CL
S₁ ^VCC
S₂
Figure 4. RS-485 Driver Timing Test Load #2 Circuit
+3V
DI
0V
f = 1MHz; t_R < 1ns; t_F < 1ns
1.5V
t_PLH
t_PHL
DRIVER ^B
OUTPUT _A
DIFFERENTIAL V_O⁺
OUTPUT
V_A – V_B
0V
V_O^–
V_O ^1/2VO
t_SKEW
t_R
Figure 5. Driver Propagation Delays
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7017 • www.exar.com

1.5V
t_PLH
1/2V_O
t_SKEW
t_F
SP1481E-1485E_100_061609