SP3485 Datasheet, PDF (4/9 Pages) Exar Corporation – +3.3V Low Power Half-Duplex RS-485 Transceiver

T_AMB = T_MIN to T_MAX and V_CC = +3.3V +/-5% unless otherwise noted.
ELECTRICAL CHARACTERISTICS
PARAMETERS
MIN.
TYP.
MAX. UNITS CONDITIONS
Receiver Enable from
Shutdown to Output High, t_PRSH
Receiver Enable from
Shutdown to Output Low, t_PRSL
Time to Shutdown, t_SHDN
50
POWER REQUIREMENTS
1800
1800
ns C_L = 15pF, R_L = 1kΩ.
Figures 7 and 13
ns
200
600
ns Notes 1 and 2
Supply Current , No Load
425
2000
µA RE, DI = 0V or V_CC ; DE = V_CC
Supply Current , No Load
300
1500
µA RE = 0V, DI = 0V or V_CC, DE = 0V
Notes:
1. The transceivers are put into shutdown by bringing RE High and DE Low simultaneously for at least 600ns. If the control inputs are in this state
for less than 50ns, the device is guaranteed to not enter shutdown. If the enable inputs are held in this state for at least 600ns the device is
assured to be in shutdown. Note that the receiver and driver enable times increase significantly when coming out of shutdown.
2. This spec is guaranteed by design and bench characterization.
PIN FUNCTION
Pin Function SP3485
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 - Non-Inverting Driver Output/Receiver Input
Pin 7 - B - Inverting Driver Output/Receiver Input
Pin 8 - Vcc - Positive Supply
Exar Corporation 48720 Kato Road, Fremont CA, 94538 • 510-668-7000 • www.exar.com
4
SP3485_200_051916