Corporation
SP306 RS-422/RS-423 Line Drivers/Receivers
SIGNAL PROCESSING EXCELLENCE
s Single chip serial transceiver ...
Corporation
SP306 RS-422/RS-423 Line Drivers/Receivers
SIGNAL PROCESSING EXCELLENCE
s Single chip serial transceiver supports RS-422 or RS-423 interfaces s Programmable Selection of Interface s Two Full–Duplex Channels of Either Interface s Software–Selectable Mode s Loopback for Self–Testing s Short–Circuit Protected s Surface Mount Packaging
DESCRIPTION… The SP306 is a single chip device that offers both RS-422 and RS-423–type serial interfaces. The device can be programmed to provide two full–duplex channels of either RS-422 or RS-423 via two mode control pins. The SP306 also features a loopback function that can be activated in any operating mode. The SP306 is available in a 28–pin SOIC package for operation over the commercial temperature range.
SUPPLY +5V +12V –12V
28 1 15 VCC VDD VEE 7 8 22 SELECT A SELECT B LOOPBACK 6 T1 5 9 T2 SP306 ROUTA 26 R1 10 2 3
TINA
23
TOUTA1 TOUTA2 TOUTB1 TOUTB2 RINA2 RINA1
TINB
20
ROUTB
17 14
13 R2 GND 12
RINB2 RINB1
Corporation
89
SIGNAL PROCESSING EXCELLENCE
SPECIFICATIONS
(TMIN ≤T A ≤T MAX and nominal supply
voltages unless otherwise noted)
PARAMETER RS-423 DRIVER TTL Input Level VIL VIH High Level Output Low Level Output
MIN.
TYP.
MAX.
UNIT
CONDITIONS
0 2.0 +3.0 –3.0 720
0.8 +6.0 (VDD – 0.7V) –6.0 (VEE +0.7V) ±40
±6.0 Short Circuit Current ±100 Output Current ±500 Transition Time 400 Maximum Transmission Rate 500 RS-422 RECEIVER Common Mode Range ±7 Differential Input ±15 Differential Input Threshold –0.2 +0.2 ...
