SP306 Datasheet, PDF (3/6 Pages) Sipex Corporation – RS-422/RS-423 Line Drivers/Receivers

Note:
1. The common mode voltage is defined as the algebraic mean of the two voltages appearing at the
receiver input terminals with respect to the receiver circuit ground.
2. Only one output drive pin per package will be shorted at any time.
3. From 10% to 90% of steady state.
4. This is an absolute maximum rating. Normal operating levels are V_IN ≤ 5V.
5. Outputs unloaded. Inputs tied to GND; T_A=+25°C; V_IL = 0V; LB = 0.
6. V_OL/V_OH will typically be ±3V over –55°C to +125°C with 450Ω loads.
PINOUT
V_DD 1
R_INA2 2
R_INA1 3
N.C. 4
T_OUTA2 5
T_OUTA1 6
SELECTA 7
SELECTB 8
T_OUTB1 9
T_OUTB2 10
N.C. 11
R_INB1 12
R_INB2 13
GND 14
SP306
28 V_CC
27 N.C.
26 R_OUTA
25 N.C.
24 N.C.
23 T_INA
22 LOOPBACK
21 N.C.
20 T_INB
19 N.C.
18 N.C.
17 R_OUTB
16 N.C.
15 V_EE
PIN ASSIGNMENTS
Pin 1 — V_DD — +12V Power Supply.
Pin 2 — R_INA2 — RS422 input.
Pin 3 — R_INA1 — RS422/RS423 input.
Pin 4 — N.C. — No Connection.
Pin 5 — T_OUTA2 —RS422 output.
Pin 6 — T_OUTA1 — RS422/RS423 output.
Pin 7 — SEL A — Select A; used with Select B
(pin 8) to select operating mode; please refer to
SP306 Control Logic Configuration section for
truth table.
Pin 8 — SEL B — Select B; used with Select A
(pin 7) to select operating mode; please refer to
SP306 Control Logic Configuration section for
truth table.
Pin 9— T_OUTB1— RS422/RS423 output.
Pin 10 — T_OUTB2 — RS422 output.
Pin 11 — N.C. — No Connection.
Pin 12— R_INB1— RS422/RS423 input.
Pin 13 — R_INB2— RS422 input
Pin 14 — GND — Signal ground. Connected to
logic and chasis ground.
Pin 15 — V_EE — –12V Power Supply.
Pin 16 — N.C. — No Connection.
Pin 17 — R_OUTB — TTL output.
Pin 18 — N.C. — No Connection.
Pin 19 — N.C. — No Connection.
Pin 20 — T_INB — TTL input.
Pin 21 — N.C. — No Connection.
Pin 22 — LOOPBACK — Active low; logic “1”
selects operating mode controlled by SELECT
A and SELECT B; logic “0” selects loopback
configuration for whatever operating mode is
selected by states of SELECT A and
SELECT B.
Pin 23 — T_INA — TTL input.
Pin 24 — N.C. — No Connection.
Pin 25 — N.C. — No Connection.
Pin 26 — R_OUTA — TTL output.
Pin 27 — N.C. — No Connection.
Pin 28 — V_CC — +5V Power Supply.
FEATURES…
The SP306 is a single chip device that offers
both RS-422 and RS-423 serial interfaces. The
device can be programmed via two control mode
pins (7 and 8). In either operating mode, the
SP306 provides two full–duplex channels. A
loopback function is also provided for chip self–
test, which connects driver outputs to receiver
inputs with no external circuitry.
The RS-422 drivers convert TTL logic levels
into RS-422 differential output signals. The
RS-422 line driver outputs feature high source
Corporation
SIGNAL PROCESSING EXCELLENCE
91