
XR-T3588/89
5
Rev. 1.05
PIN DESCRIPTION FOR XR-T3588 (CONT’D)
Pin #
Symbol
Type
Description
16
VREF1
O
Channel 1 Voltage Regulator. Provides 3.3V regulated supply for connection of channel 1
transmit termination network (see
Figure 6). If the driver is disabled, the voltage output at this
pin will be Vcc - 0.7V.
17
O/Pl B
O
Channel I Differential Output B. Open collector current output. Current sink capability 22mA
nominal (defined by Rbias). When terminated with network to VREF1 provides an output volt-
age in phase with I/P2. DC level with TX and RX termination +/-O.275V nominal.
18
O/Pl A
O
Channel 1 Differential Output A. Open collector current output. Current sink capability 22mA
nominal (defined by Rbias). When terminated with network to VREF2 provides an output voltage
with inverse phase to I/Pl. DC level with TX and RX termination +/-O.275V nominal.
PIN DESCRIPTION FOR XR-T3589
Pin #
Symbol
Type
Description
1
GND
Ground (0V).
2
SELA
I
Channel Enable Select A Input. TTL compatible input used in conjunction with SELB to
power down individual receiver channels. (see table 2).
3
SELB
I
Channel Enable Select B Input. TTL compatible input used in conjunction with SELA to
power down individual receiver channels (see table 2).
4
O/P1
O
Channel 1 Output. TTL compatible.
5
O/P2
O
Channel 2 Output. TTL compatible.
6
O/P3
O
Channel 3 Output. TTL compatible.
7
VEE
Negative Supply (-5V).
8
I/P3B
I
Channel 3 Differential Input B. Rin 4kL2 nominal. Should be terminated with an external
network to GND (see
Figure 8).
9
I/P3A
I
Channel 3 Differential Input A. Rin 4k.Q nominal. Should be terminated with an external
network to GND (see
Figure 8).
10
VP2B
I
Channel 2 Differential Input B. Rin 4kL2 nominal. Should be terminated with an external
network to GND (see
Figure 8).
11
I/P2A
I
Channel 2 Differential Input A. Rin 4kQ nominal. Should be terminated with an external
network to GND (see
Figure 8).
12
I/Pl B
I
Channel I Differential Input B. Rin 4k.Q nominal. Should be terminated with an external
network to GND (see
Figure 8).
13
I/PlA
I
Channel I Differential Input A. Rin 4k.Q nominal. Should be terminated with an external
network to GND (see
Figure 8).
14
VCC
Positive Supply (5V).