2:1 Multiplexers and 1:2 Demultiplexers with
Loopback
Pin Description
PIN
NAME
FUNCTION
TQFP
QFN
1, 2, 28
3, 8, 18, 23
4
1, 2, 3, 30,
31, 32
N.C.
GND
ENB
No Connection. Not internally connected.
4, 9, 20, 25
Ground
Channel B Output Enable. Drive ENB high to enable the LVDS outputs for channel B.
An internal 435ꢀΩ resistor to GND pulls ENB low when unconnected.
5
Channel B LVDS Noninverting Output. Connect a 100Ω termination resistor between
OUTB and OUTB at the receiver inputs to ensure proper operation.
6
7
5
6
OUTB
Channel B LVDS Inverting Output. Connect a 100Ω termination resistor between
OUTB and OUTB at the receiver inputs to ensure proper operation.
OUTB
Power-Supply Input. Bypass each V
to GND with a 0.1µF and 0.01µF ceramic
CC
capacitor. Install both bypass capacitors as close to the device as possible, with the
0.01µF capacitor closest to the device.
8, 13, 24, 29
7, 22, 27
V
CC
LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Inverting Input. An internal
128ꢀΩ pullup resistor to V pulls the input high when unconnected (MAX9394). An
internal 68ꢀΩ resistor to GND pulls the input low when unconnected (MAX9395).
10
11
9
INB0
CC
LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Noninverting Input. An internal
10
INB0
128ꢀΩ pullup resistor to V pulls the input high when unconnected (MAX9394). An
CC
internal 68ꢀΩ resistor to GND pulls the input low when unconnected (MAX9395).
Loopbacꢀ Select for Channel B Output. Connect LB_SELB to GND or leave
unconnected to reproduce the INB_ (INB_) differential inputs at OUTB (OUTB).
12
11
LB_SELB
Connect LB_SELB to V
to loop bacꢀ the INA (INA) differential inputs to OUTB
CC
(OUTB). An internal 435ꢀΩ resistor to GND pulls LB_SELB low when unconnected.
LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Inverting Input. An internal
128ꢀΩ pullup resistor to V pulls the input high when unconnected (MAX9394). An
internal 68ꢀΩ resistor to GND pulls the input low when unconnected (MAX9395).
14
15
12
13
INB1
CC
LVDS/HSTL (MAX9394) or LVPECL/CML (MAX9395) Noninverting Input. An internal
INB1
128ꢀΩ pullup resistor to V pulls the input high when unconnected (MAX9394). An
CC
internal 68ꢀΩ resistor to GND pulls the input low when unconnected (MAX9395).
Channel B Multiplexer Control Input. Selects the differential input to reproduce at the
B channel differential output. Connect BSEL to GND or leave unconnected to select
16
14
BSEL
the INB0 (INB0) set of inputs. Connect BSEL to V
to select the INB1 (INB1) set of
CC
inputs. An internal 435ꢀΩ resistor to GND pulls BSEL low when unconnected.
Channel A1 Output Enable. Drive ENA1 high to enable the A1 LVDS outputs. An
internal 435ꢀΩ resistor to GND pulls the ENA1 low when unconnected.
17
18
19
15
16
17
ENA1
OUTA1
OUTA1
Channel A1 LVDS Inverting Output. Connect a 100Ω termination resistor between
OUTA1 and OUTA1 at the receiver inputs to ensure proper operation.
Channel A1 LVDS Noninverting Output. Connect a 100Ω termination resistor between
OUTA1 and OUTA1 at the receiver inputs to ensure proper operation.
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5