stcd2400 STMicroelectronics, stcd2400 Datasheet - Page 13

• Manufacturer Part Number: stcd2400
• Description: Multichannel Clock Distribution Circuit
• Manufacturer: STMicroelectronics

STCD22x0, STCD23x0, STCD24x0
Note:
3.2
Table 6.
"0" means logic low and "1" means logic high. When there is NO CLOCK output, the CLKx
pin stays at logic low. "X" means don't care. This is an active high truth table. Refer to
Section 3.2: Enable polarity
Enable polarity
In different applications, the user may have different requirements for enable active high or
active low (enable polarities). MC
solutions for the user to obtain different enable polarities.
In the STCD22x0 and STCD24x0, the user can configure the enable active high or active
low on the PC board by connecting OPT1 and OPT2 to either V
Table 7
In the STCD23x0, STMicroelectronics offers 4 enable polarity options by factory
programming for the user. Refer to
The user should note that OPT1 and OPT2 must be connected to either V
PC board and floating on these pins could cause problems.
Table 7.
Part number
EN1
STCD2200
STCD2400
STCD2410
STCD2300
STCD2310
STCD2320
STCD2330
0
1
1
1
-
for detailed information.
EN2
0
0
1
1
-
Truth table for enable signals (EN1-4), master clock input (MCLK) and
output clocks (CLK1-4)
STCD22x0, STCD23x0 and STCD24x0 and enable polarity options
EN3
OPT1 connected to V
OPT1 connected to GND, EN1 active low
OPT2 controls EN2
OPT1 connected to V
OPT1 connected to GND, EN1 and EN2 active low
OPT2 controls EN3 and EN4
OPT1 connected to V
OPT1 connected to GND, EN1 active low
OPT2 controls EN2, EN3, and EN4
EN1, EN2 and EN3 all active low
EN1, EN2 active low, and EN3 active high
EN1, EN2 active high and EN3 active low
EN1, EN2 and EN3 all active high
0
0
0
1
-
EN4
0
0
0
1
-
for the detailed enable active high/low options.
Enable polarities (OPT1, OPT2)
CLOCK
CLOCK
CLOCK
MCLK
Doc ID 15400 Rev 2
X
-
REQ
Table 7
CC
CC
CC
is active low. STMicroelectronics offers different
, EN1 active high
, EN1 and EN2 active high
, EN1 active high
NO CLOCK
CLOCK
CLOCK
CLOCK
CLK1
for detailed information.
-
NO CLOCK
NO CLOCK
CLOCK
CLOCK
CLK2
-
CC
NO CLOCK
NO CLOCK
NO CLOCK
or ground. Refer to
CLOCK
CLK3
-
Device operation
CC
program method
Factory program
Enable polarity
User program
or GND on the
NO CLOCK
NO CLOCK
NO CLOCK
CLOCK
CLK4
-
13/39