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MPC9893 REVISION 8 JANUARY 16, 2013
3
2013 Integrated Device Technology, Inc.
MPC9893 Data Sheet
3.3V 1:12 LVCMOS PLL CLOCK GENERATOR
Table 1. Pin Configurations
Number
Name
Type
Description
CLK0, CLK1
Input
LVCMOS
PLL reference clock inputs
FB
Input
LVCMOS
PLL feedback signal input, connect directly to QFB output
REF_SEL
Input
LVCMOS
Selects the primary reference clock
MAN/A
Input
LVCMOS
Selects automatic switch mode or manual reference clock selection
ALARM_RST
Input
LVCMOS
Reset of alarm flags and selected reference clock
PLL_EN
Input
LVCMOS
Select PLL or static test mode
FSEL[0:3]
Input
LVCMOS
Clock frequency selection and configuration of clock divider modes
OE/MR
Input
LVCMOS
Output enable/disable and device reset
QA[0:5]
Output
LVCMOS
Bank A clock outputs
QB[0:5]
Output
LVCMOS
Bank B clock outputs
QFB
Output
LVCMOS
Clock feedback output. QFB must be connected to FB for correct operation
ALARM0
Output
LVCMOS
Indicates clock failure on CLK0
ALARM1
Output
LVCMOS
Indicates clock failure on CLK1
CLK_IND
Output
LVCMOS
Indicates currently selected input reference clock
GND
Supply
Ground
Negative power supply
VCC_PLL
Supply
VCC
Positive power supply for the PLL (analog power supply). It is recommended to use an
external RC filter for the analog power supply pin VCC_PLL. Please see the application
section for details.
VCC
Supply
VCC
Positive power supply for I/O and core
Table 2. Function Table
Control
Default
0
1
Inputs
PLL_EN
0
PLL enabled. The input to output frequency relationship
is that according to
Table 3 if the PLL is frequency
locked.
PLL bypassed and IDCS disabled. The VCO output is
replaced by the reference clock signal fref. The MPC9893
is in manual mode.
MAN/A
1
Manual clock switch mode. IDCS disabled. Clock
failure detection and output flags ALARM0, ALARM1,
CLK_IND are enabled.
Automatic clock switch mode. IDCS enabled. Clock failure
detection and output flags ALARM0, ALARM1, CLK_IND
are enabled. IDCS overrides REF_SEL on a clock failure.
IDCS operation requires PLL_EN = 0.
ALARM_RST
1
ALARM0, ALARM1 and CLK_IND flags are reset:
ALARM0=H, ALARM1=H and CLK_IND=REF_SEL.
ALARM_RST is a one-shot function.
ALARM0, ALARM1 and CLK_IND active
REF_SEL
0
Selects CLK0 as the primary clock source
Selects CLK1 as the secondary clock source
FSEL[0:3]
0000
OE/MR
0
Outputs enabled (active)
Outputs disabled (high impedance tristate), reset of data
generators and output dividers. The MPC9893 requires
reset at power-up and after any loss of PLL lock. Loss of
PLL lock may occur when the external feedback path is
interrupted. The length of the reset pulse should be greater
than two reference clock cycles (CLK0,1). OE/MR does not
tristate the QFB output.
Outputs (ALARM0, ALARM1, CLK_IND are valid if PLL is locked)
ALARM0
CLK0 failure
ALARM1
CLK1 failure
CLK_IND
CLK0 is the reference clock
CLK1 is the reference clock