sy89538l Micrel Semiconductor, sy89538l Datasheet - Page 4

• Manufacturer Part Number: sy89538l
• Description: Sy89538l 3.3v Precision Lvpecl And Lvds Programmable Multiple Output Bank Clock
• Manufacturer: Micrel Semiconductor

Pin Description
Power
Control and Configuration
January 2008
19, 40, 43, 51
Pin Number
Pin Number
16, 30, 31,
47, 55
6, 56
2, 7
15
62
63
10
36
37
23
25
57
59
1
RSEL1, RSEL0
Exposed Pad
Pin Name
Pin Name
PSEL0
PSEL1
PSEL2
PSEL3
VCCA
VCCD
VCCO
GNDA
INSEL
GND,
LSEL
LEN
LR
LF
Pin Function
Analog PLL Power Pin. Connects to “quiet” 3.3V supply. 3.3V power pins must be
connected together on the PCB. Bypass with 0.1µF//0.01µF low ESR capacitors and
place them as close to the VCCA pin as possible.
Digital Logic Core Power Pin. VCCD connects to a 3.3V supply. All power pins must
be connected together on the PCB. Bypass with 0.1µF//0.01µF low ESR capacitors
and place them as close to the VCCD pin as possible.
LVDS and LVPECL Output Driver Power Pins. These outputs can be powered from a
2.5V or 3.3V supply. Connect all VCCO pins to the same power supply: 3.3V ±10% or
2.5V ±5%. All power pins must be connected together on the PCB. Bypass with
0.1µF//0.01µF low ESR capacitor and place them as close to the VCCO pin as
possible.
Analog PLL Ground. Connect to “quiet” ground. GNDA and GND must be connected
together on the PCB.
Ground: GND pins and exposed pad must both be connected to the same ground
plane.
Pin Function
Analog Input/Output. Provides the reference voltage for the PLL loop filter and is
used with the LF pin. See “External Loop Filter Considerations” for recommended
loop filter values.
Analog Input/Output. Provides the loop filter node for the PLL. See “External Loop
Filter Considerations” for recommended loop filter values.
TTL/CMOS Reference input pre-scalar and Zero Delay MUX divider select inputs.
The two-bit input pre-scalar divides the input reference frequency by /1, /2, /4, or /8.
RSEL0 is the LSB bit. See “Reference Input Divider and Zero Delay MUX Divider
Select Table” for proper decoding. The threshold voltage V
pull-up. The default logic is HIGH.
TTL/CMOS Input Select Control. Selects either XTAL or Reference (RFCK) input.
Internal 25kΩ pull-up. The default is logic HIGH, and selects the XTAL input. The
threshold voltage V
Logic HIGH: XTAL Select
Logic LOW: Reference Input Select
TTL/CMOS input select control signal for the LVDS LOUT0-LOUT2 outputs. LSEL,
DSEL, and LEN are used together to decode the selection and post divider of the
LVDS outputs. Internal 25kΩ pull-up. See “LVDS Output Post-Divider and Frequency
Select Table” for proper decoding. The threshold voltage V
logic is HIGH.
TTL/CMOS input enable pin. Used to control the LOUT0-LOUT2 outputs and acts as
a frequency select pin. LEN, DSEL, and LSEL are used together to decode the
selection and post divide of the LVDS output bank, see the “LVDS Output Post-
Divider and Frequency Select Table” for proper decoding. Internal 25kΩ pull-up.
When disabled, LOUT0-LOUT2 outputs are LOW, and the complimentary outputs are
HIGH. The threshold voltage V
TTL/CMOS input select control signals for the PECL POUT0-POUT3 outputs. PSELx,
DSEL and PENx are used together to decode the selection and post divider of the
PECL outputs. PSELx pins include an internal 25kΩ pull-up. The threshold voltage
V
proper decoding.
TH
= V
CC
/2. See "LVPECL Output Post-Divider and Frequency Select Table” for
TH
= V
4
CC
/2.
TH
= V
CC
/2. The default logic is HIGH.
[e-mail]
TH
TH
= V
= V
CC
CC
/2. The default
/2. Internal 25kΩ
or [phone]
M9999-010808-E