|
Details, datasheet, quote on part number:ICS91719
| |
Datasheet text preview:
Integrated Circuit Systems, Inc.
ICS91719
Low EMI, Spread Modulating, Clock Generator
Features: · ICS91719 is a Spread Spectrum Clock targeted for Mobile PC and LCD panel applications. Generates an EMI optimized clock signal (EMI peak reduction of 714 dB on 3rd-19th harmonics) through use of Spread Spectrum techniques. · ICS91719 focuses on the lower input frequency range of 14.318 to 80.00 MHz with a spread modulation of 20kHz to 40kHz. Specifications: · Supply Voltages: VDD = 3.3V ±0.3V · Frequency range: 14.318 MHz Fin 80 MHz · Cyc to Cyc jitter: <150ps · Output duty cycle 40/60% (worst case) · Guarantees +85°C operational condition. · 16-pin TSSOP package 4.4mm body (173mils), 0.65 mm pitch. · 14.318 MHz crystal input or reference_input.
Pin Configuration
GN D X1_CLKIN X2 GN D A VD D A VDD GN D * * CLKOUT/FS_IN0
1 2 3 4 5 6 7 8
16 15 14 13 12 11 10 9
VD D R EF VD D R EF _SEL_2.5V/ 3.3V# ^ R EF _OUT / VD D R EF _SEL_18V * . **R EF _St o p ^P D # SC LK SD A T A ^SP R EA D _EN A B LE/ F S_IN 1
16-pin TSSOP
Notes: ** Internal pull-down ^ Internal pull-up
Input Select Functionality
FS_IN1
0 0 1 1
FS_IN0
0 1 0 1
MHZ
14.318 in 27.00 out 14.318 in/out 27.00 in/out 48.00 in/out 66.66 in/out
Default Spread %
-0.8% downspread -0.8% downspread -0.8% downspread -0.8% downspread
Block Diagram
REFOUT CLKIN PLL1 Spread Spectrum CLKOUT
REF Voltage Select Functionality
Pin14
0 0 1 1
Pin15
0 1 0 1
REF Voltage
N/A 1.8V 2.5V 3.3V
SPREAD# PD# REF_STOP SDATA SCLK FS_IN0:1
Control Logic Config. Reg.
0506B--09/05/02
ICS91719
Pin Descriptions
P IN # 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 PIN NAME GND X1 _CLKIN X2 GNDA VD D A VD D GND CLK OUT FS_IN0 ^ SPR EAD _EN ABLE FS_IN1 SD AT A SC LK ^ PD # **REF_Stop REF_OUT/VDDREF_SEL_1.8V * * VDDREF_SEL_2.5V/3.3V# ^ VD D R EF PIN TYPE DESCRIP TION PWR IN OUT PWR PWR PWR PWR OUT IN IN IN IN IN IN IN/OUT PWR PWR Ground pin for 3V outputs Crystal input or CLOCKIN input Crystal output Analog ground Analog power supply for 3V Power supply for 3V Ground pin for 3V outputs Modulated clock output Latched input for input frequency select Spread enable pin Latched input for input frequency select Data pin for I2C circuitry 5V tolerant Clock pin for I2C circuitry 5V tolerant Power down Stop control for REF_CLOCK output STOP:1, RUNNING:0 REF_CLOCK output REF_CLOCK power supply voltage select Power supply for REF_CLOCK
^ internal pull-up **i nternal pull-down
0506B--09/05/02
2
ICS91719
Table 1: Frequency Configuration Table (See I2C Byte 0)
FS4 FS 3 FS2 FS 1 FS0 Sprd Type Sprd %
0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 0 0 0 0 1 1 1 1 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 0 0 1 1 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 0 1 1 0 DOWN 1 0 1 SPREAD (-) 0 1 Center 0 1 Spread (+/-) 0 1 0 DOWN 1 0 SPREAD 1 (-) 0 1 0 1 0 1 CE NTER 0 SPREAD 1 (+/-) 0 1 0 DOWN 1 0 1 SPREAD (-) 0 1 Center 0 1 Spread (+/-) 0.60 0.80 1.00 1.25 1.50 2.00 0.50 1.00 0.60 0.80 1.00 1.25 1.50 1.75 2.00 2.50 3.00 0.30 0.40 0.50 0.70 1.00 1.20 1.50 0.60 0.80 1.00 1.25 1.50 2.00 0.50 1.00
1 4 in/27 ou t
1 4i n/14 ou t 2 7i n/27 ou t
4 8i n/48 ou t 6 6i n/66 ou t
0506B--09/05/02
3
|
|
