EMI Reducing Spread Spectrum Clock Oscillators (SSXOs)
MERCURY
Since 1973
18HM Series (+1.8 V Supply Voltage)
Group “F”
General Specifications: at Ta=+25°C, CL=15 pF
18HM572: 5 x 7 x 1.4 mm
Product Models / Package Sizes
18HM53:
18HM32:
Group “F”
3.2 x 5 x 1.2 mm
2.5 x 3.2 x 1.0 mm
Performance Characteristics
Frequency Range
12.5 ~ 42.0 MHz
EMI Reduction Rate
Total % Down Spread (D) Center Spread (C) (EMI reduction is applied to the entire
spectrum)
Spread Type / Spread Percentage
/ EMI Reduction Rate
0.5%
1%
2%
-0.5% (D0.5)
-1% (D1)
-2% (D2)
±0.25 (C0.25)
±0.5 (C0.5)
±1.0 (C1.0)
-12 dB typical
-16 dB typical
-18 dB typical
For 12.5 MHz: 10.1 KHz min.; 11.7 KHz typical; 13.9 KHz max.
For 26 MHz: 21.1 KHz min.; 24.4 KHz typical; 29 KHz max.
For 42 MHz: 34.0 KHz min.; 39.4 KHz typical; 46.8 KHz max.
Frequency dependent. Call for details.
Modulation Carrier Frequency
(Dither rate, number of clocks per
one modulation)
Output Logic
CMOS Square Wave
Input Voltage (VDD)
VDD = +1.8 ±0.15 V D.C.
Commercial (-10°C to +70°C):
“A”: ±25 ppm ; “B’: ±50 ppm; “C”:±100 ppm
Frequency Stability
(exclude modulation)
Industrial (-40°C to +85°C):
“D”: ±25 ppm ; “E’: ±50 ppm; “F”:±100 ppm
Output Voltage “High”; “1”
Output Voltage “Low”; “0”
Rise Time / Fall Time
Load
1.6 V min.; 1.85 V max. IOH = -2 mA
0.0 V min.; 0.2 V max. IOL = 2 mA
2.5 n sec. max. (10% VDD ↔ 90% VDD)
15 pF max.
Output Impedance
Output Slew Rate
Start-up Time
30 Ω typical.
0.4 V/ns min.; 3.0 V/ns max. VOL-VOH, 15 pf Load
2 ms typical; 5 ms max.
40 ms max.
Stabilization Time
13 MHz: 2.0 mA typical
16 MHz: 2.8 mA typical
25 MHz: 3.5 mA typical
42 MHz: 5.0 mA typical
Current Consumption
Duty Cycle
50%±10%. ( CL=15 pF ;at 50% VDD)
100 ps rms max.
Cycle-to-cycle Jitter
Aging
±5 ppm per year max.; Ta=+25°C
Output is high impedance when taken low. Internal circuit is
still operating.
When taken LOW
Pin 1 Function
When taken HIGH or float
Output
Output enable /disable time: 100 ns max.
Absolute Maximum Ratings
Power Supply Voltage VDD
Input Voltage
-0.5 V min; +2.5V max.
Vss-0.5V min.; VDD+0.5V max.
Vss-0.5V min.; VDD+0.5V max.
-40°C min.; +125°C max.
-13 mA min.; +13 mA max.
Output Voltage
Operation Junction Temperature
Output Current
MERCURY
Page 2 of 5
Oct. 11. 2012
Rev. 0
MERCURY [ MERCURY UNITED ELECTRONICS INC ]
