ILSI America LLC 5458 Louie Lane, Reno, NV 89511 | 775-851-8880

ISM91

- 5 mm x 7 mm Ceramic Package SMD Oscillator, TTL / HC-MOS
Product Features:
Low Jitter, Non-PLL Based Output
CMOS/TTL Compatible Logic Levels
Compatible with Leadfree Processing
Applications:
Fibre Channel
Server & Storage
Sonet /SDH
802.11 / Wifi
T1/E1, T3/E3
System Clock
Frequency 1 MHz  to  170 MHz
Current
70 mA Max. ***
Duty CycleSpecify 50% ±10% or ±5% See Table in Part Number Guide
Enable / Disable Time100 nS Max.
Frequency StabilitySee Frequency Stability Table (Includes room temperature tolerance and stability over operating temperature)
Jitter: RMS (1sigma)
1 MHz - 75 MHz5 pS RMS (1 sigma) Max. accumulated jitter (20K adjacent periods)
76 MHz - 170 MHz3 pS RMS (1 sigma) Max. accumulated jitter (20K adjacent periods)
Max Integrated
1 MHz - 75 MHz1.5 pS RMS (1 sigma -12KHz to 20MHz)
76 MHz - 170 MHz1 pS RMS (1 sigma -12KHz to 20MHz)
Max Total Jitter
1 MHz - 75 MHz50 pS p-p (100K adjacent periods)
76 MHz - 170 MHz30 pS p-p (100K adjacent periods)
Operating TemperatureSee Operating Temperature Table in Part Number Guide
Output Level
HC-MOS0 = 0.1 VCC Max., 1 = 0.9 VCC Min.
TTL0 = 0.4 VDC Max., 1 = 2.4 VDC Min.
Output Load
Fo < 50 MHz = 10 TTL, Fo > 50 MHz = 5 LSTTL See Table in Part Number Guide.
Rise / Fall Time5 nS Max. @ VCC = + 3.3VDC, 10 nS Max. @ VCC = +5 VDC ***
Start-up Time10 mS Max.
Storage Temperature-55° C to +125° C
Supply VoltageSee input Voltage Table, tolerance ±5%
product photo image

Part Number Guide

- Sample Part Number: ISM91 - 3251BH - 20.000 MHz
PackageInput VoltageOperating TemperatureSymmetry (Duty Cycle)OutputStability (in ppm)Enable / DisableFrequency
ISM915 = 5.0V1 = 0° C to +70° C5 = 45 / 55 Max.1 = 10 TTL / 15 pF HC-MOS**E = ±10H = Enable20.000 MHz
3 = 3.3V6 = -10°C to +70°C6 = 40 / 60 Max.5 = 50 pF HC-MOS (<40 MHz)**D = ±15O = N/C
7 = 3.0V3 = -20°C to +70°C6 = 30 pF**F = ±20
2 = 2.7V4 = -30°C to +75°CA = ±25
6 = 2.5V2 = -40°C to +85°CB = ±50
1 = 1.8V *C = ±100
 
NOTE: A 0.01 µF bypass capacitor is recommended between Vcc (pin 4) and Gnd (pin 2) to minimize power supply noise.
* Not available at all frequencies.
** Not available for all temperature ranges
*** Frequency, supply, and load related parameters.