The SY89221U is a 2.5/3.3V precision, high-speed, integrated clock divider and LVPECL fanout buffer capable of handling clocks up to 1.5GHz. Optimized for communications applications, the four independently controlled output banks are phasematched and can be configured for pass through ÷1, ÷2 or ÷4 divider ratios.The differential input includes Micrel's unique, 3-pin input termination architecture that allows the user to interface to any differential signal (AC- or DC-coupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The low-skew, low-jitter outputs are LVPECL compatible with extremely fast rise/fall times that are guaranteed to be less than 220ps.The /MR (master reset) input asynchronously resets the outputs. A four-clock delay after de-asserting /MR allows the counters to synchronize and start the outputs from the same state without any runt pulse.The SY89221U is part of Micrel's Precision Edge® product family.
Additional Features
Four low-skew LVPECL output banks with independently programmable ÷1, ÷2 and ÷4 divider options
Four output banks, 15 total outputs
Guaranteed AC performance over temperature and voltage:
Accepts a clock frequency up to 1.5GHz
<1600ps IN-to-OUT propagation delay
<270ps rise/fall time
<35ps within-bank skew
Fail Safe Input
Prevents outputs from oscillating
Ultra-low jitter design:
<1psRMS random jitter
<10psPP total jitter (clock)
Patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
CMOS/TTL-compatible output enable (EN) and divider select control
2.5V ±5% or 3.3V ±10% power supply
-40°C to +85°C temperature range
Available in 64-pin TQFP
The SY89221U is a 2.5/3.3V precision, high-speed, integrated clock divider and LVPECL fanout buffer capable of handling clocks up to 1.5GHz. Optimized for communications applications, the four independently controlled output banks are phasematched and can be configured for pass through ÷1, ÷2 or ÷4 divider ratios.The differential input includes Micrel's unique, 3-pin input termination architecture that allows the user to interface to any differential signal (AC- or DC-coupled) as small as 100mV (200mVPP) without any level shifting or termination resistor networks in the signal path. The low-skew, low-jitter outputs are LVPECL compatible with extremely fast rise/fall times that are guaranteed to be less than 220ps.The /MR (master reset) input asynchronously resets the outputs. A four-clock delay after de-asserting /MR allows the counters to synchronize and start the outputs from the same state without any runt pulse.The SY89221U is part of Micrel's Precision Edge® product family.
Additional Features
- Four low-skew LVPECL output banks with independently programmable ÷1, ÷2 and ÷4 divider options
- Four output banks, 15 total outputs
- Guaranteed AC performance over temperature and voltage:
- Accepts a clock frequency up to 1.5GHz
- <1600ps IN-to-OUT propagation delay
- <270ps rise/fall time
- <35ps within-bank skew
- Fail Safe Input
- Prevents outputs from oscillating
- Ultra-low jitter design:
- <1psRMS random jitter
- <10psPP total jitter (clock)
- Patent-pending input termination and VT pin accepts DC- and AC-coupled inputs (CML, PECL, LVDS)
- CMOS/TTL-compatible output enable (EN) and divider select control
- 2.5V ±5% or 3.3V ±10% power supply
- -40°C to +85°C temperature range
- Available in 64-pin TQFP
