ASM2I99446 datasheet(5/14 Pages) ALSC

5 / 14 page

July 2005

ASM2I99446

rev 0.4

2.5V and 3.3V LVCMOS Clock Distribution Buffer

5 of 14

Notice: The information in this document is subject to change without notice.

Table 7: AC CHARACTERISTICS (V

CC = VCCA = VCCB = VCCC = 3.3V ±5%, TA = –40°C to +85°C)

Symbol

Characteristics

Min

Typ

Max

Unit

Condition

fref

Input Frequency

250

MHz

fMAX

Maximum Output Frequency

÷1 output

÷2 output

250

125

MHz

FSELx=0

FSELx=1

tP, REF

Reference Input Pulse Width

1.4

tr, tf

CCLK Input Rise/Fall Time

1.0

0.8 to 2.0V

tPLH

tPHL

Propagation delay

CCLK0,1 to any Q

2.2

2.8

4.45

4.2

tPLZ, HZ

Output Disable Time

tPZL, LZ

Output Enable Time

tsk(O)

Output-to-output Skew

Within one bank

Any output Bank, Same output divider

Any output, Any output divider

150

200

350

tsk(PP)

Device-to-device Skew

2.25

tSK(P)

Output pulse skew

200

DCQ

Output Duty Cycle

÷1 output

÷2 output

DCREF = 50%

DCREF = 25%-75%

tr, tf

Output Rise/Fall Time

0.1

1.0

0.55 to 2.4V

Note: 1 AC characteristics apply for parallel output termination of 50Ω to VTT

2 The ASM2I99446 is functional up to an input and output clock frequency of 350MHz and is characterized up to 250MHz.

3 Violation of the 1.0nS maximum input rise and fall time limit will affect the device propagation delay, device-to-device skew, reference input pulse width,

output duty cycle and maximum frequency specifications.

4 Output pulse skew is the absolute difference of the propagation delay times | tpLH - tpHL |.

Table 8: DC CHARACTERISTICS (V

CC = VCCA = VCCB = VCCC = 2.5V ±5%, TA = –40°C to +85°C)

Symbol

Characteristics

Min

Typ

Max

Unit

Condition

VIH

Input High Voltage

1.7

VCC + 0.3

LVCMOS

VIL

Input Low Voltage

-0.3

0.7

LVCMOS

VOH

Output High Voltage

1.8

IOH=-15 mA

VOL

Output Low Voltage

0.6

IOL= 15 mA

ZOUT

Output Impedance

17 - 20

Ω

IIN

Input Current

±200

µA

VIN=GND or VIN=VCC

ICCQ

Maximum Quiescent Supply Current

2.0

All VCC Pins

Note: 1 The ASM2I99446 is capable of driving 50Ω transmission lines on the incident edge. Each output drives one 50Ω parallel terminated transmission line to

a termination voltage of VTT. Alternatively, the device drives up to two 50Ω series terminated transmission lines per output.

2 Input pull-up / pull-down resistors influence input current.

3 ICCQ is the DC current consumption of the device with all outputs open and the input in its default state or open.

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