ASM2I99448 datasheet(5/15 Pages) ALSC

5 / 15 page

May 2005

ASM2I99448

rev 0.3

3.3V/2.5V LVCMOS 1:12 Clock Fanout Buffer

5 of 15

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

Table 6. AC CHARACTERISTICS (V

CC = 3.3V ± 5%, TA = –40°C to +85°C)

Symbol

Characteristics

Min

Typ

Max

Unit

Condition

fref

Input Frequency

350

MHz

fMAX

Maximum Output Frequency

350

MHz

VPP

Peak-to-peak input voltage

PCLK

400

1000

LVPECL

VCMR

Common Mode Range

PCLK

1.3

VCC-0.8

LVPECL

tP, REF

Reference Input Pulse Width

1.4

tr, tf

CCLK Input Rise/Fall Time

1.0

0.8 to 2.0V

tPLH/HL

Propagation delay

PCLK to any Q

CCLK to any Q

1.6

1.3

3.6

3.3

tPLZ, HZ

Output Disable Time

tPZL, LZ

Output Enable Time

Setup time

CCLK to CLK_STOP

PCLK to CLK_STOP

0.0

Hold time

CCLK to CLK_STOP

PCLK to CLK_STOP

1.0

1.5

tsk(O)

Output-to-output Skew

150

tsk(PP)

Device-to-device Skew

PCLK or CCLK to any Q

2.0

tSK(P)

DCQ

Output pulse skew

Output Duty Cycle

Using CCLK

Using PCLK

fQ<170 MHz

300

400

DCREF = 50%

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. VCMR (AC) is the crosspoint of the differential input signal. Normal AC operation is obtained when the crosspoint is within the VCMR range and the input

swing lies within the VPP (AC) specification. Violation of VCMR or VPP impacts tPLH/HL and tSK(PP).

3. Violation of the 1.0 nS 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 7. DC CHARACTERISTICS (V

CC = 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

VPP

Peak-to-peak input voltage

PCLK

250

LVPECL

VCMR

Common Mode Range

PCLK

1.0

VCC-0.7

LVPECL

IIN

Input current

300

µA

VIN=GND or

VIN=VCC

VOH

Output High Voltage

1.8

IOH= -15 mA

VOL

Output Low Voltage

0.6

IOL= 15 mA

ZOUT

Output impedance

Ω

ICCQ

Maximum Quiescent Supply Current

2.0

All VCC Pins

Note: 1. VCMR (DC) is the crosspoint of the differential input signal. Functional operation is obtained when the crosspoint is within the VCMR

range and the input swing lies within the VPP (DC) specification.

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

3. The ASM2I99448 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 one 50Ω series terminated transmission lines at VCC=2.5V.

4. 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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