May 2005
ASM2I99448
rev 0.3
Table 6. AC CHARACTERISTICS (VCC = 3.3V ± 5%, TA = –40°C to +85°C)1
Symbol
fref
Characteristics
Min
0
0
400
1.3
1.4
Typ
Max
350
350
1000
VCC-0.8
Unit
MHz
MHz
mV
V
nS
nS
Condition
Input Frequency
fMAX
Maximum Output Frequency
Peak-to-peak input voltage
Common Mode Range
Reference Input Pulse Width
CCLK Input Rise/Fall Time
VPP
VCMR
PCLK
PCLK
LVPECL
LVPECL
2
tP, REF
tr, tf
1.03
0.8 to 2.0V
tPLH/HL
tPLH/HL
tPLZ, HZ
tPZL, LZ
PCLK to any Q
CCLK to any Q
1.6
1.3
3.6
nS
Propagation delay
3.3
nS
Output Disable Time
Output Enable Time
11
11
nS
nS
CCLK to CLK_STOP
PCLK to CLK_STOP
CCLK to CLK_STOP
PCLK to CLK_STOP
0.0
0.0
1.0
1.5
nS
nS
nS
tS
Setup time
tH
Hold time
nS
pS
nS
tsk(O)
tsk(PP)
tSK(P)
Output-to-output Skew
Device-to-device Skew
Output pulse skew4
150
2.0
PCLK or CCLK to any Q
Using CCLK
300
pS
Using PCLK
400
pS
DCQ
tr, tf
Output Duty Cycle
fQ<170 MHz
45
50
55
%
DCREF = 50%
0.55 to 2.4V
Output Rise/Fall Time
0.1
1.0
nS
Note: 1. AC characteristics apply for parallel output termination of 50ꢀ 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 (VCC = 2.5V ± 5%, TA = –40°C to +85°C)
Symbol
VIH
Characteristics
Min
1.7
-0.3
250
1.0
Typ
Max
VCC + 0.3
0.7
Unit
Condition
V
LVCMOS
Input high voltage
VIL
Input low voltage
Peak-to-peak input voltage
Common Mode Range
Input current2
V
mV
V
LVCMOS
LVPECL
LVPECL
VPP
VCMR
PCLK
PCLK
1
VCC-0.7
300
VIN=GND or
IIN
µA
VIN=VCC
VOH
VOL
Output High Voltage
Output Low Voltage
Output impedance
1.8
V
V
IOH= -15 mA3
IOL= 15 mA3
0.6
2.0
ZOUT
19
ꢀ
4
ICCQ
Maximum Quiescent Supply Current
mA
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 50ꢀ transmission lines on the incident edge. Each output drives one 50ꢀ parallel terminated
transmission line to a termination voltage of VTT. Alternatively, the device drives one 50ꢀ 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.
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.
PULSECORE [ PulseCore Semiconductor ]
