+/+…when timing is critical
C9853
High Performance Pentium III Clock Generator
Preliminary
Buffer Characteristics
Current Mode CPU Clock Buffer Characteristics
The current mode output buffer detail and current reference circuit details are contained elsewhere in this datasheet.
The following parameters are used to specify output buffer characteristics:
1. Output impedance of the current mode buffer circuit - Ro (see Figure 3).
2. Minimum and maximum required voltage operation range of the circuit – Vop (see Figure 3).
3. Series resistance in the buffer circuit – Ros (see Figure 3).
4. Current accuracy at given configuration into nominal test load for given configuration.
VDD3 (3.3V +/- 5%)
Ro
Iout
Ros
0V
1.2V
Iout
Vout = 1.2V max
Vout
Figure 5
Host Clock (HCSL) Buffer Characteristics
Characteristic
Minimum
Maximum
N/A
1.2V
Ro
3000 Ohms (recommended)
N/A
Vout
Iout is selectable depending on implementation. The parameters above apply to all configurations. Vout is the voltage at
the pin of the device.
The various output current configurations are shown in the host swing select function table. For all configurations, the
deviation from the expected output current is +/- 7% as shown in the table current accuracy (page 12).
INTERNATIONAL MICROCIRCUITS, INC. 525 LOS COCHES ST.
MILPITAS, CA TEL 408-263-6300, FAX 408-263-6571
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1.0
4/13/2000
Page 12 of 16
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