PRELIMINARY
C9851
Clock Generator for Pentium III Server and Workstation Applications
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 3
Host Clock (HCSL) Buffer Characteristics
Characteristic
Minimum
Maximum
Ro
3000 Ohms (recommended)
N/A
Ros
Vout
Unspecified
N/A
Unspecified
1.2 Volt
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 functions table. For all configurations, the
deviation from the expected output current is +/- 7% as shown in the table current accuracy (page 12).
Cypress Semiconductor Corporation
525 Los Coches St.
Document#: 38-07068 Rev. **
05/04/2001
Milpitas, CA 95035. Tel: 408-263-6300, Fax: 408-263-6571
http://www.cypress.com
Page 9 of 14
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