Page 10
Version 2.0
Datasheet
9/30/99
PowerPC 750 SCM RISC Microprocessor
PID8p-750
Preliminary Copy
AC Electrical Characteristics
This section provides the AC electrical characteristics for the PID8p-750. After fabrication, parts are sorted by
tested for conformance to the AC specifications for that frequency. These specifications are for 300MHz
through 400MHz processor core frequencies. The processor core frequency is determined by the bus
(SYSCLK) frequency and the settings of the PLL_CFG(0-3) signals. Parts are sold by maximum processor
Clock AC Specications
The following table provides the clock AC timing specifications as defined in
Figure 2.Clock AC Timing Specications8
Num
Characteristic
300*, 333*, 350*, 366, 375MHz
400, 433, 450, 466, 500MHz
Unit Notes
Min
Max
Min
Max
Processor fre-
quency
200
As per specified speed
250
As per specified speed
MHz
SYSCLK frequency
25
100
31
100
MHz
1
SYSCLK cycle time
10
40
10
32
ns
2,3
SYSCLK rise and
fall time
–
1.0
–
1.0
ns
2,3
4
SYSCLK duty cycle
measured at OVDD/
2
40
60
40
60
%
3,7
SYSCLK jitter
–
±150
–
±150
ps
4,3
Internal PLL relock
time
–
100
–
100
s5
Note:
1. Caution: The SYSCLK frequency and the PLL_CFG[0-3] settings must be chosen such that the resulting SYSCLK (bus) frequency, CPU (core) fre-
quency, and PLL (VCO) frequency do not exceed their respective maximum or minimum operating frequencies. Refer to the PLL_CFG[0-3] signal
2. Rise and fall times for the SYSCLK input are measured from 0.5v to 1.5v
3. Timing is guaranteed by design and characterization, and is not tested.
4. The total input jitter (short term and long term combined) must be under
±150ps.
5. Relock timing is guaranteed by design and characterization, and is not tested. PLL-relock time is the maximum amount of time required for PLL lock
after a stable VDD and SYSCLK are reached during the power-on reset sequence. This specification also applies when the PLL has been disabled and
subsequently re-enabled during sleep mode. Also note that HRESET must be held asserted for a minimum of 255 bus clocks after the PLL-relock time
during the power-on reset sequence.
6. * Subject to availability - see your marketing representative.
7. Duty cycle for 1.8, 2.5, and 3.3v I/Os.