4

604 Hardware Specifications

Preliminary/Subject to Change without Notice

1.3.1 Clock AC Specifications

Table 5 provides the clock AC timing specifications as defined in Figure 1.

Figure 1 provides the SYSCLK input timing diagram.

Figure 1. SYSCLK Input Timing Diagram

Table 5. PowerPC 604 Microprocessor Clock AC Timing Specifications

Vdd = 3.3

± 5% V dc, GND = 0 V dc, 0 ≤ T

j ≤ 105 °C

Num

Characteristic

100 MHz

120 MHz

133 MHz

Unit

Notes

Min

Max

Min

Max

Min

Max

Frequency of operation

50

100.0

60.0

120.0

66.67

133.3

MHz

1

Frequency of VCO

180

360

180

360

180

360

MHz

2

SYSCLK frequency

16.67

66.67

20.0

66.67

22.2

66.67

MHz

3

1

SYSCLK cycle time

15.0

60.0

15.0

50.0

15.0

45.0

ns

2,3

SYSCLK rise and fall time

1.0

2.0

1.0

2.0

1.0

2.0

ns

4

4

SYSCLK duty cycle measured at 1.4 V

40

60

40

60

40

60

%

5

SYSCLK jitter

—

±150

—

±150

—

±150

ps

5

6

Internal PLL relock time

—

100

—

100

—

100

µs

6, 7

Notes:

1. Times shown in specifications are only valid for the range of processor core frequencies specified.

2. Caution: The SYSCLK frequency and PLL_CFG0–PLL_CFG3 settings must be chosen such that the

resulting CPU (core) frequency and PLL (VCO) frequency do not exceed their respective maximum or

minimum operating frequencies.

3. AC timing specifications are tested up to the maximum SYSCLK (bus) frequency shown in Table 5.

However, it is theoretically possible to attain higher SYSCLK frequencies if allowed for by system design.

4. Rise and fall times for the SYSCLK input are measured from 0.4 V to 2.4 V.

5. This number refers to cycle-to-cycle jitter.

6. 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. Also note that HRESET must be held asserted for a

minimum of 255 bus clocks after the PLL relock time (100

µs) during the power-on reset sequence.

7. Relock timing is guaranteed by design and is not tested.

VM

CVil

CVih

VM = Midpoint Voltage (1.4 V)

SYSCLK

1

2

3

4

Freescale Semiconductor, Inc.

For More Information On This Product,

Go to: www.freescale.com

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