CY2254A
PCI Clock Driver Strength Requirements
• Matched impedances on both rising and falling edges on
the output drivers
• Output impedance: 25Ω (typical) measured at 1.5V
• Maximum output impedance: 40Ω measured at 1.5V
Maximum Ratings
(Above which the useful life may be impaired. For user guide-
lines, not tested.)
Supply Voltage........................................................−0.5 to +7.0V
Input Voltage
................................................. −0.5V
to V
DD
+ 0.5
Storage Temperature (Non-Condensing)
.... −65°C
to +150°C
Junction Temperature............................................... +150°C
Package Power Dissipation.............................................. 1W
Static Discharge Voltage............................................ >2000V
(per MIL-STD-883, Method 3015)
CPU Clock Driver Strength Requirements
• Matched impedances on both rising and falling edges on
the output drivers
• Output impedance: 25Ω (typical) measured at 1.5V
• Maximum output impedance: 40Ω measured at 1.5V
Operating Conditions
[3]
Parameter
V
DD
T
A
C
L
Supply Voltage 3.3V
Supply Voltage 5.0V
Operating Ambient Temperature
Max. Capacitive Load on
CPUCLK
PCICLK
IOCLK
KBDCLK / USBCLK
REF0
REF1
Reference Frequency, Oscillator Nominal Value
Power-up time for all VDD's to reach minimum specified voltage (power
ramps must be monotonic)
14.318
0.05
Description
Min.
3.135
4.5
0
Max.
3.6
5.5
70
20
30
20
20
30
15
14.318
50
MHz
ms
Unit
V
V
°C
pF
f
(REF)
t
PU
Electrical Characteristics
V
DD
= 3.135V
−
3.6V, or 5.0V
±10%,
T
A
= 0°C to +70°C
Parameter
V
IH
V
IL
V
OH[4]
Description
High-level Input Voltage
Low-level Input Voltage
High-level Output Voltage
Except Crystal Inputs
Except Crystal Inputs
V
DD
= V
DD
Min.
I
OH
= 6 mA
I
OH
= 12 mA
I
OH
= 4 mA
I
OH
= 8 mA
V
OL[4]
Low-level Output Voltage
V
DD
= V
DD
Min.
I
OL
= 6 mA
I
OL
= 12 mA
I
OL
= 4 mA
I
OL
= 8 mA
I
IH
I
IL
I
OZ
I
DD
Input High Current
Input Low Current
Output Leakage Current
Power Supply Current
V
IH
= V
DD,
V
DD
= 3.3V
V
IH
= V
DD,
V
DD
= 5.0V
V
IL
= 0 V, V
DD
= 3.3V
V
IL
= 0 V, V
DD
= 5.0V
Three-state
V
DD
= 3.6V, V
IN
= 0 or V
DD
V
DD
= 5.5V, V
IN
= 0 or V
DD
−10
CPUCLK
PCICLK, REF0
KBDCLK, USBCLK
REF1
CPUCLK
PCICLK, REF0
KBDCLK, USBCLK
REF1
5
10
100
250
+10
90
150
µA
µA
µA
µA
µA
mA
mA
0.4
V
2.4
Test Conditions
Min.
2.0
0.8
Max.
Unit
V
V
V
Document #: 38-07203 Rev. *A
Page 3 of 8
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