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