CY28325 Cypress Semiconductor Corp., CY28325 Datasheet - Page 3

• Manufacturer Part Number: CY28325
• Description: FTG For Via Pentium 4 Chipsets
• Manufacturer: Cypress Semiconductor Corp.

Pin Definitions
Swing Select Functions through Hardware
Swing Select Functions
Document #: 38-07119 Rev. **
Pin Name
VTT_PWRGD#
VDD_CPU_CS,
VDD_APIC
VDD_REF,
VDD_48MHz,
VDD _PCI,
VDD_AGP,
VDD_CPU
GND_REF
GND_48MHz,
GND_PCI,
GND_AGP,
GND_CPU,
GND_APIC
MultSEL1
MULTSEL1
0
0
0
0
0
1
1
0
0
1
1
MultSEL0
3, 9, 13, 20, 25,
2, 6, 16, 24, 38
(continued)
36, 44, 47
0
0
1
Board Target
Trace/Term Z
Pin No.
43, 48
33
50
60
50
60
50
60
50
60
Board Target
Trace/Term Z
Type
PRELIMINARY
Pin
50
60
50
G
P
P
I
Reference R, IREF
Pin Description
Power-good from Voltage Regulator Module (VRM): 3.3V LVTTL input.
VTT_PWRGD# is a level sensitive strobe used to determine when FS0:4 and
MULTSEL inputs are valid and OK to be sampled (Active LOW). Once
VTT_PWRGD# is sampled LOW, the status of this input will be ignored.
2.5V Power Connection: Power supply for CPU_CS outputs buffers and APIC
output buffers. Connect to 2.5V.
3.3V Power Connection: Power supply for CPU outputs buffers, 3V66 output
buffers, PCI output buffers, reference output buffers and 48-MHz output buffers.
Connect to 3.3V.
Ground Connection: Connect all ground pins to the common system ground
plane.
IREF = 5.00 mA
IREF = 5.00 mA
IREF = 5.00 mA
IREF = 5.00 mA
IREF = 2.32 mA
IREF = 2.32 mA
IREF = 2.32 mA
IREF = 2.32 mA
Rr = 221 1%,
Rr = 221 1%,
Rr = 221 1%,
Rr = 221 1%,
Rr = 475 1%,
Rr = 475 1%,
Rr = 475 1%,
Rr = 475 1%,
Reference R, IREF =
IREF = 5.00 mA
IREF = 5.00 mA
Rr = 221 1%,
Rr = 221 1%,
Rr = 221 1%,
IREF = 5.00
VDD/(3*Rr)
= VDD/(3*Rr)
IOH = 4*Iref
IOH = 6*Iref
I
I
I
I
I
I
OH
OH
OH
OH
OH
OH
Current
Output
= 4*Iref
= 6*Iref
= 6*Iref
= 4*Iref
= 4*Iref
= 6*Iref
I
I
I
OH
OH
OH
Current
Output
= 4*Iref
= 4*Iref
= 5*Iref
CY28325-2
0.47V @ 50
0.56V @ 60
0.84V @ 60
1.0V @ 50
1.2V @ 60
1.5V @ 50
1.8V @ 60
0.7V @ 50
V
1.25V @ 50
1.0V @ 50
1.2V @ 60
OH
V
OH
@ Z,
Page 3 of 19
@ Z