IDT74FCT3907 Ver la hoja de datos (PDF) - Integrated Device Technology
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IDT74FCT3907 Datasheet PDF : 7 Pages
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IDT74FCT3907
3.3V PC CLOCK SYNTHESIZER
PIN CONFIGURATION
VCC 1
X1 2
X2 3
GND 4
OE 5
CPUCLK0 6
CPUCLK1 7
SO28-2
VCC 8
CPUCLK2 9
CPUCLK3 10
GND 11
SEL1 12
SEL0 13
VCC 14
COMMERCIAL TEMPERATURE RANGES
28 REFCLK0
27 REFCLK1
26 VCC
25 KBCLK
24 FDCLK
23 GND
22 PCICLK2
21 PCICLK3
20 VCC
19 PCICLK4
18 PCICLK5
17 GND
16 PCICLK1
15 PCICLK0
ABSOLUTE MAXIMUM RATINGS(1)
Symbol
Rating
Commercial Unit
VTERM(2) Terminal Voltage
with Respect to GND
–0.5 to +4.6
V
VTERM(3) Terminal Voltage
with Respect to GND
–0.5 to VCC
V
+ 0.5
TA
Operating Temperature
0 to 70
°C
TBIAS
Temperature Under Bias 0 to +70
°C
TSTG
Storage Temperature
–55 to +125 °C
IOUT
DC Output Current
–60 to +60
mA
NOTES:
3245 tbl 01
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RAT-
INGS may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions
above those indicated in the operational sections of this specification is
not implied. Exposure to absolute maximum rating conditions for ex-
tended periods may affect reliability.
2. Vcc terminals.
3. Input, Output and I/O terminals.
3245 drw 02
CAPACITANCE (TA = +25°C, f = 1.0MHz)
Symbol Parameter(1) Conditions Typ. Max. Unit
CIN
Input
VIN = 0V
4.5 6.0 pF
Capacitance
CI/O
I/O
VOUT = 0V 5.5 8.0 pF
Capacitance
NOTE:
3245 lnk 02
1. This parameter is measured at characterization but not tested.
PIN DESCRIPTION
Pin Name
I/O
X1
I
X2
O
SEL0, 1
I
KBCLK
O
FDCLK
O
REFCLK 0, 1
O
CPUCLK 0-3
O
PCICLK 0-5
O
OE
I
Description
14.31818 MHz Crystal Input. This is also the test clock input.
14.31818 MHz Crystal Output
CPUCLK Control Inputs
Keyboard Clock (12MHz)
Floppy Disk Clock (24MHz)
Reference Clocks (14.31818 MHz)
CPU Clocks
PCI Bus Clocks
Output Enable
FUNCTION TABLE
OE
SEL0 SEL1
0
X
X
1
0
0
1
0
1
1
1
0
1
1
1
INPUT CLK
14.31818MHz
14.31818MHz
14.31818MHz
14.31818MHz
TCLK (Test Clock)
CPUCLK
Hi-Z
50MHz
60MHz
66.66MHz
TCLK/2
PCICLK
Hi-Z
CPUCLK/2
CPUCLK/2
CPUCLK/2
TCLK/4
REFCLK
Hi-Z
14.31818MHz
14.31818MHz
14.31818MHz
TCLK
FDCLK
Hi-Z
24MHz
24MHz
24MHz
TCLK/4
3245 tbl 03
KBCLK
Hi-Z
12MHz
12MHz
12MHz
TCLK/8
3245 tbl 04
9.10
2
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