參數(shù)資料
型號(hào)： CY28346ZXC-2T
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 12/19頁(yè)
文件大?。?/td> 0K
描述： IC CLOCK DIFF OUT CK408 56TSSOP
標(biāo)準(zhǔn)包裝： 2,000
類型： *
PLL： 是
輸入： 晶體
輸出： 時(shí)鐘
電路數(shù)： 1
比率 - 輸入:輸出： 1:21
差分 - 輸入:輸出： 無(wú)/是
頻率 - 最大： 200MHz
除法器/乘法器： 是/無(wú)
電源電壓： 3.135 V ~ 3.465 V
工作溫度： 0°C ~ 70°C
安裝類型： *
封裝/外殼： *
供應(yīng)商設(shè)備封裝： *
包裝： *
CY28346-2
........................ Document #: 38-07509 Rev. *B Page 2 of 19
Pin Description
Pin
Name
PWR
I/O
Description
2XIN
VDD
I
Oscillator Buffer Input. Connect to a crystal or to an external clock.
3XOUT
VDD
O
Oscillator Buffer Output. Connect to a crystal. Do not connect when an
external clock is applied at XIN.
52, 51, 49, 48,
45, 44
CPUT(0:2),
CPUC(0:2)
VDD
O
Differential host output clock pairs. See Table 1 for frequencies and
functionality.
10, 11, 12, 13,
16, 17, 18
PCI(0:6)
VDDP
O
PCI clock outputs. Are synchronous to 66IN or 3V66 clock. See Table 1.
5, 6, 7
PCIF (0:2)
VDD
O
33-MHz PCI clocks, which are
2 copies of 66IN or 3V66 clocks, may
be free running (not stopped when PCI_STP# is asserted LOW) or
may be stoppable depending on the programming of SMBus
register Byte3, Bits (3:5).
56
REF
VDD
O
Buffered output copy of the device’s XIN clock.
42
IREF
VDD
I
Current reference programming input for CPU buffers. A resistor is
connected between this pin and VSSIREF.
28
VTT_PWRGD#
VDD
I
Qualifying input that latches S(0:2) and MULT0. When this input is at
a logic low, the S(0:2) and MULT0 are latched.
39
48M_USB
VDD48
O
Fixed 48-MHz USB clock outputs.
38
48M_DOT
VDD48
O
Fixed 48-MHZ DOT clock outputs.
33
3V66_0
VDD
O
3.3V 66-MHz fixed frequency clock.
35
3V66_1/VCH
VDD
O
3.3V clock selectable with SMBus byte0, Bit5, when Byte5, Bit5.
When Byte 0 Bit 5 is at a logic 1, then this pin is a 48M output clock. When
byte0, Bit5 is a logic 0, then this is a 66M output clock (default).
25
PD#
VDD
I
PU
This pin is a power-down mode pin. A logic LOW level causes the
device to enter a power-down state. All internal logic is turned off except
for the SMBus logic. All output buffers are stopped.
43
MULT0
VDD
I
PU
Programming input selection for CPU clock current multiplier.
55, 54
S(0,1)
I
Frequency select inputs. See Table 1
29
SDATA
I
Serial data input. Conforms to the SMBus specification of a Slave
Receive/Transmit device. It is an input when receiving data. It is an open
drain output when acknowledging or transmitting data.
30
SCLK
I
Serial clock input. Conforms to the SMBus specification.
40
S2
VDD
I
T
Frequency select input. See Table 1. This is a Tri-level input that is
driven HIGH, LOW, or driven to a intermediate level.
34
PCI_STP#
VDD
I
PU
PCI clock disable input. When asserted LOW, PCI (0:6) clocks are
synchronously disabled in a LOW state. This pin does not effect PCIF
(0:2) clocks’ outputs if they are programmed to be PCIF clocks via the
device’s SMBus interface.
53
CPU_STP#
VDD
I
PU
CPU clock disable input. When asserted LOW, CPUT (0:2) clocks are
synchronously disabled in a HIGH state and CPUC(0:2) clocks are
synchronously disabled in a LOW state.
24
66IN/3V66_5
VDD
I/O
Input connection for 66CLK(0:2) output clock buffers if S2 = 1, or
output clock for fixed 66-MHz clock if S2 = 0. See Table 1.
21, 22, 23
66B(0:2)/
3V66(2:4)
VDD
O
3.3V clock outputs. These clocks are buffered copies of the 66IN clock
or fixed at 66 MHz. See Table 1.
1, 8, 14, 19, 32,
37, 46, 50
VDD
–
PWR 3.3V power supply.
4, 9, 15, 20, 27,
31, 36, 47
VSS
–
PWR Common ground.
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