CY29949
Document #: 38-07289 Rev. *E
Page 2 of 7
Pin Configuration
Figure 1. Pin Diagram - CY29949
Note
1. PD = internal pull-down, PU = internal pull-up.
MR/OE#
TCLK_SEL
VDD
TCLK0
TCLK1
PECL_CLK
PECL_CLK#
PCLK_SEL
DSELA
DSELB
DSELC
DSELD
VSS
NC
VSS
QC0
VDDC
QC1
VSS
QC2
VDDC
QC3
VSS
VSS
QD5
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
39
38
37
36
35
34
33
32
31
30
29
28
27
14 15 16 17 18 19 20 21 22 23 24 25 26
52 51 50 49 48 47 46 45 44 43 42 41 40
CY29949
Pin Description
Pin
Name
PWR
I/O[1]
Description
6
PECL_CLK
I, PD PECL Input Clock
7
PECL_CLK#
I, PU PECL Input Clock
4, 5
TCLK(0,1)
I, PU External Reference/Test Clock Input
49, 51
QA(1,0)
VDDC
O
Clock Outputs
42, 44, 46
QB(2:0)
VDDC
O
Clock Outputs
31, 33, 35, 37
QC(3:0)
VDDC
O
Clock Outputs
16, 18, 20, 22, 24, 28 QD(5:0)
VDDC
O
Clock Outputs
9, 10, 11, 12
DSEL(A:D)
I, PD Divider Select Inputs. When HIGH, selects
÷2 input divider. When LOW,
selects
÷1 input divider.
2
TCLK_SEL
I, PD TCLK Select Input. When LOW, TCLK0 clock is selected and when
HIGH TCLK1 is selected.
8
PCLK_SEL
I, PD PECL Select Input. When HIGH, PECL clock is selected and when LOW
TCLK(0,1) is selected
1
MR/OE#
I, PD Output Enable Input. When asserted LOW, the outputs are enabled and
when asserted HIGH, internal flip-flops are reset and the outputs are
three-stated. If more than one bank is used in /2 mode, a reset must be
performed (MR/OE# asserted high) after power up to ensure that all
internal flip-flops are set to the same state.
17, 21, 25, 32, 36,
41, 45, 50
VDDC
2.5V or 3.3V Power Supply for Output Clock Buffers
3VDD
2.5V or 3.3V Power Supply
13, 15, 19, 23, 29,
30, 34, 38, 43, 47,
48, 52
VSS
Common Ground
14, 26, 27, 39, 40,
NC
Not Connected
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