CY28343
Zero Delay SDR/DDR Clock Buffer
Features
鈥?Phase-lock loop clock distribution for DDR and SDR
SDRAM applications
鈥?One-single-end clock input to 6 pairs DDR outputs or
13 SDR outputs.
鈥?External feedback pins FBIN_SDR/FBOUT_SDR are
used to synchronize the outputs to the clock input for
SDR.
Table 1. Function Table
SELDDR_SDR#
1= DDR Mode
CLKIN
2.5V
Compatible
3.3V
Compatible
SDRAM(0:12)
OFF
DDRT/C(0:5)
Active
2.5V
Compatible
OFF
FBIN_DDR
2.5V
Compatible
OFF
FBOUT_DDR
Active
2.5V
Compatible
OFF
FBIN_SDR FBOUT_SDR
OFF
OFF
鈥?External feedback pins FBIN_SDR/FBOUT_SDR are
used to synchronize the outputs to the clock input for
DDR.
鈥?SMBus interface enables/disables outputs.
鈥?Conforms to JEDEC SDR/DDR specifications
鈥?Low jitter, low skew
鈥?48 pin SSOP package
0 = SDRAM Mode
Active
3.3V
Compatible
Active
3.3V
Compatible
Active
3.3V
Compatible
Block Diagram
Pin Configuration
[1]
SCLK
SDATA
Control
Logic
VDD_2.5V
FBOUT_DDR
VDD_3.3V
DDRT(0:5)
DDRC(0:5)
CLKIN
FBIN_DDR
VDD_3.3V
FBOUT_SDR
PLL
*SELDDR_SDR
FBIN_SDR
SDRAM (0:12)
VDD_3.3V
SDRAM0
SDRAM1
SDRAM2
SDRAM3
VSS
VDD_3.3V
SDRAM4
SDRAM5
CLKIN
SDRAM6
SDRAM7
VSS
VDD_3.3V
SDRAM8
SDRAM9
SDRAM10
SDRAM11
VSS
VDD_3.3V
SDRAM12
FBOUT_SDR
FBIN_SDR*
VSS
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
28
27
26
25
SELDDR_SDR#*
FBIN_DDR*
FBOUT_DDR
VDD_2.5V
DDRT5
DDRC5
DDRT4
DDRC4
VSS
VDD_2.5
DDRT3
DDRC3
DDRT2
DDRC2
VSS
VDD_2.5V
DDRT1
DDRC1
DDRT0
DDRC0
VSS
VDD_3.3V
SCLK**
SDATA**
Note:
1. Pins marked with [*] have internal pull-down resistors. Pins marked with [**] have internal pull-up resistors.
Cypress Semiconductor Corporation
Document #: 38-07369 Rev. *A
鈥?/div>
3901 North First Street
鈥?/div>
San Jose
鈥?/div>
CA 95134 鈥?408-943-2600
Revised December 26, 2002
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