CY2SSTU32866
1.8V, 25-bit (1:1) or 14-bit (1:2) JEDEC-Compliant
Data Register with Parity
CSR# inputs are HIGH. If either DCS# or CSR# input is LOW,
the Qn outputs will function normally. The RESET# input has
Features
• Operating frequency: DC to 500 MHz
• Supports DDRII SDRAM
priority over the DCS# and CSR# control and will force the
outputs LOW. If the DCS#-control functionality is not desired,
the CSR# input can be hardwired to ground, in which case the
set-up time requirement for DCS# would be the same as for
the other D data inputs.
• Two operations modes: 25 bit (1:1) and 14 bit (1:2)
• 1.8V operation
The device supports low-power standby operation. When the
reset input (RESET#) is LOW, the differential input receivers
are disabled, and undriven (floating) data, clock, and reference
voltage (VREF) inputs are allowed. In addition, when RESET#
is LOW, all registers are reset and all outputs are forced LOW.
The LVCMOS RESET# and Cn inputs must always be held at
a valid logic HIGH or LOW level. To ensure defined outputs
from the register before a stable clock has been supplied,
RESET# must be held in the LOW state during power-up.
• Fully JEDEC-compliant (JESD 82-10)
• 96-ball FBGA
Functional Description
All clock and data inputs are compatible with the JEDEC
standard for SSTL_18. The control inputs are LVCMOS. All
outputs are 1.8-V CMOS drivers that have been optimized to
drive the DDR-II DIMM load. The CY2SSTU32866 operates
from a differential clock (CK and CK#). Data are registered at
the crossing of CK going high, and CK# going LOW.
In the DDR-II RDIMM application, RESET# is specified to be
completely asynchronous with respect to CK and CK#.
Therefore, no timing relationship can be guaranteed between
the two. When entering reset, the register will be cleared and
the outputs will be driven low quickly, relative to the time to
disable the differential input receivers. However, when coming
out of reset, the register will become active quickly, relative to
the time to enable the differential input receivers.
The C0 input controls the pinout configuration of the 1:2 pinout
from A configuration (when LOW) to B configuration (when
HIGH). The C1 input controls the pinout configuration from
25-bit 1:1 (when LOW) to 14-bit 1:2 (when HIGH).
The device monitors both DCS# and CSR# inputs and will gate
the Qn outputs from changing states when both DCS# and
Pin Configuration
1
2
DCKE PPO
3
VREF VDD
4
5
QCKE NC
6
1
2
PPO
NC
3
4
5
6
1
DCKE PPO
2
3
4
5
6
A
B
C
D
E
F
A
B
C
D
E
F
D1
D2
D3
D4
D5
D6
VREF VDD
GND GND Q2A
VDD VDD Q3A
Q1A
Q1B
A
B
C
D
E
F
VREF VDD
GND GND Q2A
VDD VDD Q3A
QCKEA QCKEB
Q2B
Q3B
Q4B
Q5B
Q6B
C0
D2
D3
D15
D16
GND GND Q2
Q3
Q15
Q16
D2
D3
NC
NC
Q2B
Q3B
NC
VDD
VDD
QERR# GND GND Q4A
DODT QERR# GND GND QODT NC
DODT QERR# GND GND QODTA QODTB
NC
NC
VDD
GND GND Q6A
VDD C1
VDD
Q5A
D5
D6
D17
D18
VDD
GND GND Q6
VDD C1
VDD
Q5
Q17
Q18
C0
D5
D6
NC
NC
VDD
GND GND Q6A
VDD C1
VDD
Q5A
Q5B
Q6B
C0
G
H
J
PAR_IN RST# VDD
G
H
J
PAR_IN RST# VDD
G
H
J
PAR_IN RST# VDD
CK
CK#
D8
DCS# GND GND QCSA# QCSB#
CK
DCS# GND GND QCS# NC
CK
DCS# GND GND QCSA# QCSB#
CSR# VDD
VDD
GND GND Q8A
VDD VDD Q9A
ZOH
ZOL
Q8B
Q9B
CK#
D8
CSR# VDD
VDD
GND GND Q8
VDD VDD Q9
GND GND Q10
VDD VDD Q11
GND GND Q12
ZOH
ZOL
Q19
Q20
Q21
Q22
Q23
Q24
Q25
CK#
D8
CSR# VDD
VDD
GND GND Q8A
VDD VDD Q9A
ZOH
ZOL
Q8B
Q9B
K
L
NC
NC
NC
K
L
D19
D20
D21
D22
D23
D24
D25
K
L
NC
NC
NC
NC
NC
NC
NC
D9
D10
D9
D9
M
N
P
R
T
GND GND Q10A Q10B
VDD VDD QODTA QODTB
GND GND Q12A Q12B
M
N
P
R
T
D10
D11
D12
D13
D14
M
N
P
R
T
D10
D11
D12
D13
D14
GND GND Q10A Q10B
VDD VDD Q11A Q11B
GND GND Q12A Q12B
DODT NC
D12
D13
NC
NC
VDD VDD
VREF VDD
Q13A Q13B
QCKEA QCKEB
VDD VDD
VREF VDD
Q13
Q14
VDD VDD
VREF VDD
Q13A Q13B
Q14A Q14B
DCKE NC
1
2
3
4
5
6
1
2
3
4
5
6
1
2
3
4
5
6
1:2 Register A C0 = 0, C1=1
1:2 Register B C0 = 1, C1=1
1:1 Register C0 = 0, C1=0
Rev 1.0, November 25, 2006
2200 Laurelwood Road, Santa Clara, CA 95054
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