ICST ICSSSTUF32864A 25-bit configurable registered buffer for ddr2 Datasheet

ICSSSTUF32864A
Integrated
Circuit
Systems, Inc.
25-Bit Configurable Registered Buffer for DDR2
Pin Configuration
Recommended Application:
•
DDR2 Memory Modules
•
Provides complete DDR DIMM solution with
ICS97U877
•
Ideal for DDR2 400, 533 and 667
1
2
3
4
5
6
A
B
C
D
Product Features:
•
25-bit 1:1 or 14-bit 1:2 configurable registered buffer
•
Supports SSTL_18 JEDEC specification on data
inputs and outputs
•
Supports LVCMOS switching levels on C0, C1 and
RESET# inputs
•
Low voltage operation
VDD = 1.7V to 1.9V
•
Available in 96 BGA package
•
Drop-in replacement for ICSSSTUF32866
•
Green packages available
E
F
G
H
J
K
L
M
N
P
R
T
96 Ball BGA
(Top View)
Truth Table
I nputs
RST#
H
DCS#
CSR#
L
L
H
L
L
H
L
L
H
L
H
H
L
H
H
L
H
Outputs
CK
L or H
L or H
CK#
L or H
L or H
Dn,
DODT,
DCK E
Qn
L
L
QCS#
L
QODT,
QCKE
H
H
L
H
A DCKE
NC
V REF
X
Q0
Q0
Q0
B D2
D15
GND
GND
Q2
Q15
L
L
L
L
C D3
D16
V DD
V DD
Q3
Q16
QCKE
NC
H
H
L
H
Q0
Q0
Q0
D DODT
NC
GND
GND
QODT
NC
L
E
D5
D17
V DD
V DD
Q5
Q17
F D6
D18
GND
GND
Q6
Q18
G NC
RST#
V DD
V DD
C1
C0
DCS#
GND
GND
QCS#
NC
V DD
ZOH
ZOL
H
L
L
H
L
H
H
L
H
H
H
H
H
H
L
X
Q0
Q0
Q0
H
H
H
L
Q0
H
L
L or H
V DD
X
H
L or H
Ball Assignments
L
H
H
H
H
Q0
H
H
H CK
H
H
H
L or H
L or H
X
Q0
Q0
Q0
J CK#
CSR#
V DD
L
X or
Floating
X or
Floating
X or
Floating
X or
Floating
X or
Floating
L
L
L
K D8
D19
GND
GND
Q8
Q19
D9
L
M D10
D20
V DD
V DD
Q9
Q20
D21
GND
GND
Q10
Q21
N D11
D22
V DD
V DD
Q11
Q22
P D12
D23
GND
GND
Q12
Q23
D13
D24
V DD
V DD
Q13
Q24
T D14
D25
V REF
V DD
Q14
Q25
R
1
2
3
4
5
6
1:1 Register (C0 = 0, C1 = 0)
0987B—09/28/04
ICSSSTUF32864A
Ball Assignments
Ball Assignments
A D1
NC
V REF
V DD
Q1A
Q1B
D2
NC
GND
GND
Q2A
Q2B
C D3
D D4
NC
V DD
V DD
Q3A
Q3B
QODTB
NC
GND
GND
Q4A
Q4B
Q5A
Q5B
E D5
NC
V DD
V DD
Q5A
Q5B
Q6A
Q6B
F D6
NC
GND
GND
Q6A
Q6B
NC
RST#
V DD
V DD
C1
C0
A DCKE
NC
V REF
V DD
QCKEA
QCKEB
D2
NC
GND
GND
Q2A
Q2B
B
C D3
D DODT
NC
V DD
V DD
Q3A
Q3B
NC
GND
GND
QODTA
E D5
NC
V DD
V DD
F D6
NC
GND
GND
B
G NC
RST#
V DD
V DD
C1
C0
G
H CK
DCS#
GND
GND
QCSA#
QCSB#
H CK
DCS#
GND
GND
QCSA#
QCSB#
J CK#
CSR#
V DD
V DD
ZOH
ZOL
J CK#
CSR#
V DD
V DD
ZOH
ZOL
K D8
NC
GND
GND
Q8A
Q8B
K D8
NC
GND
GND
Q8A
Q8B
D9
L
M D10
NC
V DD
V DD
Q9A
Q9B
L
D9
NC
V DD
V DD
Q9A
Q9B
NC
GND
GND
Q10A
Q10B
M D10
NC
GND
GND
Q10A
Q10B
N D11
NC
V DD
V DD
Q11A
Q11B
N DODT
NC
V DD
V DD
QODTA
QODTB
P D12
NC
GND
GND
Q12A
Q12B
P D12
NC
GND
GND
Q12A
Q12B
R D13
NC
V DD
V DD
Q13A
Q13B
R D13
NC
V DD
V DD
Q13A
Q13B
T D14
NC
V REF
V DD
Q14A
Q14B
T DCKE
NC
V REF
V DD
QCKEA
QCKEB
5
6
1
2
3
4
1
1:2 Register A (C0 = 0, C1 = 1)
2
3
4
5
6
1:2 Register B (C0 = 1, C1 = 1)
General Description
This 25-bit 1:1 or 14-bit 1:2 configurable registered buffer is designed for 1.7-V to 1.9-V VDD operation.
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. ICSSSTUF32864A operates
from a differential clock (CK and CK#). Data are registered at the crossing of CK going high, and CK# going low.
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 supports low-power standby operation. When the reset input (RST#) is low, the differential input receivers
are disabled, and undriven (floating) data, clock and reference voltage (VREF) inputs are allowed. In addition, when
RST# is low all registers are reset, and all outputs are forced low. The LVCMOS RST# 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,
RST# must be held in the low state during power up.
In the DDR-II RDIMM application, RST# 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.
As long as the data inputs are low, and the clock is stable during the time from the low-to-high transition of RST# until
the input receivers are fully enabled, the design of the ICSSSTUF32864A must ensure that the outputs will remain
low, thus ensuring no glitches on the output.
The device monitors both DCS# and CSR# inputs and will gate the Qn outputs from changing states when both DCS#
and CSR# inputs are high. If either DCS# or CSR# input is low, the Qn outputs will function normally. The RST input
has priority over the DCS# and CSR# control and will force the outputs low. If the DCS#-control functionality is not
desired, then the CSR# input can be hardwired to ground, in which case, the setup-time requirement for DCS# would
be the same as for the other D data inputs. Package options include 96-ball LFBGA (MO-205CC).
0987B—09/28/04
2
ICSSSTUF32864A
Ball Assignment
Terminal Name
GND
Description
Electrical
Characteristics
Ground
Ground input
VDD
Power supply voltage
1.8V nominal
VREF
Input reference voltage
0.9V nominal
ZOH
Reserved for future use
Input
ZOL
Reserved for future use
Input
CK
Positive master clock input
Differential input
CK
Negative master clock input
Differential input
C0, C1
Configuration control inputs
LVCMOS inputs
RST#
Asynchronous reset input - resets registers and disables VREF data and
clock differential-input receivers
LV C M O S i n p u t
CSR#, DCS#
Chip select inputs - disables D1 - D24 outputs switching when both inputs
SSTL_18 input
are high
Data input - clock in on the crossing of the rising edge of CK and the
falling edge of CK#
SSTL_18 input
DODT
The outputs of this register bit will not be suspended by the DCS# and
CSR# control
SSTL_18 input
DCKE
The outputs of this register bit will now be suspended by the DCS# and
CSR# control
SSTL_18 input
Data ouputs that are suspended by the DCS# and CSR# control
1.8V CMOS
Data output that will not be suspended by the DCS# and CSR# control
1.8V CMOS
D1 - D25
Q1 - Q25
QCS#
QODT
Data output that will not be suspended by the DCS# and CSR# control
1.8V CMOS
QCKE
Data output that will not be suspended by the DCS# and CSR# control
1.8V CMOS
0987B—09/28/04
3
ICSSSTUF32864A
Block Diagram for 1:1 mode (positive logic)
RST#
CK
CK#
VREF
DCKE
D
C1
QCKEA
C1
QODTA
R
DODT
D
R
DCS#
1D
C1
QCSA#
R
CSR#
D1
0
1
1D
Q1A
C1
R
To 21 Other Channels
*Note: Disabled in 1:1 configuration
0987B—09/28/04
4
Q1B *
ICSSSTUF32864A
Block Diagram for 1:2 mode (positive logic)
RST#
CK
CK#
VREF
DCKE
1D
QCKEA
C1
DODT
R
QCKEB*
1D
QODTA
C1
DCS#
R
QODTB*
1D
QCSA#
C1
R
QCSB#*
1D
Q1A
CSR#
D1
0
1
C1
R
To 10 Other Channels
*Note: Disabled in 1:1 configuration
0987B—09/28/04
5
Q1B *
ICSSSTUF32864A
Absolute Maximum Ratings
Storage Temperature . . . . . . . . . . . . . . . . . . . .
Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . .
Input Voltage 1,2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output Voltage1,2 . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input Clamp Current . . . . . . . . . . . . . . . . . . . .
Output Clamp Current . . . . . . . . . . . . . . . . . . .
Continuous Output Current . . . . . . . . . . . . . . .
VDD or GND Current/Pin . . . . . . . . . . . . . . . .
–65°C to +150°C
-0.5V to 2.5V
-0.5V to +2.5V
-0.5V to VDD + 0.5V
±50 mA
±50mA
±50mA
±100mA
Package Thermal Impedance 3
36°C
...............
Notes:
1. The input and output negative voltage
ratings may be excluded if the input
and output clamp ratings are observed.
2. This value is limited to 2.5V maximum.
3. The package thermal impedance is
calculated in accordance with
JESD 51.
Stresses above those listed under Absolute Maximum Ratings may cause permanent damage to the device. These
ratings are stress specifications only and functional operation of the device at these or any other conditions above those
listed in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions
for extended periods may affect product reliability.
Recommended Operating Conditions
PARAMETER
VDD
V REF
V TT
VI
V IH (DC)
V IH (AC)
V IL (DC)
V IL (AC)
V IH
VIL
VICR
V ID
IOH
IOL
TA
DESCRIPTION
I/O Supply Voltage
Reference Voltage
Termination Voltage
Input Voltage
DC Input High Voltage
AC Input High Voltage
Data Inputs
DC Input Low Voltage
AC Input Low Voltage
Input High Voltage Level
RESET#,
C0, C1
Input Low Voltage Level
Common mode Input Range
CLK, CLK#
Differential Input Voltage
High-Level Output Current
Low-Level Output Current
Operating Free-Air Temperature
1
MIN
TYP
1.7
1.8
0.49 x V DD
0.5 x VDD
VREF - 0.04
V REF
0
V REF + 0.125
V REF + 0.250
MAX
1.9
0.51 x V DD
VREF + 0.04
V DD
V REF - 0.125
V REF - 0.250
UNITS
V
0.65 x V DD
0.675
0.600
0
0.35 x V DD
1.125
-8
8
70
mA
°C
Guaranteed by design, not 100% tested in production.
Note: Reset# and Cn inputs must be helf at valid logic levels (not floating) to ensure proper device operation.
The differential inputs must not be floating unless Reset# is low.
0987B—09/28/04
6
ICSSSTUF32864A
Electrical Characteristics - DC
TA = 0 - 70°C; VDD = 2.5 +/-0.2V (unless otherwise stated)
SYMBOL
PARAMETERS
VIK
VOH
VOL
II
All Inputs
Standby (Static)
IDD
Operating (Static)
I DDD
Ci
CONDITIONS
II = -18mA
IOH = -6mA
IOL = 6mA
VI = V DD or GND
RESET# = GND
VI = V IH(AC) or VIL(AC),
RESET# = VDD
RESET# = VDD,
Dynamic operating
VI = V IH(AC) or VIL(AC),
(clock only)
CLK and CLK# switching
50% duty cycle.
IO = 0
RESET#
= VDD,
Dynamic Operating
(per each data input) VI = V IH(AC) or VIL (AC),
CLK and CLK# switching
1:1 mode
50% duty cycle. One data
Dynamic Operating input switching at half
(per each data input) clock frequency, 50%
1:2 mode
duty cycle
VI = V REF ±350mV
Data Inputs
CLK and CLK#
VICR = 1.25V, VI(PP) = 360mV
RESET#
VI = V DD or GND
Notes:
1 - Guaranteed by design, not 100% tested in production.
0987B—09/28/04
7
V DD
MIN
1.7V
1.7V
1.9V
1.2
TYP
1.8V
UNITS
V
0.5
5
100
-5
1.9V
MAX
-1.2
µA
µA
TBD
mA
TBD
µ/clock
MHz
TBD
µA/ clock
MHz/data
TBD
2.5
2
3.5
3
2.5
pF
ICSSSTUF32864A
Timing Requirements
(over recommended operating free-air temperature range, unless otherwise noted)
MIN
MAX
SYMBOL
PARAMETERS
Clock frequency
335
f clock
Pulse
duration,
CK,
CK
High
or
Low
tW
1
Differential inputs active time (See notes 1 and 2)
10
t ACT
Differential
inputs
inactive
time
(See
notes
1
and
3)
t INACT
15
DCS before CK, CK↓,
Setup time
CSR high; CSR before
0.7
CK, CK↓, DCS high
DCS before CK, CK↓,
0.5
CSR Low
t SU
Setup time
DODT, DCKE and data
0.5
before CK, CK↓
Setup time
PAR_IN before CK, CK↓
DCS, DODT, DCKE and
0.50
th
Hold time
data after CK, CK↓
PAR_IN after CK, CK↓
0.50
1 - Guaranteed by design, not 100% tested in production.
Notes:
2 - For data signal input slew rate of 1V/ns.
3 - For data signal input slew rate of 0.5V/ns and < 1V/ns.
4 - CLK/CLK# signal input slew rate of 1V/ns.
UNITS
MHz
ns
ns
ns
Switching Characteristics
(over recommended operating free-air temperature range, unless otherwise noted)
VDD = 1.8V ±0.1V
From
To
SYMBOL
UNITS
MIN
TYP
MAX
(Input)
(Output)
fmax
335
MHz
CLK, CLK#
Q
1.41
1.75
ns
t PDM1
Q
t PDMSS2 CLK, CLK#
t phl
RESET#
Q
Notes: 1. Includes 350ps test-load transmission-line delay
2. Guaranteed by design, not 100% tested in production.
1.95
ns
3
ns
Output Buffer Characteristics
Output edge rates over recommended operating free-air temperature range (See figure 7)
VDD = 1.8V ± 0.1V
UNIT
PARAMETER
MIN
MAX
dV/dt_r
1
4
V/ns
dV/dt_f
1
4
V/ns
1
dV/dt_∆
1
V/ns
1. Difference between dV/dt_r (rising edge rate) and dV/dt_f (falling edge rate)
0987B—09/28/04
8
ns
ns
ns
ns
ns
ns
ICSSSTUF32864A
VDD
DUT
td = 350ps
TL =50Ω
CK Inputs
CK#
CK
RL = 1000Ω
TL=350ps, 50Ω
Out
Test Point
CL = 30 pF
(see Note 1)
Test Point
RL = 1000Ω
RL = 100Ω
LOAD CIRCUIT
Test Point
VCMOS
RST#
Inp ut
VDD
VDD/2
VDD/2
t in act
IDD
(see
Note 2)
VID
0V
CK
CK
t PLH
90%
t PHL
10%
VOH
Output
VOLTAGE AND CURRENT WAVEFORMS
INPUTS ACTIVE AND INACTIVE TIMES
VICR
V TT
VTT
VICR
VOLTAGE WAVEFORMS – PULSE DURATION
LVCMOS
RST#
Input
VID
CK#
VIH
VDD /2
VIL
VICR
t RPHL
CK
t su
Inpu t
VOL
VOLTAGE WAVEFORMS – PROPAGATION DELAY TIMES
VID
tw
Inpu t
VICR
VICR
t act
VREF
VOH
th
Output
VREF
VIH
VTT
VOL
VOLTAGE WAVEFORMS – PROPAGATION DELAY TIMES
VIL
VOLTAGE WAVEFORMS – SETUP AND HOLD TIMES
Figure 6 — Parameter Measurement Information (VDD = 1.8V ± 0.1V)
Notes: 1. CL incluces probe and jig capacitance.
2. IDD tested with clock and data inputs held at VDD or GND, and Io = 0mA.
3. All input pulses are supplied by generators having the following chareacteristics: PRR ≤10 MHz,
Zo=50Ω, input slew rate = 1 V/ns ±20% (unless otherwise specified).
4. The outputs are measured one at a time with one transition per measurement.
5. VREF = VDD/2
6. VIH = VREF + 250 mV (ac voltage levels) for differential inputs. VIH = VDD for LVCMOS input.
7. VIL = VREF - 250 mV (ac voltage levels) for differential inputs. VIL = GND for LVCMOS input.
8. VID = 600 mV
9. tPLH and tPHL are the same as tPDM.
0987B—09/28/04
9
ICSSSTUF32864A
VDD
DUT
RL = 50Ω
Out
Test Point
C L = 10 pF
(see Note 1)
LOAD CIRCUIT – HIGH-TO-LOW SLEW-RATE MEASUREMENT
Output
VOH
80%
20%
dv _f
VOL
dt _f
VOLTAGE WAVEFORMS – HIGH-TO-LOW SLEW-RATE MEASUREMENT
DUT
Out
Test Point
CL = 10 pF
(see Note 1)
RL = 50Ω
LOAD CIRCUIT – LOW-TO-HIGH SLEW-RATE MEASUREMENT
dt _r
dv _r
80%
VOH
20%
Output
VOL
VOLTAGE WAVEFORMS – LOW-TO-HIGH SLEW-RATE MEASUREMENT
Figure 7 — Output Slew-Rate M easurement I nfor mation (V DD = 1.8 V ± 0.1 V)
Notes: 1. CL includes probe and jig capacitance.
2. All input pulses are supplied by generators having the following characteristics: PRR ≤ 10MHz, ZO =
50Ω, input slew rate = 1 V/ns ±20% (unless otherwise specified).
0987B—09/28/04
10
ICSSSTUF32864A
C
Seating
Plane
A1
Numeric Designations
for Horizontal Grid
b
REF
T
4 3 2 1
A
B
C
D
D
Alpha Designations
for Vertical Grid
(Letters I, O, Q & S
not used)
d TYP
D1
- e - TYP
TOP VIEW
E
c
REF
h
TYP
- e - TYP
E1
0.12 C
ALL DIMENSIONS IN MILLIMETERS
D
E
T
Min/Max
e
----- BALL GRID ----HORIZ
VERT
Max.
TOTAL
d
Min/Max
h
Min/Max
16.00 Bsc
5.50 Bsc
1.30/1.50
0.80 Bsc
6
19
114
0.40/0.50
13.50 Bsc
5.50 Bsc
1.30/1.50
0.80 Bsc
6
16
96
0.40/0.50
7.00 Bsc
4.50 Bsc
0.86/1.00
0.65 Bsc
6
10
60
0.35/0.45
Note: Ball grid total indicates maximum ball count for package. Lesser quantity may be used.
0.31/0.41
0.25/0.41
0.15/0.21
REF. DIMENSIONS
b
c
0.80
0.75
0.575
* Source Ref.: JEDEC Publication 95,
10-0055C
Ordering Information
ICSSSTUF32864AyHLF-T
Example:
ICS XXXX y H LF- T
Designation for tape and reel packaging
Lead Free (Optional)
Package Type
H = BGA
Revision Designator (will not correlate with datasheet revision)
Device Type
Prefix
ICS = Standard Device
0987B—09/28/04
11
0.75
0.75
0.625
MO-205
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