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DDR110-xxT7RL
®
May 2001 - Ed: 2
DOUBLE DATA RATE TERMINATION
NETWORK WITH DISABLE SWITCH
■10 bits Termination Network.
■Integrated Termination resistor (Rs)
■Enable input TTL level compatible
■Impedance matching ± 2% (A0-B0 / An-Bn)
■Optimized Low Crosstalk for parallel
Termination to Vtt.
■Optimized Low propagation delay
FEATURES AND BENEFITS
The DDR110 provides 10 bits resistor Network to
be used for SDR/DDR (double data rate) SDRAM
bus Termination.
This device has a series resistors (Rs) to reduce
signalreflectionnoise.Thiseliminatesthe need for
external terminating resistors.
The DDR Termination Nerwork is enabled with the
output Enable pin (OE). When OE is HIGH Inputs
are connected to Outputs (A connected to B).
When OE is LOW every inputs are in High
impedance state (Hi - Z).
The DDR Termination Network is a bidirectional
device when the internal switch is ON. When the
switch is OFF, the device will block current in both
directions.
This device is made using ST IPADTM (Integrated
Passive & Active devices) technology.
DESCRIPTION
ASD™
IPAD™ Computer
DDR(doubledatarate)TerminationNetworkused
on.
■Motherboard
■Workstation
■Server
■Notebooks
MAIN APPLICATION
1
24
12
TSSOP24
Rs
A0 B0
VSS VCC
OE NC
Rs
A5 B5
Rs
A2 B2
Rs
A3 B3
Rs
A1 B1
Rs
A6 B6
Rs
A7 B7
Rs
A8 B8
Rs
A9 B9
Rs
A4 B4
GATE
CONTROL
124
12
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DDR110-xxT7RL
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Symbol Parameter Test Conditions Value Unit
Min. Typ. Max.
VIN Input voltage DQ0/7, DM0, DQS0 OE LOW
OE HIGH 0
0+ 3.3
+ 2.5 V
VIH Output Enable (OE) HIGH voltage Guaranteed logic
HIGH level 25
(1) V
VIL Output Enable (OE) LOW voltage Guaranteed logic
LOW level 0.8 V
VCC Supply voltage 4.5 5 5.5 V
VTT Termination voltage 1.25 V
(1) Open collector output with 10k pull-up resistor to 5V is recommended for typical OE signal.
RECOMMENDED OPERATING CONDITIONS (Tamb = 25°C)
Symbol Parameter Test Conditions
Value
UnitTambient = 25°C
Min. Typ. Max.
VCC Supply voltage range - 0.5 5 7 V
VIN Input voltage range DQ0/7, DM0,
DQS0 - 0.5 7 V
VTT Termination voltage - 0.5 7 V
VOE Termination Enable Voltage range - 0.5 7 V
IIN Continuous input current 30 mA
VESD ESD ratings (input / output YOE) HBM MIL STD 883C 2kV
T
STG Storage temperature - 65 150 °C
ABSOLUTE MAXIMUM RATINGS (Tamb = 25°C)
OE B0 - B9 Function
High A0 - A9 Connect Termination
Low Hi - Z Disconnect Termination
FUNCTION TABLE
®
DDR110-xxT7RL
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DDR Address
DDR Control
DDR Data / Strobe
System
Controller
Chipset
(North Bridge)
DDR 184-pin DIMM slot
DDR 184-pin DIMM slot
SDR 168-pin DIMM slot
SDR 168-pin DIMM slot
5V
Enable
10 bits
10 bits
10 bits
VTT
DDR
110
DDR
110
DDR
110
DDR
110
APPLICATION SCHEMATICS
Symbol Parameter Test conditions Value Unit
Min. Typ. Max.
RON Switch ON Resistance VTT = 1.25V, VIN = 0V,OE=+5V
DDR110-27
DDR110-56 22
45 27
56 32
67 Ω
Ω
IOFF INPUT Leakage
current Switch OFF INPUT = + 3.3V, OE = 0V 1µA
C
OFF OFF-state capacitance VIN = 0V, 1MHz, 30mVRMS,
OE=0V 6pF
ELECTRICAL CHARACTERISTICS (Tamb = 25°C - Vcc = 5V)
VCC
GND
OE
DQ7
DQ6
DM0
DQ5
DQ4
DQ3
DQ2
DQS0
DQ1
DQ0
ENABLE HIGH
OE
ENABLE HIGH
V IslandTT
Decoupling
Capacitor
to GND Plane
NC
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DDR110-xxT7RL
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Pin # Assignement for DDR
Termination Pin # Assignement for DDR
Termination
1VSS = GND 24 VCC
2A0 23 B0
3A1 22 B1
4A2 21 B2
5A3 20 B3
6A4 19 B4
7A5 18 B5
8A6 17 B6
9A7 16 B7
10 A8 15 B8
11 A9 14 B9
12 Termination enable HIGH 13 Not Connected
PIN ASSIGNEMENT
1
2
5
3
4
6
7
8
9
10
11
12
24
13
14
15
16
17
18
19
20
21
22
23
DDR1 10 - 27 T7 RL
Double Data Rate
Single switch
10-BIT Wide
Rs value in
27 , 56 Ω
ΩΩ
Package code
T7:TSSOP24
Tape & Reel
OTHER INFORMATION
®
DDR110-xxT7RL
5/5
Informationfurnishedisbelievedtobeaccurateandreliable.However,STMicroelectronicsassumesnoresponsibilityfortheconsequencesof
useofsuchinformationnor for any infringement of patents or other rights of third parties which may result from its use. No license is granted by
implication or otherwise under any patent or patent rights of STMicroelectronics. Specifications mentioned in this publication are subject to
change without notice. This publication supersedes and replaces all information previously supplied.
STMicroelectronics products are not authorized for use as critical components in life support devices or systems without express written ap-
proval of STMicroelectronics. The ST logo is a registered trademark of STMicroelectronics
© 2001 STMicroelectronics - Printed in Italy - All rights reserved.
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Type Marking Package Weight Base qty Delivery mode
DDR110-27T7RL DDR110-27 TSSOP-24 0.088 g 2500 Tape & Reel
DDR110-56T7RL DDR110-56 TSSOP-24 0.088 g 2500 Tape & Reel
■Epoxy meets UL94 - V0 standard
PACKAGE MECHANICAL DATA
TSSOP-24
1
24
12
13
beA1
AA2
E
D
c
L
k
E1
L1
REF. DIMENSIONS
Millimeters Inches
Min. Typ. Max. Min. Typ. Max.
A 1.200 0.047
A1 0.050 0.150 0.002 0.006
A2 0.800 1.000 1.050 0.031 0.039 0.041
b 0.190 0.300 0.007 0.012
c 0.090 0.200 0.004 0.008
D 7.700 7.800 7.900 0.303 0.307 0.311
E 6.400 0.252
E1 4.300 4.400 4.500 0.169 0.173 0.177
e 0.65 0.026
k0°8°0°8°
L 0.450 0.600 0.750 0.017 0.024 0.029
L1 1.000 0.039
0.65mm
6.8mm 4.4mm
0.30mm
8.00mm
FOOTPRINT
