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PDF G2987 Data sheet ( Hoja de datos )
| Número de pieza | G2987 | |
| Descripción | DDR Termination Regulator | |
| Fabricantes | Global Mixed-mode Technology | |
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Global Mixed-mode Technology
DDR Termination Regulator
G2987
Features
Support DDR I (1.25 VTT), DDR II (0.9 VTT),
DDR III (0.75 VTT), DDR IIIL (0.675VTT) and
DDR IV (0.6 VTT) Requirements
VCNTL Supply Voltage: 3V to 5.5V
Termination Supply Voltage : 1.2V to 3.6V
Stable with Output Ceramic Capacitor
Over Current Protection
Thermal Shutdown Protection
Shutdown Function for STR (S3) Mode
Adjustable Output Voltage with Resistors
Built-In Soft-Start
Power MOS integrated
SOP-8 (FD) and MSOP-8 (FD) Package
RoHS Compliant
Applications
DDR I/II/III/IIIL/IV Memory Termination
SSTL_3, SSTL_2, SSTL_18, SSTL_15
Notebook/Desktop/Server
Telecom/Datacom, GSM Base Station,
LCD-TV/PDP-TV, Copier/Printer, Set-Top Box
Pin Configuration
General Description
The G2987 is a linear regulator designed to meet the
JEDEC SSTL (Series Stub Termination Logic) speci-
fications in DDRI/II/III/IIIL/IV –SDRAM systems. It pro-
vides accurate and fast response with up to 1.8A
source/sink ability in load transient to track reference
voltage. The terminated voltage can be generated by
two external resistors or programmed by forcing VREF
pin at a desired voltage. Also the G2987 operate in
low power consumption as low as 0.7mA and it has a
shutdown function by setting VREF lower than 0.15V
then the VTT is turned off and discharged via an in-
ternal MOSFET. This function obtains low quiescent
current as 50μA for STR mode.
Ordering Information
ORDER
NUMBER
G2987F11U
G2987F51U
MARKING
G2987
G2987
TEMP.
RANGE
-40°C~85°C
-40°C~85°C
Note: F1: SOP-8 (FD) F5: MSOP-8 (FD)
1: Bonding Code
U : Tape & Reel
PACKAGE
(Green)
SOP-8 (FD)
MSOP-8 (FD)
G2987
VIN 1
8 NC
GND 2
VREF 3
VOUT 4
Thermal
Pad
7 NC
6 VCNTL
5 NC
SOP-8 (FD)/MSOP-8 (FD)
Note: Recommend connecting the Thermal Pad to
the Ground for excellent power dissipation.
Typical Application Circuit
VCNTL=3.3V
VIN=1.8V
2N7002
EN
VCNTL=3.3V
VIN=2.5V
2N7002
EN
DDR I
R1 VIN VCNTL
VREF VOUT
R2 CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
VTT
VCNTL=3.3V
VIN=1.5V
2N7002
EN
DDR II
R1 VIN VCNTL
VREF
VOUT
R2 CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
VTT
DDR III*
R1 VIN VCNTL
VREF
VOUT
R2 CSS
GND
CIN CCNTL
RTT
COUT RDUMMY
VTT
* Recommended VCTRL =3.3V
Ver: 0.4
Jan 16, 2013
TEL: 886-3-5788833
http://www.gmt.com.tw
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