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BD3533F Arkusz danych(PDF) 10 Page - Rohm

Numer części BD3533F
Szczegółowy opis  Termination Regulators for DDR-SDRAMs
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Strona internetowa  http://www.rohm.com
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BD3532EFV
PIN CONFIGRATION
PIN FUNCTION
PIN No.
PIN NAME
PIN FUNCTION
1
VTT1
Termination Output Pin 1
2
VTT2
Termination Output Pin 2
3
PGND1
Power Ground Pin 1
4
PGND2
Power Ground Pin 2
5
SGND
Ground Pin for Reference Voltage
6
EN
Enable Input Pin
7
VTTS
Detector Pin for Termination Voltage
8
N.C.
Non Connection
9
VREF
Reference Voltage Output Pin
10
VREFS
Detector Pin for Reference Voltage
11
N.C.
Non Connection
12
VDDQ
Reference Voltage Input Pin
13
N.C.
Non Connection
14
VCC
VCC Pin
15
N.C.
Non Connection
16
VTT_IN1
Termination Input Pin 1
17
VTT_IN2
Termination Input Pin 2
18
N.C.
Non Connection
19
N.C.
Non Connection
20
AGND
Ground Pin for Analog Ground
-
FIN
Substrate (Connected to AGND)
Description of operations
VCC
In BD3533/31/32, an independent power input pin is provided for an internal circuit operation of the IC. This is used to drive
the amplifier circuit of the IC, and its maximum current rating is 4 mA. The power supply voltage is 3.3 to 5.5 volts (BD3533)
or 5 volts (BD3531/32). It is recommended to connect a bypass capacitor of 1 μF or so to VCC.
VDDQ
Reference input pin for the output voltage, that may be used to satisfy the JEDEC requirement for DDR-SDRAM (VTT =
1/2VDDQ) by dividing the voltage inside the IC with two 50 kΩ voltage-divider resistors
For BD3533, care must be taken to an input noise to VDDQ pin because this IC also cuts such noise input into half and
provides it with the voltage output divided in half. Such noise may be reduced with an RC filter consisting of such resistance
and capacitance (220 Ω and 2.2 μF, for instance) that may not give significant effect to voltage dividing inside the IC.
VTT_IN
VTT_IN is a power supply input pin for VTT output. Voltage in the range between 1.0 and 5.5 volts may be supplied to this
VTT_IN terminal, but care must be taken to the current limitation due to on-resistance of the IC and the change in allowable
loss due to input/output voltage difference.
Generally, the following voltages are supplied:
DDR I
VTT_IN=2.5V
DDRII
VTT_IN=1.8V
Higher impedance of the voltage input at VTT_IN may result in oscillation or degradation in ripple rejection, which must be
noted. To VTT_IN terminal, it is recommended to use a 10 μF capacitor characterized with less change in capacitance. But
it may depend on the characteristics of the power supply input and the impedance of the pc board wiring, which must be
carefully checked before use.
VREF
In BD3533/31/32, a reference voltage output pin independent from VTT output is given to provide a reference input for a
memory controller and a DRAM. Even if EN pin turns to “Low” level, VREF output is kept unchanged, compatible with “Self
Refresh” state of DRAM. The maximum current capability of VREF is 20 mA, and a suitable capacitor is needed to stabilize
the output voltage. It is recommended to use a combination of a 1.0 to 2.2 μF ceramic capacitor characterized with less
change in capacitance and a 0.5 to 2.2 Ω phase compensator resistor, or a 10μF ceramic or tantalum capacitor instead. For
an application where VREF current is low, a capacitor of lower capacitance may be used. If VREF current is 1 mA or less, it
is possible to secure a phase margin with a ceramic capacitor of 1 μF more or less.
VTTS
An independent pin provided to improve load regulation of VTT output. In case that longer wiring is needed to the load at
VTT output, connecting VTTS from the load side may improve the load regulation.
VTT1
VTT2
PGND1
PGND2
SGND
EN
VTTS
NC
VREF
VREFS
AGND
NC
NC
VTT_IN
VTT_IN
NC
VCC
NC
VDDQ
NC


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