參數(shù)資料
型號: GTL2002
廠商: NXP Semiconductors N.V.
英文描述: 2-bit bi-directional low voltage translator
中文描述: 2位雙向電壓轉(zhuǎn)換低
文件頁數(shù): 5/14頁
文件大?。?/td> 114K
代理商: GTL2002
Philips Semiconductors
Product data sheet
GTL2002
2-bit bi-directional low voltage translator
2004 Sep 29
5
Uni-directional down translation
For uni-directional clamping, higher voltage to lower voltage, the G
REF
input must be connected to D
REF
and both pins pulled to the higher side
V
CC
through a pull-up resistor (typically 200 k
). A filter capacitor on D
REF
is recommended. Pull-up resistors are required if the chipset I/O are
open drain. The opposite side of the reference transistor (S
REF
) is connected to the processor core supply voltage. When D
REF
is connected
through a 200 k
resistor to a 3.3 V to 5.5 V V
CC
supply and S
REF
is set between 1.0 V to V
CC
– 1.5 V, the output of each Sn has a maximum
output voltage equal to S
REF
.
1.8 V
200 k
GND
G
REF
D
REF
S
REF
S1
S2
D1
D2
1.5 V
1.2 V
1.0 V
SA00643
GTL2002
V
CORE
CPU I/O
CHIPSET I/O
TOTEM POLE I/O
TYPICAL UNI-DIRECTIONAL – HIGH TO LOW VOLTAGE TRANSLATION
5 V
V
CC
EASY MIGRATION TO
LOWER VOLTAGE AS PRO-
CESSOR GEOMETRY
SHRINKS.
Figure 5. Uni-directional down translation, to protect low voltage processor pins
Uni-directional up translation
For uni-directional up translation, lower voltage to higher voltage, the reference transistor is connected the same as for a down translation.
A pull-up resistor is required on the higher voltage side (Dn or Sn) to get the full HIGH level, since the GTL–TVC device will only pass the
reference source (S
REF
) voltage as a HIGH when doing an up translation. The driver on the lower voltage side only needs pull-up resistors if it is
open drain.
1.8 V
200 k
GND
G
REF
D
REF
S
REF
S1
S2
D1
D2
1.5 V
1.2 V
1.0 V
SA00644
GTL2002
V
CORE
CPU I/O
CHIPSET I/O
TOTEM POLE I/O
OR OPEN DRAIN
TYPICAL UNI-DIRECTIONAL – LOW TO HIGH VOLTAGE TRANSLATION
5 V
V
CC
EASY MIGRATION TO
LOWER VOLTAGE AS PRO-
CESSOR GEOMETRY
SHRINKS.
Figure 6. Uni-directional up translation, to higher voltage chip sets
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