GTL2003 Philips Semiconductors (Acquired by NXP), GTL2003 Datasheet - Page 6

• Manufacturer Part Number: GTL2003
• Manufacturer: Philips Semiconductors (Acquired by NXP)

NXP Semiconductors
GTL2003_1
Product data sheet
8.2 Unidirectional down translation
8.3 Unidirectional up translation
For unidirectional clamping, higher voltage to lower voltage, the GREF input must be
connected to DREF and both pins pulled to the higher side V
(typically 200 k ). A filter capacitor on DREF is recommended. Pull-up resistors are
required if the chip set I/O are open-drain. The opposite side of the reference transistor
(SREF) is connected to the processor core supply voltage. When DREF is connected
through a 200 k resistor to a 3.3 V to 5.5 V V
to (V
For unidirectional 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 (SREF) 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.
Fig 5. Unidirectional down translation to protect low voltage processor pins
Fig 6. Unidirectional down translation to protect low voltage processor pins
CC
easy migration to lower voltage
as processor geometry shrinks
easy migration to lower voltage
as processor geometry shrinks
Typical unidirectional HIGH-to-LOW voltage translation.
Typical unidirectional LOW-to-HIGH voltage translation.
1.5 V), the output of each Sn has a maximum output voltage equal to SREF.
1.8 V
1.5 V
1.2 V
1.0 V
1.8 V
1.5 V
1.2 V
1.0 V
V
V
totem pole I/O
or open-drain
CORE
CORE
CPU I/O
CPU I/O
Rev. 01 — 27 July 2007
GND
SREF
S1
S2
GND
SREF
S1
S2
GTL2002
GTL2002
CC
8-bit bidirectional low voltage translator
GREF
GREF
DREF
DREF
supply and SREF is set between 1.0 V
D1
D2
D1
D2
200 k
200 k
CC
through a pull-up resistor
GTL2003
© NXP B.V. 2007. All rights reserved.
totem pole I/O
CHIPSET I/O
CHIPSET I/O
002aac061
002aac062
V
V
CC
CC
5 V
5 V
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