GTL2002DP datasheet(5/14 Pages) PHILIPS

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Philips Semiconductors

Product data sheet

GTL2002

2-bit bi-directional low voltage translator

2004 Sep 29

Uni-directional down translation

For uni-directional clamping, higher voltage to lower voltage, the GREF input must be connected to DREF and both pins pulled to the higher side

VCC through a pull-up resistor (typically 200 kΩ). A filter capacitor on DREF is recommended. Pull-up resistors are required if the chipset 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

Ω resistor to a 3.3 V to 5.5 V VCC supply and SREF is set between 1.0 V to VCC – 1.5 V, the output of each Sn has a maximum

output voltage equal to SREF.

1.8 V

200 k

Ω

GND

GREF

DREF

SREF

1.5 V

1.2 V

1.0 V

SA00643

GTL2002

VCORE

CPU I/O

CHIPSET I/O

TOTEM POLE I/O

TYPICAL UNI-DIRECTIONAL – HIGH TO LOW VOLTAGE TRANSLATION

5 V

VCC

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 (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.

1.8 V

200 k

Ω

GND

GREF

DREF

SREF

1.5 V

1.2 V

1.0 V

SA00644

GTL2002

VCORE

CPU I/O

CHIPSET I/O

TOTEM POLE I/O

OR OPEN DRAIN

TYPICAL UNI-DIRECTIONAL – LOW TO HIGH VOLTAGE TRANSLATION

5 V

VCC

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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