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GTL2000DL,518

P1-P3P4-P6P7-P9P10-P12P13-P13
Philips Semiconductors Product data
GTL2000
22-bit bi-directional low voltage translator
2003 Apr 01
4
APPLICATIONS
Bi-directional translation
For the bi-directional clamping configuration, higher voltage to lower voltage or lower voltage to higher voltage, the G
REF
input must be
connected to D
REF
and both pins pulled to high side V
CC
through a pull-up resistor (typically 200 kΩ). A filter capacitor on D
REF
is
recommended. The processor output can be totem pole or open drain (pull up resistors may be required) and the chipset output can be totem
pole or open drain (pull up resistors are required to pull the Dn outputs to V
CC
). However, if either output is totem pole, data must be
uni-directional or the outputs must be 3-statable and the outputs must be controlled by some direction control mechanism to prevent high to low
contentions in either direction. If both outputs are open drain, no direction control is needed. The opposite side of the reference transistor (S
REF
)
is connected to the processor core power supply voltage. When D
REF
is connected through a 200 kΩ resistor to a 3.3 V to 5.5 V V
CC
supply
and S
REF
is set between1.0 V to V
CC
- 1.5 V, the output of each Sn has a maximum output voltage equal to S
REF
and the output of each Dn
has a maximum output voltage equal to V
CC
.
1.8 V
GND G
REF
S
REF
S1
S2
D1
D2
1.5 V
1.2 V
1.0 V
SA00642
GTL2002
V
CORE
CPU I/O CHIPSET I/O
TOTEM POLE OR
OPEN DRAIN I/O
TYPICAL BI-DIRECTIONAL VOLTAGE TRANSLATION
5 V
V
CC
S5
Sn
D5
Dn
CHIPSET I/O
3.3 V
V
CC
D3
D4
S3
S4
INCREASE BIT
SIZE BY USING
10 BIT GTL2010 OR
22 BIT GTL2000
D
REF
200 KΩ
Figure 1. Bi-directional translation to multiple higher voltage levels such as an I
2
C bus application
Philips Semiconductors Product data
GTL2000
22-bit bi-directional low voltage translator
2003 Apr 01
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 kΩ). 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 kΩ 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 KΩ
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
PROCESSOR GEOMETRY
SHRINKS.
Figure 2. 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 KΩ
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
PROCESSOR GEOMETRY
SHRINKS.
Figure 3. Uni-directional up translation, to higher voltage chip sets
Philips Semiconductors Product data
GTL2000
22-bit bi-directional low voltage translator
2003 Apr 01
6
Sizing pull-up resistor
The pull-up resistor value needs to limit the current through the pass transistor when it is in the “on” state to about 15 mA. This will guarantee a
pass voltage of 260 to 350 mV. If the current through the pass transistor is higher than 15 mA, the pass voltage will also be higher in the “on”
state. To set the current through each pass transistor at 15 mA, the pull-up resistor value is calculated as follows:
Resistor value (W) +
Pull-up voltage (V)*0.35 V
0.015 A
The table below summarizes resistor values for various reference voltages and currents at 15 mA and also at 10 mA and 3 mA. The resistor
value shown in the +10% column or a larger value should be used to ensure that the pass voltage of the transistor would be 350 mV or less.
The external driver must be able to sink the total current from the resistors on both sides of the GTL-TVC device at 0.175 V, although the 15 mA
only applies to current flowing through the GTL-TVC device. See Application Note AN10145-01 Bi-Directional Voltage Translators for more
information.
PULL UP RESISTOR VALUES
PULL UP RESISTOR VALUE (OHMS)
15 mA 10 mA 3 mA
VOLTAGE
NOMINAL + 10 % NOMINAL + 10 % NOMINAL + 10 %
5.0 V 310 341 465 512 1550 1705
3.3 V 197 217 295 325 983 1082
2.5 V 143 158 215 237 717 788
1.8 V 97 106 145 160 483 532
1.5 V 77 85 115 127 383 422
1.2 V 57 63 85 94 283 312
NOTES:
1. Calculated for V
OL
= 0.35 V
2. Assumes output driver V
OL
= 0.175 V at stated current
3. +10% to compensate for V
DD
range and resistor tolerance.
ABSOLUTE MAXIMUM RATINGS
1,
2,
3
SYMBOL PARAMETER CONDITIONS RATING UNIT
V
SREF
DC source reference voltage -0.5 to +7.0 V
V
DREF
DC drain reference voltage -0.5 to +7.0 V
V
GREF
DC gate reference voltage -0.5 to +7.0 V
V
Sn
DC voltage Port S
n
-0.5 to +7.0 V
V
Dn
DC voltage Port D
n
-0.5 to +7.0 V
I
REFK
DC diode current on reference pins V
I
< 0 -50 mA
I
SK
DC diode current Port S
n
V
I
< 0 -50 mA
I
DK
DC diode current Port D
n
V
I
< 0 -50 mA
I
MAX
DC clamp current per channel Channel in ON-state ±128 mA
T
stg
Storage temperature range -65 to +150 °C
NOTES:
1. Stresses beyond those listed may cause permanent damage to the device. These are stress ratings only and functional operation of the
device at these or any other conditions beyond those indicated under “recommended operating conditions” is not implied. Exposure to
absolute-maximum-rated conditions for extended periods may affect device reliability.
2. The performance capability of a high-performance integrated circuit in conjunction with its thermal environment can create junction
temperatures which are detrimental to reliability. The maximum junction temperature of this integrated circuit should not exceed 150 °C.
3. The input and output negative voltage ratings may be exceeded if the input and output clamp current ratings are observed.
P1-P3P4-P6P7-P9P10-P12P13-P13

GTL2000DL,518

Mfr. #:
Buy GTL2000DL,518
Manufacturer:
NXP Semiconductors
Description:
IC TRNSLTR BIDIRECTIONAL 48SSOP
Lifecycle:
New from this manufacturer.
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