Datasheet

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Recommended Operating Conditions
(1) (2) (3) (4)
SN74GTLPH306
8-BIT LVTTL-TO-GTLP BUS TRANSCEIVER
SCES284E – OCTOBER 1999 – REVISED APRIL 2005
MIN NOM MAX UNIT
V
CC
Supply voltage 3.15 3.3 3.45 V
GTL 1.14 1.2 1.26
V
TT
Termination voltage V
GTLP 1.35 1.5 1.65
GTL 0.74 0.8 0.87
V
REF
Reference voltage V
GTLP 0.87 1 1.1
B port V
TT
V
I
Input voltage V
Except B port V
CC
5.5
B port V
REF
+ 0.05
V
IH
High-level input voltage V
Except B port 2
B port V
REF
– 0.05
V
IL
Low-level input voltage V
Except B port 0.8
I
IK
Input clamp current –18 mA
I
OH
High-level output current A port –24 mA
A port 24
I
OL
Low-level output current mA
B port 50
∆ t/ ∆ v Input transition rise or fall rate Outputs enabled 10 ns/V
∆ t/ ∆ V
CC
Power-up ramp rate 20 µ s/V
T
A
Operating free-air temperature –40 85 °C
(1) All unused inputs of the device must be held at V
CC
or GND to ensure proper device operation. Refer to the TI application report,
Implications of Slow or Floating CMOS Inputs, literature number SCBA004.
(2) Proper connection sequence for use of the B-port I/O precharge feature is GND and BIAS V
CC
= 3.3 V first, I/O second, and V
CC
= 3.3 V
last, because the BIAS V
CC
precharge circuitry is disabled when any V
CC
pin is connected. The control and V
REF
inputs can be
connected anytime, but normally are connected during the I/O stage. If B-port precharge is not required, any connection sequence is
acceptable, but generally, GND is connected first.
(3) V
TT
and R
TT
can be adjusted to accommodate backplane impedances if the dc recommended I
OL
ratings are not exceeded.
(4) V
REF
can be adjusted to optimize noise margins, but normally is two-thirds V
TT
. TI-OPC circuitry is enabled in the A-to-B direction and is
activated when V
TT
> 0.7 V above V
REF
. If operated in the A-to-B direction, V
REF
should be set to within 0.6 V of V
TT
to minimize current
drain.
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