Datasheet

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Absolute Maximum Ratings
(1)
Recommended Operating Conditions
(1) (2) (3) (4)
SN54GTL16612, SN74GTL16612
18-BIT LVTTL-TO-GTL/GTL+ UNIVERSAL BUS TRANSCEIVERS
SCBS480K – JUNE 1994 – REVISED JULY 2005
over operating free-air temperature range (unless otherwise noted)
MIN MAX UNIT
3.3 V –0.5 4.6
V
CC
Supply voltage range V
5 V –0.5 7
A-port and control inputs –0.5 7
V
I
Input voltage range
(2)
V
B port and V
REF
–0.5 4.6
A port –0.5 7
V
O
Voltage range applied to any output in the high or power-off state
(2)
V
B port –0.5 4.6
A port 128
I
O
Current into any output in the low state mA
B port 80
I
O
Current into any A-port output in the high state
(3)
64 mA
Continuous current through each V
CC
or GND ± 100 mA
I
IK
Input clamp current V
I
< 0 –50 mA
I
OK
Output clamp current V
O
< 0 –50 mA
DGG package 64
θ
JA
Package thermal impedance
(4)
° C/W
DL package 56
T
stg
Storage temperature range –65 150 ° C
(1) Stresses beyond those listed under "absolute maximum ratings" 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 input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
(3) This current flows only when the output is in the high state and V
O
> V
CC
.
(4) The package thermal impedance is calculated in accordance with JESD 51-7.
SN54GTL16612 SN74GTL16612
UNIT
MIN NOM MAX MIN NOM MAX
3.3 V 3.15 3.3 3.45 3.15 3.3 3.45
V
CC
Supply voltage V
5 V 4.75 5 5.25 4.75 5 5.25
GTL 1.14 1.2 1.26 1.14 1.2 1.26
Termination
V
TT
V
voltage
GTL+ 1.35 1.5 1.65 1.35 1.5 1.65
GTL 0.74 0.8 0.87 0.74 0.8 0.87
V
REF
Reference voltage V
GTL+ 0.87 1 1.1 0.87 1 1.1
B port V
TT
V
TT
V
I
Input voltage V
Except B port 5.5 5.5
B port V
REF
+ 50 mV V
REF
+ 50 mV
High-level
V
IH
V
input voltage
Except B port 2 2
B port V
REF
– 50 mV V
REF
– 50 mV
Low-level
V
IL
V
input voltage
Except B port 0.8 0.8
I
IK
Input clamp current –18 –18 mA
High-level
I
OH
A port –32 –32 mA
output current
A port 64 64
Low-level
I
OL
mA
output current
B port 40 40
T
A
Operating free-air temperature –55 125 –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) Normal connection sequence is GND first, V
CC
= 5 V second, and V
CC
= 3.3 V, I/O, control inputs, V
TT
and V
REF
(any order) last.
(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
.
4