Datasheet

SN74GTL16923
18-BIT LVTTL-TO-GTL/GTL+ BUS TRANSCEIVER
SCBS674G – AUGUST 1996 – REVISED AUGUST 2001
2–44
POST OFFICE BOX 655303 • DALLAS, TEXAS 75265
absolute maximum ratings over operating free-air temperature range (unless otherwise noted)
†
Supply voltage range, V
CC
–0.5 V to 4.6 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input voltage range, V
I
(see Note 1) –0.5 V to 7 V. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Voltage range applied to any output in the high or power-off state, V
O
(see Note 1) –0.5 V to 7 V. . . . . . . . .
Current into any output in the low state, I
O
: A port 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
B port 100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Current into any A-port output in the high state, I
O
(see Note 2) 48 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Continuous current through each V
CC
or GND ±100 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Input clamp current, I
IK
(V
I
< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Output clamp current, I
OK
(V
O
< 0) –50 mA. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Package thermal impedance, θ
JA
(see Note 3) 55°C/W. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
Storage temperature range, T
stg
–65°C to 150°C. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
†
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.
NOTES: 1. The input and output negative-voltage ratings may be exceeded if the input and output clamp-current ratings are observed.
2. This current flows only when the output is in the high state and V
O
> V
CC
.
3. The package thermal impedance is calculated in accordance with JESD 51-7.
recommended operating conditions (see Notes 4 through 7)
MIN NOM MAX UNIT
V
CC
Supply voltage 3.15 3.3 3.45 V
V
TT
Termination voltage
GTL 1.14 1.2 1.26
V
V
TT
Termination
v
oltage
GTL+ 1.35 1.5 1.65
V
V
REF
Reference voltage
GTL 0.74 0.8 0.87
V
V
REF
Reference
v
oltage
GTL+ 0.87 1 1.1
V
V
I
In
p
ut voltage
B port 0 V
TT
V
V
I
Inp
u
t
v
oltage
Except B port 0 5.5
V
V
IH
High level in
p
ut voltage
B port V
REF
+50 mV
V
V
IH
High
-
le
v
el
inp
u
t
v
oltage
Except B port 2
V
V
IL
Low level in
p
ut voltage
B port V
REF
–50 mV
V
V
IL
Lo
w-
le
v
el
inp
u
t
v
oltage
Except B port 0.8
V
I
IK
Input clamp current –18 mA
I
OH
High-level output current A port –24 mA
I
OL
Low level out
p
ut current
A port 24
mA
I
OL
Lo
w-
le
v
el
o
u
tp
u
t
c
u
rrent
B port 50
mA
T
A
Operating free-air temperature –40 85 °C
NOTES: 4. All unused control 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.
5. Normal connection sequence is GND first, V
CC
= 3.3 V, I/O, control inputs, V
TT
, V
REF
(any order) last.
6. V
TT
and R
TT
can be adjusted to accommodate backplane impedances if the dc recommended I
OL
ratings are not exceeded.
7. V
REF
can be adjusted to optimize noise margins, but normally is two-thirds V
TT
.