74AC16244
16-BIT BUS BUFFER
WITH 3-STATE OUTPUTS (NON INVERTED)
s
s
s
s
s
s
s
s
s
HIGH SPEED:
t
PD
= 4.5 ns (TYP.) at V
CC
= 5V
LOW POWER DISSIPATION:
I
CC
= 8
µA
(MAX.) at T
A
=25°C
HIGH NOISE IMMUNITY:
V
NIH
= V
NIL
= 28% V
CC
(MIN.)
POWER DOWN PROTECTION ON INPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2V to 6V
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 16244
IMPROVED LATCH-UP IMMUNITY
TSSOP
ORDER CODES
PACKAGE
TSSOP
TUBE
PIN CONNECTION
DESCRIPTION
The 74AC16244 is an advanced high-speed
CMOS 16-BIT BUS BUFFER (3-STATE) fabricat-
ed with sub-micron silicon gate and double-layer
metal wiring C
2
MOS tecnology.
Any nG output control governs four BUS
BUFFERS. Output Enable inputs (nG) tied
together give full 16 bit operation.
When nG is LOW, the outputs are enabled. When
nG is HIGH, the output are in high impedance
state.
The device is designed to be used with 3-state
memory address drivers, etc.
O
so
b
te
le
r
P
uc
od
s)
t(
bs
-O
et
l
o
P
e
od
r
s)
t(
uc
T&R
74AC16244TTR
February 2003
1/9
74AC16244
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
I
IK
I
OK
I
O
Supply Voltage
DC Input Voltage
DC Output Voltage
DC Input Diode Current
DC Output Diode Current
DC Output Current
Parameter
Value
-0.5 to +7.0
-0.5 to +7.0
-0.5 to V
CC
+ 0.5
±
20
±
50
±
50
±
400
-65 to +150
300
Unit
V
V
V
mA
mA
mA
mA
°C
°C
I
CC
or I
GND
DC V
CC
or Ground Current
Storage Temperature
T
stg
T
L
Lead Temperature (10 sec)
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these conditions is
not implied
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
T
op
dt/dv
Supply Voltage
Input Voltage
Output Voltage
Operating Temperature
Input Rise and Fall Time (note 1) V
CC
= 3.0, 4.5 or 5.5
Parameter
Value
2 to 6
0 to V
CC
1) V
IN
from 30% to 70% of V
CC
O
so
b
te
le
r
P
uc
od
s)
t(
so
b
-O
te
le
r
P
0 to V
CC
0 to 8
-55 to 125
od
s)
t(
uc
Unit
V
V
V
°C
ns/V
3/9
74AC16244
DC SPECIFICATIONS
Test Condition
Symbol
Parameter
V
CC
(V)
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
3.0
4.5
5.5
V
OL
Low Level Output
Voltage
3.0
4.5
5.5
3.0
4.5
I
I
I
OZ
Input Leakage
Current
High Impedance
Output Leakage
Current
Quiescent Supply
Current
5.5
5.5
5.5
V
O
= 0.1 V or
V
CC
-0.1V
V
O
= 0.1 V or
V
CC
-0.1V
I
O
=-50
µA
I
O
=-50
µA
I
O
=-50
µA
I
O
=-12 mA
I
O
=-24 mA
I
O
=-24 mA
I
O
=50
µA
I
O
=50
µA
I
O
=50
µA
I
O
=12 mA
I
O
=24 mA
V
I
= V
CC
or GND
V
I
= V
IH
or V
IL
V
O
= V
CC
or GND
V
I
= V
CC
or GND
2.9
4.4
5.4
2.56
3.86
4.86
0.002
0.001
0.001
0.1
0.1
0.1
0.36
0.36
T
A
= 25 °C
Min.
2.1
3.15
3.85
Typ.
1.5
2.25
2.75
1.5
2.25
2.75
2.99
4.49
5.49
Max.
Value
-40 to 85°C
Min.
2.1
3.15
3.85
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
0.1
0.1
0.1
0.9
1.35
1.65
2.9
4.4
5.4
2.46
3.76
4.76
V
Max.
-55 to 125°C
Min.
2.1
3.15
3.85
0.9
1.35
1.65
Max.
V
Unit
V
IH
High Level Input
Voltage
Low Level Input
Voltage
High Level Output
Voltage
V
IL
V
V
OH
I
CC
AC ELECTRICAL CHARACTERISTICS
( C
L
= 50 pF, R
L
= 500
Ω,
Input t
r
= t
f
= 3n)
Symbol
Parameter
b
O
t
PLH
t
PHL
Propagation Delay
Time
A to Y
t
PZL
t
PZH
Output Enable
Time
so
te
le
r
P
uc
od
V
CC
(V)
3.3
(*)
5.0
(**)
3.3
(*)
5.0
(**)
3.3
(*)
5.0
(**)
s)
t(
bs
-O
Min.
et
l
o
8
±
0.1
P
e
od
r
0.44
0.44
±
1
±
5
80
s)
t(
uc
0.1
0.1
0.1
0.44
0.44
±
1
±
5
80
µA
µA
µA
V
±
0.5
Test Condition
C
L
(pF)
T
A
= 25°C
Typ.
6
4.5
8
5.5
7.3
5.5
Max.
8.5
7.0
10.5
8.0
9.0
8.0
Value
-40 to 85°C
Min.
Max.
11.5
9.0
14.0
10.0
11.5
14.0
-55 to 125°C
Min.
Max.
11.5
9.0
14.0
10.0
11.5
14.0
ns
Unit
ns
t
PLZ
t
PHZ
Output Disable
Time
ns
(*) Voltage range is 3.3V
±
0.3V
(**) Voltage range is 5.0V
±
0.5V
4/9
74AC16244
CAPACITIVE CHARACTERISTICS
Test Condition
Symbol
Parameter
V
CC
(V)
T
A
= 25°C
Min.
Typ.
7
14
5.0
f
IN
= 10MHz
25
Max.
10
Value
-40 to 85°C
Min.
Max.
10
-55 to 125°C
Min.
Max.
10
pF
pF
pF
Unit
C
IN
C
OUT
C
PD
Input Capacitance
Output
Capacitance
Power Dissipation
Capacitance
(note 1)
1) C
PD
is defined as the value of the IC’s internal equivalent capacitance which is calculated from the operating current consumption without
load. (Refer to Test Circuit). Average operating current can be obtained by the following equation. I
CC(opr)
= C
PD
x V
CC
x f
IN
+ I
CC
/ 16(per
Latch)
TEST CIRCUIT
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
C
L
= 50 pF or equivalent (includes jig and probe capacitance)
R
L
= R1 = 500Ω or equivalent
R
T
= Z
OUT
of pulse generator (typically 50Ω)
O
so
b
te
le
r
P
uc
od
TEST
s)
t(
bs
-O
et
l
o
P
e
od
r
s)
t(
uc
SWITCH
Open
V
CC
GND
5/9
Analog electronics
京公网安备 11010802033920号
EEWORLD
