®
74LCX16244A
LOW VOLTAGE CMOS 16-BIT BUS BUFFER (3-STATE)
WITH 5V TOLERANT INPUTS AND OUTPUTS
s
s
s
s
s
s
s
s
s
s
5V TOLERANT INPUTS AND OUTPUTS
HIGH SPEED:
t
PD
= 5.2 ns (MAX.) at V
CC
= 3.0V
POWER-DOWN PROTECTION ON INPUTS
AND OUTPUTS
SYMMETRICAL OUTPUT IMPEDANCE:
|I
OH
| = I
OL
= 24 mA (MIN)
PCI BUS LEVELS GUARANTEED AT 24mA
BALANCED PROPAGATION DELAYS:
t
PLH
≅
t
PHL
OPERATING VOLTAGE RANGE:
V
CC
(OPR) = 2.7V to 3.6V (1.5V Data Retention)
PIN AND FUNCTION COMPATIBLE WITH
74 SERIES 16244
LATCH-UP PERFORMANCE EXCEEDS 500mA
ESD PERFORMANCE:
HBM >2000V; MM > 200V
T
(TSSOP48 Package)
ORDER CODES :
74LCX16244AT
PIN CONNECTION
DESCRIPTION
The LCX16244A is a low voltage CMOS 16-BIT
BUS BUFFER (NON-INVERTED) fabricated with
sub-micron silicon gate and double-layer metal
wiring C
2
MOS technology. It is ideal for low
power and high speed 3.3V applications; it can
be interfaced to 5V signal environment for both
inputs and outputs.
Any nG output control governs four BUS
BUFFERS. Output Enable input (nG) tied
together gives full 16-bit operation.
When nG is LOW, the outputs are on. When nG
is HIGH, the output are in high impedance state.
This device is designed to be used with 3 state
memory address drivers, etc.
It has better speed performance at 3.3V than 5V
LSTTL family combined with the true CMOS low
power consumption.
All inputs and outputs are equipped with
protection circuits against static discharge, giving
them 2KV ESD immunity and transient excess
voltage.
February 1999
1/8
74LCX16244A
INPUT AND OUTPUT EQUIVALENT CIRCUIT
PIN DESCRIPTION
PIN No
1
2, 3, 5, 6
8, 9, 11, 12
13, 14, 16, 17
19, 20, 22, 23
24
25
30, 29, 27, 26
36, 35, 33, 32
41, 40, 38, 37
47, 46, 44, 43
48
4,10, 15, 21,
28, 34, 39, 45
7, 18, 31, 42
SYMBOL
1G
1Y1 to 1Y4
2Y1 to 2Y4
3Y1 to 3Y4
4Y1 to 4Y4
4G
3G
4A1 to 4A4
3A1 to 3A4
2A1 to 2A4
1A1 to 1A4
2G
GND
V
CC
NAME AND FUNCT ION
Output Enable Input
Data Outputs
Data Outputs
Data Outputs
Data Outputs
Output Enable Input
Output Enable Input
Data Inputs
Data Inputs
Data Inputs
Data Inputs
Output Enable Input
Ground (0V)
Positive Supply Voltage
IEC LOGIC SYMBOLS
TRUTH TABLE
INPUT
G
L
L
H
X:”H” or ”L”
Z: High impedance
OUTPUT
An
L
H
X
Yn
L
H
Z
2/8
74LCX16244A
ABSOLUTE MAXIMUM RATINGS
Symbol
V
CC
V
I
V
O
V
O
I
IK
I
OK
I
O
I
CC
orI
GND
T
stg
T
L
Supply Voltage
DC Input Voltage
DC Output Voltage (OFF state)
DC Output Voltage (High or Low State) (note1)
DC Input Diode Current
DC Output Diode Current (note2)
DC Output Source/Sink Current
DC V
CC
or Ground Current Per Supply Pin
Storage Temperature
Lead Temperature (10 sec)
Parameter
Value
-0.5 to + 7.0
-0.5 to + 7.0
-0.5 to + 7.0
-0.5 to V
CC
+ 0.5
- 50
±
50
±
50
±
100
-65 to +150
300
Unit
V
V
V
V
mA
mA
mA
mA
o
o
C
C
Absolute Maximum Ratings are those values beyond which damage to the device may occur. Functional operation under these condition is not implied.
1) I
O
absolute maximum rating must be observed
2) V
O
< GND, V
O
> V
CC
RECOMMENDED OPERATING CONDITIONS
Symbol
V
CC
V
I
V
O
V
O
I
OH
, I
OL
I
OH
, I
OL
T
op
dt/dv
Input Voltage
Output Voltage (OFF state)
Output Voltage (High or Low State)
High or Low Level Output Current (V
CC
= 3.0 to 3.6V)
High or Low Level Output Current (V
CC
= 2.7 to 3.0V)
Operating Temperature:
Input Transition Rise or Fall Rate (V
CC
= 3.0V) (note 2)
Parameter
Supply Voltage (note 1)
Value
2.0 to 3.6
0 to 5.5
0 to 5.5
0 to V
CC
±
24
±
12
-40 to+85
0 to 10
Unit
V
V
V
V
mA
mA
o
C
ns/V
1) Truth Table guaranteed: 1.5V to3.6V
2) V
IN
from0.8V to 2.0V
3/8
74LCX16244A
DC SPECIFICATIONS
Symb ol
Parameter
V
CC
(V)
V
IH
V
IL
V
OH
High Level Input Voltage
Low Level Input Voltage
High Level Output Voltage
2.7 to 3.6
2.7 to 3.6
2.7
3.0
V
OL
Low Level Output Voltage
2.7 to 3.6
2.7
3.0
3.0
I
I
I
OZ
I
off
I
CC
Input Leakage Current
3 State Output Leakage Current
Power Off Leakage Current
Quiescent Supply Current
2.7 to 3.6
2.7 to 3.6
0
2.7 to 3.6
V
I
= V
IH
or V
IL
V
I
= V
IH
or V
IL
I
O
=-100
µA
I
O
=-12 mA
I
O
=-18 mA
I
O
=-24 mA
I
O
=100
µA
I
O
=12 mA
I
O
=16 mA
I
O
=24 mA
V
I
= 0 to 5.5 V
V
I
= V
IH
orV
IL
V
O
= 0 to 5.5V
V
I
orV
O
= 5.5V(per pin)
V
I
= V
CC
orGND
V
I
orV
O
=
3.6 to 5.5V
∆I
CC
ICC incr. per input
2.7 to 3.6
V
IH
= V
CC
-0.6V
Test Co nditi ons
Value
-40 to 85 C
Min.
2.0
0.8
V
CC
-0.2
2.2
2.4
2.2
0.2
0.4
0.4
0.55
±5
±5
10
20
±
20
500
µA
µA
µA
µA
µA
V
V
Max.
V
V
o
Un it
DYNAMIC SWITCHING CHARACTERISTICS
Symb ol
Parameter
V
CC
(V)
V
OLP
V
OLV
Dynamic Low Voltage Quiet Output
(note 1)
3.3
C
L
= 50 pF
V
IL
= 0 V
V
IH
= 3.3V
Test Con dition s
Min .
Value
T
A
= 25 C
T yp.
0.8
-0.8
V
Max.
o
Un it
1) Number ofoutputs defined as ”n”. Measured with”n-1” outputs switching from HIGH to LOW or LOW t o HIGH. The remaining output is measured in
the LOW state.
4/8
74LCX16244A
AC ELECTRICAL CHARACTERISTICS
(C
L
= 50 pF, R
L
= 500
Ω,
Input t
r
= t
f
= 2.5 ns)
Symb ol
Parameter
V
CC
(V)
t
PLH
t
PHL
t
PZL
t
PZH
t
PLZ
t
PHZ
t
OSLH
t
OSHL
Propagation Delay Time
Output Enable Time
Output Disable Time
Output to Output Skew Time (note 1, 2)
2.7
3.0 to 3.6
2.7
3.0 to 3.6
2.7
3.0 to 3.6
3.0 to 3.6
Test Con dition
Waveform
Value
-40 to 85
o
C
Min.
1.5
1.5
1.5
1.5
1.5
1.5
Max.
6.2
5.2
7.5
6.5
6.5
5.5
1.0
Un it
1
2
2
ns
ns
ns
ns
1) Skew is defined as the absolute value of the difference between the actual propagation delay for any twooutputs of the same device switching in the
same direction, either HIGH or LOW (t
OSLH
= |t
PLHm
- t
PLHn
|, t
OSHL
= |t
PHLm
- t
pHLn
|)
2) Parameter guaranteed by design
CAPACITIVE CHARACTERISTICS
Symb ol
Parameter
V
CC
(V)
C
IN
C
OUT
C
PD
Input Capacitance
Output Capacitance
Power Dissipation Capacitance (note 1)
3.3
3.3
3.3
V
IN
= 0 to V
CC
V
IN
= 0 to V
CC
f
IN
= 10MHz
V
IN
= 0 or V
CC
Test Co nditi ons
Min.
Valu e
T
A
= 25 C
T yp.
7
8
20
Max.
pF
pF
pF
o
Un it
1) C
PD
isdefined as the value of the IC’sinternal equivalent capacitance which is calculated fromthe operating current consumption without load. Average
operting current can be obtained by the following equation. I
CC
(opr) = C
PD
•
V
CC
•
f
IN
+ I
CC
/16 (per circuit)
TEST CIRCUIT
T EST
t
PLH
, t
PHL
t
PZL
, t
PLZ
t
PZH
, t
PHZ
C
L
= 50 pF or equivalent (includes jigand probe capacitance)
R
L
= R
1
= 500Ω orequivalent
R
T
= Z
OUT
of pulse generator (typically 50
Ω
)
SW IT CH
Open
6V
GND
5/8
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
