Philips Semiconductors
Product Specification
16-bit buffer/line driver; 3.6 V tolerant;
3-state
FEATURES
•
Wide supply voltage range from 1.2 to 3.6 V
•
Complies with JEDEC standard no. 8-1A/5/7
•
CMOS low power consumption
•
Input/output tolerant up to 3.6 V
•
Dynamic Controlled Output (DCO) circuit dynamically
changes the output impedance, resulting in noise
reduction without speed degradation
•
Low inductance multiple V
CC
and GND pins to minimize
noise and ground bounce
•
Supports Live Insertion
•
All data inputs have bus-hold.
DESCRIPTION
74AVCH16244
The 74AVCH16244 is a 16-bit non-inverting buffer/line
driver with 3-state outputs. The device can be used as four
4-bit buffers, two 8-bit buffers or one 16-bit buffer.
The 3-state outputs are controlled by the output enable
inputs nOE. A HIGH on nOE causes the outputs to assume
a high impedance OFF-state.
The 74AVCH16244 is designed to have an extremely fast
propagation delay and a minimum amount of power
consumption.
To ensure the high-impedance output state during
power-up or power-down, nOE should be tied to V
CC
through a pull-up resistor (Live Insertion).
A Dynamic Controlled Output (DCO) circuitry is
implemented to support termination line drive during
transient (see Figs 1 and 2).
The 74AVCH16244 has active bus-hold circuitry to hold
unused or floating data inputs at a valid logic level. This
feature eliminates the need for external pull-up or
pull-down resistors.
MNA506
handbook, halfpage
0
MNA507
handbook, halfpage
300
I OH
(mA)
1.8 V
−100
I OL
(mA)
200
2.5 V
2.5 V
3.3 V
−200
100
1.8 V
3.3 V
−300
0
0
1
2
3
VOH (V)
4
0
1
2
3
VOL (V)
4
Fig.1
Output voltage as a function of the
HIGH-level output current.
Fig.2
Output voltage as a function of the
LOW-level output current.
2000 Mar 07
2
Philips Semiconductors
Product Specification
16-bit buffer/line driver; 3.6 V tolerant;
3-state
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°C;
t
r
= t
f
≤
2.0 ns.
SYMBOL
t
PHL
/t
PLH
PARAMETER
propagation delay nA
n
to nY
n
CONDITIONS
V
CC
= 1.2 V
V
CC
= 1.5 V
V
CC
= 1.8 V
V
CC
= 2.5 V
V
CC
= 3.3 V
C
I
C
PD
input capacitance
power dissipation capacitance per buffer notes 1 and 2
outputs enabled
outputs disabled
Notes
1. C
PD
is used to determine the dynamic power dissipation (P
D
in
µW).
P
D
= C
PD
×
V
CC2
×
f
i
+
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in Volts;
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs.
2. The condition is V
I
= GND to V
CC
.
FUNCTION TABLE
See note 1.
INPUTS
nOE
L
L
H
Note
1. H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high impedance OFF-state.
nA
n
L
H
X
74AVCH16244
TYP.
5.2
2.9
2.1
1.5
1.3
5.0
34
1
ns
ns
ns
ns
ns
pF
pF
pF
UNIT
OUTPUTS
nY
n
L
H
Z
2000 Mar 07
3
Philips Semiconductors
Product Specification
16-bit buffer/line driver; 3.6 V tolerant;
3-state
ORDERING AND PACKAGE INFORMATION
PACKAGE
TYPE NUMBER
TEMPERATURE RANGE
74AVCH16244DGG
PINNING
PIN
1
2, 3, 5 and 6
4, 10, 15, 21, 28, 34, 39 and 45
7, 18, 31 and 42
8, 9, 11 and 12
13, 14, 16 and 17
19, 20, 22 and 23
24
25
26, 27, 29 and 30
32, 33, 35 and 36
37, 38, 40 and 41
43, 44, 46 and 47
48
SYMBOL
1OE
1Y
0
to 1Y
3
GND
V
CC
2Y
0
to 2Y
3
3Y
0
to 3Y
3
4Y
0
to 4Y
3
4OE
3OE
4A
3
to 4A
0
3A
3
to 3A
0
2A
3
to 2A
0
1A
3
to 1A
0
2OE
data outputs
ground (0 V)
positive supply voltage
data outputs
data outputs
data outputs
output enable input (active LOW)
output enable input (active LOW)
data inputs
data inputs
data inputs
data inputs
output enable input (active LOW)
−40
to +85
°C
PINS
48
PACKAGE
TSSOP
74AVCH16244
MATERIAL
plastic
CODE
SOT362-1
DESCRIPTION
output enable input (active LOW)
2000 Mar 07
4
单片机
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