March 1998
Revised April 1999
7
4
VC
X16
2827 Low V
o
l
t
age
20-Bi
t Buf
f
e
r
/L
ine Dr
iver
wit
h
3.
6V T
o
le
rant
Inp
u
ts an
d Output
s and
26
Seri
es
Resi
s-
to
r
s
in
th
e
Ou
tp
u
t
s
1999 Fairchild Semiconductor Corporation
DS500138.prf
www.fairchildsemi.com
74VCX162827
Low Voltage 20-Bit Buffer/Line Driver with 3.6V Tolerant
Inputs and Outputs and 26
Series Resistors in the
Outputs
General Description
The VCX162827 contains twenty non-inverting buffers with
3-STATE outputs to be employed as a memory and
address driver, clock driver, or bus oriented transmitter/
receiver. The device is byte controlled. Each byte has NOR
output enables for maximum control flexibility.
The 74VCX162827 is designed for low voltage (1.65V to
3.6V) V
CC
applications with I/O capability up to 3.6V. The
VCX162827 is also designed with 26
resistors in the out-
puts.
The 74VCX162827 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s
1.65V3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
26
series resistors in outputs
s
t
PD
3.4 ns max for 3.0V to 3.6V V
CC
4.1 ns max for 2.3V to 2.7V V
CC
8.2 ns max for 1.65V to 1.95V V
CC
s
Power-off high impedance inputs and outputs
s
Supports live insertion and withdrawal (Note 1)
s
Static Drive (I
OH
/I
OL
)
12 mA @ 3.0V V
CC
8 mA @ 2.3V V
CC
3
mA @
1.65V
V
CC
s
Uses patented noise/EMI reduction circuitry
s
Latch-up performance exceeds 300 mA
s
ESD performance:
Human body model
>
2000V
Machine model
>
200V
Note 1: To ensure the high-impedance state during power up or power
down, OE should be tied to V
CC
through a pull-up resistor; the minimum
value of the resistor is determined by the current-sourcing capability of the
driver.
Ordering Code:
Devices also available in Tape and Reel. Specify by appending the suffix "X" to the ordering code.
Logic Symbol
Pin Descriptions
Order Number
Package Number
Package Description
74VCX162827MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Names
Description
OE
n
Output Enable Input (Active LOW)
I
0
I
19
Inputs
O
0
O
19
Outputs
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2
74VCX162827
Connection Diagram
Truth Tables
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial (HIGH or LOW, inputs may not float)
Z
=
High Impedance
Functional Description
The 74VCX162827 contains twenty non-inverting buffers
with 3-STATE outputs. The device is byte controlled with
each byte functioning identically, but independent of each
other. The control pins may be shorted together to obtain
full 20-bit operation. The 3-STATE outputs are controlled by
Output Enable (OE
n
) inputs. When OE
1
, and OE
2
are
LOW, O
0
O
10
are in the 2-state mode. When either OE
1
or
OE
2
are HIGH, the standard outputs are in the high imped-
ance mode but this does not interfere with entering new
data into the inputs. The same applies for byte two with
OE
3
and OE
4
.
Logic Diagrams
Inputs
Outputs
OE
1
OE
2
I
0
I
9
O
0
O
9
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
Inputs
Outputs
OE
3
OE
4
I
0
I
9
O
10
O
19
L
L
L
L
L
L
H
H
H
X
X
Z
X
H
X
Z
3
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7
4
VC
X16
2827
Absolute Maximum Ratings
(Note 2)
Recommended Operating
Conditions
(Note 4)
Note 2: The Absolute Maximum Ratings are those values beyond which
the safety of the device cannot be guaranteed. The device should not be
operated at these limits. The parametric values defined in the Electrical
Characteristics tables are not guaranteed at the Absolute Maximum Rat-
ings. The "Recommended Operating Conditions" table will define the condi-
tions for actual device operation.
Note 3: I
O
Absolute Maximum Rating must be observed.
Note 4: Floating or unused inputs must be held HIGH or LOW.
DC Electrical Characteristics (2.7V
<
V
CC
3.6V)
Note 5: Outputs disabled or 3-STATE only.
Supply Voltage (V
CC
)
-
0.5V to
+
4.6V
DC Input Voltage (V
I
)
-
0.5V to
+
4.6V
Output Voltage (V
O
)
Outputs 3-STATE
-
0.5V to
+
4.6V
Outputs Active (Note 3)
-
0.5V to V
CC
+
0.5V
DC Input Diode Current (I
IK
) V
I
<
0V
-
50 mA
DC Output Diode Current (I
OK
)
V
O
<
0V
-
50 mA
V
O
>
V
CC
+
50 mA
DC Output Source/Sink Current
(I
OH
/I
OL
)
50 mA
DC V
CC
or GND Current per
Supply Pin (I
CC
or GND)
100 mA
Storage Temperature Range (T
STG
)
-
65
C to
+
150
C
Power Supply
Operating
1.65V to 3.6V
Data Retention Only
1.2V to 3.6V
Input Voltage
-
0.3V to
+
3.6V
Output Voltage (V
O
)
Output in Active States
0V to V
CC
Output in 3-STATE
0.0V to 3.6V
Output Current in I
OH
/I
OL
V
CC
=
3.0V to 3.6V
12 mA
V
CC
=
2.3V to 2.7V
8 mA
V
CC
=
1.65V to 2.3V
3 mA
Free Air Operating Temperature
(T
A
)
-
40
C to
+
85
C
Minimum Input Edge Rate (
t/
V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/V
Symbol
Parameter
Conditions
V
CC
Min
Max
Units
(V)
V
IH
HIGH Level Input Voltage
2.7
-
3.6
2.0
V
V
IL
LOW Level Input Voltage
2.7
-
3.6
0.8
V
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
2.7
-
3.6
V
CC
-
0.2
V
I
OH
=
-
6 mA
2.7
2.2
V
I
OH
=
-
8 mA
3.0
2.4
V
I
OH
=
-
12 mA
3.0
2.2
V
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.7
-
3.6
0.2
V
I
OL
=
6 mA
2.7
0.4
V
I
OL
=
8 mA
3.0
0.55
V
I
OL
=
12 mA
3.0
0.8
V
I
I
Input Leakage Current
0
V
I
3.6V
2.7
-
3.6
5.0
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
2.7
-
3.6
10
A
V
I
=
V
IH
or V
IL
I
OFF
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.7
-
3.6
20
A
V
CC
(V
I
, V
O
)
3.6V (Note 5)
2.7
-
3.6
20
A
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.7
-
3.6
750
A
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4
74VCX162827
DC Electrical Characteristics (2.3V
V
CC
2.7V)
Note 6: Outputs disabled or 3-STATE only.
DC Electrical Characteristics (1.65V
V
CC
<
2.3V)
Note 7: Outputs disabled or 3-STATE only.
Symbol
Parameter
Conditions
V
CC
Min
Max
Units
(V)
V
IH
HIGH Level Input Voltage
2.3
-
2.7
1.6
V
V
IL
LOW Level Input Voltage
2.3
-
2.7
0.7
V
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
2.3
-
2.7
V
CC
-
0.2
V
I
OH
=
-
4 mA
2.3
2.0
V
I
OH
=
-
6 mA
2.3
1.8
V
I
OH
=
-
8 mA
2.3
1.7
V
V
OL
LOW Level Output Voltage
I
OL
=
100
A
2.3
-
2.7
0.2
V
I
OL
=
6 mA
2.3
0.4
V
I
OL
=
8 mA
2.3
0.6
V
I
I
Input Leakage Current
0
V
I
3.6V
2.3
-
2.7
5.0
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
2.3
-
2.7
10
A
V
I
=
V
IH
or V
IL
I
OFF
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.3
-
2.7
20
A
V
CC
(V
I
, V
O
)
3.6V (Note 6)
2.3
-
2.7
20
A
Symbol
Parameter
Conditions
V
CC
Min
Max
Units
(V)
V
IH
HIGH Level Input Voltage
1.65 - 2.3
0.65
V
CC
V
V
IL
LOW Level Input Voltage
1.65 - 2.3
0.35
V
CC
V
V
OH
HIGH Level Output Voltage
I
OH
=
-
100
A
1.65 - 2.3
V
CC
-
0.2
V
I
OH
=
-
3 mA
1.65
1.25
V
V
OL
LOW Level Output Voltage
I
OL
=
100
A
1.65 - 2.3
0.2
V
I
OL
=
3 mA
1.65
0.3
V
I
I
Input Leakage Current
0
V
I
3.6V
1.65 - 2.3
5.0
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
1.65 - 2.3
10
A
V
I
=
V
IH
or V
IL
I
OFF
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
1.65 - 2.3
20
A
V
CC
(V
I
, V
O
)
3.6V (Note 7)
1.65 - 2.3
20
A
5
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7
4
VC
X16
2827
AC Electrical Characteristics
(Note 8)
Note 8: For C
L
=
50
P
F, add approximately 300 ps to the AC maximum specification.
Note 9: Skew is defined as the absolute value of the difference between the actual propagation delay for any two separate outputs of the same device. The
specification applies to any outputs switching in the same direction, either HIGH-to-LOW (t
OSHL
) or LOW-to-HIGH (t
OSLH
).
Dynamic Switching Characteristics
Capacitance
Symbol
Parameter
T
A
=
-
40
C to
+
85
C, C
L
=
30 pF, R
L
=
500
Units
V
CC
=
3.3V
0.3V
V
CC
=
2.5V
0.2V
V
CC
=
1.8V
0.15V
Min
Max
Min
Max
Min
Max
t
PHL
, t
PLH
Prop Delay
0.8
3.4
1.0
4.1
1.5
8.2
ns
t
PZL
, t
PZH
Output Enable Time
0.8
4.3
1.0
5.9
1.5
9.8
ns
t
PLZ
, t
PHZ
Output Disable Time
0.8
4.3
1.0
4.9
1.5
8.8
ns
t
OSHL
Output to Output Skew
0.5
0.5
0.75
ns
t
OSLH
(Note 9)
Symbol
Parameter
Conditions
V
CC
T
A
=
+
25
C
Units
(V)
Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
0.15
2.5
0.25
V
3.3
0.35
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
-
0.15
2.5
-
0.25
V
3.3
-
0.35
V
OHV
Quiet Output Dynamic Valley V
OH
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
1.55
2.5
2.05
V
3.3
2.65
Symbol
Parameter
Conditions
T
A
=
+
25
C
Units
Typical
C
IN
Input Capacitance
V
CC
=
1.8, 2.5V or 3.3V, V
I
=
0V or V
CC
6
pF
C
OUT
Output Capacitance
V
I
=
0V or V
CC
, V
CC
=
1.8V, 2.5V or 3.3V
7
pF
C
PD
Power Dissipation Capacitance
V
I
=
0V or V
CC
, f
=
10 MHz, V
CC
=
1.8V, 2.5V or 3.3V
20
pF
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