74VCX162827 Low Voltage 20-Bit Buffer/Line Driver with 3.6V Tolerant Inputs and Outputs and 26Ω Series Resis-
tors in the Outputs
March 1998
Revised April 1999
74VCX162827
Low Voltage 20-Bit Buffer/Line Driver with 3.6V Tolerant
Inputs and Outputs and 26Ω 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 26Ω 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
1.65V–3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
26Ω 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:
Order Number
74VCX162827MTD
Package Number
MTD56
Package Description
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Devices also available in Tape and Reel. Specify by appending the suffix “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
OE
n
I
0
–I
19
O
0
–O
19
Description
Output Enable Input (Active LOW)
Inputs
Outputs
© 1999 Fairchild Semiconductor Corporation
DS500138.prf
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74VCX162827
Connection Diagram
Truth Tables
Inputs
OE
1
L
L
H
X
OE
2
L
L
X
H
Inputs
OE
3
L
L
H
X
OE
4
L
L
X
H
I
0
–I
9
L
H
X
X
I
0
–I
9
L
H
X
X
Outputs
O
0
–O
9
L
H
Z
Z
Outputs
O
10
–O
19
L
H
Z
Z
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
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2
74VCX162827
Absolute Maximum Ratings
(Note 2)
Supply Voltage (V
CC
)
DC Input Voltage (V
I
)
Output Voltage (V
O
)
Outputs 3-STATE
Outputs Active (Note 3)
DC Input Diode Current (I
IK
) V
I
<
0V
DC Output Diode Current (I
OK
)
V
O
<
0V
V
O
>
V
CC
DC Output Source/Sink Current
(I
OH
/I
OL
)
DC V
CC
or GND Current per
Supply Pin (I
CC
or GND)
Storage Temperature Range (T
STG
)
±100
mA
−65°C
to
+150°C
±50
mA
−50
mA
+50
mA
−0.5V
to
+4.6V
−0.5V
to V
CC
+
0.5V
−50
mA
−0.5V
to
+4.6V
−0.5V
to
+4.6V
Recommended Operating
Conditions
(Note 4)
Power Supply
Operating
Data Retention Only
Input Voltage
Output Voltage (V
O
)
Output in Active States
Output in 3-STATE
Output Current in I
OH
/I
OL
V
CC
=
3.0V to 3.6V
V
CC
=
2.3V to 2.7V
V
CC
=
1.65V to 2.3V
Free Air Operating Temperature
(T
A
)
Minimum Input Edge Rate (∆t/∆V)
V
IN
=
0.8V to 2.0V, V
CC
=
3.0V
10 ns/V
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.
1.65V to 3.6V
1.2V to 3.6V
−0.3V
to
+3.6V
0V to V
CC
0.0V to 3.6V
±12
mA
±8
mA
±3
mA
−40°C
to
+85°C
DC Electrical Characteristics (2.7V
<
V
CC
≤
3.6V)
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −6
mA
I
OH
= −8
mA
I
OH
= −12
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
6 mA
I
OL
=
8 mA
I
OL
=
12 mA
I
I
I
OZ
I
OFF
I
CC
∆I
CC
Input Leakage Current
3-STATE Output Leakage
Power-OFF Leakage Current
Quiescent Supply Current
Increase in I
CC
per Input
0
≤
V
I
≤
3.6V
0
≤
V
O
≤
3.6V
V
I
=
V
IH
or V
IL
0
≤
(V
I
, V
O
)
≤
3.6V
V
I
=
V
CC
or GND
V
CC
≤
(V
I
, V
O
)
≤
3.6V (Note 5)
V
IH
=
V
CC
−0.6V
Note 5:
Outputs disabled or 3-STATE only.
Conditions
V
CC
(V)
2.7
−
3.6
2.7
−
3.6
2.7
−
3.6
2.7
3.0
3.0
2.7
−
3.6
2.7
3.0
3.0
2.7
−
3.6
2.7
−
3.6
0
2.7
−
3.6
2.7
−
3.6
2.7
−
3.6
Min
2.0
Max
Units
V
0.8
V
CC
−
0.2
2.2
2.4
2.2
0.2
0.4
0.55
0.8
±5.0
±10
10
20
±20
750
V
V
V
V
V
V
V
V
V
µA
µA
µA
µA
µA
µA
3
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74VCX162827
DC Electrical Characteristics (2.3V
≤
V
CC
≤
2.7V)
Symbol
V
IH
V
IL
V
OH
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
I
OH
= −100 µA
I
OH
= −4
mA
I
OH
= −6
mA
I
OH
= −8
mA
V
OL
LOW Level Output Voltage
I
OL
=
100
µA
I
OL
=
6 mA
I
OL
=
8 mA
I
I
I
OZ
I
OFF
I
CC
Input Leakage Current
3-STATE Output Leakage
Power-OFF Leakage Current
Quiescent Supply Current
0
≤
V
I
≤
3.6V
0
≤
V
O
≤
3.6V
V
I
=
V
IH
or V
IL
0
≤
(V
I
, V
O
)
≤
3.6V
V
I
=
V
CC
or GND
V
CC
≤
(V
I
, V
O
)
≤
3.6V (Note 6)
Note 6:
Outputs disabled or 3-STATE only.
Conditions
V
CC
(V)
2.3
−
2.7
2.3
−
2.7
2.3
−
2.7
2.3
2.3
2.3
2.3
−
2.7
2.3
2.3
2.3
−
2.7
2.3
−
2.7
0
2.3
−
2.7
2.3
−
2.7
Min
1.6
Max
Units
V
0.7
V
CC
−
0.2
2.0
1.8
1.7
0.2
0.4
0.6
±5.0
±10
10
20
±20
V
V
V
V
V
V
V
V
µA
µA
µA
µA
µA
DC Electrical Characteristics (1.65V
≤
V
CC
<
2.3V)
Symbol
V
IH
V
IL
V
OH
V
OL
I
I
I
OZ
I
OFF
I
CC
Parameter
HIGH Level Input Voltage
LOW Level Input Voltage
HIGH Level Output Voltage
LOW Level Output Voltage
Input Leakage Current
3-STATE Output Leakage
Power-OFF Leakage Current
Quiescent Supply Current
I
OH
= −100 µA
I
OH
= −3
mA
I
OL
=
100
µA
I
OL
=
3 mA
0
≤
V
I
≤
3.6V
0
≤
V
O
≤
3.6V
V
I
=
V
IH
or V
IL
0
≤
(V
I
, V
O
)
≤
3.6V
V
I
=
V
CC
or GND
V
CC
≤
(V
I
, V
O
)
≤
3.6V (Note 7)
Note 7:
Outputs disabled or 3-STATE only.
Conditions
V
CC
(V)
1.65 - 2.3
1.65 - 2.3
1.65 - 2.3
1.65
1.65 - 2.3
1.65
1.65 - 2.3
1.65 - 2.3
0
1.65 - 2.3
1.65 - 2.3
Min
0.65
×
V
CC
Max
Units
V
0.35
×
V
CC
V
CC
−
0.2
1.25
0.2
0.3
±5.0
±10
10
20
±20
V
V
V
V
V
µA
µA
µA
µA
µA
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4
74VCX162827
AC Electrical Characteristics
(Note 8)
T
A
= −40°C
to
+85°C,
C
L
=
30 pF, R
L
=
500Ω
Symbol
Parameter
V
CC
=
3.3V
±
0.3V
Min
t
PHL
, t
PLH
t
PZL
, t
PZH
t
PLZ
, t
PHZ
t
OSHL
t
OSLH
Prop Delay
Output Enable Time
Output Disable Time
Output to Output Skew
(Note 9)
0.8
0.8
0.8
Max
3.4
4.3
4.3
0.5
V
CC
=
2.5V
±
0.2V
Min
1.0
1.0
1.0
Max
4.1
5.9
4.9
0.5
V
CC
=
1.8V
±
0.15V
Min
1.5
1.5
1.5
Max
8.2
9.8
8.8
0.75
ns
ns
ns
ns
Units
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
Symbol
V
OLP
Parameter
Quiet Output Dynamic Peak V
OL
Conditions
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
V
CC
(V)
1.8
2.5
3.3
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
2.5
3.3
V
OHV
Quiet Output Dynamic Valley V
OH
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
2.5
3.3
T
A
= +25°C
Typical
0.15
0.25
0.35
−0.15
−0.25
−0.35
1.55
2.05
2.65
V
V
V
Units
Capacitance
Symbol
C
IN
C
OUT
C
PD
Input Capacitance
Output Capacitance
Power Dissipation Capacitance
Parameter
Conditions
V
CC
=
1.8, 2.5V or 3.3V, V
I
=
0V or V
CC
V
I
=
0V or V
CC
, V
CC
=
1.8V, 2.5V or 3.3V
V
I
=
0V or V
CC
, f
=
10 MHz, V
CC
=
1.8V, 2.5V or 3.3V
T
A
= +25°C
Typical
6
7
20
pF
pF
pF
Units
5
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