March 1998
Revised April 1999
7
4
VC
X16
721 Lo
w
V
o
lt
age 2
0
-Bi
t
D-T
ype
Fli
p
-Fl
ops
wit
h
3.
6V T
o
l
e
ran
t
Input
s a
nd Out
puts
© 1999 Fairchild Semiconductor Corporation
DS500143.prf
www.fairchildsemi.com
74VCX16721
Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant
Inputs and Outputs
General Description
The VCX16721 contains twenty non-inverting D-type flip-
flops with 3-STATE outputs and is intended for bus oriented
applications.
The 74VCX16721 is designed for low voltage (1.65V to
3.6V) V
CC
applications with I/O compatibility up to 3.6V.
The 74VCX16721 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s
1.8V3.6V V
CC
supply operation
s
3.6V tolerant inputs and outputs
s
t
PD
(CLK to O
n
)
3.5 ns max for 3.0V to 3.6V V
CC
4.4 ns max for 2.3V to 2.7V V
CC
8.8 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
)
±
24 mA @ 3.0V V
CC
±
18 mA @ 2.3V V
CC
±
6
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:
Device also available in Tape and Reel. Specify by appending suffix letter "X" to the ordering code.
Logic Symbol
Pin Descriptions
Order Number
Package Number
Package Description
74VCX16721MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Pin Names
Description
OE
Output Enable Input (Active LOW)
CLK
Clock Input
D
0
D
19
Inputs
O
0
O
19
Outputs
CE
Clock Enable Input (Active LOW)
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2
74VCX16721
Connection Diagram
Truth Table
H
=
HIGH Voltage Level
L
=
LOW Voltage Level
X
=
Immaterial (HIGH or LOW, inputs may not float)
Z
=
High Impedance
O
0
=
Previous O
0
before LOW-to-HIGH transition of Clock
=
LOW-to-HIGH transition
Functional Description
The VCX16721 contains twenty D-type flip-flops with 3-
STATE standard outputs. The twenty flip-flops will store the
state of their individual D-type inputs that meet the setup
and hold time requirements on the LOW-HIGH Clock (CLK)
transition, when the Clock-Enable (CE) is LOW. The 3-
STATE standard outputs are controlled by the Output-
Enable (OE). When OE is HIGH, the standard outputs are
in high impedance mode but this does not interfere with
entering new data into the flip-flops.
Logic Diagram
CLK
CE
OE
D
0
D
19
O
0
O
19
X
X
H
X
Z
X
H
L
X
O
0
L
L
L
L
L
L
H
H
L or H
L
L
X
O
0
3
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7
4
VC
X16
721
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 "OFF" State
0.0V to 3.6V
Output Current in I
OH
/I
OL
V
CC
=
3.0V to 3.6V
±
24 mA
V
CC
=
2.3V to 2.7V
±
18 mA
V
CC
=
1.65V to 2.3V
±
6 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
(V)
Min
Max
Units
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
µ
A 2.7
-
3.6
V
CC
-
0.2
V
I
OH
=
-
12 mA
2.7
2.2
V
I
OH
=
-
18 mA
3.0
2.4
V
I
OH
=
-
24 mA
3.0
2.2
V
V
OL
LOW Level Output Voltage
I
OL
=
100
µ
A 2.7
-
3.6
0.2
V
I
OL
=
12 mA
2.7
0.4
V
I
OL
=
18 mA
3.0
0.4
V
I
OL
=
24 mA
3.0
0.55
V
I
I
Input Leakage Current
0
V
I
3.6V
2.7
-
3.6
±
5.0
µ
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
2.7
-
3.6
±
10
µ
A
V
I
=
V
IH
or V
IL
I
OFF
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
µ
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.7
-
3.6
20
µ
A
V
CC
(V
I
, V
O
)
3.6V (Note 5)
2.7
-
3.6
±
20
µ
A
I
CC
Increase in I
CC
per Input
V
IH
=
V
CC
-
0.6V
2.7
-
3.6
750
µ
A
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4
74VCX16721
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
(V)
Min
Max
Units
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
µ
A 2.3
-
2.7
V
CC
-
0.2
V
I
OH
=
-
6 mA
2.3
2.0
V
I
OH
=
-
12 mA
2.3
1.8
V
I
OH
=
-
18 mA
2.3
1.7
V
V
OL
LOW Level Output Voltage
I
OL
=
100
µ
A 2.3
-
2.7
0.2
V
I
OL
=
12 mA
2.3
0.4
V
I
OL
=
18 mA
2.3
0.6
V
I
I
Input Leakage Current
0
V
I
3.6V
2.3
-
2.7
±
5.0
µ
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
2.3
-
2.7
±
10
µ
A
V
I
=
V
IH
or V
IL
I
OFF
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
µ
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
2.3
-
2.7
20
µ
A
V
CC
(V
I
, V
O
)
3.6V (Note 6)
2.3
-
2.7
±
20
µ
A
Symbol
Parameter
Conditions
V
CC
(V)
Min
Max
Units
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
µ
A
1.65 - 2.3
V
CC
-
0.2
V
I
OH
=
-
6 mA
1.65
1.25
V
V
OL
LOW Level Output Voltage
I
OL
=
100
µ
A
1.65 - 2.3
0.2
V
I
OL
=
6 mA
1.65
0.3
V
I
I
Input Leakage Current
0
V
I
3.6V
1.65 - 2.3
±
5.0
µ
A
I
OZ
3-STATE Output Leakage
0
V
O
3.6V
1.65 - 2.3
±
10
µ
A
V
I
=
V
IH
or V
IL
I
OFF
Power-OFF Leakage Current
0
(V
I
, V
O
)
3.6V
0
10
µ
A
I
CC
Quiescent Supply Current
V
I
=
V
CC
or GND
1.65 - 2.3
20
µ
A
V
CC
(V
I
, V
O
)
3.6V (Note 7)
1.65 - 2.3
±
20
µ
A
5
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7
4
VC
X16
721
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
f
MAX
Maximum Clock Frequency
250
200
100
MHz
t
PHL
, t
PLH
Prop Delay CLK to O
n
0.8
3.5
1.0
4.4
1.5
8.8
ns
t
PZL
, t
PZH
Output Enable Time
0.8
3.8
1.0
4.9
1.5
9.8
ns
t
PLZ
, t
PHZ
Output Disable Time
0.8
3.7
1.0
4.2
1.5
7.6
ns
t
S
Setup Time
1.5
1.5
2.5
ns
t
H
Hold Time
1.0
1.0
1.0
ns
t
W
Pulse Width
1.5
1.5
4.0
ns
t
OSHL
Output to Output Skew
0.5
0.5
0.75
ns
t
OSLH
(Note 9)
Symbol
Parameter
Conditions
V
CC
(V)
T
A
=
+
25
°
C
Units
Typical
V
OLP
Quiet Output Dynamic Peak V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
0.25
V
2.5
0.6
3.3
0.8
V
OLV
Quiet Output Dynamic Valley V
OL
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
-
0.25
V
2.5
-
0.6
3.3
-
0.8
V
OHV
Quiet Output Dynamic Valley V
OH
C
L
=
30 pF, V
IH
=
V
CC
, V
IL
=
0V
1.8
1.5
V
2.5
1.9
3.3
2.2
Symbol
Parameter
Conditions
T
A
=
+
25
°
C
Units
Typical
C
IN
Input Capacitance
V
CC
=
1.8V, 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,
20
pF
V
CC
=
1.8V, 2.5V or 3.3V
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