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74VCX16721MTD

P1-P3P4-P6P7-P9
© 2004 Fairchild Semiconductor Corporation DS500143 www.fairchildsemi.com
March 1998
Revised October 2004
74VCX16721 Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant Inputs and Outputs
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 (1.4V 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
■ 1.4V to 3.6V V
CC
supply operation
■ 3.6V tolerant inputs and outputs
■ t
PD
(CLK to O
n
)
3.5 ns max for 3.0V to 3.6V V
CC
■ Power-off high impedance inputs and outputs
■ Supports live insertion and withdrawal (Note 1)
■ Static Drive (I
OH
/I
OL
)
±24 mA @ 3.0V V
CC
■ Uses patented noise/EMI reduction circuitry
■ Latch-up performance exceeds 300 mA
■ 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)
www.fairchildsemi.com 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
XXH X Z
XHL X O
0
LL L L
LL H H
L or H L L X O
0
3 www.fairchildsemi.com
74VCX16721
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
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-STATED
−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 1.4V 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 ±24 mA
V
CC
= 2.3V to 2.7V ±18 mA
V
CC
= 1.65V to 2.3V ±6 mA
V
CC
= 1.4V to 1.6V ±2 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
2.3 - 2.7 1.6
1.65 - 2.3 0.65 x V
CC
1.4 - 1.6 0.65 x V
CC
V
IL
LOW Level Input Voltage 2.7 - 3.6 0.8
V
2.3 - 2.7 0.7
1.65 - 2.3 0.35 x V
CC
1.4 - 1.6 0.35 x V
CC
V
OH
HIGH Level Output Voltage I
OH
= −100 µA 2.7 - 3.6 V
CC
- 0.2
V
I
OH
= −12 mA 2.7 2.2
I
OH
= −18 mA 3.0 2.4
I
OH
= −24 mA 3.0 2.2
I
OH
= −100 µA 2.3 - 2.7 V
CC
- 0.2
I
OH
= −6 mA 2.3 2.0
I
OH
= −12 mA 2.3 1.8
I
OH
= −18 mA 2.3 1.7
I
OH
= −100 µA 1.65 - 2.3 V
CC
- 0.2
I
OH
= −6 mA 1.65 1.25
I
OH
= −100 µA 1.4 - 1.6 V
CC
- 0.2
I
OH
= −12 mA 1.4 1.05
P1-P3P4-P6P7-P9

74VCX16721MTD

Mfr. #:
Buy 74VCX16721MTD
Manufacturer:
ON Semiconductor / Fairchild
Description:
Flip Flops 20-Bit D Flip-Flop
Lifecycle:
New from this manufacturer.
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