74VCX16821 PDF даташит
Спецификация 74VCX16821 изготовлена «Fairchild Semiconductor» и имеет функцию, называемую «Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant Inputs and Outputs». |
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Детали детали
Номер произв | 74VCX16821 |
Описание | Low Voltage 20-Bit D-Type Flip-Flops with 3.6V Tolerant Inputs and Outputs |
Производители | Fairchild Semiconductor |
логотип |
9 Pages
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March 1998
Revised October 2004
74VCX16821
Low Voltage 20-Bit D-Type Flip-Flops
with 3.6V Tolerant Inputs and Outputs
General Description
The VCX16821 contains twenty non-inverting D-type flip-
flops with 3-STATE outputs and is intended for bus oriented
applications.
The 74VCX16821 is designed for low voltage (1.4V to
3.6V) VCC applications with I/O compatibility up to 3.6V.
The 74VCX16821 is fabricated with an advanced CMOS
technology to achieve high speed operation while maintain-
ing low CMOS power dissipation.
Features
s 1.4V to 3.6V VCC supply operation
s 3.6V tolerant inputs and outputs
s tPD
3.5 ns max for 3.0V to 3.6V VCC
s Power-off high impedance inputs and outputs
s Supports live insertion and withdrawal (Note 1)
s Static Drive (IOH/IOL)
±24 mA @ 3.0V VCC
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 VCC 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 Package Number
Package Descriptions
74VCX16821MTD
MTD56
56-Lead Thin Shrink Small Outline Package (TSSOP), JEDEC MO-153, 6.1mm Wide
Device also available in Tape and Reel. Specify by appending suffix letter “X” to the ordering code.
Logic Symbol
Pin Descriptions
Pin Names
Description
OEn
CLKn
D0–D19
O0–O19
Output Enable Input (Active LOW)
Clock Input
Inputs
Outputs
© 2004 Fairchild Semiconductor Corporation DS500130
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Connection Diagram
Logic Diagrams
Truth Tables
Inputs
Outputs
CLK1
OE1
D0–D9
O0–O9
XHX Z
L L L
L H H
L or H
L
X O0
Inputs
Outputs
CLK2
OE2
D10–D19 O10–O19
XHX Z
L L L
L H H
L or H
L
X O0
H = HIGH Voltage Level
L = LOW Voltage Level
X = Immaterial (HIGH or LOW, inputs may not float)
Z = High Impedance
O0 = Previous O0 before LOW-to-HIGH transition of Clock
= LOW-to-HIGH transition
Functional Description
The VCX16821 contains twenty D-type flip-flops with
3-STATE standard outputs. The device is byte controlled
with each byte functioning identically, but independent of
each other. Control pins can be shorted together to obtain
full 20-bit operation. The following description applies to
each byte. 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-to-HIGH Clock (CLK) transition.
The 3-STATE standard outputs are controlled by the Out-
put Enable (OEn) input. When OEn is HIGH, the standard
outputs are in the high impedance mode but this does not
interfere with entering new data into the flip-flops.
Please note that this diagram is provided only for the understanding of logic operations and should not be used to estimate propagation delays.
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Absolute Maximum Ratings(Note 2)
Supply Voltage (VCC)
DC Input Voltage (VI)
Output Voltage (VO)
Outputs 3-STATE
Outputs Active (Note 3)
DC Input Diode Current (IIK) VI < 0V
DC Output Diode Current (IOK)
VO < 0V
VO > VCC
DC Output Source/Sink Current
(IOH/IOL)
DC VCC or GND Current per
Supply Pin (ICC or GND)
Storage Temperature Range (TSTG)
−0.5V to +4.6V
−0.5V to +4.6V
−0.5V to +4.6V
−0.5V to VCC + 0.5V
−50 mA
−50 mA
+50 mA
±50 mA
±100 mA
−65°C to +150°C
Recommended Operating
Conditions (Note 4)
Power Supply
Operating
1.4V to 3.6V
Input Voltage
−0.3V to +3.6V
Output Voltage (VO)
Output in Active States
Output in 3-STATE
0V to VCC
0.0V to 3.6V
Output Current in IOH/IOL
VCC = 3.0V to 3.6V
VCC = 2.3V to 2.7V
VCC = 1.65V to 2.3V
VCC = 1.4V to 1.6V
Free Air Operating Temperature (TA)
Minimum Input Edge Rate (∆t/∆V)
±24 mA
±18 mA
±6 mA
±2 mA
−40°C to +85°C
VIN = 0.8V to 2.0V, VCC = 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: IO Absolute Maximum Rating must be observed.
Note 4: Floating or unused inputs must be held HIGH or LOW.
DC Electrical Characteristics
Symbol
Parameter
VIH HIGH Level Input Voltage
VIL LOW Level Input Voltage
VOH HIGH Level Output Voltage
Conditions
IOH = −100 µA
IOH = −12 mA
IOH = −18 mA
IOH = −24 mA
IOH = −100 µA
IOH = −6 mA
IOH = −12 mA
IOH = −18 mA
IOH = −100 µA
IOH = −6 mA
IOH = −100 µA
IOH = −12 mA
VCC
(V)
2.7 - 3.6
2.3 - 2.7
1.65 - 2.3
1.4 - 1.6
2.7 - 3.6
2.3 - 2.7
1.65 - 2.3
1.4 - 1.6
2.7 - 3.6
2.7
3.0
3.0
2.3 - 2.7
2.3
2.3
2.3
1.65 - 2.3
1.65
1.4 - 1.6
1.4
Min Max
2.0
1.6
0.65 x VCC
0.65 x VCC
0.8
0.7
VCC - 0.2
2.2
0.35 x VCC
0.35 x VCC
2.4
2.2
VCC - 0.2
2.0
1.8
1.7
VCC - 0.2
1.25
VCC - 0.2
1.05
Units
V
V
V
3 www.fairchildsemi.com
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