IDT74ALVCH16721
3.3V CMOS 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS 20-BIT
FLIP-FLOP WITH 3-STATE
OUTPUTS AND BUS-HOLD
FEATURES:
• 0.5 MICRON CMOS Technology
• Typical t
SK(o)
(Output Skew) < 250ps
• ESD > 2000V per MIL-STD-883, Method 3015; > 200V using
machine model (C = 200pF, R = 0)
• V
CC
= 3.3V ± 0.3V, Normal Range
• V
CC
= 2.7V to 3.6V, Extended Range
• V
CC
= 2.5V ± 0.2V
• CMOS power levels (0.4μ W typ. static)
μ
• Rail-to-Rail output swing for increased noise margin
• Available in TSSOP package
IDT74ALVCH16721
DESCRIPTION:
This 20-bit flip-flop is built using advanced dual metal CMOS technology. The
20 flip-flops of the ALVCH16721 are edge-triggered D-type flip-flops with
qualified clock storage. On the positive transition of the clock (CLK) input, the
device provides true data at the Q outputs if the clock-enable (CLKEN) input
is low. If
CLKEN
is high, no data is stored.
A buffered output-enable (OE) input places the 20 outputs in either a normal
logic state (high or low) or a high-impedance state. In the high-impedance state,
the outputs neither load nor drive the bus lines significantly. The high-
impedance state and increased drive provide the capability to drive bus lines
without need for interface or pullup components.
OE
does not affect the internal
operation of the flip-flops. Old data can be retained or new data can be entered
while the outputs are in the high-impedance state.
The ALVCH16721 has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining speed
performance.
The ALVCH16721 has “bus-hold” which retains the inputs’ last state
whenever the input goes to a high impedance. This prevents floating inputs
and eliminates the need for pull-up/down resistor.
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Low switching noise
APPLICATIONS:
• 3.3V high speed systems
• 3.3V and lower voltage computing systems
FUNCTIONAL BLOCK DIAGRAM
OE
1
CLK
56
CLKEN
29
CE
C1
2
Q
1
D
1
55
1D
TO 19 OTHER CHANNELS
IDT and the IDT logo are registered trademarks of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 2009 Integrated Device Technology, Inc.
JULY 2009
DSC-4747/5
IDT74ALVCH16721
3.3V CMOS 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
OE
Q
1
Q
2
GND
Q
3
Q
4
V
CC
Q
5
Q
6
Q
7
GND
Q
8
Q
9
Q
10
Q
11
Q
12
Q
13
GND
Q
14
Q
15
Q
16
V
CC
Q
17
Q
18
GND
Q
19
Q
20
NC
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
56
55
54
53
52
51
50
49
48
47
46
45
44
43
42
41
40
39
38
37
36
35
34
33
32
31
30
29
CLK
D
1
D
2
GND
D
3
D
4
V
CC
D
5
D
6
D
7
GND
D
8
D
9
D
10
D
11
D
12
D
13
GND
D
14
D
15
D
16
V
CC
D
17
D
18
GN
D
D
19
D
20
CLKEN
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM
(2)
V
TERM
(3)
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Description
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Continuous Clamp Current,
V
I
< 0 or V
I
> V
CC
Continuous Clamp Current, V
O
< 0
Continuous Current through each
V
CC
or GND
Max
–0.5 to +4.6
–0.5 to V
CC
+0.5
–65 to +150
–50 to +50
±50
–50
±100
Unit
V
V
°C
mA
mA
mA
mA
NOTES:
1. Stresses greater than those listed under ABSOLUTE MAXIMUM RATINGS may cause
permanent damage to the device. This is a stress rating only and functional operation
of the device at these or any other conditions above those indicated in the operational
sections of this specification is not implied. Exposure to absolute maximum rating
conditions for extended periods may affect reliability.
2. V
CC
terminals.
3. All terminals except V
CC
.
CAPACITANCE
(T
A
= +25°C, F = 1.0MHz)
Symbol
C
IN
C
OUT
C
I/O
Parameter
(1)
Input Capacitance
Output Capacitance
I/O Port Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
5
7
7
Max.
7
9
9
Unit
pF
pF
pF
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
OE
Dx
Qx
CLK
CLKEN
NC
Description
3–State Output Enable Input (Active LOW)
Data Inputs
(1)
3-State Outputs
Clock Input
Clock Enable Input (Active LOW)
No Internal Connection
TSSOP
TOP VIEW
NOTE:
1. These pins have "Bus-Hold". All other pins are standard inputs, outputs, or I/Os.
FUNCTION TABLE
(EACH FLIP-FLOP)
(1)
Inputs
OE
L
L
L
L
H
CLKEN
H
L
L
L
X
CLK
X
↑
↑
L or H
X
Dx
X
H
L
X
X
Output
Qx
Q
0(2)
H
L
Q
0(2)
Z
NOTES:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High Impedance
↑
= LOW-to-HIGH transition
2. Output level before the indicated steady-state input conditions were established.
2
IDT74ALVCH16721
3.3V CMOS 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Operating Condition: T
A
= –40°C to +85°C
Symbol
V
IH
Parameter
Input HIGH Voltage Level
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
IL
I
IH
I
IL
I
OZH
I
OZL
V
IK
V
H
I
CCL
I
CCH
I
CCZ
ΔI
CC
Input LOW Voltage Level
Input HIGH Current
Input LOW Current
High Impedance Output Current
(3-State Output pins)
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 2.3V, I
IN
= –18mA
V
CC
= 3.3V
V
CC
= 3.6V
V
IN
= GND or V
CC
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
I
= V
CC
V
I
= GND
V
O
= V
CC
V
O
= GND
Test Conditions
Min.
1.7
2
—
—
—
—
—
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
—
—
–0.7
100
0.1
Max.
—
—
0.7
0.8
±5
±5
±10
±10
–1.2
—
40
V
mV
µA
µA
µA
µA
V
Unit
V
Quiescent Power Supply Current
Variation
—
—
750
µA
NOTE:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
BUS-HOLD CHARACTERISTICS
Symbol
I
BHH
I
BHL
I
BHH
I
BHL
I
BHHO
I
BHLO
NOTES:
1. Pins with Bus-Hold are identified in the pin description.
2. Typical values are at V
CC
= 3.3V, +25°C ambient.
Parameter
(1)
Bus-Hold Input Sustain Current
Bus-Hold Input Sustain Current
Bus-Hold Input Overdrive Current
V
CC
= 3V
V
CC
= 2.3V
V
CC
= 3.6V
Test Conditions
V
I
= 2V
V
I
= 0.8V
V
I
= 1.7V
V
I
= 0.7V
V
I
= 0 to 3.6V
Min.
– 75
75
– 45
45
—
Typ.
(2)
—
—
—
—
—
Max.
—
—
—
—
±500
Unit
µA
µA
µA
3
IDT74ALVCH16721
3.3V CMOS 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
V
CC
= 3V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3V
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
I
OL
= 12mA
I
OL
= 24mA
Test Conditions
(1)
V
CC
= 2.3V to 3.6V
I
OH
= – 0.1mA
I
OH
= – 6mA
I
OH
= – 12mA
Min.
V
CC
– 0.2
2
1.7
2.2
2.4
2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
V
Unit
V
NOTE:
1. V
IH
and V
IL
must be within the min. or max. range shown in the DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE table for the appropriate V
CC
range.
T
A
= – 40°C to + 85°C.
OPERATING CHARACTERISTICS, T
A
= 25°C
V
CC
= 2.5V ± 0.2V
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance Outputs enabled
Power Dissipation Capacitance Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
55
46
V
CC
= 3.3V ± 0.3V
Typical
59
49
Unit
pF
SWITCHING CHARACTERISTICS
(1)
V
CC
= 2.5V ± 0.2V
Symbol
f
MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SU
t
SU
t
H
t
H
t
W
t
SK(O)
Propagation Delay
CLK to Qx
Output Enable Time
OE
to Qx
Output Disable Time
OE
to Qx
Set-up Time, data before CLK↑
Set-up Time,
CLKEN
before CLK↑
Hold Time, data after CLK↑
Hold Time,
CLKEN
after CLK↑
Pulse Width, CLK HIGH or LOW
Output Skew
(2)
4
3.4
0
0
3.3
—
—
—
—
—
—
—
3.6
3.1
0
0
3.3
—
—
—
—
—
—
—
3.1
2.7
0
0
3.3
—
—
—
—
—
—
500
ns
ns
ns
ns
ns
ps
1
5.5
1
4.7
1
4.4
ns
1
6.1
1
5.8
1
4.8
ns
Parameter
Min.
150
1
Max.
—
5.6
V
CC
= 2.7V
Min.
150
1
Max.
—
5.1
V
CC
= 3.3V ± 0.3V
Min.
150
1
Max.
—
4.3
Unit
MHz
ns
NOTES:
1. See TEST CIRCUITS AND WAVEFORMS. T
A
= – 40°C to + 85°C.
2. Skew between any two outputs of the same package and switching in the same direction.
4
IDT74ALVCH16721
3.3V CMOS 20-BIT FLIP-FLOP WITH 3-STATE OUTPUTS
INDUSTRIAL TEMPERATURE RANGE
TEST CIRCUITS AND WAVEFORMS
TEST CONDITIONS
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC(1)
= 3.3V±0.3V V
CC(1)
= 2.7V
6
2.7
1.5
300
300
50
6
2.7
1.5
300
300
50
V
CC(2)
= 2.5V±0.2V
2 x Vcc
Vcc
Vcc / 2
150
150
30
Unit
V
V
V
mV
mV
pF
SAME PHASE
INPUT TRANSITION
t
PLH
OUTPUT
t
PLH
OPPOSITE PHASE
INPUT TRANSITION
t
PHL
t
PHL
V
IH
V
T
0V
V
OH
V
T
V
OL
V
IH
V
T
0V
ALVC Link
Propagation Delay
ENABLE
CONTROL
INPUT
t
PZL
V
LOAD/2
OUTPUT
SWITCH
V
T
NORMALLY
CLOSED
LOW
t
PHZ
t
PZH
OUTPUT
SWITCH
NORMALLY
V
OPEN
T
HIGH
0V
DIS-
ABLE
t
PLZ
V
IH
V
T
0V
V
LOAD/2
V
LZ
V
OL
V
OH
V
HZ
0V
ALVC Link
V
CC
500Ω
Pulse
Generator
(1, 2)
V
LOAD
Open
GND
V
IN
D.U.T.
R
T
V
OUT
500Ω
C
L
ALVC Link
Test Circuit for All Outputs
DEFINITIONS:
C
L
= Load capacitance: includes jig and probe capacitance.
R
T
= Termination resistance: should be equal to Z
OUT
of the Pulse Generator.
NOTES:
1. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
2. Pulse Generator for All Pulses: Rate
≤
1.0MHz; t
F
≤
2ns; t
R
≤
2ns.
Enable and Disable Times
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control Disable-HIGH.
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS
CONTROL
SYNCHRONOUS
CONTROL
t
SU
t
H
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other Tests
Switch
V
LOAD
GND
Open
t
REM
t
SU
t
H
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
V
IH
V
T
0V
ALVC Link
INPUT
t
PLH1
t
PHL1
V
IH
V
T
0V
V
OH
V
T
V
OL
V
OH
V
T
V
OL
Set-up, Hold, and Release Times
OUTPUT 1
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
V
T
t
SK
(x)
t
SK
(x)
OUTPUT 2
t
PLH2
t
PHL2
V
T
ALVC Link
t
SK
(x)
= t
PLH2
-
t
PLH1
or
t
PHL2
-
t
PHL1
ALVC Link
Pulse Width
Output Skew - t
SK
(
X
)
NOTES:
1. For t
SK
(o) OUTPUT1 and OUTPUT2 are any two outputs.
2. For t
SK
(b) OUTPUT1 and OUTPUT2 are in the same bank.
5
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