IDT74LVC821A
3.3V CMOS 10-BIT BUS-INTERFACE FLIP-FLOP
EXTENDED COMMERCIAL TEMPERATURE RANGE
3.3V CMOS 10-BIT
BUS-INTERFACE FLIP-FLOP
WITH 3-STATE OUTPUTS
AND 5 VOLT TOLERANT I/O
FEATURES:
0.5 MICRON CMOS Technology
ESD > 2000V per MIL-STD-883, Method 3015;
> 200V using machine model (C = 200pF, R = 0)
– 1.27mm pitch SOIC, 0.65mm pitch SSOP,
0.635mm pitch QSOP, 0.65mm pitch TSSOP packages
– Extended commercial range of – 40°C to +85°C
– V
CC
= 3.3V ±0.3V, Normal Range
– V
CC
= 2.3V to 3.6V, Extended Range
– CMOS power levels (0.4µ W typ. static)
– Rail-to-Rail output swing for increased noise margin
– All inputs, outputs and I/O are 5 Volt tolerant
– Supports hot insertion
Drive Features for LVC821A:
– High Output Drivers:
±24mA
– Reduced system switching noise
–
–
IDT74LVC821A
ance loads. They are particularly suitable for implementing wider buffer
registers, I/O ports, bidirectional bus drivers with parity, and working
registers.
The ten flip-flops are edge-triggered D-type flip-flops. On the positive
transition of the clock (CLK) input, the device provides true data at the Q
outputs.
A buffered output-enable (OE) input can be used to place the ten outputs
in either a normal logic state (high or low logic levels) 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 interface or pullup components.
OE
does not affect the internal operations of the latch. Previously stored data can
be retained or new data can be entered while the outputs are in the high-
impedance state.
The LVC821A has been designed with a ±24mA output driver. This
driver is capable of driving a moderate to heavy load while maintaining
speed performance.
To ensure the high-impedance state during power up or power down,
OE
should be tied to V
CC
through a pullup resistor; the minimum value of the
resistor is determined by the current-sinking capability of the driver.
Inputs can be driven from either 3.3V or 5V devices. This feature allows
the use of this device as a translator in a mixed 3.3V/5V system environment.
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
DESCRIPTION:
The LVC821A 10-bit bus-interface flip-flop is built using advanced dual
metal CMOS technology. The LVC821A device features 3-state outputs
designed specifically for driving highly capacitive or relatively low-imped-
FUNCTIONAL BLOCK DIAGRAM
OE
CLK
1
13
C
1
1
D
2
1
D
23
1
Q
TO NINE OTHER CHANNELS
EXTENDED COMMERCIAL TEMPERATURE RANGE
1
c
1999 Integrated Device Technology, Inc.
APRIL 1999
DSC-4621/-
IDT74LVC821A
3.3V CMOS 10-BIT BUS-INTERFACE FLIP-FLOP
EXTENDED COMMERCIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
Symbol
V
TERM(2)
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
O
< 0
Continuous Current through
each V
CC
or GND
(1)
Unit
V
V
°C
mA
mA
mA
8LVC
Max.
– 0.5 to +6.5
– 0.5 to +6.5
– 65 to +150
– 50 to +50
– 50
±100
OE
1
D
2
D
3
D
4
D
5
D
6
D
7
D
8
D
9
D
10
D
1
2
3
4
5
6
7
8
9
10
11
12
SO 24-2
SO 24-7
SO 24-8
SO 24-9
24
23
22
21
20
19
18
17
16
15
14
13
V
CC
1
Q
2
Q
3
Q
4
Q
5
Q
6
Q
7
Q
8
Q
9
Q
10
Q
V
TERM(3)
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
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 = 1.0MH
Z
)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output
Capacitance
I/O Port
Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
V
IN
= 0V
Typ.
4.5
5.5
6.5
Max.
6
8
8
Unit
pF
pF
pF
8LVC Link
GND
CLK
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
C
I/O
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
O
E
CLK
xD
xQ
Description
Output-enable Input (Active LOW)
Clock Input
Data Inputs
Data Outputs
FUNCTION TABLE
(each flip-flop)
(1)
OE
L
L
L
H
Inputs
CLK
↑
↑
H or L
X
xD
H
L
X
X
Outputs
xQ
H
L
Q
o
Z
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don’t Care
Z = High-Impedance
↑
= LOW-to-HIGH Transition
Q
0
= Level of Q before the indicated steady-state input conditions
were established.
2
IDT74LVC821A
3.3V CMOS 10-BIT BUS-INTERFACE FLIP-FLOP
EXTENDED COMMERCIAL 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
V
IL
I
IH
I
IL
I
OZH
I
OZL
I
OFF
V
IK
V
H
I
CCL
I
CCH
I
CCZ
∆I
CC
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Input Leakage Current
High Impedance Output Current
(3-State Output pins)
Input/Output Power Off Leakage
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= 0V, V
IN
or V
O
≤
5.5V
V
CC
= 2.3V, I
IN
= – 18mA
V
CC
= 3.3V
V
CC
= 3.6V
V
IN
= GND or V
CC
3.6
≤
V
IN
≤
5.5V
(2)
Quiescent Power Supply
Current Variation
One input at V
CC
- 0.6V,
other inputs at V
CC
or GND
—
—
—
—
—
—
—
– 0.7
100
—
—
—
±50
– 1.2
—
10
10
500
µA
8LVC Link
Test Conditions
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 2.3V to 2.7V
V
CC
= 2.7V to 3.6V
V
CC
= 3.6V
V
CC
= 3.6V
V
I
= 0 to 5.5V
V
O
= 0 to 5.5V
Min.
1.7
2
—
—
—
—
Typ.
(1)
—
—
—
—
—
—
Max.
—
—
0.7
0.8
±5
±10
Unit
V
V
µA
µA
µA
V
mV
µA
NOTES:
1. Typical values are at V
CC
= 3.3V, +25°C ambient.
2. This applies in the disabled state only.
OUTPUT DRIVE CHARACTERISTICS
Symbol
V
OH
Parameter
Output HIGH Voltage
V
CC
Test Conditions
(1)
= 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
I
OH
= – 24mA
I
OL
= 0.1mA
I
OL
= 6mA
I
OL
= 12mA
V
CC
= 2.7V
V
CC
= 3.0V
I
OL
= 12mA
I
OL
= 24mA
2.2
—
—
—
—
—
Max.
—
—
—
—
—
—
0.2
0.4
0.7
0.4
0.55
8LVC Link
Unit
V
V
CC
= 2.3V
V
CC
= 2.3V
V
CC
= 2.7V
V
CC
= 3.0V
V
CC
= 3.0V
V
OL
Output LOW Voltage
V
CC
= 2.3V to 3.6V
V
CC
= 2.3V
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.
3
IDT74LVC821A
3.3V CMOS 10-BIT BUS-INTERFACE FLIP-FLOP
EXTENDED COMMERCIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, TA = 25°C
V
CC
= 2.5V±0.2V
Symbol
Parameter
C
PD
Power Dissipation Capacitance per flip-flop Outputs enabled
C
PD
Power Dissipation Capacitance per flip-flop Outputs disabled
Test Conditions
C
L
= 0pf, f = 10Mhz
Typical
—
—
V
CC
= 3.3V±0.3V
Typical
65
48
Unit
pF
pF
SWITCHING CHARACTERISTICS
Symbol
f
MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
W
t
SU
t
H
t
SK(0)
Parameter
Propagation Delay
CLK to xQ
Output Enable Time
O
or xQ
E
Output Disable Time
O
or xQ
E
Pulse Duration, CLK HIGH or LOW
Setup Time, Data before CLK
Hold Time, Data after CLK
Output Skew
(2)
Min.
—
—
—
—
—
—
—
—
(1)
V
CC
= 2.7V
Min.
150
—
—
—
3.3
1.9
1.5
—
Max.
—
8.5
8.8
6.8
—
—
—
—
V
CC
= 3.3V±0.3V
Min.
150
2.2
1.3
1.6
3.3
1.9
1.5
—
Max.
—
7.3
7.6
6.2
—
—
—
1
Unit
MHz
ns
ns
ns
ns
ns
ns
ns
V
CC
= 2.5V±0.2V
Max.
—
—
—
—
—
—
—
—
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
IDT74LVC821A
3.3V CMOS 10-BIT BUS-INTERFACE FLIP-FLOP
EXTENDED COMMERCIAL TEMPERATURE RANGE
TEST CONDITIONS
Symbol
V
LOAD
V
IH
V
T
V
LZ
V
HZ
C
L
V
CC
(1)
= 3.3V ±0.3V
6
2.7
1.5
300
300
50
6
2.7
1.5
300
300
50
TEST CIRCUITS AND WAVEFORMS
PROPAGATION DELAY
V
CC
(2)
= 2.5V ±0.2V Unit
2 x Vcc
V
Vcc
V
CC
/ 2
150
150
30
V
V
mV
mV
pF
8LVC Link
V
CC
(1)
= 2.7V
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
LVC Link
TEST CIRCUITS FOR ALL OUTPUTS
V
CC
500
Ω
Pulse
(1, 2)
Generator
V
IN
D.U.T.
500
Ω
C
L
V
OUT
V
LOAD
Open
GND
ENABLE AND DISABLE TIMES
ENABLE
CONTROL
INPUT
t
PZL
OUTPUT
SWITCH
NORMALLY
CLOSED
LOW
t
PZH
OUTPUT
SWITCH
NORMALLY
OPEN
HIGH
V
LOAD/2
V
T
t
PHZ
V
T
0V
t
PLZ
DISABLE
V
IH
V
T
0V
V
LOAD/2
V
OL+
V
LZ
V
OL
V
OH
V
OH-
V
HZ
0V
LVC Link
R
T
LVC Link
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
≤
10MHz; t
F
≤
2.5ns; t
R
≤
2.5ns.
2. Pulse Generator for All Pulses: Rate
≤
10MHz; t
F
≤
2ns; t
R
≤
2ns.
NOTE:
1. Diagram shown for input Control Enable-LOW and input Control
Disable-HIGH.
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other tests
Switch
V
LOAD
SET-UP, HOLD, AND RELEASE TIMES
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS
CONTROL
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
LVC Link
GND
Open
8LVC Link
OUTPUT SKEW - tsk (x)
INPUT
t
PLH1
t
PHL1
SYNCHRONOUS
CONTROL
t
SU
t
H
V
IH
V
T
0V
V
OH
PULSE WIDTH
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
V
T
LVC Link
OUTPUT 1
t
SK
(x)
t
SK
(x)
V
T
V
OL
V
OH
V
T
OUTPUT 2
t
PLH2
t
PHL2
V
T
V
OL
t
SK
(x)
= t
PLH2
-
t
PLH1
or
t
PHL2
-
t
PHL1
LVC
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.
Link
5
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