IDT74LVC374A
3.3V CMOS OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
INDUSTRIAL TEMPERATURE RANGE
3.3V CMOS OCTAL
EDGE-TRIGGERED D-TYPE FLIP-
FLOP WITH 3-STATE OUTPUTS
AND 5 VOLT TOLERANT I/O
• 0.5 MICRON CMOS Technology
• 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
• CMOS power levels (0.4µ W typ. static)
µ
• Rail-to-rail output swing for increased noise margin
• All inputs, outputs, and I/O are 5V tolerant
• Supports hot insertion
• Available in SOIC, SSOP, QSOP, and TSSOP packages
IDT74LVC374A
FEATURES:
DRIVE FEATURES:
• High Output Drivers: ±24mA
• Reduced system switching noise
APPLICATIONS:
• 5V and 3.3V mixed voltage systems
• Data communication and telecommunication systems
The LVC374A octal edge triggered D-type flip-flop is built using advanced
dual metal CMOS technology. This device features 3-state outputs designed
specifically for driving highly capacitive or relatively low-impedance loads.
The LVC374A device is particularly suitable for implementing buffer regis-
ters, input-output (I/O) ports, bidirectional bus drivers, and working regis-
ters.
On the positive transition of the clock (CLK) input, the Q outputs are set
to the logic levels set up at the data (D) inputs.
A buffered output-enable (OE) input can be used to place the eight 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 internal operations of the latch. Old data can be retained or
new data can be entered while the outputs are in the high-impedance state.
The LVC374A 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.
DESCRIPTION:
FUNCTIONAL BLOCK DIAGRAM
OE
1
CLK
11
C
1
1
D
3
1
D
2
1
Q
TO SEVEN OTHER CHANNELS
The IDT logo is a registered trademark of Integrated Device Technology, Inc.
INDUSTRIAL TEMPERATURE RANGE
1
© 1999 Integrated Device Technology, Inc.
APRIL 1999
DSC-4618/2
IDT74LVC374A
3.3V CMOS OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
INDUSTRIAL TEMPERATURE RANGE
PIN CONFIGURATION
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
Description
Max
V
TERM
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
–0.5 to +6.5
–65 to +150
–50 to +50
–50
±100
T
STG
I
OUT
I
IK
I
OK
I
CC
I
SS
Unit
V
°C
mA
mA
mA
OE
1
Q
1
D
2
D
2
Q
3
Q
3
D
4
D
4
Q
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
V
CC
8
Q
8
D
7
D
7
Q
6
Q
6
D
5
D
5
Q
NOTE:
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.
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.
4.5
5.5
6.5
Max.
6
8
8
Unit
pF
pF
pF
GND
CLK
SOIC/ SSOP/ QSOP/ TSSOP
TOP VIEW
NOTE:
1. As applicable to the device type.
PIN DESCRIPTION
Pin Names
OE
CLK
xD
xQ
Clock Input
Data Inputs
Data Outputs
Description
Output Enable Input (Active LOW)
FUNCTION TABLE
(EACH FLIP-FLOP)
(1)
Inputs
xD
H
L
X
X
CLK
↑
↑
H or L
X
OE
L
L
L
H
Outputs
xQ
H
L
Q
(2)
Z
NOTES:
1. H = HIGH Voltage Level
X = Don’t Care
L = LOW Voltage Level
Z = High-Impedance
↑
= LOW-to-HIGH Transition
2. Output level before the indicated steady-state input conditions were established.
2
IDT74LVC374A
3.3V CMOS OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
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
V
IL
I
IH
I
IL
I
OZH
I
OZL
I
OFF
V
IK
V
H
I
CCL
I
CCH
I
CCZ
∆I
CC
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
—
—
—
—
—
—
—
–0.7
100
—
—
—
±50
–1.2
—
10
10
500
µA
V
mV
µA
V
CC
= 3.6V
V
O
= 0 to 5.5V
—
—
±10
µA
Parameter
Input HIGH Voltage Level
Input LOW Voltage Level
Input Leakage Current
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
I
= 0 to 5.5V
Test Conditions
Min.
1.7
2
—
—
—
Typ.
(1)
—
—
—
—
—
Max.
—
—
0.7
0.8
±5
µA
V
Unit
V
Quiescent Power Supply Current
Variation
3.6
≤
V
IN
≤
5.5V
(2)
One input at V
CC
- 0.6V, other inputs at V
CC
or GND
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
= 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
2.2
—
—
—
—
—
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.
3
IDT74LVC374A
3.3V CMOS OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
INDUSTRIAL TEMPERATURE RANGE
OPERATING CHARACTERISTICS, V
CC
= 3.3V ± 0.3V, T
A
= 25°C
Symbol
C
PD
C
PD
Parameter
Power Dissipation Capacitance per Flip-Flop Outputs enabled
Power Dissipation Capacitance per Flip-Flop Outputs disabled
Test Conditions
C
L
= 0pF, f = 10Mhz
Typical
54.5
13.5
Unit
pF
SWITCHING CHARACTERISTICS
(1)
V
CC
= 2.7V
Symbol
f
MAX
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
W
t
SU
t
H
t
SK
(o)
Propagation Delay
CLK to xQ
Output Enable Time
OE
to xQ
Output Disable Time
OE
to xQ
Pulse Duration, CLK HIGH or LOW
Set-up Time, data before CLK↑
Hold Time, data after CLK↑
Output Skew
(2)
3.3
2
1.5
—
—
—
3.3
2
1.5
—
—
—
1
ns
ns
ns
ns
—
7.1
1.5
6.5
ns
—
8.5
1.5
7.5
ns
Parameter
Min.
80
—
Max.
—
8.1
V
CC
= 3.3V ± 0.3V
Min.
100
1.5
Max.
—
7
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
IDT74LVC374A
3.3V CMOS OCTAL EDGE-TRIGGERED D-TYPE FLIP-FLOP
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
LVC Link
V
CC
500Ω
Pulse
(1, 2)
Generator
V
IN
D.U.T.
R
T
500Ω
C
L
V
OUT
V
LOAD
Open
GND
CONTROL
INPUT
Propagation Delay
ENABLE
DISABLE
V
IH
V
T
0V
V
LOAD/2
V
OL+
V
LZ
V
OL
V
OH
V
OH-
V
HZ
0V
LVC Link
t
PZL
OUTPUT
SWITCH
NORMALLY
V
LOAD
LOW
t
PZH
OUTPUT
SWITCH
NORMALLY
GND
HIGH
V
LOAD/2
V
T
t
PHZ
V
T
0V
t
PLZ
LVC 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
≤
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.
Enable and Disable Times
SWITCH POSITION
Test
Open Drain
Disable Low
Enable Low
Disable High
Enable High
All Other Tests
Switch
V
LOAD
GND
Open
DATA
INPUT
TIMING
INPUT
ASYNCHRONOUS
CONTROL
SYNCHRONOUS
CONTROL
V
IH
V
T
0V
V
OH
V
T
V
OL
V
OH
V
T
V
OL
t
SU
t
H
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
INPUT
Set-up, Hold, and Release Times
t
PLH1
t
PHL1
OUTPUT 1
t
SK
(x)
t
SK
(x)
LOW-HIGH-LOW
PULSE
t
W
HIGH-LOW-HIGH
PULSE
V
T
OUTPUT 2
t
PLH2
t
PHL2
V
T
Pulse Width
LVC Link
LVC Link
t
SK
(x)
= t
PLH2
-
t
PLH1
or
t
PHL2
-
t
PHL1
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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