IDT54/74FCT2373T/AT/CT
FAST CMOS OCTAL TRANSPARENT LATCH
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
FAST CMOS OCTAL
TRANSPARENT LATCH
IDT54/74FCT2373T/AT/CT
FEATURES:
−
−
−
−
−
−
−
−
−
Low input and output leakage
≤1µ
A (max.)
CMOS power levels
True TTL input and output compatibility
•
V
OH
= 3.3V (typ.)
•
V
OL
= 0.3V (typ.)
Meets or exceeds JEDEC standard 18 specifications
Military product compliant to MIL-STD-883, Class B and DESC
listed (dual marked)
Std., A and C speed grades
Resistor output
(-15mA I
OH
, 12mA I
OL
Ind.)
(-12mA I
OH
, 12mA I
OL
Mil.)
Reduced system switching noise
Available in the following packages:
•
Industrial: SOIC, QSOP, TSSOP
•
Military: CERDIP, LCC, CERPACK
DESCRIPTION:
The FCT2373T is an octal transparent latch built using an advanced dual
metal CMOS technology. These octal latches have 3-state outputs and are
intended for bus oriented applications. The flip-flops appear transparent to
the data when Latch Enable (LE) is high. When LE is low, the data that meets
the set-up time is latched. Data appears on the bus when the Output Enable
(OE) is low. When
OE
is high, the bus output is in the high-impedance state.
The FCT2373T has balanced drive outputs with current limiting resis-
tors. This offers low ground bounce, minimal undershoot and controlled
output fall times-reducing the need for external series terminating resistors.
The FCT2373T parts are plug-in replacements for FCT373T parts.
FUNCTIONAL BLOCK DIAGRAM
D
0
D
1
D
2
D
3
D
4
D
5
D
6
D
7
D
O
G
D
O
G
D
O
G
D
O
G
D
O
G
D
O
G
D
O
G
D
O
G
LE
OE
O
0
O
1
O
2
O
3
O
4
O
5
O
6
O
7
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
1
c
2001 Integrated Device Technology, Inc.
MAY 2001
DSC-5497/-
IDT54/74FCT2373T/AT/CT
FAST CMOS OCTAL TRANSPARENT LATCH
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
PIN CONFIGURATION
O
0
OE
O
0
D
0
D
1
O
1
O
2
D
2
D
3
O
3
GND
2
3
4
5
6
7
8
9
10
P20-1
D20-1
SO20-2
SO20-8
SO20-9
E20-1
19
18
17
16
15
14
13
12
11
O
7
D
7
D
6
O
6
O
2
O
5
D
2
D
5
D
4
O
4
D
3
7
8
9
10
11
12
13
15
14
6
L20-2
16
3
2
1
20
19
18
17
D
1
O
1
D
0
O
7
OE
1
20
V
CC
INDEX
V
CC
4
5
D
7
D
6
O
6
O
5
D
5
O
3
O
4
LE
DIP/ SOIC/ QSOP/ TSSOP/ CERPACK
TOP VIEW
ABSOLUTE MAXIMUM RATINGS
(1)
Symbol
V
TERM(2)
V
TERM(3)
T
STG
I
OUT
Rating
Terminal Voltage with Respect to GND
Terminal Voltage with Respect to GND
Storage Temperature
DC Output Current
Max.
–0.5 to +7
–0.5 to V
CC
+0.5
–65 to +150
–60 to +120
Unit
V
V
°C
mA
8T-link
PIN DESCRIPTION
Pin Names
D
N
LE
OE
O
N
Description
Data Inputs
Latch Enable Input (Active HIGH)
Output Enable Input (Active LOW)
3-State Outputs
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.
No
terminal voltage may exceed Vcc by +0.5V unless otherwise noted.
2. Inputs and Vcc terminals only.
3. Outputs and I/O terminals only.
FUNCTION TABLE
D
N
L
H
X
Inputs
LE
H
H
X
GND
LCC
TOP VIEW
LE
(1)
Outputs
O
N
L
H
Z
OE
L
L
H
CAPACITANCE
(T
A
= +25
O
C, f = 1.0MHz)
Symbol
C
IN
C
OUT
Parameter
(1)
Input Capacitance
Output Capacitance
Conditions
V
IN
= 0V
V
OUT
= 0V
Typ.
6
8
Max.
10
12
Unit
pF
pF
8T-link
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Don't Care
Z = High-Impedance
NOTE:
1. This parameter is measured at characterization but not tested.
2
D
4
IDT54/74FCT2373T/AT/CT
FAST CMOS OCTAL TRANSPARENT LATCH
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
DC ELECTRICAL CHARACTERISTICS OVER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Industrial: T
A
= -40°C to +85°C, V
CC
= 5.0V ± 5%; Military: T
A
= -55°C to +125°C, V
CC
= 5.0V ± 10%
Symbol
V
IH
V
IL
I
I H
I
I L
I
OZH
I
OZL
I
I
V
IK
V
H
I
CC
Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
(4)
Input LOW Current
(4)
High Impedance Output Current
(3-State output pins)
(4)
Input HIGH Current
Clamp Diode Voltage
Input Hysteresis
Quiescent Power Supply Current
V
CC
= Max., V
I
= V
CC
(Max.)
V
CC
= Min., I
IN
= –18mA
—
V
CC
= Max., V
IN
=
GND or
V
CC
V
CC
= Max.
Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
= Max.
V
I
= 2.7V
V
I
= 0.5V
V
O
= 2.7V
V
O
= 0.5V
Min.
2.0
—
—
—
—
—
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
–0.7
200
0.01
Max.
—
0.8
±1
±1
±1
±1
±1
–1.2
—
1
µA
V
mV
µA
Unit
V
V
µA
µA
µA
OUTPUT DRIVE CHARACTERISTICS
Symbol
I
ODL
I
ODH
V
OH
V
OL
Parameter
Input LOW Current
Input HIGH Current
Output HIGH Voltage
Output LOW Voltage
Test Conditions
(1)
V
CC
= 0V, V
IN =
V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= 0V, V
IN =
V
IH
or V
IL,
V
OUT
= 1.5V
(3)
V
CC
= Min.
V
IN
= V
IH
or V
IL
V
CC
= Min.
V
IN
= V
IH
or V
IL
I
OH
= –12mA MIL
I
OH
= –15mA IND
I
OL
= 12mA
Min.
16
–16
2.4
—
Typ.
(2)
48
–48
3.3
0.3
—
0.5
Max.
Unit
µA
µA
V
V
NOTES:
1. For conditions shown as max. or min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient and maximum loading.
3. Not more than one output should be shorted at one time. Duration of the short circuit test should not exceed one second.
4. The test limit for thie parameter is ±5µA at T
A
= -55°C.
5. This parameter is guaraneteed but not tested.
3
IDT54/74FCT2373T/AT/CT
FAST CMOS OCTAL TRANSPARENT LATCH
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
POWER SUPPLY CHARACTERISTICS
Symbol
∆I
CC
I
CCD
Parameter
Quiescent Power Supply Current
TTL Inputs HIGH
Dynamic Power Supply Current
(4)
Test Conditions
(1)
V
CC
= Max.
V
IN
= 3.4V
(3)
V
CC
= Max.
Outputs Open
OE
= GND
One Input Toggling
50% Duty Cycle
V
CC
= Max.
Outputs Open
fi = 10MHz
50% Duty Cycle
OE
= GND
LE
=
V
CC
One Bit Toggling
V
CC
= Max.
Outputs Open
fi = 2.5MHz
50% Duty Cycle
OE
= GND
LE
=
V
CC
Eight Bits Toggling
Min.
—
—
Typ.
(2)
0.5
0.06
Max.
2
0.12
Unit
mA
mA/
MHz
V
IN
= V
CC
V
IN
= GND
I
C
Total Power Supply Current
(6)
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4
V
IN
= GND
—
0.6
2.2
mA
—
0.9
3.2
V
IN
= V
CC
V
IN
= GND
V
IN
= 3.4
V
IN
= GND
—
1.2
3.4
(5)
3.2
11.4
(
5)
NOTES:
1. For conditions shown as max. or min., use appropriate value specified under Electrical Characteristics for the applicable device type.
2. Typical values are at V
CC
= 5.0V, +25°C ambient.
3. Per TTL driven input (V
IN
= 3.4V); all other inputs at V
CC
or GND.
4. This parameter is not directly testable, but is derived for use in Total Power Supply Calculations.
5. Values for these conditions are examples of the I
CC
formula. These limits are guaranteed but not tested.
6. I
C
= I
QUIESCENT
+ I
INPUTS
+ I
DYNAMIC
I
C
= I
CC
+
∆
I
CC
D
H
N
T
+ I
CCD
(f
CP
/2 + f
i
N
i
)
I
CC
= Quiescent Current
∆
I
CC
= Power Supply Current for a TTL High Input (V
IN
= 3.4V)
D
H
= Duty Cycle for TTL Inputs High
N
T
= Number of TTL Inputs at D
H
I
CCD
= Dynamic Current Caused by an Input Transition Pair (HLH or LHL)
f
CP
= Clock Frequency for Register Devices (Zero for Non-Register Devices)
f
i
= Input Frequency
N
i =
Number of Inputs at f
i
All currents are in milliamps and all frequencies are in megahertz.
4
IDT54/74FCT2373T/AT/CT
FAST CMOS OCTAL TRANSPARENT LATCH
MILITARY AND INDUSTRIAL TEMPERATURE RANGES
(1)
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - INDUSTRIAL
FCT2373T
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SU
t
H
t
W
Parameter
Propagation Delay
D
N
to O
N
Propagation Delay
LE to O
N
Output Enable Time
Output Disable Time
Set-up Time HIGH
or LOW, D
N
to LE
Hold Time HIGH
or LOW, D
N
to LE
LE Pulse Width HIGH
(3)
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.
(2)
1.5
2
1.5
1.5
2
1.5
6
Max.
8
13
12
7.5
—
—
—
FCT2373AT
Min
.
(2)
1.5
2
1.5
1.5
2
1.5
5
Max.
5.2
8.5
6.5
5.5
—
—
—
FCT2373CT
Min
.
(2)
1.5
2
1.5
1.5
2
1.5
5
Max.
4.2
5.5
5.5
5
—
—
—
(1)
Unit
ns
ns
ns
ns
ns
ns
ns
SWITCHING CHARACTERISTICS OVER OPERATING RANGE - MILITARY
FCT2373T
Symbol
t
PLH
t
PHL
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
t
SU
t
H
t
W
Parameter
Propagation Delay
D
N
to O
N
Propagation Delay
LE to O
N
Output Enable Time
Output Disable Time
Set-up Time HIGH
or LOW, D
N
to LE
Hold Time HIGH
or LOW, D
N
to LE
LE Pulse Width HIGH
(3)
Condition
(1)
C
L
= 50pF
R
L
= 500Ω
Min
.
(2)
1.5
2
1.5
1.5
2
1.5
6
Max.
8.5
15
13.5
10
—
—
—
FCT2373AT
Min
.
(2)
1.5
2
1.5
1.5
2
1.5
6
Max.
5.6
9.8
7.5
6.5
—
—
—
FCT2373CT
Min
.
(2)
1.5
2
1.5
1.5
2
1.5
6
Max.
5.1
8
6.3
5.9
—
—
—
Unit
ns
ns
ns
ns
ns
ns
ns
NOTES:
1. See test circuit and wave forms.
2. Minimum limits are guaranteed but not tested on Propagation Delays.
3. This parameter is guaranteed but not tested.
5
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