
MILITARY AND COMMERCIAL TEMPERATURE RANGES
IDT54/74FCT821/A/B
HIGH PERFORMANCE CMOS BUS INTERFACE REGISTER
3
NOTE:
1. H = HIGH Voltage Level
L = LOW Voltage Level
X = Dont Care
Z = High Impedance
NC = No Change
↑
 = LOW-to-HIGH transition
FUNCTION TABLE
(1)
Inputs
Dx
L
H
X
X
X
X
L
H
L
H
Outputs
Yx
OE
H
H
H
L
H
L
H
H
L
L
CP
↑
↑
X
X
X
X
↑
↑
↑
↑
Function
High Z
Z
Z
Z
L
Z
Clear
Hold
NC
Z
Z
L
H
Load
NOTES:
1. For conditions shown as Mn. or Max., 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. Not more than one output should be tested at one time. Duration of the test should not exceed one second.
4. This parameter is guaranteed, but not tested.
Symbol
V
IH
V
IL
I
IH
                Parameter
Input HIGH Level
Input LOW Level
Input HIGH Current
                               Test Conditions
(1)
Guaranteed Logic HIGH Level
Guaranteed Logic LOW Level
V
CC
 = Max.
Min.
2
—
—
—
—
—
—
—
—
—
—
–75
V
HC
V
HC
2.4
2.4
—
—
—
—
Typ.
(2)
—
—
—
—
—
—
—
—
—
—
–0.7
–120
V
CC
V
CC
4.3
4.3
GND
GND
0.3
0.3
Max.
—
0.8
5
5
(4)
–5
(4)
–5
10
10
(4)
–10
(4)
–10
–1.2
—
—
—
—
—
V
LC
V
LC
(4)
0.5
0.5
Unit
V
V
μA
V
I
 = V
CC
V
I
 = 2.7V
V
I
 = 0.5V
V
I
 = GND
V
O
 = V
CC
V
O
 = 2.7V
V
O
 = 0.5V
V
O
 = GND
I
IL
Input LOW Current
V
CC
 = Max.
μA
I
OZH
Off State (High Impedance)
Output Current
V
CC
 = Max.
μA
I
OZL
V
IK
I
OS
V
OH
Clamp Diode Voltage
Short Circuit Current
Output HIGH Voltage
V
CC
 = Min., I
IN 
= –18mA
V
CC
 = Max., V
O 
= GND
(3)
V
CC
 = 3V, V
IN
 = V
LC 
or V
HC
, I
OH
 = –32μA
V
CC
 = Mn
V
IN
 = V
IH 
or V
IL
V
mA
I
OH
 = –300μA
I
OH
 = –15mA MIL
I
OH
 = –24mA COM
V
V
OL
Output LOW Voltage
V
CC
 = 3V, V
IN
 = V
LC 
or V
HC
, I
OL
 = 300μA
V
CC
 = Mn
V
IN
 = V
IH 
or V
IL
I
OL
 = 300μA
I
OL
 = 32mA MIL
I
OL
 = 48mA COM
V
DC ELECTRICAL CHARACTERISTICS OV ER OPERATING RANGE
Following Conditions Apply Unless Otherwise Specified:
Commercial: T
A
 = 0°C to +70°C, V
CC
 = 5.0V ±5%; Mlitary: T
A
 = –55°C to +125°C, V
CC
 = 5.0V ±10%