Absolute maximum ratings are values beyond which the device
may be damaged or have its useful life impaired. Functional operation
under these conditions is not implied.
Note 2:
Either voltage limit or current limit is sufficient to protect inputs
DC Electrical Characteristics
Symbol
V
IH
V
IL
V
CD
V
OH
V
OL
I
IH
Parameter
Input HIGH Voltage
Input LOW Voltage
Input Clamp Diode Voltage
Output HIGH Voltage
Output LOW Voltage
Input HIGH Current
2.5
2.0
0.55
1
1
I
BVI
I
BVIT
I
IL
Input HIGH Current Breakdown Test
Input HIGH Current Breakdown Test (I/O)
Input LOW Current
7
100
−1
−1
V
ID
I
IH
+
I
OZH
I
IL
+
I
OZL
I
OS
I
CEX
I
ZZ
I
CCH
I
CCL
I
CCZ
I
CCT
Input Leakage Test
4.75
Min
2.0
0.8
−1.2
Typ
Max
Units
V
V
V
V
V
V
µA
µA
µA
µA
V
Min
Min
Min
Min
Max
Max
Max
Max
0.0
V
CC
Conditions
Recognized HIGH Signal
Recognized LOW Signal
I
IN
= −18
mA (OE, T/R)
I
OH
= −3
mA (A
n
, B
n
)
I
OH
= −32
mA (A
n
, B
n
)
I
OL
=
64 mA (A
n
, B
n
)
V
IN
=
2.7V (OE, T/R)
V
IN
=
V
CC
(OE, T/R)
V
IN
=
7.0V (OE, T/R)
V
IN
=
5.5V (A
n
, B
n
)
V
IN
=
0.5V (OE, T/R)
V
IN
=
0.0V (OE, T/R)
I
ID
=
1.9
µA
(OE, T/R)
All Other Pins Grounded
Output Leakage Current
Output Leakage Current
Output Short-Circuit Current
Output HIGH Leakage Current
Bus Drainage Test
Power Supply Current
Power Supply Current
Power Supply Current
−100
10
−10
−275
50
100
50
30
50
µA
µA
mA
µA
µA
µA
mA
µA
mA
mA
µA
mA/
MHz
Max
0
−
5.5V V
OUT
=
2.7V (A
n
, B
n
); OE
=
2.0V
0
−
5.5V V
OUT
=
0.5V (A
n
, B
n
); OE
=
2.0V
Max
Max
0.0
Max
Max
Max
V
OUT
=
0.0V (A
n
, B
n
)
V
OUT
=
V
CC
(A
n
, B
n
)
V
OUT
=
5.5V (A
n
, B
n
);
All Others GND
All Outputs HIGH
All Outputs LOW
OE
=
V
CC
, T/R
=
GND or V
CC
;
All Other GND or V
CC
Additional
I
CC
/Input
Outputs Enabled
Outputs 3-STATE
Outputs 3-STATE
I
CCD
Dynamic I
CC
No Load
2.5
2.5
50
0.1
V
I
=
V
CC
−
2.1V
OE, T/R V
I
=
V
CC
−
2.1V
Data Input V
I
=
V
CC
−
2.1V
All Others at V
CC
or GND.
Max
Outputs Open
OE
=
GND, T/R
=
GND or V
CC
One Bit Toggling, 50% Duty Cycle
3
www.fairchildsemi.com
74ABT245
DC Electrical Characteristics
(SOIC package)
Symbol
V
OLP
V
OLV
V
OHV
V
IHD
V
ILD
Parameter
Quiet Output Maximum Dynamic V
OL
Quiet Output Minimum Dynamic V
OL
Minimum HIGH Level Dynamic Output Voltage
Minimum HIGH Level Dynamic Input Voltage
Maximum LOW Level Dynamic Input Voltage
−1.3
2.7
2.0
Min
Typ
0.7
−1.0
3.1
1.7
0.9
0.6
Max
1.0
Units
V
V
V
V
V
V
CC
5.0
5.0
5.0
5.0
5.0
Conditions
C
L
=
50 pF, R
L
=
500Ω
T
A
=
25°C (Note 3)
T
A
=
25°C (Note 3)
T
A
=
25°C (Note 5)
T
A
=
25°C (Note 4)
T
A
=
25°C (Note 4)
Note 3:
Max number of outputs defined as (n). n-1 data inputs are driven 0V to 3V. One output at LOW. Guaranteed, but not tested.
Note 4:
Max number of data inputs (n) switching. n-1 inputs switching 0V to 3V. Input-under-test switching: 3V to threshold (V
ILD
), 0V to threshold (V
IHD
).
Guaranteed, but not tested.
Note 5:
Max number of outputs defined as (n). n
−
1 data inputs are driven 0V to 3V. One output HIGH. Guaranteed, but not tested.
AC Electrical Characteristics
(SOIC and SSOP package)
T
A
= +25°C
Symbol
Parameter
Min
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Propagation Delay
Data to Outputs
Output Enable
Time
Output Disable
Time
1.0
1.0
1.5
1.5
1.0
1.0
V
CC
= +5V
C
L
=
50 pF
Typ
2.1
2.4
3.2
3.7
3.6
3.3
Max
3.6
3.6
6.0
6.0
6.1
5.6
T
A
= −55°C
to
+125°C
V
CC
=
4.5V–5.5V
C
L
=
50 pF
Min
1.0
1.0
1.0
2.0
1.7
1.7
Max
4.8
4.8
6.7
7.5
7.4
6.5
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
C
L
=
50 pF
Min
1.0
1.0
1.5
1.5
1.0
1.0
Max
3.6
3.6
6.0
6.0
6.1
5.6
ns
ns
ns
Units
Extended AC Electrical Characteristics
(SOIC package)
−40°C
to
+85°C
V
CC
=
4.5V–5.5V
Symbol
Parameter
C
L
=
50 pF
8 Outputs Switching
(Note 6)
Min
f
TOGGLE
t
PLH
t
PHL
t
PZH
t
PZL
t
PHZ
t
PLZ
Output Disable Time
Max Toggle Frequency
Propagation Delay
Data to Outputs
Output Enable Time
1.5
1.5
1.5
1.5
1.0
1.0
Typ
100
5.0
5.0
6.5
6.5
6.5
5.6
1.5
1.5
2.5
2.5
(Note 9)
6.0
6.0
7.5
7.5
2.5
2.5
2.5
2.5
(Note 9)
8.5
8.5
9.5
11.0
Max
Min
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
C
L
=
250 pF
1 Output Switching
(Note 7)
Max
Min
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
C
L
=
250 pF
8 Outputs Switching
(Note 8)
Max
MHz
ns
ns
ns
Units
Note 6:
This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.).
Note 7:
This specification is guaranteed but not tested. The limits represent propagation delay with 250 pF load capacitors in place of the 50 pF load capac-
itors in the standard AC load. This specification pertains to single output switching only.
Note 8:
This specification is guaranteed but not tested. The limits represent propagation delays for all paths described switching in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.) with 250 pF load capacitors in place of the 50 pF load capacitors in the standard AC load.
Note 9:
The 3-STATE delays are dominated by the RC network (500Ω, 250 pF) on the output and have been excluded from the datasheet.
www.fairchildsemi.com
4
74ABT245
Skew
(SOIC package)
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
Symbol
Parameter
C
L
=
50 pF
8 Outputs Switching
(Note 12)
Max
t
OSHL
(Note 10)
t
OSLH
(Note 10)
t
PS
(Note 14)
t
OST
(Note 10)
t
PV
(Note 11)
Pin to Pin Skew
HL Transitions
Pin to Pin Skew
LH Transitions
Duty Cycle
LH–HL Skew
Pin to Pin Skew
LH/HL Transitions
Device to Device Skew
LH/HL Transitions
1.3
1.0
2.0
2.0
2.0
T
A
= −40°C
to
+85°C
V
CC
=
4.5V–5.5V
C
L
=
250 pF
8 Outputs Switching
(Note 13)
Max
2.3
1.8
3.5
3.5
3.5
ns
ns
ns
ns
ns
Units
Note 10:
Skew is defined as the absolute value of the difference between the actual propagation delays for any two separate outputs of the same device.
The specification applies to any outputs switching HIGH-to-LOW (t
OSHL
), LOW
-
to
-
HIGH (t
OSLH
), or any combination switching LOW
-
to
-
HIGH and/or
HIGH
-
to
-
LOW (t
OST
). The specification is guaranteed but not tested.
Note 11:
Propagation delay variation for a given set of conditions (i.e., temperature and V
CC
) from device to device. This specification is guaranteed but not
tested.
Note 12:
This specification is guaranteed but not tested. The limits apply to propagation delays for all paths described switching in phase
(i.e., all LOW-to-HIGH, HIGH-to-LOW, etc.)
Note 13:
These specifications guaranteed but not tested. The limits represent propagation delays with 250 pF load capacitors in place of the 50 pF load
capacitors in the standard AC load.
Note 14:
This describes the difference between the delay of the LOW-to-HIGH and the HIGH-to-LOW transition on the same pin. It is measured across all
the outputs (drivers) on the same chip, the worst (largest delta) number is the guaranteed specification. This specification is guaranteed but not tested.
本帖最后由 Jacktang 于 2021-3-28 21:46 编辑
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