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參數(shù)資料
| 型號： | 7AHCT244PWDH |
| 廠商： | NXP Semiconductors N.V. |
| 英文描述： | Octal buffer/line driver; 3-state |
| 中文描述： | 八路緩沖器/線路驅(qū)動器，3態(tài) |
| 文件頁數(shù)： | 2/16頁 |
| 文件大小： | 80K |
| 代理商： | 7AHCT244PWDH |
1999 Sep 28
2
Philips Semiconductors
Product specification
Octal buffer/line driver; 3-state
74AHC244; 74AHCT244
FEATURES
ESD protection:
HBM EIA/JESD22-A114-A
exceeds 2000 V
MM EIA/JESD22-A115-A
exceeds 200 V
CDM EIA/JESD22-C101
exceeds 1000 V
Balanced propagation delays
All inputs have a Schmitt-trigger
action
Inputsacceptsvoltageshigherthan
V
CC
For AHC only:
operates with CMOS input levels
For AHCT only:
operates with TTL input levels
Specified from
40 to +85 and +125
°
C.
DESCRIPTION
The 74AHC/AHCT244 is a
high-speed Si-gate CMOS device.
The 74AHC/AHCT244 is an octal
non-inverting buffer/line driver with
3-state outputs.
The 3-state outputs are controlled by
the outputs enable inputs 1OE and
2OE.
AHIGHonnOEcausestheoutputsto
assume a high-impedance OFF state.
FUNCTION TABLE
See note 1.
Note
1.
H = HIGH voltage level;
L = LOW voltage level;
X = don’t care;
Z = high-impedance OFF state.
QUICK REFERENCE DATA
GND = 0 V; T
amb
= 25
°
C; t
r
= t
f
≤
3.0 ns.
Notes
1.
C
PD
is used to determine the dynamic power dissipation (P
D
in
μ
W).
P
D
= C
PD
×
V
CC2
×
f
i
+
∑
(C
L
×
V
CC2
×
f
o
) where:
f
i
= input frequency in MHz;
f
o
= output frequency in MHz;
∑
(C
L
×
V
CC2
×
f
o
) = sum of outputs;
C
L
= output load capacitance in pF;
V
CC
= supply voltage in Volts.
The condition is V
I
= GND to V
CC
.
2.
INPUTS
OUTPUT
nOE
nA
n
L
H
X
nY
n
L
H
Z
L
L
H
SYMBOL
PARAMETER
CONDITIONS
TYPICAL
UNIT
AHC
AHCT
t
PHL
/t
PLH
propagation delay
1A
n
to 1Y
n
;
2A
n
to 2Y
n
input capacitance
output capacitance
power dissipation
capacitance
C
L
= 15 pF;
V
CC
= 5 V
3.5
5.0
ns
C
I
C
O
C
PD
V
I
= V
CC
or GND
3.5
4.0
10
3.5
4.0
12
pF
pF
pF
C
L
= 50 pF;
f = 1 MHz;
notes 1 and 2
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| 7AHCT541PWDH | 制造商:PHILIPS 制造商全稱:NXP Semiconductors 功能描述:Octal buffer/line driver; 3-state |
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