參數資料
型號: 7HCT1284D
廠商: NXP SEMICONDUCTORS
元件分類: 通用總線功能
英文描述: Parallel printer interface transceiver/buffer
中文描述: QUAD LINE TRANSCEIVER, PDSO20
封裝: 7.50 MM, PLASTIC, SOL-20
文件頁數: 6/12頁
文件大?。?/td> 138K
代理商: 7HCT1284D
Philips Semiconductors
Product specification
74HCT1284
Parallel printer interface transceiver/buffer
1998 Jul 10
6
TEST CIRCUITS AND WAVEFORM
D.U.T
V
CC
I
O
V
OH
/2
V
OH
is the voltage when 10
μ
A is drawn from the high output.
I
is measured by forcing V
/2 on the output. RD can then
be calculated using the equation RD = |V
OH
/2I
O
| .
SK00007
Figure 1. Output Impedance RD
PULSE
GENERATOR
R
T
V
IN
D.U.T
V
OUT
50pF
V
CC
Test Circuit for B
n
or Y
n
Outputs
SWITCH POSITION
B
n
or Y
n
Outputs
TEST
t
PLH
t
PHL
t
PZH
t
PHZ
t
PZL
t
PLZ
SWITCH
GND
V
CC
GND
GND
V
CC
V
CC
35
S1
GND
V
CC
62
PULSE
GENERATOR
R
T
V
IN
D.U.T
V
OUT
C
L
R
L
V
CC
Test Circuit for A
n
Outputs
V
M
V
M
t
W
AMP (V)
NEGATIVE
PULSE
10%
10%
90%
90%
0V
V
M
V
M
t
W
AMP (V)
POSITIVE
PULSE
90%
90%
10%
10%
0V
t
THL
(t
f
)
t
TLH
(t
r
)
t
THL
(t
f
)
t
TLH
(t
r
)
V
= 1.5V
Input Pulse Definition
DEFINITIONS
R
L
=
C
L
=
Load resistor; see AC CHARACTERISTICS for value.
Load capacitance includes jig and probe capacitance;
see AC CHARACTERISTICS for value.
R
T
=
Termination resistance should be equal to Z
OUT
of
pulse generators.
INPUT PULSE REQUIREMENTS
FAMILY
Amplitude
Rep. Rate
t
W
t
r
t
f
74HCT
3.0V
1MHz
500ns
3ns
3ns
SK00008
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